Cooperative treatment method and system for food wastewater and domestic sewage

Abstract

The invention belongs to the technical field of sewage treatment, and particularly relates to a food wastewater and domestic sewage cooperative treatment method and system. According to the characteristics of suspended solids in the food wastewater, through combination of different flocculants and coagulant aids, the suspended solids in the wastewater are effectively separated, the load of a subsequent biochemical system is reduced, and the treatment effect of a food wastewater process is remarkably improved; suspended matters in the food wastewater or organic matters in the wastewater are decomposed and stabilized, and are used as a carbon source of a domestic sewage plant, so that the denitrification rate is equivalent to that of glucose, and effective utilization of resources is realized; waste heat in the food wastewater is used for heat preservation of the hydrolysis pool through the heat pump exchange device, the energy utilization efficiency is improved, and the operation cost and the carbon emission are reduced; by means of the system, the food-domestic wastewater treatment process is combined, food-domestic wastewater is cooperatively treated, and regional pollution and carbon reduction and resource recycling are jointly achieved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of sewage treatment, and particularly relates to a food wastewater and domestic sewage collaborative treatment method and system. BACKGROUND

[0002] With the continuous improvement of people's living standards, the meat, egg, milk, and soybean food processing industry is developing continuously, and the resulting sewage is also increasing. The sewage produced by the food industry often has high contents of organic matter, total phosphorus, and total nitrogen. Organic matter and nutrients can cause the imbalance of oxidation-reduction homeostasis, causing water body hypoxia, thereby adversely affecting the aquatic ecosystem. After entering the water body, organic matter and nutrients can promote the massive reproduction of algae in the water body, causing red tide, which not only destroys the water ecological balance but also can harm fishery resources and cause economic losses. If not effectively treated, it will seriously endanger the safety of the surrounding ecological environment.

[0003] For food industry wastewater, the existing treatment processes are mostly focused on chemical methods, physical and chemical methods, and biological methods. In actual engineering, multiple treatment methods are often used in combination to achieve better treatment effects. However, in these methods, food wastewater is directly treated as "waste", resulting in the waste of a large amount of organic matter and other resources contained in food wastewater. On the one hand, food wastewater is difficult to treat and it is difficult to meet the standards, and the wastewater contains a large amount of resources. On the other hand, municipal sewage plants often need to add a large amount of carbon source due to low inflow COD concentration. Therefore, it is urgent to develop a new sewage treatment mode to integrate the resources of food plants and domestic sewage plants to achieve mutual benefit and win-win of both.

[0004] In view of this, the present application is proposed. SUMMARY

[0005] In view of the above problems, the purpose of the present application is to provide a food wastewater and domestic sewage collaborative treatment method and system, aiming to improve the efficiency of wastewater treatment and resource utilization and realize regional collaborative carbon reduction and pollution reduction.

[0006] To this end, the first technical solution of the present application discloses a food wastewater and domestic sewage collaborative treatment method, comprising the following steps:

[0007] Separating the solid and supernatant from the pretreated food wastewater;

[0008] Stably treating the hydrolysate obtained by hydrolyzing the solid, to obtain a hydrolysate with stable chemical properties;

[0009] Adding the stably treated hydrolysate into domestic sewage as a liquid carbon source for domestic sewage treatment;

[0010] The pretreatment is flocculation treatment and air floatation treatment, the supernatant after treatment is food wastewater, which is used for subsequent wastewater treatment, and the suspended matter and the precipitate are solid matters.

[0011] Further, the coagulant for the flocculation treatment is one or more of poly-gamma-glutamic acid or chitosan, polyacrylamide, lime milk, the flocculant is one or more of polymeric ferric sulfate, polymeric ferric chloride and polymeric ferric aluminum, the stabilizer for the stabilization treatment is any one or a combination of polyethylene glycol, EDTA and phenyl acetate, and the concentration of the stabilizer is 1-5 mmol / L.

[0012] Further, the protein hydrolysis temperature is 40-50 DEG C, the hydrolysis time is 4-5 h, and the hydrolysis pH is 7-8.5.

[0013] Further, the protease for the protein hydrolysis is alkaline protease, and the addition amount is 3-5 mg / g; the protein in the food wastewater is decomposed into small molecule polypeptides, amino acids and the like, so as to facilitate serving as a microbial carbon source.

