Water treatment system for purifying contaminated cleaning fluid

Abstract

The present invention relates to a water treatment system for purifying contaminated cleaning fluid and, more specifically, to a water treatment system for purifying contaminated cleaning fluid, in which cleaning fluid discharged from exhaust gas recirculation (EGR) or intelligent control by exhaust recycling (iCER), installed on dual-fuel vessels using gas and diesel, is subjected to water treatment by dead-end filtration by means of a membrane unit that is immersed in the cleaning fluid within a cleaning fluid tank unit.

Description

Water treatment system to purify contaminated cleaning fluid

[0001] The present invention relates to a water treatment system for purifying a polluted cleaning liquid, and more particularly, to a water treatment system for purifying a polluted cleaning liquid, which performs water treatment by dead-end filtration of the cleaning liquid discharged from an EGR (Exhaust Gas Recirculation) or iCER (Intelligent Control by Exhaust Recycling) installed in a vessel using dual fuels such as gas and diesel by a membrane portion immersed in the cleaning liquid in a cleaning liquid tank portion.

[0002] Most modern ships are equipped with engines and boilers for their own power and heating. These engines and boilers require fuel combustion, and the exhaust gas generated during the combustion process contains harmful substances such as sulfur oxides (SOx), nitrogen oxides (NOx), and particulate matter (PM).

[0003] The sulfur oxides (SOx) and nitrogen oxides (NOx) mentioned above can cause respiratory diseases by acting on the mucous membranes of the human body, and these substances are also pollutants designated as Group 1 carcinogens by the International Agency for Research on Cancer under the World Health Organization (WHO). In addition, when the sulfur oxides (SOx) and nitrogen oxides (NOx) mentioned above are released into the air as they are, they react with moisture (H20) in the air to form sulfuric acid (H2SO4) and nitric acid (HNO3), respectively, which are the main cause of acid rain. Meanwhile, the particulate matter (PM) mentioned above is in the form of small particles as opposed to gaseous pollutants. When the particulate matter (PM) in the exhaust gas is released into the air as it is, it can cause visibility impairment by reducing visibility, or the fine particles can enter the human body through the lungs or respiratory system and cause various diseases. The fine dust that has recently become a problem in Korea is also caused by the particulate matter (PM) mentioned above, and can be seen as the main cause of air pollution.

[0004] Therefore, measures to prevent harmful substances in exhaust gases are necessary. In particular, ships are known to emit exhaust gases 130 times more than automobiles due to the large engine output. Therefore, specific and practical measures to prevent the emission of large amounts of harmful substances are required for ship exhaust gases.

[0005] Against this backdrop, the International Maritime Organization (IMO) continues to strengthen environmental regulations for ships. This is accelerating the transition to eco-friendly ships powered by eco-friendly energy or fuel, or incorporating technologies to reduce marine pollution or improve ship energy efficiency. Consequently, the number of ships using a single fuel, HFO (Heavy Fuel Oil), is decreasing, while the number of dual-fuel ships is gradually increasing.

[0006] In the case of ships using a single fuel, a scrubber, a desulfurization device that removes and purifies sulfur oxides (SOx) from the gas emitted from the ship's engine and boiler, has been installed and operated, and development of a water treatment device that treats wastewater discharged from the scrubber has also been at a considerable level.

[0007] However, in the case of ships using dual fuel, development has been carried out relatively recently, and research on them is insufficient compared to water treatment devices installed on ships using single fuel.

[0008] In particular, ships using dual fuels are equipped with EGR (Exhaust Gas Recirculation), which reduces nitrogen oxides (NOx) generated from internal combustion engines by cooling a portion of the exhaust gas and injecting it into the engine's combustion chamber together with general air to reduce the amount of nitrogen oxides (NOx) generated from the engine and the amount of fuel consumed and carbon dioxide generated, and iCER (Intelligent Control by Exhaust Recycling), which is a device that cools the exhaust gas with an intelligent exhaust recirculation device and recirculates it back into the engine to burn more exhaust gas before it is released into the atmosphere, thereby minimizing emissions. However, there is a problem that the water treatment devices accompanying the EGR and iCER are not popular and are very limited.

[0009] FIG. 1 is a drawing illustrating a conventional EGR and iCER combined greenhouse gas emission reduction device (90) of a ship, which is disclosed in Korean Patent Publication No. 10-2231477 (March 18, 2021).

[0010] Referring to FIG. 1, the EGR and iCER combined greenhouse gas emission reduction device (90) of the ship includes an exhaust gas receiver (91) that temporarily stores exhaust gas exhausted from each cylinder of the ship engine (E) to remove pulsation, a turbocharger (92) that compresses and supplies combustion air by exhaust gas supplied from the exhaust gas receiver (91), a cleaning unit (93) that sprays cleaning water into the exhaust gas supplied through the turbocharger (92) to remove SOx and soot and cleans it and circulates cooling water to cool the exhaust gas, a CO2 absorption unit (94) that sprays an absorption liquid into the exhaust gas that has passed through the cleaning unit (93) to absorb and remove CO2, an absorption liquid production unit (95) that produces a high-concentration CO2 absorption liquid and supplies it to the CO2 absorption unit (94), and a divalent metal hydroxide aqueous solution and an ammonium salt aqueous solution discharged from the CO2 absorption unit (94). It is configured to include an absorbent regeneration unit (96) that reacts to regenerate absorbent and NH3 and circulates and supplies them to a CO2 absorption unit (94) to reuse them as absorbent, a combustion air receiver (97) that temporarily stores combustion air compressed by the supercharger (92) to remove pulsation and supplies it to each cylinder of the ship engine (E), and an exhaust gas circulation unit (98) that supplies exhaust gas that has passed through the CO2 absorption unit (94) to the supercharger (92).

[0011] The above cleaning unit (93) includes a cleaning water supply module (931) that receives clean water and supplies neutralized cleaning water that is circulated, a cleaning module (932) that cools and cleans the cleaning water from the cleaning water supply module (931) by spraying it with exhaust gas from the turbocharger (92), a cooling module (933) that cools the exhaust gas by circulating cooling water, a cleaning water circulation module (934) that allows the cleaning water to circulate through the cleaning module (932), and a water treatment module (935) that treats the cleaning water.

[0012] However, the EGR and iCER combined greenhouse gas emission reduction device (90) of the above-mentioned vessel only describes that it treats the cleaning water drained from the buffer tank through the water treatment module (935) and returns the treated cleaning water to the buffer tank, but does not provide a water treatment device optimized for EGR and iCER installed in a vessel using dual fuel.

[0013] (Patent Document 1) Korean Patent Publication No. 10-2231477 (March 18, 2021)

[0014] The present invention has been devised to solve the above problems.

[0015] The purpose of the present invention is to provide a water treatment system for purifying contaminated cleaning fluid, which is specialized in treating cleaning fluid discharged from EGR (Exhaust Gas Recirculation), iCER (Intelligent Control by Exhaust Recycling), etc. installed in ships using dual fuels such as gas and diesel.

[0016] Another object of the present invention is to provide a water treatment system for purifying contaminated cleaning liquid, which comprises a membrane portion immersed in a cleaning liquid within a cleaning liquid tank portion, so that the cleaning liquid located on the outside of the separation membrane is sucked into the inner space of the separation membrane, thereby filtering the cleaning liquid.

[0017] Another object of the present invention is to provide a water treatment system for purifying contaminated cleaning liquid by performing water treatment of the cleaning liquid in a dead-end filtration manner through a membrane section, thereby removing and precipitating floating solids through the membrane surface.

[0018] Another object of the present invention is to provide a water treatment system for purifying contaminated cleaning liquid, which configures a treatment water transport section so that the treatment water located in the inner space of the membrane section can flow out of the inner space through the pressure of a pump, or the treatment water located outside the inner space can enter the inner space.

