A treatment system and control method for compound seasoning wastewater

Abstract

The invention relates to the field of wastewater treatment, and discloses a treatment system and a control method for compound seasoning wastewater, wherein the treatment system comprises a collection module, a temporary storage module and a treatment module; the collection module comprises a collection pipe and several collection pipes connected to the upstream of the collection pipe, and the collection pipes are communicated with the wastewater discharge port of the wastewater source equipment; the temporary storage module comprises a temporary storage tank, and the temporary storage tank has a liquid inlet, a liquid discharge port and a lower sewage discharge port, wherein the liquid inlet is located at the upper part of the temporary storage tank and is communicated with the collection pipe, the liquid discharge port is located at the middle and lower part of the temporary storage tank, and the lower sewage discharge port is located at the bottom of the temporary storage tank; the treatment module comprises a pretreatment unit and a main treatment unit, the main treatment unit is connected to the pretreatment unit, the liquid discharge port is communicated with the main treatment unit, and the lower sewage discharge port is communicated with the pretreatment unit; the present invention can realize the centralized collection and reprocessing of wastewater from multiple wastewater source equipment, and the graded treatment of wastewater, thereby reducing the energy consumption and cost of water treatment.

Description

Technical Field

[0001] The present invention relates to the field of wastewater treatment, and in particular to a treatment system and a control method for compound seasoning wastewater. Background Art

[0002] Wastewater treatment is a crucial process in the fields of environmental protection and resource utilization. Effectively treating wastewater to meet discharge standards or enable its reuse is crucial for maintaining ecological balance and conserving resources. In automated compound seasoning processing plants, engineered compound seasonings are typically stir-fried in a closed environment. After stir-frying, the resulting wash water is pumped to a designated location for centralized treatment.

[0003] Currently, the typical approach to treating pot wash water is to perform pretreatment before proceeding to primary treatment. Pretreatment primarily involves methods such as oil separation and sedimentation filtration, while primary treatment involves processes such as controlled coagulation, biochemical separation, or membrane separation. Due to the high cost of operating water treatment processes, companies typically concentrate pot wash water to a certain level before proceeding with water treatment. However, the concentrated pot wash water often contains floating oil or debris on the upper layer, while the lower layer forms a sedimentation layer. This intermediate layer typically enters the primary treatment stage without pretreatment. If all concentrated pot wash water were included in the pretreatment process, energy consumption would inevitably increase significantly, leading to higher overall treatment costs. Summary of the Invention

[0004] Therefore, in order to solve the above-mentioned shortcomings, the present invention provides a treatment system and control method for compound seasoning wastewater, which can realize the centralized collection and reprocessing of wastewater from multiple wastewater source equipment, and can grade the wastewater for treatment, thereby reducing the energy consumption and cost of water treatment.

[0005] In one aspect, the present invention provides a system for treating composite seasoning wastewater, comprising a collection module, a temporary storage module, a treatment module, and a monitoring module;

[0006] The collection module includes a collection pipe and a plurality of collection pipes connected to the upstream of the collection pipe, and the collection pipes are connected to the wastewater outlet of the wastewater source equipment;

[0007] The temporary storage module includes a temporary storage tank having a liquid inlet, a liquid outlet and a lower sewage outlet, wherein the liquid inlet is located at the upper part of the temporary storage tank and is connected to the collecting pipe, the liquid outlet is located in the middle and lower part of the temporary storage tank, and the lower sewage outlet is located at the bottom of the temporary storage tank;

[0008] The treatment module includes a pretreatment unit and a main treatment unit, wherein the pretreatment unit performs oil separation and / or coagulation sedimentation treatment on the wastewater, and the main treatment unit performs biochemical treatment or ultrafiltration treatment on the wastewater; the main treatment unit is connected to the pretreatment unit, the liquid discharge port is connected to the main treatment unit, and the lower sewage discharge port is connected to the pretreatment unit;

[0009] The monitoring module includes a controller, a temperature sensor, a liquid level sensor and a pressure sensor group. The pressure sensor group includes pressure sensors arranged in the temporary storage tank, the upper part of the collecting pipe, and the lower part of the collecting pipe; the temperature sensor is installed in the collecting pipe, and the liquid level sensor is installed in the temporary storage tank to obtain the liquid level height of the temporary storage tank. The controller obtains the signals obtained by each sensor and controls the valves installed in each pipe and the power equipment that drives the flow of wastewater according to the control logic.