[0014] Further, the stabilizer for the stabilization treatment is any one or a combination of polyethylene glycol, EDTA and phenyl acetate, the concentration of the stabilizer is 1-5 mmol / L, and after hydrolysis, the addition of a trace amount of stabilizer can inhibit the aggregation of polypeptides and amino acids, can adjust biocompatibility, improve thermal stability and resist further degradation of protease.

[0015] Further, the subsequent treatment process of the food wastewater separated by the pretreatment is: after anaerobic biochemical treatment, aerobic biochemical treatment and advanced treatment, the food wastewater reaches the discharge standard.

[0016] Further, the subsequent treatment process of the domestic wastewater to which the liquid carbon source is added is: after pretreatment, biochemical treatment and advanced treatment, the domestic wastewater reaches the discharge standard.

[0017] The second technical solution of the application discloses a food wastewater and domestic wastewater collaborative treatment system, which is used for realizing the above wastewater treatment process, and comprises:

[0018] The food wastewater pretreatment system comprises a flocculation tank and an air floatation tank, and is used for precipitating and separating suspended matters;

[0019] The suspended matter treatment system comprises a protein hydrolysis tank and a hydrolysis liquid stabilization tank, and is used for hydrolyzing and stabilizing the solid matters separated after the pretreatment.

[0020] Furthermore, the food wastewater pretreatment system and suspended solids treatment system are also equipped with a wastewater waste heat recovery and utilization device, including a high-temperature wastewater tank, a cold water tank, a heat exchanger, a heat pump unit, branched heating pipes at the bottom of the hydrolysis tank, a temperature sensor for the hydrolysis tank, and a temperature intelligent control system. The high-temperature wastewater tank contains pretreated food wastewater at a temperature of approximately 50-60℃. The cold water tank contains tap water. The cold water (at room temperature) is heated to 40-50℃ by heat exchange through the heat exchanger and heat pump unit. This warm water is then pumped into the bottom pipes of the hydrolysis tank by a circulating pump for heat preservation of the hydrolysis tank.

[0021] Furthermore, the system also includes:

[0022] Food wastewater treatment

[0023] Anaerobic biological system: using UASB process or hydrolysis acidification process to remove COD;

[0024] Aerobic biochemical system: includes a multi-stage AO system for the removal of total nitrogen and total phosphorus;

[0025] Advanced treatment system: includes sedimentation tank, aerated biological filter, and ozone disinfection tank, used to further remove total nitrogen so that the effluent meets discharge standards.

[0026] Domestic sewage treatment

[0027] Pretreatment system: includes coarse screen, fine screen and vortex grit chamber, used to treat solids;

[0028] Biochemical treatment system: This is a type of CASS biochemical reactor or AO biochemical reactor, used to effectively remove organic matter, ammonia nitrogen, total phosphorus, etc.

[0029] Advanced treatment system: sedimentation tank + D-type filter + ultraviolet disinfection tank, used to further remove suspended solids, COD and other pollutants, so that the effluent meets the discharge standards.

[0030] Beneficial effects:

[0031] (1) Based on the characteristics of suspended solids in food wastewater, the combination of different flocculants and coagulants can effectively separate suspended solids in wastewater, reduce the load on subsequent biochemical systems, and significantly improve the treatment effect of food wastewater process.

[0032] (2) At the same time, the suspended solids or organic matter in the food wastewater are decomposed and stabilized, and used as a carbon source for the domestic sewage treatment plant. The denitrification rate is comparable to that of glucose, thus realizing the effective utilization of resources.

[0033] (3) The waste heat in food wastewater is used for the insulation of protein hydrolysis tank by heat pump exchange device, which improves energy utilization efficiency and reduces operating costs and carbon emissions.

[0034] (4) Under the permission of the environmental protection department, the food wastewater is discharged by agreement discharge mode, the treatment capacity of the food sewage station and the domestic sewage plant is fully considered, and the treatment difficulty of the food wastewater is reduced;

[0035] (5) Through the system, the food-living wastewater treatment process is combined, the food-living wastewater is treated cooperatively, and regional pollution reduction and carbon reduction and resource recycling are realized. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 The application processing system logic diagram. DETAILED DESCRIPTION

[0037] The technical solutions will be described in detail below with reference to the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0038] Unless otherwise specified, the meanings of the technical terms in the specification are the same as those generally understood by those skilled in the art, but if there is a conflict, the definitions in the specification shall prevail.

[0039] The food wastewater described in the application mainly refers to protein food processing wastewater, such as dairy product wastewater, bean curd processing wastewater, etc.