[0019] Another object of the present invention is to provide a water treatment system for purifying contaminated cleaning liquid, which comprises a bidirectional pump on a treatment water pipe section to move filtered treatment water in the forward direction or, if necessary, to move the treatment water in the reverse direction to enable backwashing of the membrane section.

[0020] Another object of the present invention is to provide a water treatment system for purifying contaminated washing liquid, in which a portion of the treatment liquid moving in the forward direction is stored in a treatment liquid storage unit, so that the treatment liquid stored in the treatment liquid storage unit can be used as backwash water.

[0021] Another object of the present invention is to provide a water treatment system for purifying contaminated cleaning liquid, which counts the normal cleaning time during which the treatment liquid moves in the forward direction and automatically performs reverse washing for a preset time after a predetermined normal cleaning time has elapsed.

[0022] Another object of the present invention is to provide a water treatment system for purifying contaminated cleaning liquid, which automatically performs normal and reverse washing within the system, thereby increasing the efficiency of cleaning liquid treatment through periodic membrane washing and facilitating the operation of the system.

[0023] Another object of the present invention is to provide a water treatment system for purifying contaminated cleaning liquid, which automatically performs backwashing when the differential pressure between the inner and outer spaces of a membrane portion is within a preset differential pressure range, so that automatic backwashing is performed according to the on-site situation in addition to periodic backwashing.

[0024] Another object of the present invention is to provide a water treatment system for purifying contaminated cleaning liquid, which counts the number of backwashing operations and automatically injects a first chemical into the treatment liquid moving in the reverse direction for backwashing when the counted number of backwashing operations reaches a preset number of backwashing operations, thereby performing chemical cleaning at regular intervals in addition to backwashing by the treatment liquid.

[0025] Another object of the present invention is to provide a water treatment system for purifying contaminated cleaning liquid, which analyzes the filtered treated water and, if the content of components contained in the treated water does not meet the standard, returns the treated water to the cleaning liquid tank, thereby finally discharging only the treated water that meets certain standards such as IMO MEPC 107(49).

[0026] Another object of the present invention is to provide a water treatment system for purifying contaminated cleaning liquid, which can maintain the oil content of the final treated water to 15 ppm or less.

[0027] Another object of the present invention is to provide a water treatment system for purifying contaminated cleaning liquid, which forms a second body part extending from the lower side of the first body part forming the first chamber and forming a second chamber having a shape in which the cross-sectional size becomes smaller as it goes downward, thereby allowing the lower slurry to gather toward the center without installing a scraper, thereby simplifying the internal structure of the sedimentation tank, facilitating the operation and management of the sedimentation tank, and reducing the possibility of safety accidents during system maintenance.

[0028] Another object of the present invention is to provide a water treatment system for purifying contaminated cleaning liquid, which comprises a slurry treatment unit at the lower side of the second body unit, and sucks up slurry accumulated at the lower side of the cleaning liquid tank unit and transports and stores it in the slurry tank unit of a ship, etc.

[0029] Another object of the present invention is to provide a water treatment system for purifying contaminated cleaning liquid by injecting a polyaluminum chloride (PAC) coagulant into the cleaning liquid before it enters the cleaning liquid tank, thereby coagulating total suspended solids (TSS) and destroying and coagulating total organic carbon (TOC) emulsion.

[0030] In order to achieve the above-mentioned purpose, the present invention is implemented by an embodiment having the following configuration.

[0031] According to one embodiment of the present invention, the present invention includes a water treatment unit for treating a cleaning solution, and the water treatment unit is characterized by including a cleaning solution tank unit for storing the cleaning solution, and a cleaning solution filter unit located within the cleaning solution tank unit for filtering the cleaning solution.

[0032] According to another embodiment of the present invention, the present invention is characterized in that the cleaning liquid filter unit includes a membrane unit that is immersed in the cleaning liquid and sucks the cleaning liquid located on the outside of the separation membrane into the inner space of the separation membrane to filter the cleaning liquid.

[0033] According to another embodiment of the present invention, the present invention is characterized in that the membrane part filters the cleaning liquid by a total filtration method so that the filtered cleaning liquid, which is the treated water, can be used as backwash water of the membrane part.

[0034] According to another embodiment of the present invention, the water treatment system for purifying the contaminated cleaning liquid is characterized in that it includes a treated water transport unit that is in communication with the inner space of the membrane section and enables the flow of the treated water so that the treated water located in the inner space can come out of the inner space or the treated water located outside the inner space can enter the inner space.

[0035] According to another embodiment of the present invention, the present invention is characterized in that the treated water transport unit includes a treated water conduit unit that guides the transport of the treated water, and a treated water pump unit formed on the treated water conduit unit that moves the treated water in both forward and reverse directions.

[0036] According to another embodiment of the present invention, the present invention is characterized in that the treated water transport unit includes a treated water storage unit that receives a portion of the treated water moving in the forward direction by the treated water pump unit, stores it as backwash water, and provides the stored treated water when the membrane unit is backwashed.

[0037] According to another embodiment of the present invention, the present invention is characterized in that the treated water transport unit includes a treated water control unit connected to the treated water pump unit and controlling the operation of the treated water pump unit to move the treated water in a forward or reverse direction.

[0038] According to another embodiment of the present invention, the present invention is characterized in that the treatment water control unit includes a purification module that controls the treatment water to move in a forward direction, a reverse flushing module that controls the treatment water to move in a reverse direction, and a control module that is connected at one end to the purification module and at the other end to the reverse flushing module, counts the operating time of the purification module, and operates the reverse flushing module for a preset time after a certain period of purification.

[0039] According to another embodiment of the present invention, the treatment water control unit includes a differential pressure detection module that detects a differential pressure between the inner and outer spaces of the membrane unit, and the control module is connected to the differential pressure detection module to operate the purification module when the detected differential pressure is outside a preset differential pressure range, and to operate the reverse flushing module when the detected differential pressure is within the preset differential pressure range.

[0040] According to another embodiment of the present invention, the present invention is characterized in that the treated water transport unit further includes a first chemical addition unit that injects the first chemical into the treated water when the treated water moves in the reverse direction so that the first chemical can enter the inner space of the membrane unit.

[0041] According to another embodiment of the present invention, the first chemical addition unit comprises a first chemical storage unit that stores the first chemical, a first chemical conduit unit having one end connected to the first chemical storage unit and the other end connected to the treatment water conduit unit to guide the transport of the first chemical, a first chemical pump unit formed on the first chemical conduit unit to move the first chemical, and a first chemical control unit that controls the first chemical pump unit to count the number of backwashings and to inject the first chemical into the treatment water moving in the reverse direction for backwashing when the number of backwashings reaches a preset number of backwashings.

[0042] According to another embodiment of the present invention, the water treatment system for purifying the contaminated cleaning liquid is characterized in that it further includes a treated water recovery unit that is connected to the treated water transport unit and analyzes the treated water and recovers the treated water if the content of the component contained in the treated water does not meet the standard value.

[0043] According to another embodiment of the present invention, the treated water recovery unit is characterized in that it includes a recovery judgment unit that analyzes the components of the treated water and determines whether the components of the treated water satisfy the reference value, and a recovery decision unit that is connected to the recovery judgment unit and allows the transportation by the treated water transport unit to occur when the components of the treated water satisfy the reference value, and blocks the transportation by the treated water transport unit and allows the transportation to occur when the components of the treated water do not satisfy the reference value.

[0044] According to another embodiment of the present invention, the present invention is characterized in that the water recovery determination unit includes a water recovery valve unit that controls the flow of the treated water, a water recovery pipe unit that is connected to the water recovery valve unit on one side and connected to the cleaning solution tank unit on the other side to guide the transfer of the treated water to be recovered, and a water recovery pump unit that is formed on the water recovery pipe unit and moves the treated water to be recovered.

