CN112142256B - Comprehensive full-quantification treatment system for kitchen wastewater and application method of comprehensive full-quantification treatment system - Google Patents
Comprehensive full-quantification treatment system for kitchen wastewater and application method of comprehensive full-quantification treatment system Download PDFInfo
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- 239000002351 wastewater Substances 0.000 title claims abstract description 111
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000011002 quantification Methods 0.000 title claims abstract description 19
- 239000012528 membrane Substances 0.000 claims abstract description 33
- 238000001728 nano-filtration Methods 0.000 claims abstract description 29
- 239000007788 liquid Substances 0.000 claims abstract description 27
- 238000012546 transfer Methods 0.000 claims abstract description 27
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 26
- 238000001704 evaporation Methods 0.000 claims abstract description 21
- 230000008020 evaporation Effects 0.000 claims abstract description 21
- 239000012141 concentrate Substances 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 65
- 239000003344 environmental pollutant Substances 0.000 claims description 27
- 231100000719 pollutant Toxicity 0.000 claims description 27
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 18
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 18
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 14
- 239000003546 flue gas Substances 0.000 claims description 14
- 150000003839 salts Chemical class 0.000 claims description 13
- 238000000926 separation method Methods 0.000 claims description 13
- 238000004065 wastewater treatment Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 5
- 238000009280 upflow anaerobic sludge blanket technology Methods 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 3
- 238000010977 unit operation Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 20
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 239000010806 kitchen waste Substances 0.000 description 6
- 238000012545 processing Methods 0.000 description 5
- 239000000498 cooling water Substances 0.000 description 4
- 239000008235 industrial water Substances 0.000 description 4
- 239000010865 sewage Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000002071 nanotube Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000010992 reflux Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
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- 238000004519 manufacturing process Methods 0.000 description 2
- 239000010813 municipal solid waste Substances 0.000 description 2
- 210000003462 vein Anatomy 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 241000255925 Diptera Species 0.000 description 1
- 241001148470 aerobic bacillus Species 0.000 description 1
- 230000003851 biochemical process Effects 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
- 230000001488 breeding effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 238000007791 dehumidification Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 239000000203 mixture Substances 0.000 description 1
- 230000001546 nitrifying effect Effects 0.000 description 1
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- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000013139 quantization Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a comprehensive full-quantification treatment system for kitchen wastewater, which comprises a gas-liquid mass transfer concentrated solution treatment evaporation system, a heat exchanger, a three-phase separator, an anaerobic treatment system, an A/O biochemical treatment system, an MBR treatment system, a nanofiltration treatment system and a reverse osmosis treatment system. The application method of the kitchen wastewater comprehensive full-quantification treatment system. According to the treatment system, biogas generated by an anaerobic treatment technology is utilized to effectively treat the membrane concentrate by a gas-liquid mass transfer concentration treatment evaporation technology, so that the comprehensive full-quantification economic treatment requirement of the kitchen wastewater is met.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to a kitchen wastewater comprehensive full-quantification treatment system and a use method thereof.
Background
The kitchen waste water is high-oil-content organic waste water generated in the kitchen waste collection and transportation process, has the characteristics of easy corrosion and odor generation, mosquito and fly breeding and the like, and can seriously pollute the surrounding environment if being improperly treated.
The kitchen waste water discharge requirements of China are more and more strict, if the kitchen waste treatment industry enters a vein industrial garden and the kitchen waste and the garbage are incinerated together, the kitchen waste water discharge standard is required to be executed according to the waste water discharge standard of the garbage incineration industry, and the industrial reuse water treatment requirements are required to be met.
At present, the main kitchen wastewater treatment process in China comprises the following steps: deoiling+anaerobic+biochemical treatment (MBR) + nanofiltration. The treatment process is stable, and the system effluent reaches the discharge requirement of the nano tube.
However, the prior treatment process has main defects: the nanofiltration membrane concentrated solution is difficult to effectively treat; the effluent can not meet the requirements of industrial reuse water; the oil removing unit needs to additionally increase energy consumption to preheat the water cost of the kitchen; meanwhile, the biogas generated by the anaerobic system is burnt out by a biogas torch, so that resource waste is caused.