[0040] As Figure 1 The logic diagram of the processing system of the application is shown in the figure, wherein A) is a pretreatment system, B) is an anaerobic biochemical system, C) is an aerobic biochemical system, D) is a deep treatment system for food wastewater treatment system, 01) is a pretreatment system, 02) is a biochemical treatment system, 03) is a deep treatment system and a suspended matter treatment system for municipal domestic wastewater treatment system, a) is a suspended matter hydrolysis tank, and b) is a stabilization tank. The solid matter obtained after the food wastewater is pretreated is used as a liquid carbon source for the treatment system for treating municipal domestic wastewater.

[0041] The following will be described in detail.

[0042] 1. Food wastewater treatment flow:

[0043] A. Food wastewater pretreatment system: including flocculation tank and air flotation tank, used for suspended matter precipitation and separation.

[0044] The system is used for flocculation treatment and air flotation treatment of food wastewater, and the supernatant after treatment is food sewage, which is used for subsequent wastewater treatment, and the suspended matter and precipitate are solid matter.

[0045] The flocculation tank is used for precipitating suspended matters in the wastewater, and the flocculation tank is used for strengthening flocculation and precipitation by using a coagulant and a flocculant.

[0046] The coagulant is one or more of poly-gamma-glutamic acid, chitosan, polyacrylamide, or lime milk.

[0047] The flocculant is one or more of polymeric ferric sulfate, polymeric ferric chloride, or polymeric ferric aluminum silicate.

[0048] According to the characteristics of different food industry wastewater, the coagulant can be used alone or in combination.

[0049] In the embodiment of the present application, chitosan, lime milk and polymeric ferric sulfate are used in combination, the concentration of the lime milk is 5%, the concentration of the chitosan is 0.1%-0.3%, the concentration of the polymeric ferric sulfate is 0.05%-0.2%, a small amount of lime milk is added to the wastewater to adjust the pH value of the wastewater to 7.5-8.5, and then the polymeric ferric sulfate or the polymeric aluminum chloride and the chitosan are added, which is more conducive to the flocculation and precipitation of the suspended matters.

[0050] The air flotation tank is used for separating small particles and protein suspended colloids in the wastewater, so that the load of the subsequent biochemical section is significantly reduced.

[0051] After the flocculation tank and the air flotation tank, the COD concentration in the wastewater is reduced by about 40%-55%, and the treatment load of the subsequent process is greatly reduced.

[0052] The food wastewater treated by the step is sent to an anaerobic biochemical system for further treatment, and the solid matters are sent to a suspended matter treatment system to make liquid carbon sources for domestic wastewater treatment.

[0053] B. Anaerobic biochemical system: UASB upflow anaerobic sludge bed or hydrolysis acidification tank, which is used for removing COD.

[0054] The system is used for anaerobic biochemical treatment to remove COD in the food wastewater. Since the biodegradability of the food processing wastewater is good, when the COD concentration in the pretreated wastewater is less than 1500 mg / L, the hydrolysis acidification process is preferably selected, and when the COD of the influent is 1500-2000 mg / L or more, the UASB process is selected.

[0055] In the embodiment of the present application, the anaerobic biological treatment adopts the hydrolysis acidification process, the hydraulic retention time is controlled to be 6-8 h, an alkali liquid dosing device is configured, and the COD removal rate can reach 50-60%.

[0056] In the embodiment of the present application, the anaerobic biological treatment adopts the UASB treatment process, the fermentation temperature is controlled to be 30-40℃, the sludge form is flocculent sludge and granular sludge coexisting, the COD load is set to be 6-8 kg COD / (m 3d) and configure the heat preservation device, gas separation device, alkalinity adjustment and control device, etc., and the COD removal efficiency reaches 60-80%.

[0057] The effluent of the anaerobic biochemical system enters the aerobic biochemical system.

[0058] C. Aerobic biochemical system: multi-stage AO process, used for total nitrogen and total phosphorus removal.

[0059] The system is used for aerobic biochemical treatment, and the aerobic biochemical system adopts multi-stage A / O process, A 2 O process, etc.

[0060] The multi-stage AO system is connected in series by pipelines, and the sewage enters each anoxic tank in a certain proportion, and each AO system is provided with a phosphorus removal agent adding device, and the phosphorus removal agent is added according to actual needs to strengthen the denitrification and phosphorus removal process.

[0061] The A 2 O is composed of anoxic, anaerobic and aerobic processes.