[0045] According to another embodiment of the present invention, the cleaning solution tank unit includes a first body unit forming a first chamber, and a second body unit extending from a lower side of the first body unit and communicating with the first chamber, but forming a second chamber having a shape in which a cross-sectional size becomes smaller as it goes downward, and the water treatment system for purifying the contaminated cleaning solution is characterized in that it includes a slurry treatment unit connected to the second body unit and discharging slurry settled in the second body unit to the outside.

[0046] According to another embodiment of the present invention, the water treatment system for purifying the contaminated cleaning liquid is characterized by including a cleaning liquid transport unit that supplies the cleaning liquid to the water treatment unit, and a coagulant adding unit that is connected to the cleaning liquid transport unit at a front end of the water treatment unit and injects a coagulant into the cleaning liquid supplied.

[0047] The present invention can obtain the following effects through the combination and use of the configuration described above and the following examples.

[0048] The present invention has the effect of providing a water treatment system for purifying contaminated cleaning fluid, which is specialized in treating cleaning fluid discharged from EGR (Exhaust Gas Recirculation), iCER (Intelligent Control by Exhaust Recycling), etc. installed in ships using dual fuels such as gas and diesel.

[0049] The present invention provides a water treatment system for purifying contaminated cleaning liquid, which comprises a membrane portion immersed in a cleaning liquid within a cleaning liquid tank portion, and filters the cleaning liquid through a process in which the cleaning liquid located on the outside of the separation membrane is sucked into the inner space of the separation membrane.

[0050] The present invention has the effect of providing a water treatment system for purifying contaminated cleaning liquid by performing water treatment of the cleaning liquid in a dead-end filtration manner through a membrane section, thereby removing and precipitating floating solids through the membrane surface.

[0051] The present invention has the effect of providing a water treatment system for purifying contaminated cleaning liquid, which configures a treatment water transport unit, and enables the flow of treated water so that the treated water located in the inner space of the membrane unit can come out of the inner space through the pressure of the pump, or the treated water located outside the inner space can enter the inner space.

[0052] The present invention provides a water treatment system for purifying contaminated cleaning liquid by configuring a bidirectional pump on a treatment water pipe section to move filtered treatment water in the forward direction or, if necessary, to move the treatment water in the reverse direction to enable backwashing of the membrane section.

[0053] The present invention has the effect of providing a water treatment system for purifying contaminated washing liquid, in which a portion of the treatment liquid moving in the forward direction is stored in a treatment liquid storage unit, so that the treatment liquid stored in the treatment liquid storage unit can be used as backwash water.

[0054] The present invention has the effect of providing a water treatment system for purifying contaminated cleaning liquid, which counts the normal cleaning time during which the treatment liquid moves in the forward direction and automatically performs reverse washing for a preset time after a predetermined normal cleaning time has elapsed.

[0055] The present invention provides a water treatment system for purifying contaminated cleaning liquid, which automatically performs normal and reverse washing within the system, thereby increasing the efficiency of cleaning liquid treatment through periodic membrane washing and facilitating the operation of the system.

[0056] The present invention has the effect of providing a water treatment system for purifying contaminated cleaning liquid, which automatically performs backwashing when the differential pressure between the inner and outer spaces of a membrane portion is within a preset differential pressure range, thereby allowing automatic backwashing to be performed according to on-site conditions in addition to periodic backwashing.

[0057] The present invention has the effect of providing a water treatment system for purifying a contaminated cleaning liquid, which counts the number of backwashing operations and automatically injects a first chemical into the treatment liquid moving in the reverse direction for backwashing when the counted number of backwashing operations reaches a preset number of backwashing operations, thereby performing chemical cleaning at regular intervals in addition to backwashing by the treatment liquid.

[0058] The present invention provides a water treatment system for purifying contaminated cleaning liquid, which analyzes the filtered treated water and, if the content of components contained in the treated water does not meet the standard, returns the treated water to the cleaning liquid tank, thereby finally discharging only the treated water that meets certain standards such as IMO MEPC 107(49).

[0059] The present invention has the effect of providing a water treatment system for purifying contaminated cleaning liquid, which allows the oil content of the final treated water to be maintained at 15 ppm or less.

[0060] The present invention provides a water treatment system for purifying contaminated cleaning liquid, which simplifies the internal structure of a sedimentation tank, facilitates operation and management of the sedimentation tank, and reduces the possibility of safety accidents during system maintenance by forming a second body part extending to the lower side of a first body part forming a first chamber and forming a second chamber having a shape in which the cross-sectional size becomes smaller as it goes downward, thereby allowing lower slurry to gather toward the center without installing a scraper.

[0061] The present invention provides a water treatment system for purifying contaminated cleaning liquid, which comprises a slurry treatment unit at the lower side of a second body unit, and sucks up slurry accumulated at the lower part of a cleaning liquid tank unit and transports and stores it in a slurry tank unit of a ship, etc.

[0062] The present invention has the effect of providing a water treatment system for purifying contaminated cleaning liquid by injecting a polyaluminum chloride (PAC) coagulant into the cleaning liquid before it enters the cleaning liquid tank, thereby coagulating total suspended solids (TSS) and destroying and coagulating total organic carbon (TOC) emulsions.

[0063] Figure 1 is a drawing illustrating a conventional EGR and iCER combined greenhouse gas emission reduction device of a ship.

[0064] FIG. 2 is a drawing illustrating a water treatment system for purifying contaminated cleaning liquid according to one embodiment of the present invention.

[0065] Figure 3 is a drawing illustrating the water treatment unit of Figure 2.

[0066] Figure 4 is a drawing illustrating the treatment water transport unit and slurry treatment unit of Figure 2.

[0067] FIG. 5 is a drawing illustrating a water treatment system for purifying contaminated cleaning liquid according to another embodiment of the present invention.

[0068] FIG. 6 is a drawing illustrating a water treatment system for purifying contaminated cleaning liquid according to another embodiment of the present invention.

[0069] FIG. 7 is a drawing illustrating a water treatment system for purifying contaminated cleaning liquid according to another embodiment of the present invention.

[0070] Hereinafter, preferred embodiments of a water treatment system for purifying contaminated cleaning liquid according to the present invention will be described in detail with reference to the attached drawings. In the following description of the present invention, if a detailed description of a known function or configuration is judged to unnecessarily obscure the gist of the present invention, such detailed description will be omitted. Unless otherwise defined, all terms in this specification have the same general meaning as those skilled in the art to which the present invention pertains. If there is a conflict between the meaning of a term used in this specification and the definition used in this specification, the definition used in this specification shall prevail.

[0071] Unless otherwise specifically stated herein, the term "cleaning liquid" refers to contaminated cleaning liquid discharged from EGR (Exhaust Gas Recirculation), iCER (Intelligent Control by Exhaust Recycling), etc. installed in dual-fuel ships, and the term "treated water" in contrast to the above cleaning liquid refers to purified cleaning liquid obtained by treating the above contaminated cleaning liquid.

[0072] Ships that use dual fuels, such as gas and diesel, can be equipped with Exhaust Gas Recirculation (EGR), which reduces nitrogen oxides (NOx) generated from internal combustion engines by cooling a portion of the exhaust gas and injecting it into the engine's combustion chamber along with normal air to reduce fuel consumption and carbon dioxide emissions, and Intelligent Control by Exhaust Recycling (iCER), which cools the exhaust gas and recirculates it back into the engine to burn more exhaust gas before it is released into the atmosphere, thereby minimizing emissions.

[0073] The water treatment system (1) for purifying contaminated cleaning liquid of the present invention refers to a system for purifying cleaning liquid discharged from EGR, iCER, etc. installed in a dual-fuel ship, etc. FIG. 2 is a drawing illustrating a water treatment system (1) for purifying contaminated cleaning liquid according to an embodiment of the present invention. Referring to FIG. 2, the water treatment system (1) for purifying the contaminated cleaning liquid includes a cleaning liquid transport unit (10), a coagulant addition unit (20), a water treatment unit (30), a treated water transport unit (40), and a slurry treatment unit (50).