[0010] Optionally, the temporary storage tank includes a cover plate, and a nozzle for spraying hot water toward the inner wall of the temporary storage tank is provided on the inner bottom of the cover plate. The nozzle is connected to a flushing liquid source, and the flushing liquid source is provided with a dosing unit.

[0011] Optionally, a plurality of nozzles are arranged circumferentially on the inner bottom of the cover plate, or a rotatable nozzle is arranged below the cover plate.

[0012] Optionally, the collecting pipe has a heating unit installed in the lower half of the collecting pipe, and the collecting pipe is provided with a dosing unit.

[0013] On the other hand, the present invention also provides a method for controlling a compound seasoning wastewater treatment system, which is used to control the above-mentioned compound seasoning wastewater treatment system. The control method includes:

[0014] S100, according to the sewage discharge signal, the wastewater discharged from each wastewater source equipment is collected into the collection pipe through the collection pipe, and then enters the temporary storage tank;

[0015] S200: The controller executes control logic based on real-time parameters to discharge the wastewater in the temporary storage tank into the main treatment unit through the drain port or into the pretreatment unit through the lower drain port;

[0016] The real-time parameters include the real-time pressure value, the real-time liquid level value and the temporary storage time in the temporary storage tank.

[0017] Optionally, the control logic includes:

[0018] When the real-time liquid level height value is greater than or equal to the maximum liquid level threshold, the liquid in the temporary storage tank is discharged through the lower sewage outlet and the liquid discharge outlet. The liquid discharged from the lower sewage outlet enters the pretreatment unit, and the liquid discharged from the liquid discharge outlet enters the main treatment unit.

[0019] When the real-time liquid level in the temporary storage tank is greater than the first liquid level threshold and less than or equal to the second liquid level threshold, the liquid in the temporary storage tank is discharged into the main processing unit only through the drain port; the first liquid level threshold is when the liquid level in the temporary storage tank is above the drain port, and the second liquid level threshold is greater than the first liquid level threshold and less than the maximum liquid level threshold;

[0020] When the wastewater storage time reaches the set time, the liquid in the temporary storage tank is discharged only through the lower sewage outlet, and the sewage discharge time is T, which is determined by the following formula:

[0021] T=λT 标准 ;

[0022] Where: T 标准 It is the time it takes for the corresponding volume of water to be completely discharged through the lower sewage outlet when the water level in the temporary storage tank reaches the first liquid level threshold. λ is the correction coefficient, and its value range is [0.9-1.1].

[0023] When the real-time pressure value exceeds the preset pressure value, the collection pipe is stopped from discharging wastewater into the temporary storage tank, and all the wastewater in the temporary storage tank is discharged into the pretreatment unit only through the lower sewage outlet.

[0024] Optionally, the maximum liquid level threshold is determined as follows:

[0025] H max =σH 标准 ;

[0026] Among them: H max is the maximum liquid level threshold, H 标准 is the standard capacity of the temporary storage tank, σ is the adjustment coefficient, and the value range of the adjustment coefficient is [0.8, 0.9].

[0027] In one embodiment, the real-time parameters also include the upper pressure value and the lower pressure value of the collection pipe, and the control logic also includes judging whether the collection pipe is blocked by the pressure difference ΔP, where ΔP=|P 上部 -P 下部 ∣;

[0028] When 0<△P≤A, the heating unit of the collecting pipe is started to heat to the set temperature; where A is a constant and the value is determined based on usage experience.

[0029] When A < △P, the wastewater source equipment stops discharging wastewater, and hot water with chemicals is introduced into the collection pipe through the collection pipe until the collection pipe is unblocked.

[0030] Optionally, the real-time parameter further includes a temperature value of the lower half of the collection pipeline, and the control logic further includes:

[0031] When the temperature of the lower half of the collecting pipe is lower than the preset temperature, the heating unit of the collecting pipe is started, and the heating is stopped after the lower half of the collecting pipe reaches the specified temperature.

[0032] Optionally, the control method further includes:

[0033] S300, regularly cleaning the temporary storage tank.