[0062] In the embodiment of the present application, four-stage A / O process is adopted, and the total nitrogen and total phosphorus removal efficiency reaches more than 85%;

[0063] In the embodiment of the present application, A 2 O process is adopted, and the total nitrogen removal efficiency reaches more than 70%, and the total phosphorus treatment efficiency reaches more than 80%.

[0064] D. Advanced treatment system: sedimentation tank + biological aerated filter + ozone disinfection tank, used for further removing total nitrogen and killing microorganisms in water.

[0065] The advanced treatment system comprises a sedimentation tank + biological aerated filter + ozone disinfection tank, etc., and the effluent reaches the protocol discharge standard and is discharged into the municipal sewage pipe network.

[0066] The protocol discharge standard is the water quality of the food factory and the municipal sewage treatment plant according to the characteristics of the water quality and the treatment capacity, the agreed drainage water quality, and the water quality of the food factory applying for the pollution discharge permit according to the agreement standard.

[0067] 2. Municipal sewage treatment process:

[0068] 01. Pretreatment system: including coarse grid, fine grid and cyclone sand settling tank, used for treating solid matters.

[0069] 02. Biochemical treatment system: one of CASS biochemical reaction tank or AO biochemical tank, used for effectively removing organic matters, ammonia nitrogen, total phosphorus, etc.

[0070] 03. Advanced treatment system: sedimentation tank + D-type filter tank + UV disinfection tank, used for further removal of suspended solids, COD, etc., so that the effluent meets the discharge standard.

[0071] 3. Suspended solids treatment system

[0072] a. Suspended solids hydrolysis tank: used for hydrolysis of macromolecular organic matter such as proteins in food wastewater.

[0073] b. Stable tank:

[0074] Suspended solids treatment system: including protein hydrolysis tank and hydrolysate stabilization tank: used for protein hydrolysis and stabilization of solid materials separated after pretreatment.

[0075] The suspended solids and sediments after pretreatment of food wastewater enter the suspended solids treatment system for resource recovery as carbon source.

[0076] The suspended solids treatment system includes a protein hydrolysis tank and a hydrolysate stabilization tank.

[0077] According to the nature of the food factory, the suspended solids of the food factory wastewater treatment plant pretreatment system can enter the hydrolysis tank alone or mixed with part of the wastewater for the preparation of carbon source required by the municipal domestic sewage treatment plant; the hydrolysis tank is a protein hydrolysis tank, which is used for hydrolyzing macromolecular proteins into small molecule acids, and is provided with a protease adding device, a temperature control device, a sludge discharge device, etc.; the optimal operating temperature of the protease is 40-50℃, the adding amount of the protease is 3-5 mg / g, the hydrolysis time is 4-5 h, and the hydrolysis pH is controlled at 7.0-8.5; the temperature control device includes a hydrolysis tank temperature sensor, a temperature intelligent control system, a heat exchange device, a constant temperature heating pipe, etc.; the temperature control device is used for using the waste heat in the food wastewater for heat preservation of the hydrolysis tank, and through the temperature feedback of the temperature sensor, the opening and closing of the water inlet valve of the hot water end of the heat exchange device is controlled, so that the temperature of the hydrolysis tank is maintained, the energy utilization efficiency is improved, and the operating cost is reduced; the protease hydrolysis process can realize the recovery of 30%-40% of the protein; the supernatant after hydrolysis enters the hydrolysate stabilization tank; the stabilization tank is provided with a stabilizer adding device, and the stabilizer is polyethylene glycol, EDTA, phenyl acetate, etc.; after hydrolysis, the addition of trace amount of stabilizer can inhibit the aggregation of polypeptides and amino acids, can adjust the biocompatibility, can improve the thermal stability, and can resist further degradation of protease; the stabilized hydrolysate is used as liquid carbon source for the municipal domestic sewage treatment plant.

[0078] In the embodiment of the present application, the denitrification rate of the protein hydrolysis carbon source is 3.3-5.5 mg NO 3- -N / (gVSS·h), which is comparable to the denitrification rate of glucose.

[0079] The application will be further described in conjunction with the drawings and specific embodiments so that those skilled in the art can better understand the application and implement it, but the embodiments are not limiting to the application.

[0080] Embodiment 1

[0081] The application provides a protein food wastewater and domestic sewage collaborative treatment system and method, which is used for collaborative treatment of milk processing plant wastewater and urban domestic sewage.