[0074] The above-described cleaning liquid transfer unit (10) is configured to supply the cleaning liquid to a water treatment unit (30) to be described later, and refers to a configuration that stores the cleaning liquid discharged from EGR, iCER, etc., and then transfers the cleaning liquid to a water treatment unit (30) to be described later for water treatment of the stored cleaning liquid. Referring to Fig. 2, the cleaning liquid transfer unit (10) includes a cleaning liquid storage unit (11), a cleaning liquid conduit unit (12), and a cleaning liquid pump unit (13).

[0075] The above-mentioned cleaning fluid storage unit (11) refers to a configuration that stores cleaning fluid discharged from EGR, iCER, etc. installed to treat nitrogen oxides (NOx), etc. generated from an engine using dual fuel.

[0076] The above cleaning solution pipe section (12) is configured to guide the transfer of cleaning solution stored in the cleaning solution storage section (11) by having one side connected to the cleaning solution storage section (11) and the other side connected to the cleaning solution tank section (31) described later.

[0077] The above cleaning solution pump unit (13) is formed on the cleaning solution conduit unit (12) and refers to a configuration that moves the cleaning solution to the cleaning solution tank unit (31) described later, and may preferably be configured as a feed pump.

[0078] The above coagulant adding unit (20) refers to a configuration that injects a coagulant into the cleaning liquid supplied by being connected to the cleaning liquid conveying unit (10) at the front end of the water treatment unit (30) to be described later. The coagulant adding unit (20) can inject a polyaluminum chloride (PAC) coagulant into the cleaning liquid before it enters the cleaning liquid tank unit (31) to be described later, and through the coagulant injection, the total suspended solids (TSS) are coagulated and the total organic carbon (TOC) emulsion is destroyed and aggregated. To this end, the coagulant adding unit (20), as illustrated in FIG. 2, includes a coagulant storage unit (21), a coagulant conduit unit (22), and a coagulant pump unit (23).

[0079] The above coagulant storage unit (21) is configured to store a coagulant to be used in a coagulation reaction. The coagulant stored by the coagulant storage unit (21) is not limited to a specific coagulant, but it can be seen that polyaluminum chloride (PAC) is preferably stored.

[0080] The above coagulant conduit (22) is configured such that one side is connected to the coagulant storage (21) and the other side is connected to the cleaning solution conduit (12), thereby guiding the transport of the coagulant stored in the coagulant storage (21). The coagulant conduit (22) allows the coagulant stored in the coagulant storage (21) to be injected onto the cleaning solution flowing along the cleaning solution conduit (12).

[0081] The above coagulant pump unit (23) is formed on the coagulant conduit unit (22) and refers to a configuration that injects the coagulant into the cleaning solution conduit unit (12), and can preferably be configured as a chemical pump.

[0082] The water treatment unit (30) is configured to process a cleaning solution, and is connected to the cleaning solution transport unit (10), receives the cleaning solution from the cleaning solution transport unit (10), filters the supplied cleaning solution, generates treated water, and transports it. Preferably, the water treatment unit (30) may be configured to filter the cleaning solution with the coagulant added thereto by membrane separation using a membrane. Referring to FIG. 2, the water treatment unit (30) includes a cleaning solution tank unit (31) and a cleaning solution filter unit (32).

[0083] The above cleaning solution tank section (31) is configured to store the cleaning solution to be treated, and the cleaning solution tank section (31) allows the cleaning solution supplied from the cleaning solution transfer section (10) to remain in the cleaning solution tank section (31) for a certain period of time so that sludge is precipitated. Referring to Fig. 2, the cleaning solution tank section (31) includes a first body section (311) and a second body section (312).

[0084] The first body part (311) is configured to form a first chamber (3111) which is an empty space inside, and preferably, a cleaning solution filter part (32) to be described later can be positioned inside the first chamber (3111). The shape of the first body part (311) is not limited to a specific shape, but can be configured to have a square box shape, as illustrated in FIG. 3, so as to facilitate installation in a vessel having a narrow space.

[0085] The second body part (312) may be configured to extend downward from the first body part (311) and may be configured in a hopper shape that tapers toward the bottom so that sediments can naturally gather toward the center of the lower side of the cleaning solution tank part (31). As illustrated in FIG. 3, the lowermost section (B) of the second body part (312) is illustrated as having a horizontal shape, but the shape of the second body part (312) is not necessarily limited to this shape, and the lowermost section (B) illustrated as being horizontal in FIG. 3 may be formed to be inclined. Referring to FIGS. 2 and 3, the second body part (312) includes a second chamber (3121) and a cleaning solution inlet (3122).

[0086] The second chamber (3121) above refers to an empty space that is connected to the first chamber but has a shape in which the cross-sectional size becomes smaller as it goes downward. The present invention configures the second chamber (3121) so that the lower slurry is collected in the center without installing a scraper to scrape and collect the sediment, thereby simplifying the internal structure of the sedimentation tank, facilitating the operation and management of the sedimentation tank, and reducing the possibility of safety accidents occurring during system maintenance.

[0087] The above cleaning solution inlet (3122) is a hole formed to penetrate the other side on one side and communicate with the cleaning solution transfer unit (10), and may be preferably formed in the second body part (312). The cleaning solution filter unit (32) described later is formed at a point (H) that is as far apart as possible from the center of the cleaning solution inlet (3122), as shown in FIG. 3. max ) is positioned to maximize the residence time of the cleaning solution. The present invention maximizes the residence time of the cleaning solution, thereby increasing the sedimentation rate, significantly reducing the fouling frequency of the cleaning solution filter section, reducing the number of backwashing operations, increasing the production of treated water by reducing the number of backwashing operations, and reducing the amount of chemicals used during chemical cleaning.

[0088] The cleaning solution inlet (3122) may be formed in the second body part (312), and as illustrated in FIG. 3, may be formed at a point spaced apart a certain distance (d) upward along the central axis (X) of the cleaning solution tank part (31) based on the inner bottom surface (B) of the second body part (312). The position of the cleaning solution inlet (3122) is such that a sludge settling space can be secured as much as the formed distance (d).

[0089] The above cleaning solution filter unit (32) refers to a configuration that is located within the cleaning solution tank unit (31) and filters the cleaning solution. The cleaning solution filter unit (32) may be located within the first body unit (311) of the cleaning solution tank unit (31), and preferably, the cleaning solution filter unit (32) may be formed at a position that maximizes the residence time of the cleaning solution for settling sludge in the cleaning solution that has entered the cleaning solution tank unit (31) through the cleaning solution inlet (3122). In this way, the present invention positions the cleaning solution filter unit (32) at a position that is as far apart as possible from the cleaning solution inlet (3122), so that the cleaning solution that has entered the cleaning solution tank unit (31) through the cleaning solution inlet (3122) is not immediately filtered by the cleaning solution filter unit (32), but rather ensures sufficient sludge settling time before being filtered by the cleaning solution filter unit (32). This increases the sedimentation rate of sludge, ensures smooth slurry discharge, increases the sludge sedimentation rate of the cleaning solution, reduces the suction pressure of the pump connected to the cleaning solution filter unit (32), and increases the amount of treated water, which is the filtered cleaning solution. In addition, the load on the cleaning solution filter unit (32) is lowered, making maintenance and management of the cleaning solution filter unit (32) easier.

[0090] More preferably, the lower part of the cleaning solution filter unit (32) is positioned at a point (H) that is as far upward as possible along the central axis (X) of the cleaning solution tank unit (31) based on the center of the cleaning solution inlet (3122), as shown in FIG. 3. max ) can be arranged in a direction perpendicular to the central axis (X) of the cleaning solution tank section (31). Through this, the present invention prevents the load from being concentrated on a specific area of ​​the cleaning solution filter section (32) and ensures that cleaning solution filtering is performed evenly throughout the entire area of ​​the cleaning solution filter section (32).

