CN220317556U - Zero release integrated treatment system for wastewater of household garbage incineration power plant - Google Patents
Zero release integrated treatment system for wastewater of household garbage incineration power plant Download PDFInfo
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Abstract
The utility model discloses a zero-emission comprehensive treatment system for wastewater of a household garbage incineration power plant, which comprises the following components: the device comprises a percolate treatment unit, a domestic sewage treatment unit, a low-concentration inorganic sewage treatment unit, a medicament adding unit and a circulating cooling tower unit; the chemical adding unit is used for adding chemical; the leachate treatment unit is used for treating garbage leachate and discharge hall flushing water; the domestic sewage treatment unit is used for treating factory domestic sewage, waste transportation approach bridge flushing drainage, wagon balance area flushing drainage and initial rainwater drainage; the low-concentration inorganic sewage treatment unit is used for treating the sewage discharged by the circulating cooling tower, reverse osmosis concentrated water in the process of preparing desalted water and boiler workshop water; clear liquid generated by each treatment unit is recycled to the circulating cooling tower unit, and concentrated liquid generated by each unit is treated in a grading manner in a factory. The utility model carries out sewage diversion on the wastewater, has the advantages of good treatment effect, low operation cost, small concentrate production amount and the like, and realizes the zero emission of wastewater in the whole factory.
Description
Technical Field
The utility model belongs to the technical field of sewage treatment, and particularly relates to a zero-emission comprehensive treatment system for wastewater of a household garbage incineration power plant.
Background
The wastewater generated in the production and operation processes of the household garbage incineration power plant mainly comprises garbage percolate, domestic sewage, workshop production wastewater and the like, and the closed circulation cooling tower is adopted to generate cooling tower sewage wastewater, so that the water quality indexes of each type of wastewater are obviously different, and the treatment process and the treatment unit price are different. The landfill leachate has high concentration of organic pollutants and ammonia nitrogen, better biodegradability, contains various heavy metal pollutants, has COD of tens of thousands of mg/L, has complex treatment process and high treatment unit price; the concentration of organic pollutants and ammonia nitrogen in domestic sewage is relatively low, the biodegradability is good, the heavy metal and salt pollutants are low, the treatment process is simple, and the treatment unit price is low; organic pollutants and ammonia nitrogen concentration of workshop production wastewater and cooling tower blowdown wastewater are low, biochemical treatment cannot be performed, salt pollutants are removed by a physicochemical method, a treatment process is relatively simple, and treatment unit price is relatively low.
At present, the following modes are generally adopted for wastewater treatment of a household garbage incineration power plant:
1. and after all the waste water is mixed, a leachate treatment process is uniformly adopted, the treated waste water reaches the local nano-tube standard and is discharged into a local municipal sewage pipe network, and finally the treated waste water reaches the standard and is discharged after being treated by a municipal sewage treatment plant.
2. All the waste water is mixed and then uniformly treated by a percolate treatment process, the treated produced water reaches the standard of industrial water quality for urban sewage recycling (GB/T19923-2005) and is recycled to a cooling tower to be used as production water, and the produced concentrated solution is transported to be treated.
3. The landfill leachate is treated in a factory, the produced water after the treatment of the leachate is recycled in the factory, and the concentrated solution is transported outside or treated in the factory in a digestion way; domestic sewage and cooling tower blowdown waste water are discharged into local municipal sewage pipe network, finally discharged after the treatment of municipal sewage treatment plant reaches the standard.
The wastewater treatment mode of the household garbage incineration power plant is not real zero emission of whole plant wastewater, the emphasis is placed on landfill leachate treatment, the wastewater in the plant area is not distinguished in detail according to physical and chemical properties, and the method has an optimization space in the aspects of sewage diversion, wastewater treatment cost, concentrated solution production, graded absorption modes and the like. Therefore, it is necessary to provide a zero-emission comprehensive treatment system for wastewater of a household garbage incineration power plant, so as to ensure that all the wastewater of the whole plant can be properly treated in the plant, and realize the classified harmless treatment and recycling, the multipurpose and the classified digestion of the wastewater.