Disclosure of Invention
Aiming at the defects of the prior art, the invention solves the technical problem of providing a kitchen wastewater comprehensive full-quantification treatment system and method. The method utilizes a gas-liquid mass transfer concentrated solution treatment evaporation technology, a heat exchanger, a three-phase separator, an anaerobic treatment technology, an A/O biochemical treatment technology, an MBR treatment technology, a nanofiltration treatment technology and a reverse osmosis treatment technology to treat the kitchen wastewater to reach industrial reuse water standards, and simultaneously utilizes methane generated by an anaerobic system to effectively treat nanofiltration membranes and membrane concentrate generated by reverse osmosis membranes to achieve the technical aim of full quantization and resource treatment of the kitchen wastewater.
In order to solve the problems, the invention adopts the following scheme: the comprehensive full-quantification treatment system for the kitchen wastewater is characterized by comprising a gas-liquid mass transfer concentrated solution treatment evaporation system, a heat exchanger, a three-phase separator, an anaerobic treatment system, an A/O biochemical treatment system, an MBR treatment system, a nanofiltration treatment system and a reverse osmosis treatment system;
The gas-liquid mass transfer concentrated solution treatment evaporation system comprises methane combustion equipment, a gas-liquid mass transfer device, a flue gas condensing device, a condensed water collecting system and a concentration treatment device for salt and pollutants after concentration treatment of concentrated solution;
The heat exchanger utilizes high-temperature flue gas generated by a gas-liquid mass transfer concentration evaporation technology to preheat kitchen wastewater through the heat exchanger;
The three-phase separator is used for recycling oil in the preheated wastewater;
The anaerobic treatment system is used for carrying out anaerobic treatment on the deoiled wastewater, the generated biogas enters the gas-liquid mass transfer concentration treatment system for utilization, and the produced water enters the A/O biochemical treatment technology;
The A/O biochemical treatment system is used for removing COD and ammonia nitrogen in the wastewater;
the MBR treatment system is used for realizing mud-water separation in the wastewater treatment process and simultaneously removing a part of large-particle pollutants;
The nanofiltration treatment system and the reverse osmosis treatment system are used for intercepting pollutants and salt in the effluent of the MBR treatment system, so that the produced water reaches the industrial reuse water standard.
Furthermore, the application method of the kitchen wastewater comprehensive and full-quantitative treatment system is characterized by comprising the following steps of:
s1: the kitchen wastewater enters a heat exchanger for heating treatment, so that oil and water in the wastewater overflows;
S2: the preheated kitchen wastewater obtained in the step S1 enters a three-phase separator to realize the separation of oil, wastewater and suspended matters in the wastewater;
s3: delivering the wastewater and suspended matters subjected to oil removal in the step S2 into an anaerobic treatment system, and removing most pollutants in the wastewater;
S4: the produced water in the step S3 enters a subsequent A/O treatment system to further remove COD and ammonia nitrogen in the wastewater;
S5: enabling the effluent of the system in the step S4 to enter an MBR treatment system, realizing mud-water separation in the wastewater treatment process, and simultaneously removing a part of large-particle pollutants;
s6: and (3) passing the produced water in the step S5 through a nanofiltration treatment system and a reverse osmosis treatment system, and intercepting pollutants and salt in the effluent of the MBR treatment system to ensure that the produced water reaches the industrial reuse water standard.
Furthermore, according to the application method of the kitchen wastewater comprehensive full-quantification treatment system provided by the design scheme, the kitchen wastewater comprehensive full-quantification treatment system is characterized in that membrane concentrate generated by the nanofiltration treatment system and the reverse osmosis treatment system is sent into a gas-liquid mass transfer concentrate treatment evaporation system, effective treatment of the membrane concentrate is achieved, after evaporation, separated salt and pollutants are transported outwards, high-temperature flue gas generated by the system carries out heating treatment on the kitchen wastewater through a heat exchanger, and condensed water enters an MBR system for treatment.
Furthermore, according to the application method of the kitchen wastewater comprehensive and full-quantification treatment system, which is characterized in that the heat exchanger adopts a plate frame or a U-shaped tubular heat exchanger, and two sides of the heat exchanger are respectively arranged in high-temperature flue gas and kitchen wastewater; in the step S1, the heat exchanger preheats the temperature in the kitchen wastewater to be more than or equal to 60 ℃, so that oil in the kitchen wastewater overflows from the wastewater, and the subsequent oil removing unit operation is facilitated.