[0082] The milk processing plant production wastewater includes production pipeline flushing wastewater, in-plant domestic sewage, a small amount of dairy cattle breeding wastewater, etc.

[0083] As shown in the figure, the treatment system includes a food wastewater pretreatment system A connected with the milk processing plant wastewater pipeline, an anaerobic biochemical system B, an aerobic biochemical system C and a deep treatment system D. Figure 1

[0084] The pretreatment system includes a flocculation tank and an air flotation tank, the flocculation tank uses poly-g-glutamic acid and PAC for flocculation, the air flotation tank uses PAM for air flotation, and the milk processing wastewater is sequentially subjected to flocculation and air flotation, and then subjected to sedimentation separation to obtain supernatant and solid matter (the solid matter includes precipitate and suspended matter).

[0085] The anaerobic biochemical system adopts the UASB process to remove COD in the supernatant obtained from the pretreatment system, and the supernatant with removed COD is discharged into the aerobic biochemical system through a pipeline.

[0086] The aerobic biochemical system includes a multi-stage AO (anaerobic-oxygen) system for removal of total nitrogen and total phosphorus, and the supernatant after removal is subjected to the deep treatment system.

[0087] The deep treatment system includes a sedimentation tank, a biological aerated filter and an ozone disinfection tank, the treated water reaches the effluent discharge standard, and the food wastewater is treated completely.

[0088] On the other hand, the solid matter obtained through the pretreatment system A is subjected to a suspended matter treatment system, which includes a protein hydrolysis tank a and a hydrolysis liquid stabilization tank b.

[0089] The protein hydrolysis tank uses alkaline protease as a hydrolysis enzyme, the obtained hydrolysis liquid is subjected to the stabilization tank b, the stabilization tank uses polyethylene glycol and EDTA as stabilizers, and the obtained product is used as a carbon source for a downstream domestic sewage plant, and the measured denitrification rate of the effluent of the carbon source is 5.1-5.5 mg NO3 - -N / (g VSS·h).

[0090] ​The downstream domestic sewage plant comprises a pretreatment system 01, a biochemical treatment system 02 and a deep treatment system 03; wherein the pretreatment system comprises a coarse grid, a fine grid and a cyclone sand pool for treating suspended solids; then the sewage after removal of suspended solids enters the biochemical treatment system, the biochemical treatment system is a CASS biochemical reaction tank, the carbon source obtained by treating the milk processing plant sewage is added in the system for removing organic matter, ammonia nitrogen and total phosphorus, then the sewage enters the deep treatment system, including a sedimentation tank, a D-type filter tank and an ultraviolet disinfection tank, and after treatment, the effluent reaches the discharge standard, that is, the treatment is completed, and the effluent reaches the first level A discharge standard.

[0091] In the above treatment, a temperature control device is further arranged in the pretreatment system and the suspended solid treatment system of the milk wastewater, the temperature control device comprises a hydrolysis tank temperature sensor, a temperature intelligent control system, a heat exchange device and a constant temperature heating pipe; the waste heat in the food wastewater pretreatment system can be used for heat preservation of the hydrolysis tank.

[0092] After the implementation of the application, the effluent of the milk processing plant wastewater reaches the discharge standard stably, and the downstream city domestic sewage plant saves carbon source cost of about 120,000 yuan per year.

[0093] Example 2

[0094] The application provides a protein food wastewater and domestic sewage collaborative treatment system and method, which is used for collaborative treatment of tofu processing wastewater and city domestic sewage.

[0095] The treatment method is the same as that in example 1, except that the flocculation tank adopts lime milk and chitosan for enhanced flocculation, and PAC and PAM are added for air flotation, and the measured carbon source denitrification rate after hydrolysis treatment is 3.3-3.5 mg NO3 - -N / (gVSS·h).

[0096] Example 3

[0097] The whey protein processing plant wastewater is treated, and the treatment method is the same as that in example 1; the obtained carbon source denitrification rate is 5.3-5.5 mg NO3 - -N / (gVSS·h).

[0098] Comparative example 1

[0099] Different from example 1, the wastewater is not subjected to protease hydrolysis and is directly used for treatment in the city domestic sewage treatment plant; since the protein has a large molecular weight and is not easy to be utilized by microorganisms, the measured denitrification rate is only 1.2-1.5 mg NO3 - -N / (g VSS·h).