Disclosure of Invention
The utility model aims to solve the technical problem of realizing zero emission of wastewater from the whole plant of the household garbage incineration power plant, and has the difficulty of index control of circulating cooling water and proper treatment of concentrated solution generated by wastewater membrane treatment. By analyzing the physicochemical properties of various waste water, the sewage is split, reasonable treatment processes are respectively adopted, the overall operation cost of the waste water is reduced, and byproduct pollutants generated in the treatment process are properly classified and treated. On one hand, the production amount of the concentrated solution in the factory is reduced, and the absorption and disposal pressure of the concentrated solution is reduced; on the other hand, the concentration ratio of the circulating water is controlled, the industrial circulating water is reasonably consumed, the zero discharge of wastewater of the whole factory is finally realized, and the safe and stable operation of the unit is ensured.
In order to solve the technical problems, the utility model adopts the following technical scheme:
a zero discharge integrated treatment system for wastewater of a household garbage incineration power plant comprises: the device comprises a percolate treatment unit, a domestic sewage treatment unit, a low-concentration inorganic sewage treatment unit, a medicament adding unit and a circulating cooling tower unit; the chemical adding unit is used for adding various chemical chemicals in the wastewater treatment process; the circulating cooling tower unit is an industrial water cooling device of the household garbage incineration power plant;
the leachate treatment unit is used for treating landfill leachate and unloading hall flushing water and comprises a deslagging grille machine, a leachate regulating tank, a UASB anaerobic reactor, a two-stage nitrification and denitrification tank, an external ultrafiltration unit, a nanofiltration unit, a high-concentration reverse osmosis unit and a clear liquid tank which are sequentially connected, wherein the output end of the clear liquid tank is connected with the input end of a circulating cooling tower unit, and the output end of the circulating cooling tower unit is connected with the input end of a low-concentration inorganic sewage treatment unit;
the domestic sewage treatment unit is used for treating factory domestic sewage, waste transportation approach bridge flushing drainage, wagon balance area flushing drainage and initial rainwater drainage, and comprises a deslagging grille machine, a hair collector, a domestic sewage regulating tank, a coagulating sedimentation tank, a primary nitrification and denitrification tank and a built-in ultrafiltration unit which are connected in sequence, wherein the output end of the built-in ultrafiltration unit is connected with the input end of a clear liquid tank;
the low-concentration inorganic sewage treatment unit is used for treating reverse osmosis concentrated water and boiler plant drainage in the preparation process of circulating cooling tower sewage and desalted water; comprises a low-concentration inorganic sewage regulating tank, a coagulation air floatation tank, a sand filter, an intermediate water tank, an ultrafiltration unit and a low-concentration reverse osmosis unit which are connected in sequence; the output end of the low-concentration reverse osmosis unit is connected with the input end of the clear liquid pool.
As a further improvement of the utility model, the device also comprises a concentrated solution decrement unit, wherein the concentrated solution decrement unit comprises an NF-DTRO decrement unit and an RO-DTRO decrement unit, the input end of the NF-DTRO decrement unit is connected with the nanofiltration unit, and the NF-DTRO decrement unit is used for treating nanofiltration concentrated solution generated by the percolate treatment unit; the input end of the RO-DTRO decrement unit is respectively connected with the high-concentration reverse osmosis unit and the low-concentration reverse osmosis unit, and the RO-DTRO decrement unit is used for treating the high-concentration reverse osmosis concentrated solution generated by the percolate treatment unit and the low-concentration reverse osmosis concentrated solution generated by the low-concentration inorganic sewage treatment unit; the yield of the produced water of the NF-DTRO decrement unit and the RO-DTRO decrement unit is 50%, and the produced water enters the clear liquid pool.
As a further improvement of the utility model, the utility model also comprises a sludge treatment unit, wherein the sludge treatment unit is used for treating various types of sludge generated by the wastewater process; the UASB anaerobic reactor, the two-stage nitrification and denitrification tank, the coagulating sedimentation tank, the first-stage nitrification and denitrification tank and the coagulating air floatation tank are all connected with the sludge treatment unit, and the produced sludge is conveyed to the sludge treatment unit for treatment; and the clear liquid generated by the sludge treatment unit is conveyed to a two-stage nitrification and denitrification tank for secondary utilization.
As a further improvement of the utility model, the sewage treatment device also comprises an odor treatment unit, wherein the odor treatment unit is used for collecting various types of odor generated in the wastewater treatment process, and the percolate regulating tank, the two-stage nitrification and denitrification tank, the domestic sewage regulating tank, the low-concentration inorganic sewage regulating tank and the sludge treatment unit are all connected with the odor treatment unit, and the generated odor is conveyed to the odor treatment unit for treatment.