Furthermore, according to the application method of the kitchen wastewater comprehensive and full-quantitative treatment system, the use method is characterized in that the anaerobic treatment system is one of a UASB anaerobic system, a CSTR anaerobic system and an IC anaerobic system.
Furthermore, according to the application method of the kitchen wastewater comprehensive full-quantification treatment system, which is characterized in that the reflux ratio of the aerobic tank in the A/O biochemical treatment system to the anaerobic tank is determined according to the ammonia nitrogen content in the wastewater, and the reflux ratio is 30-400.
Furthermore, according to the above design, the method for using the integrated and full-quantitative kitchen wastewater treatment system is characterized in that the MBR treatment system is one of an immersed MBR system, an external MBR system and a flat membrane type MBR system.
The effluent in the step S7 reaches the standard of open type circulating cooling water in the table of urban sewage recycling-industrial water quality (GB/T19923-2005), wherein COD is less than or equal to 30mg/L, ammonia nitrogen is less than or equal to 1mg/L, pH: 6.5-9.0, hardness: < 450mg/L.
The industrial reuse water refers to reverse osmosis water production of kitchen wastewater, and the reverse osmosis water outlet index range is as follows: COD: < 30mg/L, TDS: less than 1000mg/L, ammonia nitrogen: <1 mg/L, pH: 6.5-9.0, hardness: < 450mg/L.
The invention has the following technical effects: the gas-liquid mass transfer concentration treatment system uses methane generated by the anaerobic system as a heat source to carry out evaporation treatment on nanofiltration membrane concentrated solution and reverse osmosis membrane concentrated solution, and simultaneously generates high-temperature flue gas which is used for carrying out preheating treatment on kitchen wastewater through a heat exchanger; concentrating the separated salt and carrying out outward treatment on pollutants; and the condensed water generated by condensation enters an MBR treatment system for further treatment.
Drawings
Fig. 1 is a process flow diagram.
FIG. 2 is a flow chart of the A/O biochemical process.
FIG. 3 is a flow chart of nanofiltration membrane and reverse osmosis membrane treatment processes.
Fig. 4 is a flow chart of a gas-liquid mass transfer concentrate treatment evaporation process.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
A kitchen wastewater comprehensive full-quantification treatment system and method are based on a gas-liquid mass transfer concentrated solution treatment evaporation technology, a heat exchanger, a three-phase separator, an anaerobic treatment technology, an A/O biochemical treatment technology, an MBR treatment technology, a nanofiltration treatment technology and a reverse osmosis treatment technology which are connected in sequence; the method is realized by adopting the following technical route:
s1: the kitchen wastewater enters a heat exchanger for heating treatment, so that oil and water in the wastewater overflows;
S2: the preheated kitchen wastewater obtained in the step S1 enters a three-phase separator to realize the separation of oil, wastewater and suspended matters in the wastewater;
s3: delivering the wastewater and suspended matters subjected to oil removal in the step S2 into an anaerobic treatment system, and removing most pollutants in the wastewater;
S4: the produced water in the step S3 enters a subsequent A/O treatment system to further remove COD and ammonia nitrogen in the wastewater;
S5: enabling the effluent of the system in the step S4 to enter an MBR treatment system, realizing mud-water separation in the wastewater treatment process, and simultaneously removing a part of large-particle pollutants;
s6: the water produced in the step S5 is treated by a nanofiltration treatment system and a reverse osmosis treatment system, so that pollutants and salt in the kitchen wastewater are intercepted, and the produced water reaches the industrial reuse water standard;
S7: and (3) sending the membrane concentrate in the step (S6) into a gas-liquid mass transfer concentration treatment system to realize effective treatment of the membrane concentrate, carrying out outward treatment on separated salt and pollutants after evaporation, heating kitchen wastewater by high-temperature flue gas generated by the system through a heat exchanger, and allowing condensed water to enter an MBR system for treatment.
The industrial reuse water refers to reverse osmosis water production of kitchen wastewater, and the reverse osmosis water outlet index range is as follows: COD is less than or equal to 30mg/L, ammonia nitrogen is less than or equal to 1mg/L, pH: 6.5-9.0, hardness: < 450mg/L.