[0091] Referring to FIG. 3, the cleaning liquid filter unit (32) includes a membrane unit (321) and a branch unit (322).

[0092] The above membrane part (321) refers to a configuration that is immersed in the cleaning solution and sucks the cleaning solution located on the outside of the separation membrane into the inner space of the separation membrane to filter the cleaning solution. Preferably, the membrane part (321) may be configured to filter the cleaning solution in a dead-end filtration manner so that the filtered cleaning solution, which is the treated water, can be used as backwash water of the membrane part (321). By dead-end filtration through the membrane part (321), floating solids included in the cleaning solution are filtered out without passing through the membrane of the membrane part (321), and floating solids that do not pass through the membrane are precipitated to the lower part of the cleaning solution tank part (31). The above membrane portion (321) may be formed in a generally square plate shape with an empty space formed on the inside, as illustrated in FIG. 3, and a plurality of membrane portions (321) of this shape may be formed at regular intervals in an erected form as illustrated in FIG. 3 to form a group. Preferably, the membrane portion (321) may be coated with silicon carbide of the ceramic series, and a pore of 0.1 μm may be formed.

[0093] The above branch pipe section (322) is configured to be connected to the membrane section (321) so that, in the subsequent cleaning process, the treated water passing through the membrane of the membrane section (321) can be transferred to the treated water conduit section (41), and, in the subsequent backwash process, the treated water transferred along the treated water conduit (41) can be moved to the inner space of the membrane section (321). To this end, the branch pipe section (322) can be coupled to both ends of the membrane section (321) having a generally square plate shape, as illustrated in FIG. 3.

[0094] The above-mentioned treated water transport unit (40) is a configuration that is connected to the inner space of the membrane unit (321) and enables the flow of the treated water so that the treated water located in the inner space of the membrane unit (321) can come out of the inner space through the pressure of the pump, or so that the treated water located outside the inner space can enter the inner space. Referring to FIG. 4, the above-mentioned treated water transport unit (40) includes a treated water pipe unit (41), a treated water pump unit (42), a treated water storage unit (43), a treated water control unit (44), and a first chemical addition unit (45).

[0095] The above-mentioned treatment water conduit (41) is configured to guide the transport of the treatment water, and can be connected at one end to the branch pipe (322) and at the other end to the treatment water storage (43) described later. Accordingly, the treatment water delivered from the branch pipe (322) can be transported along the treatment water conduit (41), and the treated water transported and stored along the treatment water conduit (41) can be introduced into the branch pipe (322) through the treatment water conduit (41) during the backwashing process.

[0096] The above-mentioned treatment water pump unit (42) is formed on the treatment water conduit unit (41) and is configured to move the treatment water not only in the forward direction but also in the reverse direction. Preferably, the treatment water pump unit (42) may be configured as a bidirectional pump. The present invention configures the treatment water pump unit (42), which is a bidirectional pump, on the treatment water conduit unit (41), so that the filtered treatment water can be moved in the forward direction, and, if necessary, the treatment water can be moved in the reverse direction to enable backwashing of the membrane unit (321). A portion of the treatment water moved in the forward direction by the treatment water pump unit (42) may be stored in the treatment water storage unit (43) described below, and the remaining treatment water that is not stored in the treatment water storage unit (43) may be discharged outside the ship.

[0097] The above-mentioned treated water storage unit (43) refers to a configuration that receives a portion of the treated water moving in the forward direction by the treated water pump unit (42), stores it as backwash water, and provides the stored treated water when the membrane unit (321) is backwashed. To this end, the treated water storage unit (43) is configured to be in communication with the treated water conduit unit (41).

[0098] The above-mentioned treatment water control unit (44) is connected to the treatment water pump unit (42) and controls the operation of the treatment water pump unit (42) to move the treatment water in the forward or reverse direction. Since the cleaning liquid filter unit (32) of the present invention uses a membrane membrane to perform filtering by membrane separation, if the operation of the equipment becomes long, many foreign substances may adhere to the surface of the membrane unit (321). These foreign substances eventually reduce the filtering efficiency, and the present invention configures the treatment water control unit (44) so ​​that this problem can be automatically solved under the system (1) so that the direction of the treatment water is automatically switched from the forward direction to the reverse direction and from the reverse direction to the forward direction. Referring to FIG. 4, the above-mentioned treatment water control unit (44) includes a cleaning module (441), a backwash module (442), a control module (443), and a differential pressure detection module (444).

[0099] The above purification module (441) is configured to control the treatment water pump unit (42) so that the treatment water moves in the forward direction. When the purification module (441) is activated, the treatment water moves in the forward direction by the treatment water pump unit (42), as shown in the arrow direction shown in FIG. 4.

[0100] The above reverse-wash module (442) is configured to control the treated water pump unit (42) so that the treated water moves in the reverse direction. When the reverse-wash module (442) is activated, the treated water moves in the reverse-wash direction by the treated water pump unit (42), as shown in the arrow direction shown in FIG. 4.

[0101] The above control module (443) is configured such that one side is connected to the above-mentioned normalization module (441) and the other side is connected to the above-mentioned reverse-washing module (442), and counts the operating time of the above-mentioned normalization module (441) so that the reverse-washing module (442) operates for a preset time after a certain period of normalization. Normalization and reverse-washing are automatically performed within the system by the above-mentioned control module (443), thereby increasing the efficiency of cleaning solution treatment through periodic membrane cleaning and facilitating the operation of the system.

[0102] The differential pressure detection module (444) is configured to detect the differential pressure between the inner and outer spaces of the membrane portion (321), and as illustrated in FIG. 4, the differential pressure detection module (444) may be connected to the control module (443). If the differential pressure detected by the differential pressure detection module (444) is outside a preset differential pressure range, the control module (443) may be configured to operate the purification module (441), and if the detected differential pressure is within the preset differential pressure range, the control module (443) may be configured to operate the reverse-washing module (442). Preferably, if the differential pressure detected by the differential pressure detection module (444) is within a range of -0.5 to -0.7 bar, reverse-washing by the reverse-washing module (442) may be performed for 25 seconds. The present invention configures the differential pressure detection module (444) so ​​that, in addition to periodic reverse washing, automatic reverse washing is performed according to the on-site situation.

[0103] The first chemical addition unit (45) above refers to a configuration that injects the first chemical into the treated water when the treated water moves in the reverse direction so that the first chemical can enter the inner space of the membrane unit (321). According to the first chemical addition unit (45), CEB (Chemical Enhanced Backwash) becomes possible. The present invention configures the first chemical addition unit (45) to count the number of backwashings, and when the counted number of backwashings reaches a preset number of backwashings, automatically injects the first chemical into the treated water moving in the reverse direction for backwashing, so that chemical cleaning is performed at regular intervals in addition to backwashing by the treated water. Preferably, the preset number of backwashings may be 40, and the first chemical may be injected into the treated water moving in the reverse direction by the first chemical addition unit (45) during the 40th backwashing. The concentration of the injected first chemical is diluted by the backwash water to have a concentration of about 1,000 to 1,500 ppm, and the backwash water and the first chemical dilution solution can be injected into the membrane unit (321) to have a reaction time of 5 minutes. Referring to FIG. 4, the first chemical addition unit (45) includes a first chemical storage unit (451), a first chemical conduit unit (452), a first chemical pump unit (453), and a first chemical control unit (454).

[0104] The first chemical storage unit (451) is configured to store the first chemical, and is connected to the first chemical conduit unit (452) described later, and functions to supply the first chemical stored in the first chemical conduit unit (452) when necessary. The first chemical is not limited to a specific chemical substance, but may preferably be H2SO4.