As a further improvement of the utility model, the system further comprises a boiler incineration unit, wherein the UASB anaerobic reactor, the NF-DTRO reduction unit, the sludge treatment unit and the odor treatment unit are all connected with the boiler incineration unit, biogas generated by the UASB anaerobic reactor is input into the boiler incineration unit for incineration, concentrated solution after 50% reduction generated by the NF-DTRO reduction unit is input into the boiler incineration unit for back spraying and digestion, dehydrated sludge generated by the sludge treatment unit is sent into the boiler incineration unit for co-combustion, and odor after primary purification treatment in the odor treatment unit is sent into the boiler incineration unit for supporting combustion as primary air.
As a further improvement of the present utility model, the odor treatment unit comprises an acid-base spray tower for spraying to remove acidic and basic gases in the odor.
As a further improvement of the utility model, the chemical adding unit is respectively connected with the UASB anaerobic reactor, the two-stage nitrification and denitrification tank, the nanofiltration unit, the high-concentration reverse osmosis unit, the coagulating sedimentation tank, the primary nitrification and denitrification tank, the coagulating air floatation tank, the low-concentration reverse osmosis unit, the NF-DTRO decrement unit, the RO-DTRO decrement unit, the sludge treatment unit and the odor treatment unit, and is used for adding chemical agents required by the process.
As a further improvement of the utility model, the lime slurry treatment device further comprises a flue gas treatment unit, wherein the flue gas treatment unit is connected with the RO-DTRO decrement unit, and concentrated solution which is generated by the RO-DTRO decrement unit and is subjected to 50% decrement is fed into the flue gas treatment unit for recycling and digestion and is used for pulping lime slurry.
As a further improvement of the utility model, the closed circulation hyperbolic cooling tower is adopted as the circulation cooling tower unit, and the concentration ratio of the circulation cooling tower unit is controlled to be 5+/-0.5.
As a further improvement of the utility model, the inlet water conductivity of the NF-DTRO decrement unit is 20-30 ms/cm, and the highest operating pressure is 60bar; the inlet water conductivity of the RO-DTRO decrement unit is 35-55 ms/cm, and the highest operating pressure is 90bar.
Compared with the prior art, the utility model has the advantages that:
1. according to the zero-emission comprehensive treatment system for the wastewater of the household garbage incineration power plant, provided by the utility model, sewage is split according to different physical and chemical properties of various types of wastewater of the household garbage incineration power plant, and three sets of wastewater treatment units, namely, a percolate treatment unit, a household sewage treatment unit and a low-concentration inorganic wastewater treatment unit, are arranged according to the quality characteristics of inflow water, so that all the wastewater generated by the household garbage incineration power plant can be treated by corresponding wastewater processes in the plant, and the process pertinency is strong; the running cost of the percolate process system is about 50 yuan/ton, the running cost of the domestic sewage system is about 10 yuan/ton, the domestic sewage, the low-concentration inorganic wastewater and the garbage percolate are treated separately, the overall running cost is relatively low, and the production amount of the concentrated solution is relatively low.
2. According to the zero-emission comprehensive treatment system for the wastewater of the household garbage incineration power plant, concentrated solution classification and decrement treatment is carried out on concentrated solution generated by various wastewater membrane processes of the household garbage incineration power plant, and the concentrated solution is further decremented by 50%; on one hand, the clear liquid recycling amount of the wastewater is increased, and the wastewater can be used for supplementing water for a circulating cooling tower; on the other hand, the production amount of the concentrated solution in the whole plant is reduced, and the absorption and disposal pressure of the concentrated solution in the plant is reduced.
3. The zero-emission comprehensive treatment system for the wastewater of the household garbage incineration power plant fully plays the role of cooperative treatment of each unit in the household garbage incineration power plant, and realizes zero emission of pollutants in the whole plant wastewater treatment process. Concentrate generated by the wastewater film treatment process is reduced by 50% through a concentrate reduction unit and then is treated and consumed cooperatively through an in-plant boiler incineration unit and a flue gas treatment unit, so that zero emission of wastewater of the whole plant is realized; sludge generated by wastewater treatment is dehydrated by a sludge treatment unit and then is sent to a boiler incineration unit to be mixed with household garbage for treatment, so that zero discharge of the sludge is realized; the odor generated in the wastewater treatment process is sent to the boiler incineration unit as primary air for combustion supporting after passing through the two-stage acid-base spray tower, so that zero emission of the odor is realized.