In the step S1, the heat exchanger adopts a plate frame or a U-shaped tube heat exchanger, and the biological purpose of the kitchen wastewater is realized by utilizing the temperature difference of two media passing through the heat exchanger; at the side of the kitchen wastewater channel, the preheating of the temperature in the kitchen wastewater is more than or equal to 60 ℃, so that the subsequent oil removal unit operation is convenient; on the other side, high-temperature steam generated by the gas-liquid mass transfer concentration treatment system is condensed by a heat exchanger, so that the water vapor in the high-temperature flue gas is converted into condensed water;
In step S2, the specific processing steps of the three-phase separator processing system are as follows: the preheated kitchen wastewater is sent to a three-phase separator treatment unit, oil phase is separated from the wastewater in a centrifugal way by utilizing the difference of specific gravity among oil content, wastewater and a small amount of suspended matters in the kitchen wastewater, and the recycling of the oil content is realized; the rest waste water and a small amount of suspended matters enter the next anaerobic treatment system;
In step S3, the anaerobic treatment technology specifically includes the following steps: the kitchen wastewater subjected to oil removal treatment enters an anaerobic reaction system, wherein the anaerobic system can be one of UASB anaerobic technology, CSTR anaerobic technology and IC anaerobic technology; the anaerobic flora in the anaerobic system is utilized to realize degradation and conversion of pollutants in the wastewater, most organic pollutants are converted into methane and carbon dioxide, and part of methane enters a gas-liquid mass transfer concentration treatment system after desulfurization and dehumidification treatment; after most pollutants are removed by the anaerobic system, the wastewater enters a subsequent biochemical treatment system;
In step S4, the specific processing steps of the A/O biochemical processing system are as follows: anaerobic effluent enters an anoxic tank of the A/O biochemical treatment system, and nitrate nitrogen in the A/O biochemical treatment system is degraded by utilizing organic matters in the anaerobic effluent; the effluent of the anoxic tank enters an aerobic tank, and degradation of biochemical organic matters and conversion of ammonia nitrogen in the wastewater are realized by utilizing aerobic bacteria and nitrifying bacteria; the wastewater in the aerobic tank is refluxed to the anoxic tank in a large proportion, nitrate nitrogen generated in the wastewater is removed, and the reflux ratio is controlled to be 30-400;
In step S5, the MBR processing system specifically includes the following steps: the mud-water mixture of the A/O biochemical treatment system enters an MBR treatment system, and the MBR system can select an immersed MBR, an external MBR and a flat membrane type MBR; utilizing the microporous structure of the MBR membrane to realize sludge-water separation of wastewater, and intercepting part of macromolecules and insoluble pollutants;
In step S6, the specific treatment steps of the nanofiltration membrane system and the reverse osmosis system are as follows: the water produced by the MBR treatment system sequentially enters a nanofiltration membrane and a reverse osmosis membrane system, the separation of pollutants in the wastewater and the wastewater is realized by utilizing the nanoscale apertures on the nanofiltration membrane and the reverse osmosis membrane, so that the wastewater meets the standard of open-type circulating cooling water in the surface of the requirement of industrial reuse water for urban wastewater recycling-industrial water quality (GB/T19923-2005), and the concentrated solution produced by the membrane process enters the next step;
In the step S7, the specific treatment steps of the gas-liquid mass transfer concentration treatment system are as follows: step S3, methane generated in the anaerobic treatment system enters a gas-liquid mass transfer concentration treatment system for combustion to form high-temperature flue gas; the membrane concentrate from the step S6 is directly subjected to heat exchange treatment by high-temperature flue gas in a gas-liquid mass transfer concentration treatment system, and carries moisture in wastewater to evaporate, so that further concentration of pollutants reaches the requirements of salt content and pollutant precipitation, the generated high-temperature steam is condensed by a heat exchanger, and the generated condensed water is sent into the S5 system to be treated.
COD: 60000mg/L, TDS: < 10000mg/L, TN: 2200mg/L, NH3-N: < 600mg/L, pH: 6-9.
