Grease-trapping systems, energisable controlling assembly, waste-water-pipe-connector therefor, and a method of using a grease-trapping system

Abstract

An automatic grease-trapping system 10 is provided for separating fat, oil and / or grease (FOG) from wastewater, the system includes a grease-trap assembly 12 having a wastewater container 22 for recei

Description

The present invention relates to an automatic system for separating and trapping grease from waste-water. The present invention also relates to a controlling assembly which controls a system for trapping grease. The present invention further relates to a device for connecting a grease-trapping system to a pipe. Additionally, the present invention relates to a method of using the system to separate grease from waste-water. Furthermore, the present invention relates to a method of cleaning an automatic greasetrapping system. In kitchens or other settings which result fat, oil and / or grease being washed away with water, typically down a sink or dishwasher, the waste-water becomes soiled. Fat, oil and grease is often referred to as “FOG” in the industry. Untreated waste-water soiled with FOG is problematic as the FOG congeals and hardens, thereby forming blockages in the sewers and pipework. A solution to remove the FOG before the FOG reaches the sewers is to use a grease trap, also referred to as a grease interceptor. Passive FOG trap passively removes FOG by using baffles and gravity to separate FOG from water. However, when saturated with FOG, the passive FOG trap needs to be cleaned more regularly increasing the number of visits by users who carry out cleaning, such as engineers. Passive grease traps can be cleaned inside the kitchen or removed from site. However, they are large units to allow for grease capture and require several users to carry the unit away from the kitchen due to the weight of the trapped FOG. An alternative solution is to provide a grease trap in the form of a removable grease bag which filters out and captures FOG from waste-water flowing through the bag. However whilst some liquid FOG is captured by the bag, the bag is not typically big enough to retain water for the required time for FOG to separate. FOG enters the drains and restricts water flow. Furthermore, with use, the accumulation of FOG with the removable bag slows or halts the flow of water altogether. Automated FOG traps use a skimming device for skimming FOG off from the surface. Unlike passive grease traps they are smaller in size and so can fit under sinks and still be effective in capturing FOG. They can also handle multiple sinks and dishwashers. However, once installed, automated FOG traps are not designed to be moved for cleaning or relocating to new premises. As such, removal requires moving or cutting waste-water pipes to disconnect the FOG trap from the plumbing and, due to the weight of the FOG trap, several users are required to lift the FOG trap away. Frequently, the automated FOG trap is typically dragged which can cause damage to the floor and injure users. The automated FOG trap also creates an area which cannot be cleaned, adding to hygiene issues. Pressure washing the automated FOG trap in the kitchen would result in encrusted FOG and food debris being dislodged and soiling the surrounding area, which is unhygienic, particularly if food is being prepared. Thus, cleaning an automated FOG trap currently involves manually scrubbing the trap which is unpleasant and malodorous. Manual scrubbing also requires strength and physical effort, thereby increasing the risk of injury and reduce the range of users who can clean the trap. Manual cleaning is timeconsuming, resulting in the FOG trap being out of use for an extended period of time. Manual cleaning may also be less effective, such that the FOG trap may not be clean by the end, particularly in areas difficult or impossible to access. The present invention seeks to provide a solution to these problems. According to a first aspect of the present invention, there is provided an automatic grease-trapping system for separating fat, oil and / or grease from waste-water, the automatic grease-trapping system comprising: a grease-trap assembly having: a wastewater container for receiving waste-water containing fat, oil and / or grease, the wastewater container having: a waste-water inlet, a waste-water outlet, and a grease flow-path between the waste-water inlet and outlet; and a grease-removal apparatus for removing the fat, oil and / or grease from the waste-water; the automatic grease-trapping system further comprising: a removable energisable controlling assembly adapted to control the grease-trap assembly, the controlling assembly being removably connectable to the grease-removal apparatus; and / or a retractable waste-water-pipe-connector on each of the waste-water inlet and a waste-water outlet, each waste-water-pipe-connector being reconfigurable between an extended condition and a retracted condition for enabling the grease-trap assembly to be releasably connectable to plumbing; for allowing disconnection for offsite cleaning of the automatic grease-trapping system or part thereof. All or at least part of the grease-trapping system is removable, such as for ease of offsite maintenance or offsite cleaning of all or parts of the system. For instance, the controlling assembly may be disconnected from the rest of the system and moved to another location, to clean or repair the controlling assembly. For example, if the controlling assembly is faulty, the controlling assembly can be disconnected by the kitchen staff and sent for repairs. This negates the need for an engineer to be dispatched to the site and repair the controlling assembly in situ which can be challenging and can cause hazards with exposed electrical wiring. The controlling assembly can even be replaced instantly with another controlling assembly for customisability and / or to reduce the period of time during which the system is out of action. Removing the controlling assembly may provide increased access to the remaining components of the system, thereby increasing the ease of cleaning of the remaining components. Removal of the controlling assembly may also be beneficial to protect any electronics within the controlling assembly from damage when cleaning the remaining components of the system. Additionally, the electronics within the controlling assembly may be damaged by condensation and FOG exposure. The grease-trapping system can be removed for cleaning by a single user. Cleaning offset may be done by pressure or jetwashing, which may allow for a quicker and / or more effective clean, at least compared to manual cleaning by a user typically on their hands and knees. The welfare of users who carry out cleaning is improved due to the improved access, the ability to move the system, and not having to be in strenuous and uncomfortable positions and exposed to malodorous fumes during cleaning. Faster cleaning is more time efficient and therefore more cost efficient. Offsite cleaning allows for the servicing to take place away from the kitchen, which is more hygienic, less intrusive and / or less malodorous for the kitchen. Removal offsite also means the system does not create an obstruction in the kitchen. Removability also allows for more efficient service plans to include a complete swap of the dirty system or part thereof with an already cleaned system or part thereof, respectively. The connector enables the assembly to be easily connected and disconnected from the plumbing, once again, for offsite cleaning or maintenance. The retractable waste-water-pipe-connector enables removal without having to move or cut any plumbing, due to being retractable so as to no longer cover a plumbing joint. Removability of individual parts means the whole system can be dismantled and removed part by part, by even just one user, instead of requiring two or more users as in the prior art. Logistics are simplified and labour costs may be reduced. Additionally, the controlling assembly may comprise a programmable logic controller. A programmable logic controller may automatically process inputs and / or emit outputs, such as in response to a user, data from a sensor and / or according to a recorded set of instructions. The programmable logic controller may allow the grease-removal apparatus to automatically control the grease-removal apparatus. Preferably, the controlling assembly may further comprise a force-transmission element and a motor. The force-transmission enables the motor to be spaced apart from the grease-removal apparatus by transmitting forces from the motor to the grease-removal apparatus. Furthermore, the force-transmission element may include at least one coupling. A coupling can be easily coupled and / or uncoupled from a complementary part, such as a complementary coupling. If the coupling is a gear, the gear may be an easy mechanism to allow the controlling assembly to be removable connected to another component of the system. Preferably, at least one said waste-water-pipe-connector may have a concertinaed body so as to form bellows. A concertina is a simple mechanism for enabling extension and retraction of the connector whilst also ensuring a fluid-tight seal. Optionally, the waste-water-pipe-connector may further comprise a jubilee clip The jubilee claim may provide or improve a fluid-tight seal Beneficially, the automatic grease-trapping system may further comprise a flow controlling device. Furthermore, the flow controlling device may include a sluice. The flow controlling device may prevent or inhibit flow of waste-water from the plumbing and / or from the inlet and / or outlet when the system is disconnected from the plumbing. Advantageously, the automatic grease-trapping system may further comprise a baffle. Beneficially, the baffle may have an in-use top region and the baffle may define a flow channel, the flow channel being spaced-apart from the in-use top region such that the flow channel may be in-use below any fat, oil and / or grease floating at a surface of the waste-water. A baffle may have several functions in the grease-trapping system. A first function of a baffle may be to prevent or inhibit any fat, oil and / or grease floating at a surface of the waste-water from reaching the outlet, thereby trapping FOG in the system. A second function of a baffle may be to slow the flow of waste-water, such as by redirecting the flow. Slower flow reduces or eliminates turbulence. Mixing of FOG floating on the surface with water may reduce the efficiency of FOG removal. As turbulence increases mixing, turbulence is undesirable. Preferably, the waste-water container may further include a baffle-positioner. The bafflepositioner may position the baffle. Optionally, the baffle may be removably connectable to the system or part thereof. A removable baffle may be easier to clean, particularly offsite. Removal of the baffle may also facilitate cleaning of the waste-water container. Optionally, the baffle-positioner may include a rail with which the baffle may be engageable. Insertion and / or removal of a baffle into and / or from a rail may be easy. A rail may be easy to manufacture, such as by forming a groove in a wall of the wastewater container. No additional parts are required, which may be particularly beneficial as additional parts would be submerged continuously during use and subjected to waste flow, both of which may cause damage and / or rust. A rail may also be easy to clean. Advantageously, the automatic grease-trapping system may further comprise a heating element. The heating element warms the waste-water to a certain temperature resulting in solid FOG becoming liquid. Thus, the heating element liquifies congealed or solid FOG. The liquid FOG thereby forms a layer which floats at the surface of the waste-water and adheres to the grease-removal apparatus. The heating element may be embedded in the waste-water container or tank, with an IP rated connector which can be connected to any controlling assembly, to heat the fluid which makes cleaning the system easier. Colder conditions can make cleaning a lot harder as the FOG will solidify. Furthermore, the grease-removal apparatus may include a skimming element. The skimming element, skims off the liquid layer of FOG floating at the surface of the waste-water. In the preferred embodiment, the skimming element is preferably a skimming-wheel intersecting the layer of liquid FOG. The viscosity of the liquid FOG causes the liquid FOG to adhere to the rotating wheel. Due to the hydrophobicity and relative position of the FOG on top of the waste-water, the portion of the rotating wheel which exits from the layer of liquid FOG only or