[0034] The present invention has the following advantages:

[0035] The present invention relates to a treatment system and control method for compound seasoning wastewater. The system collects wastewater from multiple wastewater source equipment (such as woks, especially closed woks) in a temporary storage tank, and controls the discharge of the wastewater in the temporary storage tank, thereby achieving hierarchical treatment of the wastewater and reducing the energy consumption and cost of water treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the structure of the compound seasoning wastewater treatment system of the present invention;

[0037] Figure 2 It is a schematic diagram of the three-dimensional structure of the temporary storage tank of the present invention;

[0038] Figure 3 This is a schematic diagram of the main view of the temporary storage tank of the present invention;

[0039] Figure 4 is a side view schematic diagram of the temporary storage tank of the present invention;

[0040] Figure 5 yes Figure 4 Schematic diagram of the cross section of AA ( Figure 5 A is the liquid level indicated by the first liquid level threshold, B is the liquid level indicated by the second liquid level threshold, and C is the liquid level indicated by the maximum liquid level threshold);

[0041] Figure 6 This is a schematic diagram of the cover structure of the temporary storage tank of the present invention;

[0042] Figure 7 It is a schematic diagram of the filter screen result of the present invention;

[0043] Figure 8 This is a schematic diagram of the collecting pipeline of the present invention;

[0044] Figure 9 1 is a flow chart of a control method for a treatment system of composite seasoning wastewater according to the present invention;

[0045] In the figure: 100, wastewater source equipment; 200, temporary storage module; 201, temporary storage tank; 202, cover plate; 203, liquid inlet; 204, liquid discharge port; 205, lower sewage outlet; 206, filter screen; 207, nozzle; 208, ring rack; 300, collection module; 301, collection pipe; 302, collection pipe; 400, processing module; 500, monitoring module; 600, heating unit. DETAILED DESCRIPTION

[0046] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0047] In this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "includes," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0048] As described in the background technology, the current treatment method for pot wash water is generally to first perform pretreatment, and then carry out main treatment. Pretreatment mainly uses methods such as oil separation, sedimentation and filtration; main treatment includes processes such as adjustment coagulation, biochemical or membrane separation. Due to the high cost of running water treatment processes, companies usually concentrate pot wash water to a certain level before carrying out water treatment. The upper layer of concentrated pot wash water contains floating oil or floating objects, and the lower layer forms a sediment layer. During the water treatment process, the middle layer usually does not require pretreatment and can directly enter the main treatment stage. If all concentrated pot wash water is included in the pretreatment process, it will inevitably increase the energy consumption of the pretreatment link, which will lead to an increase in the overall treatment cost.

[0049] Based on the above reasons, this embodiment provides a system for treating compound seasoning wastewater, such as Figure 1 As shown, the processing system includes a collection module 300, a temporary storage module 200, a processing module 400 and a monitoring module 500;

[0050] The collection module includes a collection pipe 302 and several collection pipes 301 connected to the upstream of the collection pipe. The collection pipe 301 is connected to the wastewater outlet of the wastewater source equipment 100 (for example, a closed frying pan of the wastewater source equipment, and the wastewater is pot washing water). The connection between the collection pipe and the collection pipe has an expanded diameter portion, and the inner wall of the expanded diameter portion smoothly transitions to the inner wall of the collection pipe. A valve is provided at the discharge end of the collection pipe.

[0051] like Figure 2-Figure 5 As shown, the temporary storage module 200 includes a temporary storage tank 201, which has a liquid inlet 203, a liquid outlet 204 and a lower sewage outlet 205, wherein the liquid inlet 203 is located at the upper part of the temporary storage tank and is connected to the collecting pipe 302, several of the collection pipes 301 converge and are connected to the collecting pipe 302, the liquid outlet 204 is located in the middle and lower part of the temporary storage tank, and the lower sewage outlet 205 is located at the bottom of the temporary storage tank.

[0052] The processing module 400 includes a pre-processing unit 401 and a main processing unit 402 (such as Figure 1 As shown), the pretreatment unit performs oil separation and / or coagulation sedimentation treatment on the wastewater, and the main treatment unit performs biochemical treatment or ultrafiltration treatment on the wastewater; the discharge port is connected to the main treatment unit, and the wastewater in the middle of the temporary storage tank is treated by the main treatment unit (the wastewater in the middle of the temporary storage tank discharged from the discharge port contains less oil and sediment, and does not need to be processed through the whole process in water treatment, so it does not need to be processed by the pretreatment unit), the lower sewage outlet is connected to the pretreatment unit, and the wastewater containing sediment and oil in the temporary storage tank is treated in sequence by the pretreatment unit and the main treatment unit (the wastewater discharged from the lower sewage outlet contains oil and sediment, and in the water treatment process, needs to be processed through the whole process, so it needs to be pretreated by the pretreatment unit first, and then processed by the main treatment unit);