4. According to the domestic waste incineration power plant wastewater zero-emission comprehensive treatment system, the concentration ratio of circulating water is reasonably controlled, so that wastewater zero emission of the whole plant is finally realized, the concentration ratio of the circulating water is controlled to be about 5, and long-term stable operation of a circulating water system in the plant is ensured. The sewage of the cooling tower is treated by a low-concentration inorganic sewage treatment unit to remove pollutants and salt, the clear liquid after the whole factory wastewater treatment reaches the standard of urban sewage recycling industrial water quality (GB/T19923-2005) and is recycled to the cooling tower to be used as water supplementing, and the concentration ratio of the circulating water can be controlled by dynamically adjusting the sewage discharge capacity, evaporation capacity, recycling amount and fresh water supplementing amount of the cooling tower.
Drawings
Fig. 1 is a schematic diagram of the composition principle of the wastewater zero-emission comprehensive treatment system of the household garbage incineration power plant.
FIG. 2 is a schematic diagram of the principle of composition of the percolate treatment unit according to the utility model.
FIG. 3 is a schematic diagram of the principle of the composition of the domestic sewage treatment unit of the present utility model.
FIG. 4 is a schematic diagram of the principle of the low-concentration inorganic sewage treatment unit of the present utility model.
FIG. 5 is a schematic diagram showing the principle of the composition of the concentrate reducing unit of the present utility model.
FIG. 6 is a schematic diagram of the principle of the constitution of the sludge treatment unit in the present utility model.
FIG. 7 is a schematic diagram showing the principle of the composition of the odor treatment unit of the present utility model.
Fig. 8 is a schematic diagram of the composition principle of the drug adding unit in the present utility model.
Legend description: 1. a percolate treatment unit; 11. a deslagging grille machine; 12. a percolate regulating tank; 13. UASB anaerobic reactor; 14. a two-stage nitrification and denitrification tank; 15. an external ultrafiltration unit; 16. a nanofiltration unit; 17. a high-concentration reverse osmosis unit; 18. a clear liquid pool; 2. a domestic sewage treatment unit; 22. a hair collector; 23. a domestic sewage regulating tank; 24. a coagulating sedimentation tank; 25. a primary nitrification and denitrification tank; 26. a built-in ultrafiltration unit; 3. a low-concentration inorganic sewage treatment unit; 31. a low-concentration inorganic sewage regulating tank; 32. a coagulation floatation tank; 33. a sand filter; 34. a middle pool; 35. an ultrafiltration unit; 36. a low-concentration reverse osmosis unit; 4. a concentrate decrement unit; 41. NF-DTRO decrement unit; 42. RO-DTRO decrement unit; 5. a sludge treatment unit; 6. an odor treatment unit; 7. a medicine adding unit; 8. a circulating cooling tower unit; 9. a boiler incineration unit; 10. and a flue gas treatment unit.
Detailed Description
The utility model is further described below in connection with the drawings and the specific preferred embodiments, but the scope of protection of the utility model is not limited thereby.
Example 1
As shown in fig. 1 to 8, the wastewater zero-emission integrated treatment system for a household garbage incineration power plant of the present utility model comprises: the device comprises a percolate treatment unit 1, a domestic sewage treatment unit 2, a low-concentration inorganic sewage treatment unit 3, a medicament adding unit 7 and a circulating cooling tower unit 8. The reagent adding unit 7 is used for adding various chemical reagents in the wastewater treatment process; the circulating cooling tower unit 8 is an industrial water cooling device for the living garbage incineration power plant.
As shown in fig. 1 and 2, in this embodiment, the leachate treatment unit 1 is used for treating landfill leachate and discharge hall flushing water, and includes a deslagging grille machine 11, a leachate adjusting tank 12, a UASB anaerobic reactor 13, a two-stage nitrification and denitrification tank 14, an external ultrafiltration unit 15, a nanofiltration unit 16, a high-concentration reverse osmosis unit 17 and a clear liquid tank 18, which are sequentially connected, and the treated produced water reaches the standard of urban sewage recycling industrial water quality (GB/T19923-2005). The output end of the clear liquid pond 18 is connected with the input end of the circulating cooling tower unit 8, the output end of the circulating cooling tower unit 8 is connected with the input end of the low-concentration inorganic sewage treatment unit 3, and clear liquid output by the circulating cooling tower unit 8 can be used as the production water of the low-concentration inorganic sewage treatment unit 3.