substantially only carries FOG, as opposed to FOG and water. As no water is removed by the grease-removal apparatus, the efficiency of FOG removal is increased. Additionally, the grease-removal apparatus may include a wiper element. The wiper element wipes or scrapes of the FOG adhered to the grease-removal apparatus, which is preferably a wheel. Preferably, the automatic grease-trapping system may further comprise a storage container for storing the fat, oil and / or grease removed from the waste-water by the grease-removal apparatus. The storage container enables storage of the removed FOG. Preferably, the storage container is removably connectable to the grease-trap assembly. When full, the storage container can be disconnected and removed, for example to be emptied elsewhere. Beneficially, the automatic grease-trapping system may further comprise a wheel element at or adjacent a base of the waste-water container for engaging a ground surface and enabling the waste-water container to be movable relative thereto. There is no need to lift the automatic grease-trapping system or waste-water container thereof, although this alternative may be envisioned. Instead, the wheel element enables a user to wheel the system or at least the waste-water container thereof away, thereby facilitating removal. Optionally, the wheel element may include a castor wheel and / or a foot. A castor wheel is easy to source. Additionally, a castor wheel may be undriven and / or free to pivot around a vertical axis to accommodate any direction of movement of the waste-water container. The foot may prevent or inhibit accidental movement of the system. The foot may enable the system to be lifted and / or lowered to a desirable height. Advantageously, the automatic grease-trapping system may further comprise a handle. A handle is ergonomic and facilitates moving the grease-trapping system. Preferably, the automatic grease-trapping system may further comprise a filter. The filter provides a barrier for solids, such as food debris or coagulated FOG. Optionally, the filter may be removable. Emptying and / or cleaning the filter is easier. According to a second aspect of the present invention, there is provided an energisable controlling assembly for controlling a grease-trap assembly of an automatic greasetrapping system as claimed in any one of the preceding claims, the controlling assembly being removably connectable via connection means to the grease-trap assembly. The controlling assembly can be removed for cleaning, maintenance or be replaced with another controlling assembly for customisability. According to a third aspect of the present invention, there is provided a retractable waste-water-pipe-connector for connecting the waste-water container of a grease-trapping system to plumbing, wherein the waste-water-pipe-connector is reconfigurable between an extended condition and a retracted condition for enabling the grease-trap assembly to be releasably connectable to plumbing when the retractable waste-water-pipe-connector is in the retracted condition. The waste-water-pipe-connector can be reconfigured to provide a fluid-tight seal when required or enable the grease-trap assembly to be easily disconnected from the plumbing, without needing to cut or move any pipes. According to a fourth aspect of the present invention, there is provided a passive greasetrapping system for separating fat, oil and / or grease from waste-water, the passive grease-trapping system comprising: a grease-trap assembly having: a waste-water container for receiving waste-water containing fat, oil and / or grease, the waste-water container having: a waste-water inlet, a waste-water outlet, and a grease flow-path between the waste-water inlet and outlet; and a retractable waste-water-pipe-connector on each of the waste-water inlet and a waste-water outlet, each waste-water-pipe-connector being reconfigurable between an extended condition and a retracted condition for enabling the grease-trap assembly to be releasably connectable to plumbing; for allowing disconnection for offsite cleaning of the passive grease-trapping system. The system or machine can be a passive grease trap without skimming attachments The removal of the controlling assembly and / or of a baffle from the waste water container can increase the volume of fluid treated by the system, thereby negating the need to purchase a bigger grease trap at increased cost. The grease-trapping system is designed to be easily disconnected to be cleaned or serviced offsite. By being a passive grease-trapping system, no electricity is required for the system to function, which is environmentally friendly, and the system is cheaper to run. No electronics which would need to be insulated from the waste-water and / or FOG, are required. Manufacture, assembly, and / or use are simplified and costs are reduced. The risk of accidental electrocution is also reduced. According to a fifth aspect of the present invention, there is provided a method of using a grease-trapping system for separating fat, oil and / or grease from waste-water, the method comprising the steps of: a] providing a grease-trapping system, preferably in accordance with the first and / or the fourth aspects of the invention; and b] when wastewater is received within the waste-water container, the grease-trapping system removes the fat, oil and / or grease from the waste-water. The method of use improves the cleanliness of the waste-water by removing FOG. The removal of FOG may be passive or active. In the case of active FOG removal, the system can also handle larger volumes of grease and / or be used in conjunction with larger sink attachments due to the automated skimming of grease which otherwise a passive grease trap could not handle without being an unachievable size for the kitchen. According to a sixth aspect of the present invention, there is provided a method of cleaning a grease-trapping system, the method comprising the step of: cleaning at least part of the grease-trapping system, preferably in accordance with the first and / or fourth aspects of the invention. Part of the system, such as the controlling assembly, or the whole of the system may be cleaned. Beneficially, at least part of the grease-trapping system may be moved offsite prior to cleaning. Cleaning of the system can be carried off the premises such as outside of the kitchen. Cleaning may happen in a location, such as a warehouse, equipped with dedicated cleaning equipment. Optionally, a dirty grease-trapping system or any part thereof may be replaced with a further, clean grease-trapping system or part thereof. The ability to rapidly replace a dirty grease-trapping system or part thereof with a clean grease-trapping system or corresponding part before the dirty grease-trapping system is cleaned reduces the period of time during which the system is unavailable to trap any FOG. Preferably, cleaning may include pressure-washing. The application of a cleaning fluid at a high pressure results in a cleaner and more hygienic system, at least compared with manual cleaning. High-pressure washing may also be faster than manual cleaning. The invention will now be more particularly described, by way of example only, with reference to the accompanying drawings, in which: Figure 1 shows a partially exploded front perspective representation of an embodiment of a grease-trapping system in accordance with the first aspect of the invention; Figure 2 is a rear perspective representation of the grease-trapping system of Figure 1; Figure 3 shows a front perspective representation of the grease-trapping system of Figure 1, with a lid omitted for clarity, in-use, connected to plumbing; Figure 4 illustrates a side perspective representation of the grease-trapping system of Figure 1, with part of the automatic grease-trapping system omitted for clarity; Figure 5 illustrates a controlling assembly of the grease-trapping system of Figure 1, in a disassembled condition; Figure 6 is a close-up perspective representation from below of part of the controlling assembly of Figure 1; Figure 7 illustrates a close-up perspective representation from above of part of the grease-trap assembly, in-use, prior to engagement of the controlling assembly of Figure 6; Figure 8 is a close-up exploded front perspective of part of the grease-trapping system of Figure 1; Figure 9 shows a close-up partly exploded perspective representation of the grease-trapping system of Figure 1, showing part of a lid removed and a filter partly removed from the grease-trapping system ; Figure 10 illustrates a front perspective representation of the grease-trapping system of Figure 1, in-use, during assembly; Figure 11 is a flow-diagram of a method of use of the grease-trapping system of Figure 1; and Figure 12 is a flow-diagram of a method of cleaning the grease-trapping system of Figure 1. Referring to Figure 1, there is shown a system indicated generally at 10. A rearview of the system 10 is illustrated in Figure 2. The system 10 in-use separates one or more of: fat, oil, and grease, collectively referred to as FOG, from waste-water. Optionally, the FOG may be trapped or stored by the system 10. As such, FOG may be recovered from waste-water. The system 10 may be referred to as a grease-trapping system, greasetrapping unit, a grease recovery unit, a grease removal unit, a grease separation system, or a grease trap. The system 10 may remove FOG passively. Alternatively, the system 10 may remove FOG actively, such as by virtue of being at least partly automated. The system 10 may also be able to remove solids, such as food debris, from the waste-water. Preferably, the system 10 is detachable from the surrounding plumbing. This enables the system 10 to be serviced using specialist equipment away from the kitchen, whereas in the prior art, current methods of cleaning have to be carried out in the kitchen. For clarity, waste-water devoid or substantially devoid of FOG may be referred to as “clean” or “cleaned” waste-water. In contrast, waste-water entering the system 10 may be considered as “dirty” or “unclean” waste-water. It is understood that clean waste-water may still be non-potable or dirty according to other metrics. The term “clean” or “cleaned” is used to distinguish waste-water with a low or no FOG content, from waste-water having a comparatively high FOG content. The system 10 or any part thereof may be at least partly formed of any of: metal, plastics, wood, carbon fibre, glass fibre, glass, fabric, any other suitable material, and any combination thereof. The term “metal” includes alloys. The term “plastics” includes elastomeric materials, such as rubber or silicone. The system 10 includes a grease-trap assembly 12, a controlling assembly 14, a waste-water-pipe-connector 16, a storage container 18, and a filter 20, but any of the above may be omitted and / or a plurality of any of the above may be provided. The grease-trap assembly 12 in-use processes dirty waste-water containing FOG into cleaned waste water. The grease-trap assembly 12 includes a waste-water container 22, a grease-removal apparatus 24, a flow controlling device 26, a baffle 28, a bafflepositioner 30, awheel element 32, and a handle 34, but any of the above may be omitted and / or a plurality of any of the above may be provided. The waste-water container 22 in-use receives waste-water containing FOG. The wastewater container 22 includes a waste-water inlet 36a, a waste-water outlet 36b but either of the above may be omitted and / or a plurality of either may be provided. The wastewater container 22 also defines a grease flow-path and a water flow-path. The wastewater container 22 preferably has a base 38a and at least one side wall 38b. As shown, the waste-water container 22 has four side walls 38b. The wall or walls 38b define a top opening. Optionally, the waste-water container 22 may comprise a lid 40. Any or all parts of the waste-water container 22 may be formed of plastics and / or metal, but any nonplastics and non-metal may be envisioned. More preferably, the metal is steel, and even more preferably stainless steel. Optionally, the waste-water container 22, and / or a wall thereof may have one or more inner and outer skins. For example, an outer skin may be formed of metal, such as steel, and more preferably steel, whilst an inner skin may be formed of plastics. However, one of the skins may just as easily be omitted. This may beneficially reduce weight and materials required during manufacture. Manufacture may be simplified and / or cheaper. For instance, the waste-water container 22 may only have a single skin, formed of plastics. The lid 40 in-use provides a barrier to close, and more preferably seal the top