[0053] The monitoring module 500 includes a controller, a temperature sensor, a liquid level sensor and a pressure sensor group, wherein the pressure sensor group includes pressure sensors arranged in the temporary storage tank, the upper part of the collecting pipe and the lower part of the collecting pipe; the temperature sensor is installed in the collecting pipe, and the liquid level sensor is installed in the temporary storage tank to obtain the liquid level height of the temporary storage tank. The controller obtains the signals obtained by each sensor and controls the valves installed in each pipe and the power equipment for driving the flow of wastewater (such as pumps, or driving the flow of wastewater by negative pressure) according to the control logic, wherein the wastewater enters the temporary storage tank through the collection pipe and the collecting pipe, and the flow of wastewater is driven by negative pressure; and the wastewater coming out of the lower sewage outlet and the liquid discharge outlet enters the treatment module through a pump and / or gravity.

[0054] The above technical features can realize the centralized collection and treatment of pot washing water. The pot washing water from multiple wastewater source equipment (woks or closed woks) is collected into the collection pipe and discharged into the temporary storage tank. The pot washing water is collected by the temporary storage tank, and the wastewater discharged from different positions in the temporary storage tank is treated in different ways, thereby improving the wastewater treatment efficiency and reducing the wastewater treatment cost. At the same time, the controller can use the signals obtained by each sensor and control the drainage position of the temporary storage tank according to the control logic to achieve accurate discharge of wastewater.

[0055] In one embodiment, the pretreatment method of the pretreatment unit includes a grease trap and a sedimentation tank, and the sedimentation tank is connected to the water outlet of the grease trap. The specific pretreatment process is as follows:

[0056] The pretreatment adopts the method of oil separation + coagulation and sedimentation, in which the oil separator adopts flotation (dissolved air flotation or vortex flotation), adding PAC and PAM to remove grease (efficiency ≥90%), SS (efficiency ≥80%) and part of COD (efficiency 30%-40%).

[0057] The sedimentation tank is an inclined tube sedimentation tank or a radial flow sedimentation tank with a residence time of 2-3 hours to further remove suspended solids, and the effluent SS is ≤100 mg / L.

[0058] In one embodiment, the main treatment unit comprises an anaerobic tank, an aerobic tank and a sludge treatment device, and the main treatment method is biochemical treatment;

[0059] Exemplarily, the biochemical treatment includes:

[0060] The retention time in the anaerobic tank is 6-8h, which degrades macromolecular organic matter and improves biodegradability (B / C ratio increases from 0.3 to 0.5).

[0061] The residence time in the aerobic tank is 12-16 hours, and the activated sludge method or biofilm method (such as packed contact oxidation) is used to remove COD (efficiency ≥80%) and ammonia nitrogen (efficiency ≥90%), with the effluent COD ≤300 mg / L and ammonia nitrogen ≤25 mg / L.

[0062] The sludge is then treated by sludge treatment equipment. After the sludge in the sedimentation tank is concentrated, it is dehydrated by a plate and frame filter press, and the mud cake is transported out for disposal.

[0063] The sewage treated by the main treatment method described in this embodiment can achieve the third-level discharge standard.

[0064] Since the pot washing water contains detergent residues, such as surfactants (such as LAS), which may inhibit the activity of microorganisms, a pre-activated carbon adsorption unit is added in front of the anaerobic tank. A salt-tolerant alkaliphilic bacteria agent (Halomonas genus) is added to the pre-activated carbon adsorption unit to remove the surfactant. The Halomonas genus is a salt-tolerant alkaliphilic bacteria agent that can tolerate an environment of pH 9-10 and a salinity of 3%. It is acclimated and cultured in the laboratory according to the target wastewater quality before construction.

[0065] In one embodiment, in order to achieve wastewater reuse, the main treatment method is deep treatment:

[0066] Colloids, microorganisms and macromolecular organic matter are removed through ultrafiltration (UF) process, with a molecular weight cut-off of 50,000-100,000 Da and an effluent turbidity of ≤0.5 NTU.

[0067] The reverse osmosis (RO) process is then used to achieve a desalination rate of ≥95%, remove dissolved organic matter and ions, and achieve effluent COD ≤50mg / L and conductivity ≤100μS / cm, meeting the cleaning water quality requirements (such as turbidity ≤1NTU, pH=6-9).