[0105] The above first chemical conduit (452) refers to a configuration in which one side is connected to the first chemical storage (451) and the other side is connected to the treated water conduit (41) to guide the transport of the first chemical.

[0106] The above first chemical pump unit (453) refers to a configuration formed on the first chemical conduit unit (452) to move the first chemical. The first chemical stored in the first chemical storage unit (451) by the first chemical pump unit (453) can flow into the treated water conduit unit (41) along the first chemical conduit unit (452).

[0107] The first chemical control unit (454) refers to a configuration that controls the first chemical pump unit (453) to inject the first chemical into the treated water moving in the reverse direction for reverse washing when the number of reverse washings reaches a preset number of reverse washings by counting the number of reverse washings. As described above, preferably, the preset number of reverse washings may be 40 times, the reaction time of the first chemical may be set to 5 minutes, and the injection concentration of the first chemical injected into the reverse washing water may be 1,000 to 1,500 ppm.

[0108] The above slurry treatment unit (50) refers to a configuration that is connected to the second body part (312) and discharges the slurry settled in the second body part (312) to the outside. In this specification, slurry refers to a concept including the cleaning solution and sludge, and sludge refers to a coagulated sediment. The present invention configures the slurry treatment unit (50) to suck up the slurry accumulated in the lower part of the cleaning solution tank part (31) and transport and store it in a slurry tank part of a ship, etc. The slurry extraction by the slurry treatment unit (50) can be automatically performed at regular intervals. Referring to FIG. 4, the slurry treatment unit (50) includes a slurry pipe part (51), a slurry pump part (52), and a slurry tank part (53).

[0109] The above slurry conduit (51) is configured to communicate with the second chamber (3121) of the second body part (312) and guide the transport of the slurry. A slurry containing a large amount of sludge is collected at the lower side of the second chamber (3121), and the slurry conduit (51) discharges the slurry collected in the second chamber (3121) out of the cleaning solution tank part (31) by driving the slurry pump part (52) described later.

[0110] The above slurry pump unit (52) refers to a configuration formed on the slurry conduit unit (51) to transport the slurry. The pressure within the slurry conduit unit (51) can be maintained in a negative pressure state by the slurry pump unit (52). Preferably, a valve is formed at the front end of the slurry pump unit (52), and by opening the valve while the slurry pump unit (52) is continuously operating, the slurry collected at the lower side of the cleaning solution tank unit (31) can be quickly discharged to the outside, or the opened flow path can be closed to quickly stop the discharge of the slurry.

[0111] The above slurry tank section (53) refers to a configuration that stores the slurry transferred through communication with the slurry conduit section (51). The slurry tank section (53) can form an empty space inside to store the slurry transferred through the slurry conduit section (51).

[0112] FIG. 5 is a drawing showing a water treatment system (1) for purifying a contaminated cleaning liquid according to another embodiment of the present invention. Referring to FIG. 5, in this embodiment, unlike the embodiments of FIGS. 2 to 4, a temperature control unit (33) is additionally configured in the water treatment unit (30). To avoid redundant description, only the temperature control unit (33) will be described below.

[0113] The temperature control unit (33) above refers to a configuration located within the cleaning solution tank unit (31) and controlling the temperature of the cleaning solution. Preferably, the temperature control unit (33) may be configured to maintain the temperature of the cleaning solution stored in the cleaning solution tank unit (31) or the washing water mixed with fresh water and a second chemical, which will be described later, at a set temperature. More preferably, the temperature of the cleaning solution is maintained at 45 to 50°C by the temperature control unit (33), thereby reducing the viscosity of the cleaning solution flowing into the cleaning solution tank unit (31) and improving the filtering effect by the membrane unit (321) through liquefaction of oil. In addition, the set temperature maintained by the temperature control unit (33) is maintained at a temperature at which the chemical used in the chemical cleaning of the membrane unit (321) exhibits the highest activity, thereby increasing the efficiency of backwashing by the treated water. The present invention configures the temperature control unit (33) to increase the production volume of treated water and reduce the amount of chemical used and slurry generated. The temperature control unit (33) includes a temperature sensing unit (331) and a heater unit (332).

[0114] The above temperature sensing unit (331) refers to a configuration that senses the temperature of the cleaning liquid stored in the cleaning liquid tank unit (31). The temperature sensing unit (331) is connected to a heater unit (332) to be described later, and whether the heater unit (332) is operated can be determined based on the temperature of the cleaning liquid sensed by the temperature sensing unit (331).

[0115] The heater unit (332) refers to a configuration that heats the cleaning liquid when the temperature of the cleaning liquid detected by the temperature sensing unit (331) falls below the set temperature. Preferably, the heater unit (332) may be spaced apart from the longitudinal central axis (Y1) of the cleaning liquid filter unit (32) by a certain distance in the downward direction so as to improve the filtering effect by the cleaning liquid filter unit (32), and may be arranged along an axis (Y2) parallel to the longitudinal central axis (Y1), as illustrated in FIG. 5. Through this, the cleaning liquid heated by the heater unit (332) rises and is filtered by the cleaning liquid filter unit (32), and the cleaning liquid with a relatively low temperature descends and is heated by the heater unit (332) and then filtered by the cleaning liquid filter unit (32), thereby improving the filtering effect. Preferably, the heater unit (332) may be heated by electricity.

[0116] FIG. 6 is a drawing illustrating a water treatment system (1) for purifying a contaminated cleaning liquid according to another embodiment of the present invention. Referring to FIG. 6, this embodiment differs from the embodiments of FIGS. 2 to 4 in that a treated water recovery unit (60) is additionally configured. Hereinafter, the treated water recovery unit (60) will be described.

[0117] The above-mentioned treated water recovery unit (60) is connected to the treated water transport unit (40) to analyze the treated water and to recover the treated water if the content of the component contained in the treated water does not meet the standard. The present invention configures the above-mentioned treated water recovery unit (60) to analyze the treated water from which the cleaning solution has been filtered and to recover the treated water back to the cleaning solution tank unit (31) if the content of the component contained in the treated water does not meet the standard, thereby allowing only the treated water that satisfies certain standards such as IMO MEPC 107 (49) to be ultimately discharged. Referring to FIG. 6, the above-mentioned treated water recovery unit (60) includes a recovery judgment unit (61) and a recovery decision unit (62).

[0118] The above recovery determination unit (61) refers to a configuration that analyzes the components of the treated water and determines whether the components of the treated water satisfy the above-mentioned standard. Preferably, the recovery determination unit (61) can determine whether the oil content of the final treated water flowing within the treated water conduit (41) exceeds 15 ppm.

[0119] The above recovery decision unit (62) is a configuration that is connected to the recovery judgment unit (61) and allows the treatment water to be transported by the treatment water transport unit (40) when the components of the treatment water satisfy the above-mentioned standard, and blocks the transport by the treatment water transport unit (40) and allows the recovery when the components of the treatment water do not satisfy the above-mentioned standard. Referring to FIG. 6, the recovery decision unit (62) includes a recovery valve unit (621), a recovery pipe unit (622), and a recovery pump unit (623).

[0120] The above-described water recovery valve unit (621) is configured to control the flow of the treated water and has a function of opening or closing the flow path of the treated water. Preferably, the water recovery valve unit (621) is connected to the treated water conduit unit (41), and when it is determined that water recovery is necessary, the valve unit (621) closes the treated water conduit unit (41) so that the treated water cannot flow any further, and allows the treated water to flow along the water recovery conduit unit (622) described later.

[0121] The above-mentioned water recovery pipe (622) refers to a configuration in which one side is connected to the water recovery valve (621) and the other side is connected to the cleaning solution tank (31) to guide the transfer of the recovered treated water. The meaning of the other side of the water recovery pipe (622) being connected to the cleaning solution tank (31) is not only that the other side of the water recovery pipe (622) is directly connected to the cleaning solution tank (31), but also that the other side of the water recovery pipe (622) is connected to the cleaning solution pipe (12) or the cleaning solution storage (11) so that the recovered treated water ultimately flows into the cleaning solution tank (31).