Example 1:
The method is used for treating kitchen wastewater of a certain project, COD=55000-60000 mg/L, TDS is less than 1000mg/L, NH3-N is less than 500mg/L, and oil content is less than 17%. After the strand of wastewater is preheated and subjected to three-phase separation, the content of oil in the wastewater is less than or equal to 50mg/L; the wastewater after degreasing enters a UASB anaerobic system to reduce COD in the wastewater to 5000-7000mg/L; the anaerobic effluent enters an A/O biochemical treatment unit to further remove COD and ammonia nitrogen in the wastewater, so that the COD in the wastewater is reduced to less than or equal to 1000mg/L, the ammonia nitrogen is less than or equal to 10mg/L, and the total nitrogen is less than or equal to 30mg/L; the A/O effluent enters a nanofiltration membrane system and a reverse osmosis system, and the reverse osmosis produced water is subjected to open type circulating cooling water standard requirements in the table of urban sewage recycling-industrial water quality (GB/T19923-2005); the nanofiltration and reverse osmosis concentrated solution enters a gas-liquid mass transfer concentrated solution treatment evaporation system to further concentrate the membrane concentrated solution so as to separate out salt and pollutants in the concentrated solution, and the concentrated solution is treated by a dehydrator and then is transported to the outside for treatment; condensing the evaporated water to generate condensed water, wherein COD in the condensed water is less than or equal to 300mg/L, ammonia nitrogen is less than or equal to 5mg/L, and entering an MBR system for further treatment.
Example 2:
The method is used for treating the kitchen wastewater in a certain vein industrial garden, COD=50000-65000 mg/L, TDS is less than 11000mg/L, NH 3-N=450-600 mg/L, and oil content is approximately equal to 15%. After the strand of wastewater exchanges heat through the plate-and-frame heat exchanger, the temperature of the wastewater is increased to 75 ℃; after the temperature is raised, the wastewater enters a three-phase separator to remove the oil content in the wastewater to be less than or equal to 35mg/L, and enters a CSTR anaerobic reactor to reduce the COD in the wastewater to 1200mg/L; anaerobic effluent enters an A/O biochemical treatment unit, COD in the wastewater is reduced to below 850mg/L, ammonia nitrogen is reduced to below 10mg/L, and total nitrogen is reduced to 15mg/L; the sludge-water separation is realized through an MBR treatment system, and then the sludge-water separation enters a nanofiltration treatment system and a reverse osmosis treatment system, and the produced water meets the standard requirement of open-type circulating cooling water in the table of urban sewage recycling-industrial water quality (GB/T19923-2005); the membrane concentrate enters a gas-liquid mass transfer concentrate treatment evaporation system, and methane generated in the CSTR anaerobic process is used as a heat source to carry out evaporation crystallization treatment on the membrane concentrate, so that full-scale treatment and regeneration and reuse of kitchen wastewater are realized.
Example 3:
The method is used for treating the wastewater of a certain kitchen treatment enterprise, wherein COD=55000-75000 mg/L, TDS is less than 13000mg/L, TN=2000-2200 mg/L; NH 3-N=450-600 mg/L, and oil content is less than 16%. After the high-temperature flue gas passes through the U-shaped tubular heat exchanger for heat exchange, the water temperature in the kitchen wastewater is more than or equal to 70 ℃; separating by a three-phase separator to remove oil in the kitchen wastewater; after oil removal, the kitchen wastewater enters an IC anaerobic system, organic matters are effectively removed, COD=10000-12000 mg/L in anaerobic effluent, and ammonia nitrogen is 1300-1500 mg/L; anaerobic effluent enters A subsequent A/OO-A/O treatment system to further remove biodegradable pollutants in the wastewater; the sludge-water separation is realized through an external MBR system, COD in the effluent is less than or equal to 1000mg/L, and ammonia nitrogen is less than or equal to 20mg/L; the effluent of the MBR enters a nanofiltration system, the COD of the effluent of the nanofiltration system is less than 300mg/L, the ammonia nitrogen is less than 25mg/L, and the discharge requirement of the nano tube is met. The nanofiltration membrane concentrated solution enters a gas-liquid mass transfer concentrated solution treatment evaporation system, the nanofiltration membrane concentrated solution is treated by taking methane generated by anaerobic treatment as a heat source, the full quantification treatment of the nanofiltration membrane concentrated solution is realized, condensed water generated by condensation has COD less than 400mg/L, ammonia nitrogen less than 25mg/L, total nitrogen less than 40mg/L, and the condensed water is mixed with nanofiltration produced water and discharged into a city nano tube system.