[0068] In one embodiment, if Figure 6 As shown, the temporary storage tank 201 includes a cover plate 202, and a nozzle 207 is provided on the inner bottom of the cover plate 202 to spray hot water toward the inner wall of the temporary storage tank. The nozzle is connected to a flushing liquid source, which is provided with a dosing unit. The flushing liquid source is high-temperature hot water.

[0069] A filter screen 206 (such as Figure 5 As shown), the filter 206 is made of an oleophobic material or has an oleophobic layer on its outer surface. The specific structure of the filter is a mesh structure, such as Figure 7 shown.

[0070] Optionally, a plurality of nozzles 207 are provided on the inner bottom of the cover plate 202, or a rotatable nozzle is provided below the cover plate; Figure 6 As shown, several of the nozzles 207 are installed through an annular frame 208, and the annular frame 208 is fixed to the cover plate 202 through supporting legs.

[0071] The above technical features facilitate the cleaning of the inner wall of the temporary storage tank by workers. The inner wall can be cleaned and rinsed with hot water or hot water with detergent, preventing the pot washing water from staying in the temporary storage tank for a long time and causing spoilage and fermentation. The dosing unit can be used to add flushing agents or other substances that help the pot washing water decompose. The addition of these substances not only facilitates the cleaning of the temporary storage tank, but also allows the nozzle to be controlled by a controller to regularly spray the substance that helps the pot washing water decompose (this substance can be pre-stored in the dosing unit) into the temporary storage tank to achieve preliminary treatment of the liquid in the temporary storage tank. The wastewater after preliminary treatment can be discharged through the drain port, reducing the processing capacity of the pretreatment unit in the treatment module. At the same time, an oleophobic filter is provided at the liquid inlet end of the drain port (i.e., the port located on the inner wall of the temporary storage tank), which can achieve preliminary filtration of the liquid discharged from the drain port, achieving a simple pretreatment effect and reducing the load on the main treatment unit.

[0072] Although the pot-washing water is mostly hot water, it needs to pass through the collection pipe before entering the collection pipe. The collection pipe and the collection pipe are often made of stainless steel pipes in the workshop, so they have strong heat dissipation capacity. In addition, when the collection pipe is long, the temperature of the pot-washing water entering the collection pipe varies greatly, especially in the lower half of the collection pipe, or when the amount of pot-washing water is discontinuous or too little, the lower half of the collection pipe is prone to oil solidification on the pipe wall (especially when the wok is used to process beef hot pot base, the wok is only rinsed with hot water in the early stage. Such pot-washing water contains beef tallow, and the temperature of the beef tallow gradually decreases when it flows from the collection pipe to the collection pipe. In the lower half of the collection pipe, the beef tallow is easily solidified on the pipe wall, thereby affecting the fluidity of the pot-washing water in the collection pipe). Therefore, in order to overcome this problem, in one embodiment, Figure 8 As shown, the collecting pipe 302 has a heating unit 600, which is installed in the lower half of the collecting pipe. A valve is provided at the liquid outlet of the collecting pipe or the liquid inlet of the temporary storage tank, and the collection pipe is provided with a dosing unit.

[0073] In the above technical features, the collecting pipe can be heated by the heating unit, especially when oil stains adhere to the inner wall of the collecting pipe and solidify, causing the collecting pipe to be blocked, the heating can help to clear the collecting pipe. If necessary, a certain amount of clearing agent can be added to the collecting pipe through the dosing unit. At the same time, a valve is set at the liquid outlet of the collecting pipe or the liquid inlet of the temporary storage tank to control whether the pot washing water is discharged into the temporary storage tank. At the same time, when all wastewater source equipment (woks or closed woks) are not discharging wastewater, the lower end of the collecting pipe is closed to prevent odorous gases in the temporary storage tank from entering the collection pipe or the collecting pipe under pressure. Because during the maintenance of the wok, the drain valve (i.e., the valve that controls whether the pot washing water enters the collection pipe) may be opened. If there is odorous gas in the collection pipe, it will affect the cleanliness of the maintenance personnel or the wok. The position of the valve can also minimize the impact of the valve on the fluidity of the liquid to avoid blockage at the valve.