opening. Beneficially, the lid 40 may thereby in-use prevent or inhibit malodorous or noxious fumes and / or contents of the waste-water container 22 from exiting the waste-water container 22 through the top opening. The lid 40 may also in-use prevent or inhibit user access to the volume of the waste-water container 22 and any part of the system 10 within the waste-water container 22. Thus, the lid 40 may beneficially increase the safety of the system 10, such as by preventing or inhibiting user access to moving parts and / or electrical parts within the waste-water container 22. A further function of the lid 40 may be to provide a support and / or an interface for components of the system 10, such as the grease-removal apparatus 24 and / or controlling assembly 14. The lid 40 includes a panel element 42a, a lid-attachment means 42b, sealing means, a ventilation-chamber 42c, a wiper housing 42d, an access flap 42e, an aperture 42f, a plug-receiving storage cavity 42g, but any of the above may be omitted and / or a plurality of any of the above may be provided. The panel element 42a includes at least one, and preferably three sub-panels. The subpanels cooperate together to form the panel element 42a. The lid-attachment means 42b, also referred to as a lid connector, in-use secures the panel element 42a to the waste-water container 22.In the illustrated embodiment, the lidattachment means 42b includes at least one and preferably a plurality of latches or clips. The sealing means, also referred to as a seal, in-use enables or improves a seal to be formed between the panel element 42a and the waste-water container 22. Thus, the sealing means prevents or inhibits fluid and / or malodorous fumes from escaping the grease-trap assembly 12. The sealing means may remain attached to one or both of the panel element 42a and the waste-water container 22, but connectably removable to one or both may be envisioned. The sealing means may comprise a plastics material, such as an elastomer. The elastomer may be rubber or silicone by way of examples only. The ventilation-chamber 42c in-use enables ventilation. In other words, the ventilationchamber 42c enables air into and / or out of the system 10. Preferably, the ventilationchamber 42c may have air-purification means or purifier, not shown. The purifier purifies any air entering and / or exiting the system 10. The purifier may capture airborne particulates and / or neutralise odours. The ventilation-chamber 42c may include a carbon filter. The wiper housing 42d in-use houses part of the grease-removal apparatus 24, and more preferably a wiper element thereof. The access flap 42e provides access when required to the grease-removal apparatus 24 without needing to remove the lid 40. The access flap 42e is preferably hingeably connected, directly or indirectly to the panel element 42a. In the illustrated embodiment, the access flap 42e is associated with the wiper housing 42d but this is optional, for instance, if a wiper housing is omitted altogether. The aperture 42f provides a through-bore. In the illustrated embodiment, there is a plurality of apertures 42f. A first said aperture 42f enables an external controlling assembly 14 to transmit a force and / or a command to a component within the wastewater container 22. It is understood that the or a said aperture 42f may be obstructed or filled with another component. This may beneficially prevent or inhibit waste-water, FOG and fumes from accidentally exiting the waste-water container 22 through the aperture 42f, such as when the controlling assembly 14 is removed. Optionally a further said aperture 42f may be associated with a ventilation-chamber 42c. The plug-receiving storage cavity 42g provides a space or volume in, on, at, or associated with the panel element 42a. The grease flow-path is the path along which FOG moves. The grease flow-path extends at least between the waste-water inlet 36a and the waste-water outlet 36b. Preferably, the grease flow-path also extends upstream of the waste-water inlet 36a. The grease flow-path terminates in the storage container 18, if a storage container 18 is provided. Preferably, the grease flow-path does not extend beyond the waste-water outlet 36b. The water flow-path is the path along which water moves. The water flow-path extends at least between the waste-water inlet 36a and the waste-water outlet 36b. Preferably, the water flow-path also extends upstream of the waste-water inlet 36a. Unlike the grease flow-path, the water flow-path preferably also extends downstream beyond the waste-water outlet 36b. Thus, there is preferably an overlap between the grease flowpath and the water flow-path, at least upstream of the waste-water outlet 36b. Furthermore, the grease flow-path and the water flow-path preferably diverge from the waste-water outlet 36b such that there is preferably no overlap from the waste-water outlet 36b and downstream thereof. Parts of the grease-trap assembly 12, such as the flow controlling device 26 and / or a baffle 28 can define, determine or affect the water flow-path and / or grease flow-path, for example by selectively blocking a said flow-path to prevent or inhibit flow of water and / or FOG therealong, and / or by redirecting the flow. The grease-removal apparatus 24 in-use removes FOG from the waste-water. The grease-removal apparatus 24 includes a skimming element 44, a FOG remover 46, a grease conduit 48, and a heating element 50, but any of the above may be omitted and / or a plurality of any of the above may be provided. The grease-removal apparatus 24 is separate or separable from the controlling assembly 14. Thus, the controlling assembly 14 can be disengaged or disconnected from the grease-removal apparatus 24. Conversely, the controlling assembly 14 can be connected, preferably removably connected to the grease-removal apparatus 24. The skimming element 44 in-use separates FOG from waste-water by skimming the FOG off. In the illustrated embodiment, the skimming element 44 includes a support frame 52 and a skimming-wheel 54, but any of the above may be omitted and / or a plurality of any of the above may be provided. The support frame 52 in-use supports the skimming-wheel 54. Optionally, the support frame 52 may also have a mechanism or element to transmit the driving force from the controlling assembly 14 to the skimming-wheel 54, such as a belt, coupling, gear or gear system interacting with the skimming-wheel axle 54a. The skimming-wheel 54 in-use lifts FOG from the surface of the waste-water. The skimming-wheel 54 preferably extends in a plane. The plane is preferably perpendicular or substantially perpendicular to the surface of the waste-water, but a non-right angle may be envisioned. Thus, the plane is preferably in-use vertical or substantially vertical. The skimming-wheel 54 has two wheel side surfaces, a perimetric surface or rim, and an axle 54a but any of the above may be omitted and / or a plurality of any of the above may be provided. The perimetric surface is preferably continuous, but discontinuous may be considered. A continuous surface may beneficially prevent or inhibit entry of water or FOG into the skimming-wheel 54. The FOG remover 46 in-use removes from the skimming-wheel 54 and / or the skimming element 44 any FOG adhering thereto. The FOG remover 46 is positioned, arranged or configured so that FOG removed from the skimming element 44 moves towards the grease conduit 48 and / or into the storage container 18 if either or both are provided. Preferably, the FOG remover 46 includes at least one wiper element 56. Thus, the FOG remover 46 removes FOG from the skimming-wheel 54 by wiping or scraping off FOG. As shown in Figures 3 and 4, the FOG remover 46 includes two wiper elements 56. The wiper elements 56 are preferably positioned on either side the skimming-wheel 54. This beneficially allows FOG to be removed from both wheel side surfaces simultaneously, leading to greater efficiency of FOG removal. The grease conduit 48 in-use provides a channel or conduit for FOG removed by the skimming element 44. In the first embodiment, the storage container 18, if provided, is connected or connectable to the grease conduit 48. It may be envisioned however, that no storage container may be provided. The grease conduit may instead provide a conduit for liquid FOG to flow offsite, such to a processing unit. Optionally, the grease conduit 48 may also include a catching channel 58. The catching channel 58 in-use catches FOG from the skimming element 44. There may be a catching channel 58 associated with each skimming element 44. In the illustrated embodiment, there are two catching channels 58. The heating element 50 in-use emits heat to increase the dirty waste-water temperature to cause solid FOG to become liquid FOG. The heating element 50 includes a heatemitting portion, a temperature sensor, a security cutout element, a protective sleeve, and at least one of: a plug 60a and a socket 60b, but any of the above may be omitted and / or a plurality of either of the above may be provided. The temperature sensor may be a thermostat. The temperature sensor senses the temperature of the heat-emitting portion and / or of the waste-water. This enables the system 10 to monitor the temperature. Optionally, the system 10 may be able to automatically control the heat output of the heat-emitting portion in response to an output from the temperature sensor. For example, when the waste-water, and thus FOG, reaches a desired, predetermined temperature, the system 10 may be able to automatically stop the heat-emitting portion from emitting heat, which saves energy and is environmentally friendly. Safety may also be increased as overheating FOG could increase the risk of FOG igniting and thus, a fire. Conversely, if the waste-water temperature drops beneath a predetermined temperature, the system 10 may be able to automatically control the heat-emitting portion to emit heat or increase the heat output. The security cutout element may improve the safety of the system 10. More preferably, the security cutout element may be a thermal cutout which stops the heating element 50, or at least stops the heat-emitting portion from emitting heat. This automatic cutout or shutdown may be beneficial for instance, if a fault is detected. The protective sleeve in-use provides a barrier or shield between at least part of the heating element 50 or at least part of the heat-emitting portion thereof, and the wastewater. Beneficially, at least part of the heating element 50 or any electronics thereof are shielded from the water. In the first embodiment, the protective sleeve is beneficially a tubular portion. The protective sleeve may include a thermally conductive material, such as metal, or a non-thermally conductive material. Any or all of: the heat-emitting portion, the temperature sensor, and the security cutout element may be, full or partially, received within the protective sleeve. The heating eiement 50 or at least part thereof, such as any or any combination of the heat-emitting portion, the temperature sensor, security cutout element and / or protective sleeve may be embedded into the waste-water container 22. The plug 60a and / or socket 60b is preferably an Ingress Protection (IP)-rated plug 60a and socket 60b. More preferably the IP-rated plug 60a and socket 60b are water proof or water tight. Beneficially, this allows the heating element 50 to have a secure and water tight connection with a source of power, such as the mains electricity. A plug 60a and socket 60b also provides the ability to be to be disconnected by unplugging. The plug 60a is associated with the heating element 50 and the socket 60b with the controlling assembly 14 but the opposite arrangement may be considered. In an alternative embodiment, the socket may even be associated with a power source directly, such as mains electricity. The plug 60a can be stored within the plug-receiving storage cavity 42g. Storage within the plug-receiving storage cavity may prevent or inhibit access and / or damage to the plug 60a and any associated cable, such as during cleaning or moving. If provided, the controlling assembly 14 in-use is adapted or configured to control the grease-trap assembly 12, or any part thereof. Figures 5 to 7 illustrate the controlling assembly 14 in more detail. More preferably, the controlling assembly 14 in-use controls the grease-removal apparatus 24. The controlling assembly 14 is preferably at least electrically-energisable. It is understood that, in a passive grease-trapping system, the controlling assembly, or at least an energisable controlling assembly, may be omitted. The controlling assembly 14 preferably has a connection to a power