[0122] The above-mentioned water recovery pump unit (623) refers to a configuration formed on the water recovery pipe unit (622) to move the treated water to be recovered. Preferably, the water recovery pump unit (623) can be operated so that the pressure within the water recovery pipe unit (622) is maintained in a negative pressure state, and when the water recovery determination unit (61) determines that water recovery is necessary, the water recovery valve unit (621) can be controlled so that the treated water can be recovered quickly.

[0123] FIG. 7 is a drawing showing a water treatment system (1) for purifying a contaminated cleaning liquid according to another embodiment of the present invention. Referring to FIG. 7, unlike the previous embodiment, this embodiment has a feature in that a filter washing unit (70) is additionally configured. Hereinafter, only the filter washing unit (70) will be described.

[0124] The filter washing unit (70) is configured to wash the cleaning solution filter unit (32), and preferably, it can be viewed as a configuration to clean in place the cleaning solution filter unit (32) after draining the cleaning solution tank unit (31). That is, the water treatment system (1) for purifying the contaminated cleaning solution of the present invention counts the normal washing time for the treatment water to move in the forward direction, and when a certain normal washing time has elapsed or the differential pressure between the inner and outer spaces of the membrane unit (321) is outside a preset differential pressure range, reverse washing is performed by the treatment water transport unit (40). At this time, the number of reverse washings is counted, and when the number of reverse washings reaches the preset number of reverse washings, the first chemical adding unit (45) injects the first chemical into the treatment water used for reverse washing so that reverse washing is performed by the treatment water into which the first chemical has been injected. When the backwashing with the treated water injected with the first chemical is completed, the slurry treatment unit (50) connected to the cleaning solution tank unit (31) is opened to drain the cleaning solution tank unit (31), and when the draining is completed, the fresh water injected with the second chemical is circulated by the filter washing unit (70) to perform static washing. The present invention enables the cleaning solution filter unit (32) to be easily washed without disassembling related equipment for washing the cleaning solution filter unit (32) through the filter washing unit (70). In addition, the filter washing unit (70) enables continuous circulation washing for a set period of time, so that it can be easily applied to systems such as ships where the space is narrow and the disposal of waste chemicals and slurry during chemical washing is problematic.

[0125] Preferably, before the washing by the filter washing unit (70) is performed, the backwashing by the above-mentioned treated water and the CEB (Chemical Enhanced Backwash) in which the first chemical is added to the backwashing water at regular intervals may be performed, and the circulating washing by the filter washing unit (70) may be performed only after the substance stored in the cleaning solution tank unit (31) is discharged to the outside through the slurry treatment unit (50) when the water treatment unit (30) is not in use, such as when a ship is anchored at a port or an emergency situation occurs. More preferably, the circulating washing by the filter washing unit (70) may continue for about 1 to 4 hours. Referring to FIG. 7, the filter washing unit (70) includes a washing water circulation unit (71), a fresh water supply unit (72), and a second chemical addition unit (73).

[0126] The above washing water circulation unit (71) refers to a configuration that sprays washing water (F) onto the washing liquid filter unit (32) and recovers and circulates the sprayed washing water. The washing water (F) is a concept that includes all materials used to wash the washing liquid filter unit (32). When only fresh water is supplied and circulated by the fresh water supply unit (72) described later, the fresh water becomes the washing water (F). When a second chemical is added to the fresh water and circulated by the second chemical addition unit (73) described later, the fresh water with the second chemical added becomes the washing water (F). Referring to FIG. 7, the washing water circulation unit (71) includes a washing water spray unit (711), a washing water pipe unit (712), and a washing water pump unit (713).

[0127] The above washing water spray unit (711) refers to a configuration that sprays the washing water (F) onto the washing liquid filter unit (32). Preferably, the washing water spray unit (711) may be a spray nozzle, and as shown in FIG. 7, may be positioned above the washing liquid filter unit (32), may be configured in multiple units, and may be arranged at regular intervals along the washing water conduit unit (712) described below for uniform washing of the washing liquid filter unit (32).

[0128] The above washing water conduit (712) refers to a configuration in which one side is connected to the washing liquid tank (31) and the other side is connected to the washing liquid spraying part (711) to guide the transport of the washing water. The washing liquid filter part (32) can be formed horizontally in a direction perpendicular to the central axis of the washing liquid tank part (31) within the first body part (311) of the washing liquid tank part (31) as illustrated in FIG. 7, and a part of the washing water conduit part (712) can be formed parallel to the washing liquid filter part (32) at a certain distance from the washing liquid filter part (32).

[0129] The above washing water pump unit (713) refers to a configuration formed on the washing water conduit unit (712) and circulating the washing water. The washing water (F) flowing along the washing water conduit unit (712) is sprayed onto the washing liquid filter unit (32) through the washing water spray unit (711), and the washing water (F) collected at the lower side of the washing liquid tank unit (31) after spraying flows out of the washing liquid tank unit (31) by the pump pressure of the washing water pump unit (713) and is recirculated along the washing water conduit unit (712), and the recycled washing water (F) is sprayed onto the washing liquid filter unit (32) again through the washing water spray unit (711), and this process is continuously repeated by the washing water pump unit (713).

[0130] The above fresh water supply unit (72) refers to a configuration that is connected to the washing water conduit unit (712) and supplies fresh water into the washing water conduit unit (712). After the backwashing by the treated water and the CEB repeated at regular intervals, when the inside of the washing liquid tank unit (31) is drained, fresh water is injected into the washing water conduit unit (712) by the fresh water supply unit (72), so that fresh water for washing can be sprayed onto the washing liquid filter unit (32). Referring to FIG. 7, the fresh water supply unit (72) includes a fresh water storage unit (721), a fresh water conduit unit (722), a fresh water pump unit (723), and a fresh water control unit (724).

[0131] The above fresh water storage unit (721) is configured to store fresh water, and the fresh water storage unit (721) is connected to a fresh water conduit unit (722) to be described later, so that the fresh water stored in the fresh water storage unit (721) can be supplied into the washing water conduit unit (712) through the fresh water conduit unit (722). Preferably, a second chemical to be described later is injected into the fresh water, and in order to activate the chemical reaction of the injected second chemical, the temperature of the fresh water can be 45 to 50°C, which is a temperature at which the second chemical has high activity. For this purpose, a separate heating means may be installed in the fresh water storage unit (721), or the temperature control unit (33) described above may be used.

[0132] The above fresh water conduit (722) is configured such that one side is connected to the fresh water storage unit (721) and the other side is connected to the wash water conduit (712), thereby guiding the fresh water stored in the fresh water storage unit (721) to flow to the wash water conduit (712). The fresh water conduit (722) may be connected to a second chemical conduit (732) to be described later.

[0133] The above fresh water pump unit (723) is formed on the fresh water pipe unit (722) and refers to a configuration that allows fresh water stored in the fresh water storage unit (721) to move along the fresh water pipe unit (722).

[0134] The above fresh water control unit (724) refers to a configuration that is connected to the fresh water pump unit (723) and controls the supply of the fresh water. When the concentration of the second chemical contained in the washing water is lower than a pre-planned concentration or higher than the pre-planned concentration during the circulation process of the washing water through the detection means, the fresh water control unit (724) connected to the detection means can automatically control the fresh water pump unit (723) to additionally supply fresh water into the washing water conduit unit (712) or stop the supply of fresh water.