[0074] In another embodiment, a control method for a compound seasoning wastewater treatment system is provided, which is used to control the above-mentioned compound seasoning wastewater treatment system. Figure 9 As shown, the control method includes:

[0075] S100, according to the sewage discharge signal, the wastewater discharged from each wastewater source equipment (such as a wok or a closed wok) is collected into a collection pipe through a collection pipe, and then enters a temporary storage tank;

[0076] S200: The controller executes control logic based on real-time parameters to discharge the wastewater in the temporary storage tank into the main treatment unit through the drain port or into the pretreatment unit through the lower drain port;

[0077] The real-time parameters include the real-time pressure value, the real-time liquid level value and the temporary storage time in the temporary storage tank.

[0078] Exemplarily, the control logic includes:

[0079] When the real-time liquid level height value is greater than or equal to the maximum liquid level threshold, the liquid in the temporary storage tank is discharged through the lower sewage outlet and the liquid discharge outlet. The liquid discharged from the lower sewage outlet enters the pretreatment unit, and the liquid discharged from the liquid discharge outlet enters the main treatment unit.

[0080] When the real-time liquid level in the temporary storage tank is greater than a first liquid level threshold and less than or equal to a second liquid level threshold, the liquid in the temporary storage tank is discharged into the main processing unit only through the drain port. At the first liquid level threshold, the liquid level in the temporary storage tank is above the drain port (setting the first liquid level threshold ensures that the liquid discharged from the drain port is below the floating oil. Since the surface of the liquid in the temporary storage tank may be floating oil, setting the first threshold can reduce the possibility of floating oil entering the main processing unit). The second liquid level threshold is greater than the first liquid level threshold and less than the maximum liquid level threshold (using the second liquid level threshold to achieve classified discharge of the liquid in the temporary storage tank).

[0081] When the wastewater temporary storage time (the wastewater temporary storage time can be determined by the time when the lower sewage outlet is not discharged, or the time when the valve at the lower sewage outlet is closed, or the time when the pump between the lower sewage outlet and the pretreatment module is not working) reaches the set time, the liquid in the temporary storage tank is discharged only through the lower sewage outlet, and the drainage time is T, which is determined by the following formula:

[0082] T=λT 标准 ;

[0083] Where: T 标准 It is the time it takes for the corresponding volume of water to be completely discharged through the lower sewage outlet when the water level in the temporary storage tank reaches the first liquid level threshold. λ is the correction coefficient. Since the fluidity of the discharged wastewater and the pressure in the temporary storage tank will affect the discharge time of the wastewater, the time is corrected by λ, and the value range of λ is [0.9-1.1].

[0084] Among the above technical features, the introduction time T can realize the complete discharge of wastewater that has stayed in the temporary storage tank for a long time (because when the wastewater level is below the first liquid level threshold and the pressure does not exceed the threshold, it is easy to be stored for a long time). The purpose of discharging the wastewater only through the lower sewage outlet is to prevent the floating oil on the surface of the wastewater from entering the drain port. At the same time, after a certain period of storage, the pot washing water will become corrupt, etc., and needs to go through the full steps of the processing module, that is, first through pretreatment and then through main treatment.

[0085] When the real-time pressure value exceeds the preset pressure value (indicating that the pot washing water has undergone strong fermentation and needs to be discharged and treated in time), the collection pipe is suspended from discharging wastewater into the temporary storage tank, and all the wastewater in the temporary storage tank is discharged into the pretreatment unit only through the lower sewage outlet. After strong fermentation occurs, the pot washing water needs to go through all the steps of the treatment module, that is, first through the pretreatment unit and then through the main treatment unit.

[0086] In one embodiment, the maximum liquid level threshold is determined as follows:

[0087] H max =σH 标准 ;

[0088] Among them: H max is the maximum liquid level threshold, H 标准 is the standard capacity of the temporary storage tank, σ is the adjustment coefficient, and the value range of the adjustment coefficient is [0.8, 0.9]. The adjustment coefficient can ensure that the maximum liquid level threshold is less than the standard capacity of the temporary storage tank, so that the temporary storage tank always has space, thereby ensuring that the liquid in the collecting pipe can smoothly enter the temporary storage tank; at the same time, the integer coefficient is a value range, not a fixed value, because the different environments (especially temperature) where the temporary storage tank is placed will affect the fermentation of the wastewater in the temporary storage tank, and the expansion of the wastewater at different temperatures will also change. Therefore, in a high temperature environment, σ can be taken as 0.8, and if the temperature is relatively low, σ can be taken as 0.9.

[0089] In one embodiment, the real-time parameters also include the upper pressure value and the lower pressure value of the collection pipe (as shown in the figure), and the control logic further includes: judging whether the collection pipe is blocked by the pressure difference ΔP, where ΔP=|P 上部 -P 下部 ∣.