source. The controlling assembly 14 is preferably removably connectable to the grease-trap assembly 12, but non-removable may be considered. Beneficially, removability allows disconnection for offsite cleaning of the system 10 or at least of the controlling assembly 14. The controlling assembly 14 is preferably removably connectable to the grease removal apparatus 24 and / or any part thereof, such as the heating element 50, the skimming element 44, the FOG remover 46, and / or the grease conduit 48 thereof. The controlling assembly 14 has a housing 62, a user interface 64, connection means 66, a motor 68, a connection to a power source 70, a force-transmission element 72, a sensor, and a programmable logic controller 74, but any of the above may be omitted and / or a plurality of any of the above may be provided. Although in the present embodiment, the controlling assembly does not include the power source, this alternative may easily be envisioned. The power source could be a battery, electric mains, or a generator, by way of examples only. The power source may be internal or external. There may be more than one power source. The power sources may be of different types. The housing 62 in-use provides a protective shell for receiving at least part of one or more of the other components of the controlling assembly 14 within. The housing 62 preferably prevents or inhibits waste-water ingress and / or damage to internal components. The housing 62 may also facilitate removal and transport of components of the controlling assembly 14 received within, as a user can remove and carry the housing 62 with one or more internal components within. Preferably, the controlling assembly 14 is in the form of a head unit. In other words, the controlling assembly 14, and more preferably, the head unit provides the logic and power source of the system 10. The head unit is beneficially easily detached from and / or reconnected with the rest of the system 10, such as the waste-water container 22 thereof. The user interface 64 in-use enables an input to be provided by a user and / or an output to be provided to the user. The user interface 64 may be digital and / or analogue. Here, the user interface 64 includes at least one input element and / or at least one output element, but any of the above may be omitted and / or a plurality of any of the above may be provided. The input element may include a button. The button may be an on / off power button. The button may be a test / reset / mode button. The output element may be a lightemitting element such as an LED. There may be a plurality of LEDs. A said LED may indicate whether the power is on or off. A said LED may indicate whether the heating element 50 is activated or disactivated. A said LED may indicate whether the skimming element 44 is activated or disactivated. Any other functions or information may be conveyed to and / or by the user interface 64. Removability of the controlling assembly 14 is enabled via connection means 66. The connection means 66 may also be referred to as a head connector or connectors. In other words, the connection means 66 enable the controlling assembly 14 or part thereof, to be connectable, and more preferably removably connectable to the grease-trap assembly 12. Optionally, the system 10 may also comprise locking means or locking elements 76. The locking means 76 and the connection means 66 may be one and the same. Alternatively, the locking means 76 and the connection means 66 may be distinct elements. The locking means 76 may prevent or inhibit accidental disengagement of the controlling assembly 14 from the grease-trap assembly 12. Here the connection means 66 and / or locking means 76 includes complementary connection elements such as male and female elements. The controlling assembly 14 may have a connection element, here a male connection element. The grease-trap assembly 12 may have the complementary connection element, here a female connection element. The locking means 76 may include complementary locking tabs. Any suitable alternative or additional connections means may be envisioned, such as bayonet or bayonet-like arrangement, screw threads, interference fit, or tapers, by way of examples only. Thus, the head unit may be screwed on to secure the heat to the grease-removal apparatus 24. The motor 68 in-use provides a driving force to drive the grease-rem ova I apparatus 24, and more preferably the skimming element 44 thereof. The motor 68 is preferably a rotary motor. The motor 68 may be an electric motor. Beneficially, an electric motor may be quiet, or at least quieter than a combustion engine. An electric motor does not normally emit fumes, which is beneficial if the system 10 is typically located indoors, such as in a kitchen. The connection to a power source 70 in-use enables at least part of the controlling assembly 14, such as the programmable logic controller 74, and / or the motor 68 thereof, to be energised. The connection to a power source 70 may be a conduit, electrical cable, wire, or circuit board trace, by way of examples. The force-transmission element 72 in-use enables a driving force of the motor 68 to be transmitted to the grease-removal apparatus 24. The force-transmission element 72 provides greater flexibility in the positioning of the controlling assembly 14 and / or the motor 68 thereof, relative to the grease-removal apparatus 24. The force-transmission element 72 enables the controlling assembly 14 to be positioned or positionable anywhere relative to the grease-trap assembly 12, such as in, on, at a side, below, or behind the waste-water container 22 or even spaced apart from the waste-water container 22, by way of examples. This flexibility of configuration may enable the system 10 to be used in a greater range of settings. The force-transmission element 72 can engage, directly or indirectly, the skimming wheel axle 54a for rotating the skimmingwheel 54 in-use. The force-transmission element 72 preferably includes at least one and preferably a plurality of couplings. A coupling may be a gear, teeth, such as screw teeth and complementary female screw. Preferably, the couplings can be easily connected and / or disconnected from each other, preferably toollessly. This beneficially allows the head unit to be easily removed and / or easily reconnected, and once reconnected, drive the grease-removal apparatus 24. The sensor in-use senses a parameter. Preferably, the sensor is an electrical current sensor. The electrical current sensor provides feedback to ensure one or preferably both of the motor 68 and heating element 50 are working correctly. If one of the motor 68 and heating element 50 is non-functional, the other will be compromised and therefore requiring replacement or no skimming may take place. The programmable logic controller 74 in-use processes inputs and / or emits outputs. The programmable logic controller 74 preferably includes a printed circuit board (PCB). The programmable logic controller 74 may allow the controlling assembly 14 to automatically control the grease-removal apparatus 24. The output may be in in response to an input. By way of examples only, the input may be any of: an input or command provided by a user, data from a sensor, and a recorded set of instructions or programme. The output may be a software command, by way of example. The waste-water-pipe-connector 16 in-use enables the system 10 or at least the wastewater container 22 thereof to be connected or connectable to plumbing. The waste-water-pipe-connector 16 is reconfigurable between a connecting condition and a nonconnecting condition. In the connecting condition, also referred to as a sealing condition, the waste-water-pipe-connector 16 connects the waste-water container 22 to the plumbing for enabling wastewater to flow between the plumbing and the waste-water container 22. In the non-connecting condition, the waste-water container 22 and the plumbing are releasably connectable or disconnected from each other. No fluid-tight seal is formed around the join of the plumbing and the waste-water container 22 when the waste-water-pipe-connector 16 is in a non-connecting condition. Disconnection enables displacement and more preferably removability of at least part of the grease-trapping system 10, such as for offsite cleaning of the passive grease-trapping system. A waste-water-pipe-connector 16 may associated with the waste-water inlet 36a. Additionally or alternatively, a waste-water-pipe-connector 16 may be associated with the waste-water outlet 36b. Preferably, the system 10 includes a plurality of waste-water-pipe-connectors 16 but any number may be considered, such as one, two or at least three. In the illustrated embodiment, the system 10 preferably has two waste-water-pipe-connectors 16. However, if there were a plurality of waste-water inlets and / or a plurality of waste-water outlets, the system may have more than two waste-water-pipe-connectors. For instance, a waste-water-pipe-connector may be associated with each waste-water inlet and / or with each waste-water outlet. Even if the system 10 has only one retractable waste-water-pipe-connector 16, this may still be beneficial as one of the waste-water inlet and or waste-water outlet may be easily disconnected from the plumbing without needing to cut or move the corresponding waste-water pipe. The system 10 can be pivoted around the remaining joint with the plumbing whilst continuing to be attached by the other of: the waste-water inlet and waste-water outlet. Moving the system 10 away from a wall and / or from under a worktop may still provide greater access, such as for cleaning. In any case, the or at least one waste-water-pipe-connector 16 is preferably at or adjacent the grease-trap assembly 12. More preferably, the or at least one waste-water-pipe-connector 16 remains associated or connected to one of: the plumbing and the grease-trap assembly 12, at least when the waste-water-pipe-connector 16 is in the nonconnecting condition and preferably both in the connecting condition and the nonconnecting condition. In the illustrated embodiment, the or at least one waste-water-pipe-connector 16 is preferably associated with or on the grease-trap assembly 12. As such, the or at least one waste-water-pipe-connector 16 may be moved offsite automatically when the system 10 or grease-trap assembly 12 thereof is moved offsite. However, the opposite arrangement may be envisioned. For example, the or at least one waste-water-pipe-connector may remain associated or connected to the plumbing when in the waste-water-pipe-connector is in the retracted condition. The waste-water-pipe-connector may even be disconnected from both the grease-trap assembly 12 and the plumbing. In the specific embodiment, the or at least one said waste-water-pipe-connector 16 has a concertinaed body and a clip, but any of the above may be omitted and / or a plurality of any of the above may be provided. A concertina structure is easy to deform so as to be reconfigured from the connecting condition to the non-connecting condition and / or vice-versa, by extension or retraction, respectively. Thus, the waste-water-pipe-connector 16 is preferably retractable. In other words, the waste-water-pipe-connector 16 is reconfigurable between an extended condition and a retracted condition. A concertina body may be said to form a bellow or bellows. The waste-water-pipe-connector 16 is preferably formed at least in part of an elastomeric material, such as rubber or silicone. An elastomeric material may beneficially be deformable. An elastomeric material is typically also fluid tight or fluid proof, such that beneficially, a fluid-tight seal may be formed. The waste-water-pipe-connector 16 is preferably hard wearing enough for waste-water. The clip, not shown, is preferably a winged jubilee clip, but any suitable alternative clip may be considered. The flow controlling device 26 in-use provides control over the flow of fluid along the grease flow-path and / or the water flow-path. The flow controlling device 26 may be used to prevent and / or enable flow along the flow-paths. The flow controlling device 26 may take any suitable form, such as a valve, bung or stopper by way of examples. In the illustrated embodiment, the flow controlling device 26 includes a sluice, sluice valve or slide valve 78. The sluice 78 may have a barrier portion 78a and a sluice-handle 78b but the sluice-handle may be omitted and / or a plurality of sluice-handles may be provided. The barrier portion 78a may be referred to as a sluice gate, for clarity. The flow controlling device 26 is movable between an open condition and a closed condition. In the Figures, the system 10 has a plurality of flow