[0100] Comparative example 2

[0101] Compared with Example 2, the difference lies in that the neutral protease, the complex protease (the mass ratio of alkaline protease, neutral protease and acid protease is 1:1:1), and no protease are respectively used to hydrolyze the protein in the wastewater, the hydrolysis ability of the hydrolysis enzyme is determined by measuring the amino acid conversion rate (as shown in Table 1), and the alkaline protease has the best effect.

[0102] Table 1: Determination results of amino acid conversion rate of different protease treatment

[0103]

[0104] The preferred embodiments of the application are specifically described above, but the application is not limited to the described embodiments, and those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the application. These equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. A method for the co-treatment of food wastewater and domestic sewage, characterized in that, Includes the following steps: Food wastewater is pretreated to separate solids and supernatant; Solids are hydrolyzed and stabilized with proteases to obtain chemically stable hydrolysates. The stabilized hydrolysate was added to the pretreated domestic sewage as a liquid carbon source for domestic sewage treatment. The food wastewater pretreatment includes flocculation and flotation. The supernatant after treatment is food wastewater, which will be used for subsequent wastewater treatment. The suspended solids and precipitates are solids.

2. The processing method according to claim 1, characterized in that, The coagulant aid for the flocculation treatment is one or more of poly-γ-glutamic acid or chitosan, polyacrylamide, and lime milk; the flocculant is one or more of polyferric sulfate, polyferric chloride, and polyferric aluminum silicate; the stabilizer for the stabilization treatment is any one or a combination of polyethylene glycol, EDTA, and phenyl acetate, and the concentration of the stabilizer is 1-5 mmol / L.

3. The processing method according to claim 1, characterized in that, The protein is hydrolyzed at a temperature of 40-50℃, a time of 4-5 hours, and a pH of 7-8.

5.

4. The processing method according to claim 1, characterized in that, The protease used for protein hydrolysis is an alkaline protease, and the addition amount is 3-5 mg / g.

5. The processing method according to claim 1, characterized in that, The subsequent treatment process for the food wastewater obtained from the pretreatment separation is as follows: it undergoes anaerobic biochemical treatment, aerobic biochemical treatment, and advanced treatment to meet the discharge standards.

6. The processing method according to claim 1, characterized in that, The subsequent treatment process for the domestic sewage with added liquid carbon source is as follows: it undergoes biochemical treatment and advanced treatment to meet the discharge standards.

7. A system for the co-treatment of food wastewater and domestic sewage, characterized in that, To implement the wastewater treatment process according to any one of claims 1-6, comprising: Food wastewater pretreatment system: includes flocculation tank and flotation tank for sedimentation and separation of suspended solids; Suspended solids treatment system: includes a protein hydrolysis tank and a hydrolysate stabilization tank: used to hydrolyze and stabilize the pretreated and separated solids.

8. The processing system according to claim 7, characterized in that, The food wastewater pretreatment system and suspended solids treatment system are also equipped with a wastewater waste heat recovery and utilization device, including a high-temperature sewage tank, a cold water tank, a heat exchanger, a heat pump unit, a branched heating pipe at the bottom of the hydrolysis tank, a hydrolysis tank temperature sensor, and a temperature intelligent control system.

9. The processing system according to claim 7, characterized in that, The high-temperature wastewater tank contains pretreated food wastewater at a temperature of approximately 50-60°C. The cold water tank contains tap water (at room temperature). The cold water is heated to 40-50°C by a heat exchanger and a heat pump. The warm water is then pumped into the bottom pipe of the hydrolysis tank by a circulating pump for insulation of the hydrolysis tank.

10. The processing system according to claim 7, characterized in that, The system also includes: Food wastewater treatment Anaerobic biological system: using UASB process or hydrolysis acidification process to remove COD; Aerobic biochemical system: includes a multi-stage AO (anaerobic-aerobic) system for the removal of total nitrogen and total phosphorus; Advanced treatment system: includes sedimentation tank, aerated biological filter, and ozone disinfection tank, used to further remove total nitrogen so that the effluent meets discharge standards. Domestic sewage treatment Pretreatment system: includes coarse screen, fine screen and vortex grit chamber, used to treat suspended solids; Biochemical treatment system: This is a type of CASS biochemical reactor or AO biochemical reactor, used to effectively remove organic matter, ammonia nitrogen, total phosphorus, etc. Advanced treatment system: sedimentation tank + D-type filter + ultraviolet disinfection tank, used to further remove suspended solids, COD and other pollutants, so that the effluent meets the discharge standards.

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