As shown in fig. 1 and 3, in this embodiment, the domestic sewage treatment unit 2 is used for treating domestic sewage in a factory, flushing and draining of a refuse transportation approach bridge, flushing and draining of a wagon balance area, and draining of initial rainwater, and includes a slag removal grille machine 11, a hair collector 22, a domestic sewage regulating tank 23, a coagulating sedimentation tank 24, a primary nitrification and denitrification tank 25 and a built-in ultrafiltration unit 26, which are sequentially connected, and an output end of the built-in ultrafiltration unit 26 is connected with an input end of the clear liquid tank 18. The treated produced water reaches the standard of the water quality of industrial water for urban sewage recycling (GB/T19923-2005), and is recycled to the circulating cooling tower unit 8 to be used as the produced water.
As shown in fig. 1 and 4, in the present embodiment, the low-concentration inorganic sewage treatment unit 3 is used for treating the circulating cooling tower sewage, reverse osmosis concentrated water in the process of preparing demineralized water and boiler plant sewage; the device comprises a low-concentration inorganic sewage regulating tank 31, a coagulation air floatation tank 32, a sand filter 33, an intermediate water tank 34, an ultrafiltration unit 35 and a low-concentration reverse osmosis unit 36 which are connected in sequence; the output of the low concentration reverse osmosis unit 36 is connected to the input of the permeate pond 18. The treated produced water reaches the standard of the water quality of industrial water for urban sewage recycling (GB/T19923-2005), and is recycled to the circulating cooling tower unit 8 to be used as the produced water.
The water quality requirement of the inlet water of the percolate treatment unit 1 is as follows: CODcr 40000-80000 mg/L, BOD 5 :20000～30000mg/L、NH 4 -N:1500～3000mg/L、TN:2000～4000mg/L、SS:8000～12000mg/L、pH:4～8。
The water quality requirement of the inlet water of the domestic sewage treatment unit 2 is as follows: CODcr 300-500 mg/L, NH 4 -N:40～60mg/L、SS:800～1000mg/L、pH:6～8。
The water quality requirement of the inlet water of the low-concentration inorganic sewage treatment unit 3: CODcr 40-60 mg/L, BOD 5 :15～30mg/L、TD:3～4ms/cm、SS:400～800mg/L。
As shown in fig. 1 and 5, in this embodiment, the apparatus further includes a concentrate decrement unit 4, where the concentrate decrement unit 4 includes an NF-DTRO decrement unit 41 and an RO-DTRO decrement unit 42, and is configured to further decrement the concentrate produced by the membrane system, and all use high-pressure disc-tube membrane units. The input end of the NF-DTRO reduction unit 41 is connected with the nanofiltration unit 16, and the NF-DTRO reduction unit 41 is used for treating nanofiltration concentrated solution generated by the leachate treatment unit 1; the input end of the RO-DTRO decrement unit 42 is respectively connected with the high concentration reverse osmosis unit 17 and the low concentration reverse osmosis unit 36, and the RO-DTRO decrement unit 42 is used for treating the high concentration reverse osmosis concentrated solution generated by the percolate treatment unit 1 and the low concentration reverse osmosis concentrated solution generated by the low concentration inorganic sewage treatment unit 3. The yield of the produced water of the NF-DTRO reduction unit 41 and the RO-DTRO reduction unit 42 is 50%, and the produced water enters the clear liquid pool 18.
Further, the inlet water conductivity of the NF-DTRO decrement unit 41 is 20-30 ms/cm, and the highest operating pressure is 60bar; the inlet water conductivity of the RO-DTRO decrement unit 42 is 35-55 ms/cm, and the highest operation pressure is 90bar. The front end of the concentrate decrement unit 4, which is fed with water, is subjected to acid regulation through the medicament adding unit 7, and the pH value is regulated to be 5.9-6.5, so that serious scaling of the decrement film unit is prevented.
As shown in fig. 1 and 6, the present embodiment further includes a sludge treatment unit 5, where the sludge treatment unit 5 is used for treating various types of sludge generated in the wastewater process. The UASB anaerobic reactor 13, the two-stage nitrification and denitrification tank 14, the coagulating sedimentation tank 24, the primary nitrification and denitrification tank 25 and the coagulating air floatation tank 32 are all connected with the sludge treatment unit 5, and the produced sludge is all conveyed to the sludge treatment unit 5 for treatment. The clear liquid generated by the sludge treatment unit 5 is conveyed to a two-stage nitrification and denitrification tank 14 for secondary use.