controlling devices 26. A flow controlling device 26 is associated with the waste-water inlet 36a. Alternatively, or additionally, a flow controlling device 26 is associated with the waste-water outlet 36b. The or each flow controlling device 26 may beneficially prevent or inhibit fluid flow through the waste-water inlet 36a and / or waste-water outlet 36b, such as when the system 10 is disconnected from the plumbing. Similarly to the waste-water-pipe-connector 16, the or at least one flow controlling device 26 is preferably associated with the grease-trap assembly 12. Thus, when the greasetrap assembly 12 is moved offsite, the or at least one flow controlling device 26 associated therewith is also moved offsite. However, it may easily be envisioned that a flow controlling device may alternatively or additionally be associated with the plumbing. The baffle 28 in-use defines, determines or affects the water flow-path and / or grease flow-path. The baffle 28 may also be referred to as a baffle wall. For example, the baffle 28 may selectably block a said flow-path to prevent or inhibit flow of water and / or FOG therealong. A baffle 28 may also redirect flow. The or each flow path may thus be tortuous. Redirecting the flow may beneficially slow down fluid flow. As a result of slower flow, turbulence may be decreased. Lower turbulence may increase the efficiency of FOG removal. The baffle 28 is positioned or located within the waste-water container 22. The baffle 28 is preferably removably insertable within the waste-water container 22. Preferably, the baffle 28 is engageable with the baffle-positioner 30. If at least one baffle 28 is provided, the baffle 28 is preferably downstream of the greaseremoval apparatus 24 along the water flow-path. The baffle 28 may ensure that the grease flow-path does not extend through and / or beyond the waste-water outlet 36b. The baffle 28 aids in trapping the FOG. The baffle 28 may optionally be referred to as a downstream baffle 28a, for clarity. Preferably, in the shown embodiment, the system 10 has a plurality of baffles 28. A, notionally second, baffle 28 may be provided upstream of the grease-removal apparatus 24 along the water flow-path and / or grease flow-path. Preferably, the second baffle 28 is downstream of the waste-water inlet 36a. The second baffle 28 redirects fluid flow, such as incoming dirty waste-water. The second baffle 28 may be referred to as an upstream baffle 28b for clarity. Preferably the, each, or at least one baffle 28 is or is substantially rectangular in side view, front view, cross-sectional view, but non rectangular in one or more of the above views may be envisioned. The, each, or at least one baffle 28 preferably has a first region 80a, a second region 80b and two side regions 80c. The second region 80b is opposite the first region 80a. Each of the first region 80a, the second region 80b and two side regions 80c may terminate at a first edge or first face, second edge or second face, and side edges or side faces, respectively. The, each or at least one baffle 28 further includes a first major surface 82a and a second major surface 82b. In-use the second region 80b is generally at or adjacent to a base 38a of the waste-water container 22. Correspondingly, the first region 80a is generally away from a base of the waste-water container 22. Thus, the first region 80a may be referred to as an in-use top region. The or at least one said baffle 28 preferably further defines a flow channel 84. The flow channel 84 is spaced-apart from the first region 80a. Thus, the flow channel is in-use below a surface of the waste-water. The flow channel 84 may be formed in any suitable way, for example in the form of one or more through bores extending from the first major surface, through the thickness of the baffle to the second major surface, or a recess extending inwardly from an edge. Preferably in the illustrated embodiment, a baffle 28 defines the flow channel 84 together with the waste-water container 22. More preferably, the second region 80b of the baffle 28 is spaced-apart from the base 38a of the wastewater container 22. This forms a gap through which waste-water may flow. The gap is considered to be the flow channel 84. This is most clearly shown in Figure 8. Optionally, the baffle 28 or baffles 28 may partition the waste-water container 22 into two or more flow chambers. The sum of the volumes of the flow chambers preferably equals the total volume of the waste-water container 22. The flow chamber where FOG removal occurs, such as by the grease-removal apparatus 24, may be referred to as a main chamber or FOG-trapping chamber. If an upstream baffle 28 is provided, an upstream or entry chamber may be defined. If a downstream baffle 28 is provided, a downstream or exit chamber may be defined. Optionally, for clarity, the sub-panels may be referred to as an entry or food sub-panel, a central sub-panel, and an exit or clear water subpanel, in reference to the underlying chambers. However, omission of the upstream baffle 28 may be beneficial, for example to increase the size of the FOG-trapping chamber so that a greater volume of dirty waste-water may be treated. The same system 10 being able to treat a greater volume beneficially avoids the need to obtain a bigger system 10, for example to process waste-water from a greater number of sources and / or a greater volume of dirty waste-water from a source, such as a sink. The upstream baffle 28 can be removed permanently or on demand, as required. Omission of a baffle 28 additionally reduces manufacturing costs and / or allows for kitchens to upscale without the need to buy another system 10. If the baffle 28 is removable, the user can select the number and position of the baffles 28, as required. The baffle-positioner 30 in-use positions or holds the or a baffle 28. The baffle-positioner 30 preferably includes at least one rail element or rail 86a. There may be one or more rails 86a. Preferably, a rail 86a is at, on, adjacent to, or recessed within a said side wall 38b. A plurality of rails 86a may be associated with a side wall 38b. Optionally, an opposing side wall 38b may also be provided with one or more rails 86a. The baffle is engageable, and more preferably slidably engageable with the baffle-positioner 30. Any addition or alternative to a rail element may be envisioned, such as a fastener. A clip may be an example of a fastener. The baffle-positioner 30 may optionally be able to prevent or inhibit the baffle 28 from extending to the base of the waste-water container 22, so as to form the said gap. Thus, the baffle-positioner 30 may have an abutmentstop portion 86b. The storage container 18 in-use stores FOG removed from the water by the greaseremoval apparatus 24. The storage container 18 may be referred to as a FOG collection container. The storage container 18 is preferably removably connectable to the remainder of the system 10 and more preferably to the grease-trap assembly 12 thereof, but non-removably connectable or fixed may be options. Most preferably, the storage container 18 is removably connectable to the grease-removal apparatus 24, and most preferably to the grease conduit 48 thereof. A wheel element 32 in-use engages a ground surface and enables the waste-water container to be movable relative thereto. The waste-water container 22 may be translatable, such as by being wheeled from one location to another. This may beneficially remove the need to lift the system 10, which may be heavy and / or which may require a plurality of users. The wheel element 32 is preferably at or adjacent the base 38a of the waste-water container 22. There may be a single wheel element such that the system may be lifted until only the wheel element remains in contact with the ground surface. Preferably however, there is a plurality of wheel elements 32. In the illustrated embodiment, there are at least three and more preferably at least four wheel elements 32. The, each or at least one wheel element 32 may include a castor wheel. Optionally, a secondary function of the wheel element 32 is to provide braking. Optionally, a tertiary function of the wheel element 32 is to provide height-adjustment or levelling. The wheel element 32 may thus include a foot, feel leveller, levelling feet attachment, or support. The foot may act as a brake. The foot may selectably lock the wheel. . The foot may be movable to selectably engage with the ground surface. The foot may apply friction to the ground surface to prevent or inhibit accidental movement of the system 10 and / or waste-water container 22 relative to the ground surface. The foot may include an elastomeric material, such as rubber. Any means or element for moving the foot may be envisioned. However, preferably, the wheel element 32 may further include a supporting structure and a stem. Preferably, the stem is a threaded stem by virtue of having a screw thread. The supporting structure may correspondingly have a complementary screw thread. The stem is preferably engaged or engageable with the foot. Rotation of the stem, such as via a cog, relative to the supporting structure moves the foot into and / or out of engagement with the ground surface, according to the direction of rotation. Once the foot is in engagement with the ground surface, continued rotation results in the castor wheel being lifted off the ground. Additionally, the height of the waste-water container 22 may be altered, thereby providing height-adjustment or levelling of the system 10. The height-adjustment may be beneficial to enable the system 10 to fit under a counter or shelf. An example of a suitable wheel element 32 is a Footmaster Levelling Castor by Keystone Wood Ltd T / A Keystone Castor Company of Birmingham, UK . The handle 34 increases the ergonomics of the system 10. In particular, a user can easily grasp the system 10. The handle 34 is preferably associated with the waste-water container 22. There may be a plurality of handles 34. The handle or handles 34 may allow one user, such as an engineer to move the system 10 and / or waste-water container 22, without the need fora second user, such as a second engineer. Logistics and labour costs may be reduced. In the illustrated embodiment, there is a front handle 34 and a rear handle 34 but any number and / or in any location may be envisioned. The filter 20 in-use filters solids from the waste-water, such as food debris and / or coagulated FOG. The filter 20 is preferably at or adjacent the waste-water inlet 36a. Optionally, the filter 20 is provided on the grease flow-path and / or water flow-path downstream of the waste-water inlet 36a. The filter 20 may be provided on the grease flow-path and / or water flow-path upstream of the upstream baffle 28. The filter 20 may take any suitable or desirable shape. The filter 20 is preferably in or positionable in the waste-water container 22. However, the filter 20 could easily be positioned outside of the waste-water container 22. Positioning of the filter 20 outside of the waste-water container 22 may beneficially further increase the volume of dirty waste-water that can be processed in the waste-water container 22. In the illustrated embodiment, the filter 20 may be provided in the entry chamber, although any other chamber may be envisioned. Preferably, the filter 20 is or is part of a basket, as shown in Figure 9. The basket may even have a handle. A basket captures and stores the captured solids. Optionally, the filter 20 may be removably connectable to the rest of the system 10. In-use, a user obtains and installs a grease-trapping system 10. The system 10 may be fully assembled. Alternatively, the system 10 may be provided in a partially or fully disassembled condition, as shown in Figure 10. The system 10 may be provided as a kit of parts. Optionally, any part of the system 10 may be provided by itself. For example, the user may be missing a part but may have one or all remaining parts of the system 10. To install the system 10, the user may need to carry out any or all of the following steps, not necessarily in the following order. The system 10 may be partly or fully assembled offsite then moved onsite. The system 10 may be assembled partly or fully onsite. The waste-water container 22 is connected to the plumbing, as per Step 100 in Figure 11. The waste-water container 22 is positioned so that the waste-water inlet 36a and the waste-water outlet 36b are aligned or substantially aligned with the inlet pipe and the outlet pipe, respectively. The or each waste-water-pipe-connector 16 is actuated from a non-connecting condition to a connecting condition. In the illustrated embodiment, this involves extending the concertinaed body from a retracted condition