[0090] When 0<△P≤A, it appears that there is a certain degree of blockage in the collecting pipe. This may be manifested in that the temperature of the lower half of the collecting pipe is not high, and the oil (especially the pot washing water containing butter) solidifies, affecting the fluidity of the collecting pipe. In this case, the heating unit of the collecting pipe is started and heated to the set temperature (especially the lower half of the collecting pipe is heated to improve the fluidity of the oil and improve the blockage). Where A is a constant, and the value is determined based on usage experience.

[0091] When A<△P, it means that the blockage has occurred. The wastewater source equipment is stopped from discharging wastewater, and a reagent is introduced into the collection pipe through the collection pipe. The collection pipe is unblocked by the reagent and hot water until the collection pipe is unblocked.

[0092] The above technical features can monitor whether the collecting pipe is blocked, and adopt corresponding methods to clear the collecting pipe according to the blockage situation.

[0093] In one embodiment, the real-time parameter also includes a temperature value of the lower half of the collecting pipe. The control logic further includes: determining whether to heat the lower half of the collecting pipe based on the temperature of the lower half of the collecting pipe. This is because pot washing water generally has a temperature. Although it enters the collecting pipe through the collection pipe, the temperature gradually decreases from the collection pipe to the collecting pipe. In the lower half of the collecting pipe, the fluidity of wastewater containing a floating oil layer (especially tallow) may be reduced due to the temperature drop. Therefore, the lower half of the collecting pipe is heated by the heating unit to overcome the problem of wastewater fluidity being affected by the temperature drop.

[0094] Exemplarily, when the temperature value of the lower half of the collecting pipe (the temperature value of the lower end of the collecting pipe can be collected as the temperature value of the lower half, as shown in the figure) is lower than the preset temperature value, the heating unit of the collecting pipe is started, and the collecting pipe is heated by the heating unit until the specified temperature is reached, and then the heating is stopped.

[0095] In one embodiment, if Figure 9 As shown, the control method further includes:

[0096] S300, regularly cleaning the temporary storage tank; depending on the nature of the wastewater, the temporary storage tank needs to be cleaned at a specified period (for example, every certain number of days). The specific cleaning method is as follows:

[0097] When the cleaning cycle is reached, stop discharging wastewater into the temporary storage tank and only discharge all wastewater in the temporary storage tank through the lower sewage outlet. After the wastewater is discharged, close the lower sewage outlet and the liquid outlet, start the nozzle, and spray the flushing liquid with temperature and chemicals (substances that are conducive to the decomposition of oil) onto the inner wall of the temporary storage tank through the nozzle until the specified time. The flushing liquid is used to clean the temporary storage tank. The flushing liquid with temperature and chemicals can remove the oil attached to the inner wall of the temporary storage tank (especially the butter in the pot washing water).

[0098] In the above technical features, the cleaning cycle is different from the wastewater temporary storage time in step S200. The wastewater temporary storage time is set by technical personnel or management personnel based on the nature of the wastewater (determined by the different materials processed in the wok, such as the proportion of wastewater containing more butter, more vegetable oil, or more perishable substances); while the cleaning cycle is considered based on the overall situation. For example, mandatory cleaning is required every week, regardless of the nature of the wastewater; and the cleaning cycle must be greater than the wastewater temporary storage time.