Specifically, the residual sludge of the anaerobic reactor 13 and the two-stage nitrification and denitrification tank 14 enters the sludge treatment unit 5, the residual sludge of the coagulating sedimentation 24 and the primary nitrification and denitrification tank 25 enters the sludge treatment unit 5, the sludge generated by the coagulating air floatation 32 enters the sludge treatment unit 5, the water content is controlled to be less than or equal to 80% after centrifugal dehydration, the dehydrated sludge is sent into the boiler incineration unit 9 to be subjected to blending treatment with household garbage, and the upper layer dehydrated clear liquid returns to the nitrification tank of the percolate treatment unit 1.
As shown in fig. 1 and 7, in this embodiment, the apparatus further includes an odor treatment unit 6, where the odor treatment unit 6 is configured to collect various types of odors generated in the wastewater treatment process, and the percolate adjusting tank 12, the two-stage nitrification and denitrification tank 14, the domestic sewage adjusting tank 23, the low-concentration inorganic sewage adjusting tank 31, and the sludge treatment unit 5 are all connected to the odor treatment unit 6, and the generated odors are all conveyed to the odor treatment unit 6 for treatment.
Specifically, the leachate regulating tank 12, the domestic sewage regulating tank 23, the low-concentration inorganic sewage regulating tank 31, the two-stage nitrification and denitrification tank 14 and the sludge treatment unit 5 are uniformly collected to the odor treatment unit 6 through a variable frequency fan and a pipeline, and the odor is sent to the boiler incineration unit 9 through an odor air pipe to be used as primary air for supporting combustion after the gases such as hydrogen sulfide, ammonia and the like in the odor are primarily removed through a two-stage acid-base spray tower (not shown in the figure).
In this embodiment, the device further comprises a boiler incineration unit 9, wherein the boiler incineration unit is a household garbage incineration device and is a mechanical grate furnace. The UASB anaerobic reactor 13, the NF-DTRO reduction unit 41, the sludge treatment unit 5 and the odor treatment unit 6 are all connected with the boiler incineration unit 9, biogas generated by the UASB anaerobic reactor 13 is sent to the boiler incineration unit 9 for incineration after desulfurization pretreatment, concentrated solution after 50% reduction generated by the NF-DTRO reduction unit 41 is input into the boiler incineration unit 9 for back spraying and digestion, dehydrated sludge generated by the sludge treatment unit 5 is sent to the boiler incineration unit 9 for blending combustion, and odor after preliminary purification treatment in the odor treatment unit 6 is sent into the boiler incineration unit 9 for combustion supporting as primary air.
As shown in fig. 1 and 8, in this embodiment, the chemical adding unit 7 is respectively connected to the UASB anaerobic reactor 13, the two-stage nitrification-denitrification tank 14, the nanofiltration unit 16, the high-concentration reverse osmosis unit 17, the coagulation sedimentation tank 24, the primary nitrification-denitrification tank 25, the coagulation air floatation tank 32, the low-concentration reverse osmosis unit 36, the NF-DTRO reduction unit 41, the RO-DTRO reduction unit 42, the sludge treatment unit 5, and the odor treatment unit 6, and is used for adding chemical chemicals required by the process.
In this embodiment, the chemical agents added by the agent adding unit 7 include ferric trichloride, an antifoaming agent, hydrochloric acid, a scale inhibitor, liquid alkali, a flocculant and the like. Wherein, ferric trichloride is added to the front end of the UASB anaerobic reactor 13, and is used for reducing free hydrogen sulfide in an anaerobic system and reducing toxic action on anaerobic bacteria; the defoaming agent is added into the aerobic biochemical tanks of the two-stage nitrification and denitrification tank 14 and the one-stage nitrification and denitrification tank 25, and the defoaming agent is only required to be added under the condition of more abnormal operation foam of a biochemical system; hydrochloric acid and a scale inhibitor are added to the front ends of membrane units such as a low-concentration reverse osmosis unit 36, a nanofiltration unit 16, a high-concentration reverse osmosis unit 17, an NF-DTRO reduction unit 41, an RO-DTRO reduction unit 42 and the like, and are used for slowing down the scale of the membrane units; hydrochloric acid and liquid alkali are respectively added into an acid-base absorption tower of the odor treatment unit 6; flocculant is added to the front ends of the sludge treatment unit 5, the coagulating sedimentation tank 24 and the coagulating air floatation tank 32 for flocculating sludge.