into an extended condition where the waste-water-pipe-connector 16 extends over and beyond the join, to create a fluid-tight seal. The or each clip may be used to secure the waste-water-pipe-connector 16 around the plumbing and / or inlet 36a or outlet 36b. Here, the winged jubilee clips are tightened by screwing. The or each flow controlling device 26 may need to be opened, if not already open, to let water flow through the system 10, at Step S110. Any part of the system 10 may already be fixed or connected in position. However, if any or all remaining parts are connectable, and more preferably removably connectable, the part or parts may be installed, in any order. The, each or at least one baffle 28 may be engaged with the waste-water container 22, and more preferably the or a said baffle-positioner 30. In the illustrated embodiment, the, each or a said baffle 28 is translatably or slidingly engaged with the baffle-positioner 30. If provided, the filter 20 is positioned in the waste-water container 22. The grease-removal apparatus 24 may need to be assembled if in a kit of parts. Before, during or after assembly of the grease-removal apparatus 24, the grease-removal apparatus 24 is engaged with the waste-water container 22. The skimming-wheel 54 is oriented preferably upright or vertical and positioned so as to extend partially through the layer of FOG in-use. The storage container 18 is connected or mounted to the waste-water container 22 and / or connected to the grease conduit 48. The lid 40 is connected to the wall or walls 38b of the waste-water container 22. The controlling assembly 14 is connected to the grease-trap assembly 12. Connection is preferably achieved via the connection means 66. In the illustrated embodiment, connection involves connecting the complementary connection elements of the controlling assembly 14 and of the grease-trap assembly 12. The complementary connection element of the controlling assembly 14 which is preferably in the form of a head unit may be lowered onto the complementary connection element of the greasetrap assembly 12 for docking the complementary connection elements together. Optionally, the controlling assembly 14 may be locked in position by the locking means 76. In the illustrated embodiment, locking may involve pivoting the head unit through an angle to engage complementary locking elements 76. The angle may be 90°. The direction of locking rotation may be clockwise or anticlockwise. The force-transmission element 72 is connected to the support frame 52 of the greaseremoval apparatus 24, such as via one or more couplings. Docking and optionally locking the controlling assembly 14 may even automatically result in alignment and / or engagement of the force-transmission element 72 and the support frame 52. Once the grease-trapping system 10 is installed and connected to the plumbing, the grease-trapping system 10 can be used to separate FOG, and optionally solids, such as food debris from the waste-water. In the illustrated embodiment, dirty waste-water empties from the sink, and moves through the plumbing. As the waste-water-pipe-connector 16 connects the waste-water inlet 36a to the plumbing, the waste-water and FOG enters the waste-water container 22 via the waste-water inlet 36a via the waste-water-pipe-connector 16. If a filter 20 is provided, the filter 20 captures solids such as food debris. Beneficially, solids are prevented or inhibited from entering the remainder of the waste-water container 22. Thus, the filter 20 reduce or prevents solids from interfering with FOG removal. The filter 20 may also prevent or inhibit solids from settling on the base 38a and forming a layer of decomposing organic matter which is malodorous and / or hard to clean. Furthermore, preventing solids from settling on the base 38a and forming a layer maintains the total volumetric capacity of the waste-water container 22 and / or eliminates or reduces the risk of any flow channel 84 becoming obstructed. Whilst larger lumps of FOG may be caught by the filter 20, liquid FOG and smaller lumps of FOG may be small enough to pass through pores of the filter 20. The waste-water and FOG move along their respective flow-paths. If an upstream baffle 28 is provided, the upstream baffle 28 may direct the flow through the entry chamber towards the base 38a of the flow channel 84. This redirection of the flow-paths may slow down the movement of fluid entering the waste-water container 22. Turbulence within the waste-water container 22 may be reduced, which may in turn improve the FOG removal efficiency. Beneficially, the flow channel of the upstream baffle 28 being at or adjacent the base 38a may also help prevent or inhibit settling of matter on the base 38a. The grease flow-path and the water flow-path extend through the flow channel 84, if provided. Thus, in the illustrated embodiment, the waste-water and FOG move through the gap between the second region 80b of the upstream baffle 28 and the base 38a. The dirty waste-water enters the main chamber. If a heating element 50 is provided, the heating element 50 may heat the dirty wastewater to a set temperature, see Step S120. The set temperature may be a temperature sufficient to convert any solid or coagulated FOG into liquid FOG. The temperature may be at least 50°C, more preferably at least 60°C, and even more preferably at least 70°C. FOG may naturally float to the surface, thereby forming a layer of FOG on top of the waste-water, whether in liquid or non-liquid form. In the case of a passive FOG trap, the FOG layer on the top of the waste-water may be removed by several means. Firstly, if liquid, the FOG may be left to cool and thereby solidify into a layer of solid FOG at the surface of the waste-water. The solid layer of FOG may be simply removed manually. Alternatively, a grease conduit 48 may be provided at the desired height in the waste-water container 22. Floating FOG may simply flow along the grease conduit 48 and out of the waste-water container 22. Preferably, the system 10 includes a grease-removal apparatus 24 and more preferably, a powered orelectrically-energisable grease-removal apparatus 24. The grease-removal apparatus 24 removes the FOG from the waste-water, at Step S130. In the illustrated embodiment, the grease-removal apparatus 24 removes FOG as follows. The rotatable skimming-wheel 54 is made to rotate. As part of the skimming-wheel 54 contacts the layer of, preferably liquid, FOG, the skimming-wheel 54 results in some FOG being skimmed or lifted away from the layer. Preferably, the FOG adheres temporarily to the skimming-wheel 54 due to surface tension and / or viscosity. However, alternatives may be envisioned. For example, the skimming-wheel may include a scoop or scooping element which scoops up the FOG. The skimming-wheel 54 may be activated according to a programme or may be continuously on. For instance, the skimming-wheel 54 may be active at scheduled intervals per day. The lifted FOG is preferably wiped off by the, each or at least one wiper element 56. In the illustrated embodiment, FOG on the skimming-wheel 54 is wiped off by the wiper element or elements 56. The wiper elements 56 are preferably immobile and the skimming-wheel 54 is rotating. However, the reverse arrangement may be envisioned. In a further modification, both wiper elements and skimming-wheel may be moving. FOG removed by a said wiper element 56 may flow into or fall in a catching channel 58, if provided, or directly into the grease conduit 48. If a storage container 18 is provided, the FOG flows into the storage container 18, as per Step S140. The storage container 18 can be emptied for example when full. The storage container 18 may optionally be cleaned. If the storage container 18 is disconnectable from the rest of the system 10, emptying and optionally cleaning may be done offsite. To reduce the period of time during which the system 10 is out of use due to the absence of the storage container 18, a used first storage container 18 may be swapped for an empty or emptier second storage container 18 distinct from the first storage container 18, and optionally before the first storage container 18 has been emptied. Preferably, the grease-removal apparatus 24 is controlled by the controlling assembly 14. In the illustrated embodiment, the motor 68 emits a driving force. The forcetransmission element 72 transmits the force to drive the rotation of the skimming-wheel 54. In the illustrated embodiment, the force-transmission element 72 includes at least one coupling, and preferably cooperating couplings, such as one or more gears. The couplings are interlocked when the controlling assembly 14 is connected to the greasetrap assembly 12. The programmable logic controller 74 may be able to vary the rotational velocity of the skimming-wheel 54, such as in response to an input. For example, the user may provide an input to increase or decrease the rate of FOG removal. The input may be from a sensor. For example, a sensor may be able to detect the thickness of the layer of the FOG. If the layer is thinner or thicker than a target layer, the programmable logic controller 74 may increase the speed of FOG removal, for instance by altering the speed of the motor 68 and / or increasing the rotational velocity of the skimming-wheel 54 accordingly. It may be possible to avoid too much FOG accumulating in the waste-water container 22. Conversely, the grease-removal apparatus 24 may be driven to operate at a lower speed or even be stopped if there is little or no FOG to be removed. Thus, the controlling assembly 14 may thereby optimise the rate of FOG removal, and avoid wasting energy. The controlling assembly 14 may also control the heating element 50. If the system 10 includes a temperature sensor, the temperature sensor may sense the temperature of the waste-water and / or of the heating element 50. In response, the controlling assembly 14 or at least the programmable logic controller 74 thereof may issue a command to the heating element 50 to emit heat or alter the heat output thereof, such as to ensure that the waste-water has a sufficient temperature to cause FOG to become liquid. If a security cutout element is provided, the security cutout element may automatically stop the heating element 50 from emitting heat, for example in the event of a fault. Meanwhile, clean waste-water continues moving along the water flow-path. The cleaned waste-water exits the waste-water container 22 via the waste-water outlet 36b. As the waste-water outlet 36b is preferably connected to the downstream plumbing via the waste-water-pipe-connector 16, the waste-water flows into the downstream plumbing. If a downstream baffle 28 is provided, as in the illustrated embodiment, the downstream baffle 28 prevents or inhibits any FOG floating on top of the waste-water in the main chamber from spreading to the downstream chamber and / or exiting through the wastewater outlet 36b. Similarly to the upstream baffle 28 if provided, the downstream baffle 28 causes the waste-water to flow through a flow channel 84. As the flow rate of wastewater has already been decreased and / or the FOG is floating on the surface of the wastewater in the main chamber, FOG is not entrained or entrained to a lesser extent by the slow-moving waste-water through the flow channel 84 of the downstream baffle 28. Instead, it is generally the fluid in the immediate vicinity of the flow channel 84 that enters the flow channel 84 of the downstream baffle 28. As the FOG in the main chamber is generally floating at the surface of the waste-water, the fluid drawn in through the flow channel 84 is water, rather than water and FOG. This differs from the upstream baffle 28, where the waste-water has a sufficiently high flow rate to drag along FOG through the flow channel 84 of the upstream baffle 28. Furthermore, the waste-water within the downstream chamber may have a lower temperature than waste-water in the main chamber. This temperature difference may be sufficient to cause any entrained FOG to solidify. Depending on the density of the solid FOG, such as due to other impurities, solid FOG may sink rather than float. As such, this provides a further mechanism to prevent or reduce the quantity of FOG entering the plumbing downstream. When the system 10 needs to be serviced, such as cleaned and / or repaired, any or all of: the waste-water inlet 36a, the waste-water outlet 36b, the upstream pipe, and the downstream pipe may need to be closed or shut, to prevent or inhibit flow of waste-water therein. This may involve actuating one or more flow controlling devices 26 into an obstructing condition. In the illustrated embodiment, one or more sluices 78 may be shut, such