Claims (4)
1. The application method of the kitchen wastewater comprehensive full-quantification treatment system is characterized by comprising a gas-liquid mass transfer concentrated solution treatment evaporation system, a heat exchanger, a three-phase separator, an anaerobic treatment system, an A/O biochemical treatment system, an MBR treatment system, a nanofiltration treatment system and a reverse osmosis treatment system;
The gas-liquid mass transfer concentrated solution treatment evaporation system comprises methane combustion equipment, a gas-liquid mass transfer device, a flue gas condensing device, a condensed water collecting system and a concentration treatment device for salt and pollutants after concentration treatment of concentrated solution;
The heat exchanger is used for carrying out preheating treatment on the kitchen wastewater by utilizing high-temperature flue gas generated by the gas-liquid mass transfer concentration evaporation system;
The three-phase separator is used for recycling oil in the preheated wastewater;
the anaerobic treatment system is used for carrying out anaerobic treatment on the deoiled wastewater, the generated biogas enters the gas-liquid mass transfer concentration treatment system for utilization, and the produced water enters the A/O biochemical treatment system;
The A/O biochemical treatment system is used for removing COD and ammonia nitrogen in the wastewater;
the MBR treatment system is used for realizing mud-water separation in the wastewater treatment process and simultaneously removing a part of large-particle pollutants;
The nanofiltration treatment system and the reverse osmosis treatment system are used for intercepting pollutants and salt in the effluent of the MBR treatment system, so that the produced water reaches the industrial reuse water standard;
The application method of the kitchen wastewater comprehensive full-quantification treatment system for treating the kitchen wastewater comprises the following steps:
s1: the kitchen wastewater enters a heat exchanger for heating treatment, so that oil and water in the wastewater overflows;
S2: the preheated kitchen wastewater obtained in the step S1 enters a three-phase separator to realize the separation of oil, wastewater and suspended matters in the wastewater;
s3: delivering the wastewater and suspended matters subjected to oil removal in the step S2 into an anaerobic treatment system, and removing most pollutants in the wastewater;
S4: the produced water in the step S3 enters a subsequent A/O treatment system to further remove COD and ammonia nitrogen in the wastewater;
S5: enabling the effluent of the system in the step S4 to enter an MBR treatment system, realizing mud-water separation in the wastewater treatment process, and simultaneously removing a part of large-particle pollutants;
S6: the produced water in the step S5 passes through a nanofiltration treatment system and a reverse osmosis treatment system, and pollutants and salt in the effluent of the MBR treatment system are intercepted, so that the produced water reaches the industrial reuse water standard; the membrane concentrate produced by the nanofiltration treatment system and the reverse osmosis treatment system is sent into the gas-liquid mass transfer concentrate treatment evaporation system, so that the effective treatment of the membrane concentrate is realized, after evaporation, the separated salt and pollutants are transported outwards, the high-temperature flue gas produced by the system carries out heating treatment on kitchen wastewater through a heat exchanger, and the condensed water enters the MBR system for treatment.
2. The method for using the comprehensive and full-quantification treatment system for kitchen wastewater according to claim 1, wherein the heat exchanger is a plate frame or a U-shaped tubular heat exchanger, and two sides of the heat exchanger are respectively arranged in high-temperature flue gas and kitchen wastewater; in the step S1, the heat exchanger preheats the temperature in the kitchen wastewater to be more than or equal to 60 ℃, so that oil in the kitchen wastewater overflows from the wastewater, and the subsequent oil removing unit operation is facilitated.
3. The method for using a kitchen wastewater comprehensive and full-scale treatment system according to claim 1, wherein the anaerobic treatment system is one of a UASB anaerobic system, a CSTR anaerobic system and an IC anaerobic system.
4. The method of claim 1, wherein the MBR treatment system is one of an immersed MBR system, an external MBR system and a flat membrane MBR system.
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| CN110668633A (en) * | 2019-07-31 | 2020-01-10 | 南京万德斯环保科技股份有限公司 | Kitchen waste sorting wastewater treatment system and process |
| CN110848696A (en) * | 2019-12-02 | 2020-02-28 | 上海环境工程设计研究院有限公司 | Small kitchen waste oil extraction heating system and process |
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| CN107628729A (en) * | 2017-10-27 | 2018-01-26 | 银川保绿特生物技术有限公司 | A kind of food waste percolate recycling treatment system and method |
| CN110668633A (en) * | 2019-07-31 | 2020-01-10 | 南京万德斯环保科技股份有限公司 | Kitchen waste sorting wastewater treatment system and process |
| CN110848696A (en) * | 2019-12-02 | 2020-02-28 | 上海环境工程设计研究院有限公司 | Small kitchen waste oil extraction heating system and process |
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