[0135] The second chemical addition unit (73) is configured to be connected to the fresh water conduit (722) and to inject a second chemical to be sprayed onto the cleaning solution filter unit (32) into the fresh water conduit (722). The present invention allows fresh water to be circulated by the washing water circulation unit (71), and injects the second chemical into the circulated fresh water, thereby reducing the amount of chemical used while increasing the effectiveness of membrane cleaning. Referring to Fig. 7, the second chemical addition unit (73) includes a second chemical storage unit (731), a second chemical conduit unit (732), a second chemical pump unit (733), and a second chemical control unit (734).

[0136] The second chemical storage unit (731) above refers to a configuration for storing the second chemical. The second chemical is not limited to a specific chemical substance, but preferably, the second chemical may be H2SO4 and NaOH.

[0137] The second chemical conduit (732) is configured such that one side is connected to the second chemical storage (731) and the other side is connected to the fresh water conduit (722) to guide the transport of the second chemical. According to another embodiment, the second chemical conduit (732) may be directly connected to the wash water conduit (712) instead of the fresh water conduit (722).

[0138] The second chemical pump unit (733) is formed on the second chemical conduit unit (732) and refers to a configuration that moves the second chemical. Through the second chemical pump unit (733), the second chemical stored in the second chemical storage unit (731) can be easily injected into the fresh water.

[0139] The second chemical control unit (734) is a configuration that is connected to the second chemical pump unit (733) and controls the amount of the second chemical to be injected into the fresh water. If the concentration of the second chemical included in the wash water during the circulation process of the wash water is lower than a pre-planned concentration through a detection means, the supply of fresh water is stopped by the fresh water control unit (724), and additional injection of the second chemical may be performed by the second chemical pump unit (733). Conversely, if the concentration of the second chemical included in the wash water is higher than the pre-planned concentration, the supply of fresh water may be performed through the fresh water control unit (724), and the injection of the second chemical by the second chemical pump unit (733) may be blocked.

[0140] The detailed description above is illustrative of the present invention. Furthermore, the above description illustrates and describes preferred embodiments of the present invention, and the present invention can be used in various other combinations, modifications, and environments. In other words, changes or modifications are possible within the scope of the inventive concept disclosed in this specification, the scope equivalent to the written disclosure, and / or the scope of technology or knowledge in the art. The written embodiments illustrate the best possible state for implementing the technical idea of ​​the present invention, and various modifications required for specific application fields and uses of the present invention are also possible. Therefore, the detailed description of the invention above is not intended to limit the present invention to the disclosed embodiments. Furthermore, the appended claims should be construed to include other embodiments.

Claims

1. Includes a water treatment unit for treating the cleaning solution, A water treatment system for purifying contaminated cleaning liquid, characterized in that the water treatment unit includes a cleaning liquid tank unit for storing the cleaning liquid, and a cleaning liquid filter unit located within the cleaning liquid tank unit for filtering the cleaning liquid.

2. In paragraph 1, A water treatment system for purifying a contaminated cleaning solution, characterized in that the cleaning solution filter unit includes a membrane unit that is immersed in the cleaning solution and suctions the cleaning solution located on the outside of the separation membrane into the inner space of the separation membrane to filter the cleaning solution.

3. In paragraph 2, A water treatment system for purifying contaminated cleaning liquid, characterized in that the membrane section filters the cleaning liquid by a total filtration method so that the filtered cleaning liquid, which is treatment water, can be used as reverse-wash water of the membrane section.

4. In paragraph 3, A water treatment system for purifying the contaminated cleaning liquid, characterized in that it includes a treated water transport unit that is connected to the inner space of the membrane section and enables the flow of the treated water so that the treated water located in the inner space can come out of the inner space or the treated water located outside the inner space can enter the inner space.

5. In paragraph 4, A water treatment system for purifying contaminated cleaning liquid, characterized in that the treated water transport unit includes a treated water pipe unit that guides the transport of the treated water, and a treated water pump unit formed on the treated water pipe unit that moves the treated water in both forward and reverse directions.

6. In paragraph 5, A water treatment system for purifying a contaminated cleaning liquid, characterized in that the treated water transport unit includes a treated water storage unit that receives a portion of the treated water moving in the forward direction by the treated water pump unit, stores it as backwash water, and provides the stored treated water during backwashing of the membrane unit.

7. In paragraph 5, A water treatment system for purifying contaminated cleaning liquid, characterized in that the treated water transport unit includes a treated water control unit that is connected to the treated water pump unit and controls the operation of the treated water pump unit to move the treated water in a forward or reverse direction.

8. In paragraph 7, A water treatment system for purifying contaminated cleaning liquid, characterized in that the treatment water control unit includes a purification module that controls the treatment water to move in a forward direction, a reverse module that controls the treatment water to move in a reverse direction, and a control module that is connected at one end to the purification module and at the other end to the reverse module to count the operating time of the purification module and operate the reverse module for a preset period of time after a predetermined period of normal cleaning.

9. In paragraph 8, The above treatment water control unit includes a differential pressure detection module that detects the differential pressure between the inner and outer spaces of the membrane unit, A water treatment system for purifying contaminated cleaning liquid, characterized in that the control module is connected to the differential pressure detection module and operates the purification module if the detected differential pressure is outside the preset differential pressure range, and operates the reverse-purification module if the detected differential pressure is within the preset differential pressure range.

10. In paragraph 5, A water treatment system for purifying a contaminated cleaning liquid, characterized in that the treated water transport unit further includes a first chemical addition unit that injects the first chemical into the treated water when the treated water moves in the reverse direction so that the first chemical can enter the inner space of the membrane unit.

11. In paragraph 10, A water treatment system for purifying a contaminated cleaning liquid, characterized in that the first chemical addition unit includes a first chemical storage unit that stores the first chemical, a first chemical conduit unit having one end connected to the first chemical storage unit and the other end connected to the treatment water conduit unit to guide the transport of the first chemical, a first chemical pump unit formed on the first chemical conduit unit to move the first chemical, and a first chemical control unit that counts the number of backwashing operations and controls the first chemical pump unit to inject the first chemical into the treatment water moving in the reverse direction for backwashing when the number of backwashing operations reaches a preset number of backwashing operations.

12. In paragraph 4, A water treatment system for purifying the contaminated cleaning solution, characterized in that it further includes a treated water recovery unit that is connected to the treated water transport unit and analyzes the treated water and recovers the treated water if the content of the component included in the treated water does not meet the standard.

13. In paragraph 12, A water treatment system for purifying a contaminated cleaning solution, characterized in that the treated water recovery unit includes a recovery judgment unit that analyzes the components of the treated water and determines whether the components of the treated water satisfy the criteria, and a recovery decision unit that is connected to the recovery judgment unit and allows transport by the treated water transport unit if the components of the treated water satisfy the criteria, and blocks transport by the treated water transport unit and allows recovery if the components of the treated water do not satisfy the criteria.

14. In paragraph 13, A water treatment system for purifying contaminated cleaning liquid, characterized in that the above-mentioned recovery determination unit includes a recovery valve unit for controlling the flow of the treated water, a recovery pipe unit for guiding the transfer of the recovered treated water, one side of which is connected to the recovery valve unit and the other side of which is connected to the cleaning solution tank unit, and a recovery pump unit formed on the recovery pipe unit for moving the recovered treated water.

15. In any one of paragraphs 1 to 14, The above cleaning solution tank portion includes a first body portion forming a first chamber, and a second body portion forming a second chamber that is extended to the lower side of the first body portion and communicates with the first chamber, but has a cross-sectional size that becomes smaller as it goes downward. A water treatment system for purifying the contaminated cleaning liquid, characterized in that it includes a slurry treatment unit connected to the second body unit and discharging slurry settled in the second body unit to the outside.

16. In any one of paragraphs 1 to 14, A water treatment system for purifying the contaminated cleaning liquid, characterized in that it includes a cleaning liquid transport unit that supplies the cleaning liquid to the water treatment unit, and a coagulant adding unit that injects a coagulant into the cleaning liquid supplied by being connected to the cleaning liquid transport unit at a front end of the water treatment unit.

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