as the sluice 78 associated with the waste-water inlet 36a and / or the sluice 78 associated with the waste-water outlet 36b. The upstream pipe may not need a flow controlling device 26, for example in the absence of any water being poured into the sink upstream and / or due to a ll-bend. Similarly, the downstream pipe may not need a flow controlling device 26 if no cleaned waste-water is entering the downstream pipe. The user disconnects the waste-water inlet 36a and / or waste-water outlet 36b from the upstream and / or downstream plumbing, at Step 200 in Figure 12. This requires reconfiguring the waste-water-pipe-connector 16 from the connecting condition to a nonconnecting condition. In the illustrated embodiment, the waste-water-pipe-connector 16 is reconfigured from being extended to retracted by compressing the concertina structure. Retraction reveals the join between the waste-water inlet 36a and / or the wastewater outlet 36b, and the corresponding pipe. Preferably both the inlet 36a and the outlet 36b are disconnected to be able to the remove the whole system 10, such as for offsite cleaning. No cutting or moving of plumbing is required. Even if only one of the inlet 36a and the outlet 36b is disconnected whilst the other remains connected to the plumbing, this may be beneficial. The system 10 can be pivoted around the connection to the plumbing, for example to move a side wall 38b of the system 10 away from the wall of the kitchen. The concertina structure and / or the flexibility of the waste-water-pipe-connector 16, such as by being formed of an elastomeric material, may beneficially enable or facilitate pivoting. Greater access from all sides may facilitate cleaning. Optionally, the system 10 or part thereof may be sealed prior to removal. This may beneficially prevent or inhibit fluid and / or smells from escaping from the grease-trap assembly 12 and / or waste-water container 22. The or each flow controlling device 26, such as a sluice, may be actuated into a closed or obstructing condition. This may beneficially close the inlet 36a and / or outlet 36b. At least part, or even the whole system 10 may be moved offsite at Step S210. Removal may be in parts or all at once. The or each wheel element 32 may facilitate this, for instance by negating the need for any lifting. As such, the system 10 or at least the wastewater container 22 thereof may be wheeled, including when full of waste-water. Due to the malodorous fumes and / or risk of spillage, it may be beneficial to keep the system 10 or at least the waste-water container 22 closed, such as with the lid 40 connected to the at least one side wall 38b, when moving the system 10 and / or waste-water container 22 thereof. Beneficially, the controlling assembly 14 may be separated from the grease-trap assembly 12 or any part thereof. Thus, the grease-trap assembly 12 can remain closed or even sealed, even in the absence of the controlling assembly 14. This may beneficially prevent or inhibit dirty waste-water and / or malodorous fumes from escaping from the grease-trap assembly 12. The system 10 or part thereof may be moved offsite, such as outside, to a van, in a warehouse and / or a workshop. As it is no longer essential to avoid soiling the immediate vicinity of the system 10 as is the case in a kitchen, cleaning may be done by pressure washing, as per Step S220. Pressure washing may beneficially increase the speed and ease of cleaning at least compared to manual cleaning. The level of hygiene may also be improved. Optionally, the system 10 may be partly or fully disassembled offsite. Any removably connectable parts of the system 10 may be removed, for separate cleaning and / or to further facilitate cleaning access. In a different example use case, any removably connectable part may be disconnected from other parts of the system 10 and moved offsite. Any or all remaining parts may remain in location. For example, the controlling assembly 14 may be disconnected, for cleaning, servicing or charging by way of examples. The plug 60a and the socket 60b are disconnected, preferably by unscrewing. The plug 60a may be stored within the plugreceiving storage cavity 42g. Tidying away the plug 60a may beneficially protect the plug 60a and any associated cable. The controlling assembly 14 is unlocked, preferably by actuating the locking means 76 into an unlocked condition. In the shown embodiment, the head unit is unlocked by rotating in the unlocking direction, here clockwise. The head unit is lifted away from the grease-trap assembly 12. Optionally, the remaining parts of the system 10, such as the grease-trap assembly 12, may remain in situ. The wastewater container 22 may remain connected to the plumbing and / or onsite. Optionally, the access flap 42e may be opened to retrieve the FOG remover 46 or part thereof, as the at least one wiper element 56. The wiper element or elements 56 may be cleaned offsite. If the parts remaining in situ are cleaned, removal of the controlling assembly 14 is further beneficial as this may prevent or inhibit damage to any electronics within. In all use scenarios, the system 10 or parts thereof may be cleaned offsite, such as via a van. The van may have a wash area, a pressure washer, a pump, an Intermediate Bulk Container (ibc) tank for waste, and an ibc tank for fresh water, but any of the above may be omitted and / or a plurality of any of the above may be provided. The system 10 or any part thereof may be placed in the wash area, and optionally deconstructed if desired or required. This may involve, for example, removing the controlling assembly 14 if not already done. The lid 40 may be disconnected from the waste-water container 22 and removed. The or each baffle 28 may be removed. The grease-removal apparatus 24 or any part thereof, such as the at least one wiper element 56 thereof may be removed. The system 10 may need to be emptied of any waste-water and / or FOG, such as into the ibc tank for waste using the pump. Detergent and / or soap may be added to the system 10 or any part thereof. The system 10 or part thereof may then be pressure washed, by way of example only. Optionally, the pump may be used a second time, to pump out the water and debris dislodged by the cleaning from the waste-water container 22. Once the system 10 or at least the relevant part is cleaned and / or serviced, the system 10 may be reassembled, onsite and / or offsite. Before, during or after re-assembly, the system 10 may be moved back onsite, at Step S230. It may even be considered that the grease-trapping unit or system 10 may be part of a wider system 10 comprising a plurality of grease-trapping systems 10 when one greasetrapping system 10 needs to be cleaned or serviced, it may immediately be replaced by a further clean and functional grease-trapping system 10. This may beneficially reduce the amount of down time when no dirty waste-water can be processed. Similarly, any dirty or non-functional removably connectable part of the grease-trapping system 10 may be swapped for a corresponding clean and functional part. Once again, this may beneficially reduce the amount of down time. Furthermore, as pressure washing is faster than manual cleaning, each unit is faster to clean. Thus, in a given period of time, a greater number of units may be cleaned, at least compared to manually cleaned units. In either case, the inlet 36a and the outlet 36b are aligned or realigned with their respective inlet pipe and outlet pipe. The or each waste-water-pipe-connector 16 is actuated or configured back from the non-connecting condition to the connecting condition. In the illustrated embodiment, this involves extending the concertina body to overlap with and extend beyond the join. This beneficially provides a fluid-tight seal. The system 10 is once again installed and functional. Although the waste-water-pipe-connector preferably includes a concertinaed body, alternatives to the concertinaed body may be envisioned, such as cam lock connection or standard rubber couplings. Any of the features and caveats that apply to one of the embodiments may easily be provided or applicable to any of the other embodiments. Whilst a preferred shape may have been specified for any of the above-described features, any alternative shape may be envisioned in any of transverse or lateral crosssection, longitudinal cross-section, in side view, or in plan view. The shape may be any or any combination of: curved, part curved, non-curved, linear, part linear, non-linear, a broken line, any polygon, whether regular or irregular, having one or more chamfered and / or rounded corners, a triangle, a quadrilateral, such as a square, a rectangle, a trapezium, a trapezoid, a pentagon, a hexagon, a heptagon, an octagon, or any other polygon, a cross, an ellipse, a circle, part circular, an oval, or any abstract shape. It is therefore possible to provide a grease-trap system which is easier, faster, and / or cheaper to clean, as well as more hygienic after cleaning. These benefits are provided by virtue of all or part of the system being easily disconnected and cleaned offsite. The system can be disconnected from the plumbing without needing to cut any pipes, due to the retractable connectors. If only the controlling assembly needs cleaning, the controlling assembly can be disconnected and moved offsite. Offsite cleaning means that pressure washing is possible, instead of manual cleaning as is presently the case in the prior art. It is further possible to provide an energisable controlling assembly removably connectable to the grease-trap assembly, which provides a number of advantages. The controlling assembly can be removed independently from the grease-trap assembly such as for maintenance or cleaning of the controlling assembly. Interchangeability of controlling assemblies, such as replacing a damaged or soiled controlling assembly for another functional and clean controlling assembly reduces the period of time during which the grease-trapping system is out of order. If the controlling assembly is selectable from a range of different assemblies, this enables greater customisability. When the grease-trap assembly is being cleaned, removal of the energisable controlling assembly protects electronics from being damaged by the cleaning process and / or may provide greater access to the grease-trap assembly, thereby facilitating the ease of cleaning of the grease-trap assembly. Modularity of the system may reduce the number of users required to move and / or clean the grease-trapping system . It is further possible to provide a waste-water-pipe-connector which enables the greasetrapping system to be selectably fluidly connected to a pipe and / or disconnected therefrom without needing to cut or move the pipe. This is achieved by the retractable nature of the waste-water-pipe-connector. Disconnection enables the grease-trapping system to be removed and relocated offsite for maintenance and / or cleaning. There is also provided a method of using the grease-trapping system to trap grease. In the case of an automatic system, the trapping is carried out in a more controlled manner, by virtue of having a controlling assembly. In the case of a passive system, no electricity is required, which is easier to install and environmentally friendly. As water is highly conductive of electricity, the absence of any electrically-energised parts may reduce the risk of accidental electrocution. It is further possible to provide a method of cleaning the grease-trapping system. If moved offsite for cleaning, cleaning is more hygienic because this avoids soiling the in-use location, such as a kitchen. Additionally, greater access from all sides and / or pressure washing of the grease-trapping system facilitates cleaning, further increasing hygiene. The words ‘comprises / comprising’ and the words ‘having / including’ when used herein with reference to the present invention are used to specify the presence of stated features, integers, steps or components, but do not preclude the presence or addition of one or more other features, integers, steps, components or groups thereof. It is appreciated that certain features of the invention, which are, for clarity, described in the context of separate embodiments, may also be provided in combination in a single embodiment. Conversely, various features of the invention which are, for brevity, described in the context of a single embodiment, may also be provided separately or in any suitable sub-combination. The embodiments described above are provided by way of examples only, and various other modifications will be apparent to persons skilled in the field without departing from the scope of the invention as defined herein.