[0099] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A system for treating compound seasoning wastewater, characterized by: It includes collection module, temporary storage module, processing module and monitoring module; The collection module includes a collection pipe and a plurality of collection pipes connected to the upstream of the collection pipe, and the collection pipes are connected to the wastewater outlet of the wastewater source equipment; The temporary storage module includes a temporary storage tank having a liquid inlet, a liquid outlet and a lower sewage outlet, wherein the liquid inlet is located at the upper part of the temporary storage tank and is connected to the collecting pipe, the liquid outlet is located in the middle and lower part of the temporary storage tank, and the lower sewage outlet is located at the bottom of the temporary storage tank; The treatment module includes a pretreatment unit and a main treatment unit, wherein the pretreatment unit performs oil separation and / or coagulation sedimentation treatment on the wastewater, and the main treatment unit performs biochemical treatment or ultrafiltration treatment on the wastewater; the main treatment unit is connected to the pretreatment unit, the liquid discharge port is connected to the main treatment unit, and the lower sewage discharge port is connected to the pretreatment unit; The monitoring module includes a controller, a temperature sensor, a liquid level sensor, and a pressure sensor group. The pressure sensor group includes pressure sensors installed in the temporary storage tank, on the upper part of the collecting pipe, and on the lower part of the collecting pipe. The temperature sensor is installed in the collecting pipe, and the liquid level sensor is installed in the temporary storage tank to obtain the liquid level height of the temporary storage tank. The controller obtains the signals obtained by each sensor and controls the valves installed in each pipe and the power equipment that drives the flow of wastewater according to the control logic. The control method of the system includes: According to the sewage discharge signal, the wastewater discharged from each wastewater source equipment is collected into the collection pipe through the collection pipe, and then enters the temporary storage tank; The controller executes control logic based on real-time parameters to discharge the wastewater in the temporary storage tank into the main treatment unit through the drain port or into the pretreatment unit through the lower drain port; the real-time parameters include the real-time pressure value, real-time liquid level value and temporary storage time in the temporary storage tank; The control logic includes: When the real-time liquid level height value is greater than or equal to the maximum liquid level threshold, the liquid in the temporary storage tank is discharged through the lower sewage outlet and the liquid discharge outlet. The liquid discharged from the lower sewage outlet enters the pretreatment unit, and the liquid discharged from the liquid discharge outlet enters the main treatment unit. When the real-time liquid level in the temporary storage tank is greater than the first liquid level threshold and less than or equal to the second liquid level threshold, the liquid in the temporary storage tank is discharged into the main processing unit only through the drain port; the first liquid level threshold is when the liquid level in the temporary storage tank is above the drain port, and the second liquid level threshold is greater than the first liquid level threshold and less than the maximum liquid level threshold; When the wastewater storage time reaches the set time, the liquid in the temporary storage tank is discharged only through the lower sewage outlet, and the sewage discharge time is T, which is determined by the following formula: T=λT 标准 ; Where: T 标准 is the time it takes for the corresponding volume of water in the temporary storage tank to be completely discharged through the lower sewage outlet when the water level in the temporary storage tank reaches the first liquid level threshold. λ is the correction coefficient, and its value range is [0.9-1.1]. When the real-time pressure value exceeds the preset pressure value, the collection pipe is stopped from discharging wastewater into the temporary storage tank, and all the wastewater in the temporary storage tank is discharged into the pretreatment unit only through the lower sewage outlet.

2. The system for treating compound seasoning wastewater according to claim 1, characterized in that: The temporary storage tank comprises a cover plate, and a nozzle for spraying hot water toward the inner wall of the temporary storage tank is arranged on the inner bottom of the cover plate. The nozzle is connected to a flushing liquid source, and the flushing liquid source is provided with a dosing unit.

3. The system for treating compound seasoning wastewater according to claim 1, characterized in that: The collecting pipe has a heating unit installed in the lower half of the collecting pipe, and a valve is provided at the liquid outlet end of the collecting pipe.

4. The system for treating composite seasoning wastewater according to claim 1, characterized in that: The collection pipeline is provided with a dosing unit.

5. The system for treating compound seasoning wastewater according to claim 1, characterized in that: The maximum liquid level threshold is determined as follows: H max =σH 标准 ; Among them: H max is the maximum liquid level threshold, H 标准 is the standard capacity of the temporary storage tank, σ is the adjustment coefficient, and the value range of the adjustment coefficient is [0.8, 0.9].

6. The system for treating compound seasoning wastewater according to claim 1, characterized in that: The real-time parameters also include the upper pressure value and the lower pressure value of the collection pipe, and the control logic also includes judging whether the collection pipe is blocked by the pressure difference ΔP, where ΔP=|P 上部 -P 下部 ∣; When 0<△P≤A, the heating unit of the collecting pipe is started to heat to the set temperature; Where A is a constant, and its value is determined based on usage experience; When A < △P, the wastewater source equipment stops discharging wastewater, and hot water with chemicals is introduced into the collection pipe through the collection pipe until the collection pipe is unblocked.

7. The system for treating compound seasoning wastewater according to claim 1, characterized in that: The real-time parameters also include the temperature value of the lower half of the collection pipeline, and the control logic also includes: When the temperature of the lower half of the collecting pipe is lower than the preset temperature, the heating unit of the collecting pipe is started, and the heating is stopped after the lower half of the collecting pipe reaches the specified temperature.

8. The system for treating compound seasoning wastewater according to claim 1, characterized in that: The method also includes regularly cleaning the temporary storage tank.

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