In this embodiment, the sewage from the circulating cooling tower unit 8 is the water from the low-concentration inorganic sewage treatment unit 3, and the supernatant produced by the percolate treatment unit 1, the domestic sewage treatment unit 2, the low-concentration inorganic sewage treatment unit 3 and the concentrate decrement unit 4 is mixed in the supernatant pool 18, and then is recycled to the circulating cooling tower unit 8 as the water supplement. The circulating cooling tower unit 8 is an industrial water cooling device for the living garbage incineration power plant, and adopts a closed circulation hyperbolic cooling tower, so as to ensure long-term stable operation of a circulating water system in the plant, the concentration ratio of the circulating cooling tower unit is controlled to be about 5, and the sewage discharge amount and the water supplementing amount of the cooling tower are adjusted according to the water quality index of the circulating water.
In this embodiment, the device further comprises a flue gas treatment unit 10, the flue gas treatment unit 10 is connected with the RO-DTRO decrement unit 42, and concentrated solution which is generated by the RO-DTRO decrement unit 42 and is subjected to 50% decrement enters the flue gas treatment unit 10 for recycling and digestion, so that the device is used for pulping lime slurry. The flue gas treatment unit 10 is used as a co-treatment place of byproduct pollutant concentrated solution in the wastewater treatment process, and the flue gas treatment unit 10 is specifically a flue gas purification treatment device, such as a lime slurry preparation device in a flue gas deacidification system.
Example 2
A treatment scale of a household garbage incineration power plant is 5000 tons/day, sewage and sewage are split according to different physicochemical properties of wastewater in the plant, and three wastewater treatment systems, namely a leachate treatment system, a domestic sewage treatment system and a low-concentration inorganic sewage treatment system, are designed.
Wherein the treatment scale of the percolate treatment system is 1800m 3 And/d, which is used for treating landfill leachate and discharge hall flushing water and is designed for water quality requirement: CODcr 40000-80000 mg/L, BOD 5 :20000～30000mg/L、NH 4 1500-3000 mg/L, TN:2000-4000 mg/L, SS:8000-12000 mg/L, pH:4-8; treatment scale of domestic sewage treatment system 700m 3 And/d, which is used for treating factory domestic sewage, waste transportation approach bridge flushing drainage, wagon balance area flushing drainage and initial rainwater drainage, and is designed for water inlet quality requirements: CODcr 300-500 mg/L, NH 4 -N:40～60mg/L, SS, 800-1000 mg/L, pH, 6-8; treatment scale of low-concentration inorganic sewage treatment system is 1200m 3 And/d, which is used for treating reverse osmosis concentrated water and boiler workshop drainage in the preparation process of circulating cooling tower sewage and desalted water, and designing the water quality requirement of inlet water: CODcr 40-60 mg/L, BOD 5 15-30 mg/L, TD, 3-4 ms/cm and 400-800 mg/L SS. After the wastewater system in the embodiment 1 is adopted to treat the wastewater, the produced water of the three wastewater treatment systems can reach the standard of urban wastewater recycling industrial water quality (GB/T19923-2005) and can be recycled to a cooling tower to be used as the produced water.
In this example, the nanofiltration unit design run yield of the percolate treatment system was 85% and the nanofiltration concentrate produced was about 280m 3 And/d, the design and operation yield of the reverse osmosis unit is 80%, and the generated high-concentration reverse osmosis concentrated solution is about 316m 3 And/d, the designed operation yield of the reverse osmosis unit of the low-concentration inorganic sewage treatment system is 90%, and the generated low-concentration reverse osmosis concentrated solution is about 120m 3 And/d. The embodiment is provided with a set of 360m 3 NF-DTRO reduction unit with/d processing capacity and 500m set 3 And the design operation yield of the RO-DTRO reduction unit with the treatment capacity/d is 50%.
In the embodiment, after the treatment is performed by adopting the household garbage incineration power plant wastewater zero-emission comprehensive treatment system in the embodiment 1, the concentrated solution generated by the wastewater membrane treatment process is reduced by 50% through the concentrated solution reduction unit and then is treated and consumed in a synergistic manner by the in-plant boiler incineration unit and the smoke treatment unit, so that the zero emission of wastewater in the whole plant is realized; sludge generated by wastewater treatment is dehydrated by a sludge treatment unit and then is sent to a boiler incineration unit to be mixed with household garbage for treatment, so that zero discharge of the sludge is realized; the odor generated in the wastewater treatment process is sent to the boiler incineration unit as primary air for combustion supporting after passing through the two-stage acid-base spray tower, so that zero emission of the odor is realized.