Claims

1. An automatic grease-trapping system for separating fat, oil and / or grease from waste-water, the automatic grease-trapping system comprising:a grease-trap assembly having:a waste-water container for receiving waste-water containing fat, oil and / or grease, the waste-water container having:a waste-water inlet,a waste-water outlet, anda grease flow-path between the waste-water inlet and outlet; anda grease-removal apparatus for removing the fat, oil and / or grease from the waste-water;the automatic grease-trapping system further comprising:a removable energisable controlling assembly adapted to control the grease-trap assembly, the controlling assembly being removably connectable to the grease-removal apparatus;and / ora retractable waste-water-pipe-connector on each of the waste-water inlet and a waste-water outlet, each waste-water-pipe-connector being reconfigurable between an extended condition and a retracted condition for enabling the greasetrap assembly to be releasably connectable to plumbing;for allowing disconnection for offsite cleaning of the automatic greasetrapping system or part thereof.

2. An automatic grease-trapping system as claimed in claim 1, wherein the controlling assembly comprises a programmable logic controller.

3. An automatic grease-trapping system as claimed in any one of the preceding claims, wherein the controlling assembly further comprises a force-transmission element and a motor.

4. An automatic grease-trapping system as claimed in claim 3, wherein the forcetransmission element includes at least one coupling.

5. An automatic grease-trapping system as claimed in any one of the preceding claims, wherein at least one said waste-water-pipe-connector has a concertinaed body so as to form bellows.

6. An automatic grease-trapping system as claimed in any one of the preceding claims, further comprising a flow controlling device.

7. An automatic grease-trapping system as claimed in claim 6, wherein the flow controlling device includes a sluice.

8. An automatic grease-trapping system as claimed in any one of the preceding claims, further comprising a baffle.

9. An automatic grease-trapping system as claimed in claim 8, wherein the baffle has an in-use top region and the baffle defines a flow channel, the flow channel being spaced-apart from the in-use top region such that the flow channel is in-use below any fat, oil and / or grease floating at a surface of the waste-water.

10. An automatic grease-trapping system as claimed in any one of the preceding claims, wherein the waste-water container further includes a baffle-positioner.

11. An automatic grease-trapping system as claimed in claim 10 when depending on claim 8 or on claim 9, wherein the baffle-positioner includes a rail with which the baffle is engageable.

12. An automatic grease-trapping system as claimed in any one of the preceding claims, further comprising a heating element.

13. An automatic grease-trapping system as claimed in any one of the preceding claims, wherein the grease-removal apparatus includes a skimming element.

14. An automatic grease-trapping system as claimed in any one of the preceding claims, wherein the grease-removal apparatus includes a wiper element.

15. An automatic grease-trapping system as claimed in any one of the preceding claims, further comprising a storage container for storing the fat, oil and / or grease removed from the waste-water by the grease-removal apparatus.

16. An automatic grease-trapping system as claimed in any one of the preceding claims, further comprising a wheel element at or adjacent a base of the wastewater container for engaging a ground surface and enabling the waste-water container to be movable relative thereto.

17. An automatic grease-trapping system as claimed in claim 16, wherein the wheel element includes a castor wheel and / or a foot.

18. An automatic grease-trapping system as claimed in any one of the preceding claims, further comprising a handle.

19. An automatic grease-trapping system as claimed in any one of the preceding claims, further comprising a filter, and optionally the filter being removable.

20. An energisable controlling assembly for controlling a grease-trap assembly of an automatic grease-trapping system as claimed in any one of the preceding claims, the controlling assembly being removably connectable via connection means to the grease-trap assembly.

21. A retractable waste-water-pipe-connector for connecting the waste-water container of a grease-trapping system to plumbing, wherein the waste-water-pipe-connector is reconfigurable between an extended condition and a retracted condition for enabling the grease-trap assembly to be releasably connectable to plumbing when the retractable waste-water-pipe-connector is in the retracted condition.

22. A passive grease-trapping system for separating fat, oil and / or grease from waste-water, the passive grease-trapping system comprising:a grease-trap assembly having:a waste-water container for receiving waste-water containing fat, oil and / or grease, the waste-water container having:a waste-water inlet,a waste-water outlet, anda grease flow-path between the waste-water inlet and outlet; anda retractable waste-water-pipe-connector on each of the waste-water inlet and a waste-water outlet, each waste-water-pipe-connector being reconfigurable between an extended condition and a retracted condition for enabling the greasetrap assembly to be releasably connectable to plumbing;for allowing disconnection for offsite cleaning of the passive greasetrapping system.

23. A method of using a grease-trapping system for separating fat, oil and / or grease from waste-water, the method comprising the steps of:a] providing a grease-trapping system as claimed in any one of claims 1 to 19 or in claim 22; andb] when waste-water is received within the waste-water container, the greasetrapping system removes the fat, oil and / or grease from the waste-water.

24. A method of cleaning a grease-trapping system, the method comprising the step of:cleaning at least part of the grease-trapping system as claimed in any one of claims 1 to 19 or in claim 22.

25. A method of cleaning a grease-trapping system as claimed in claim 24, wherein at least part of the grease-trapping system is moved offsite prior to cleaning.

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