While the utility model has been described with reference to preferred embodiments, it is not intended to be limiting. Any person skilled in the art can make many possible variations and modifications to the technical solution of the present utility model or equivalent embodiments using the method and technical solution disclosed above without departing from the spirit and technical solution of the present utility model. Therefore, any simple modification, equivalent substitution, equivalent variation and modification of the above embodiments according to the technical substance of the present utility model, which do not depart from the technical solution of the present utility model, still fall within the scope of the technical solution of the present utility model.
Claims (10)
1. The utility model provides a domestic waste burns power plant's waste water zero release integrated treatment system which characterized in that includes: the device comprises a percolate treatment unit (1), a domestic sewage treatment unit (2), a low-concentration inorganic sewage treatment unit (3), a medicament adding unit (7) and a circulating cooling tower unit (8); the chemical adding unit (7) is used for adding various chemical chemicals in the wastewater treatment process; the circulating cooling tower unit (8) is an industrial water cooling device of the household garbage incineration power plant;
the leachate treatment unit (1) is used for treating landfill leachate and discharging hall flushing water and comprises a deslagging grille machine (11), a leachate regulating tank (12), a UASB anaerobic reactor (13), a two-stage nitrification and denitrification tank (14), an external ultrafiltration unit (15), a nanofiltration unit (16), a high-concentration reverse osmosis unit (17) and a clear liquid tank (18) which are sequentially connected, wherein the output end of the clear liquid tank (18) is connected with the input end of a circulating cooling tower unit (8), and the output end of the circulating cooling tower unit (8) is connected with the input end of a low-concentration inorganic sewage treatment unit (3);
the domestic sewage treatment unit (2) is used for treating factory domestic sewage, waste transportation approach bridge flushing drainage, wagon balance area flushing drainage and initial rainwater drainage, and comprises a deslagging grille machine (11), a hair collector (22), a domestic sewage regulating tank (23), a coagulating sedimentation tank (24), a primary nitrification and denitrification tank (25) and a built-in ultrafiltration unit (26) which are sequentially connected, wherein the output end of the built-in ultrafiltration unit (26) is connected with the input end of a clear liquid tank (18);
the low-concentration inorganic sewage treatment unit (3) is used for treating reverse osmosis concentrated water and boiler plant drainage in the circulating cooling tower sewage and desalted water preparation process; comprises a low-concentration inorganic sewage regulating tank (31), a coagulation air floatation tank (32), a sand filter (33), an intermediate water tank (34), an ultrafiltration unit (35) and a low-concentration reverse osmosis unit (36) which are connected in sequence; the output end of the low-concentration reverse osmosis unit (36) is connected with the input end of the clear liquid pool (18).
2. The domestic waste incineration power plant wastewater zero-emission comprehensive treatment system according to claim 1, further comprising a concentrated solution decrement unit (4), wherein the concentrated solution decrement unit (4) comprises an NF-DTRO decrement unit (41) and an RO-DTRO decrement unit (42), the input end of the NF-DTRO decrement unit (41) is connected with the nanofiltration unit (16), and the NF-DTRO decrement unit (41) is used for treating nanofiltration concentrated solution generated by the leachate treatment unit (1); the input end of the RO-DTRO decrement unit (42) is respectively connected with the high-concentration reverse osmosis unit (17) and the low-concentration reverse osmosis unit (36), and the RO-DTRO decrement unit (42) is used for treating the high-concentration reverse osmosis concentrated solution generated by the percolate treatment unit (1) and the low-concentration reverse osmosis concentrated solution generated by the low-concentration inorganic sewage treatment unit (3); the yield of the produced water of the NF-DTRO decrement unit (41) and the RO-DTRO decrement unit (42) is 50%, and the produced water enters the clear liquid pool (18).
3. The system for comprehensively treating the wastewater zero emission of the household garbage incineration power plant according to claim 2, further comprising a sludge treatment unit (5), wherein the sludge treatment unit (5) is used for treating various types of sludge generated by a wastewater process; the UASB anaerobic reactor (13), the two-stage nitrification and denitrification tank (14), the coagulating sedimentation tank (24), the primary nitrification and denitrification tank (25) and the coagulating air floatation tank (32) are all connected with the sludge treatment unit (5), and the produced sludge is conveyed to the sludge treatment unit (5) for treatment; clear liquid generated by the sludge treatment unit (5) is conveyed to a two-stage nitrification and denitrification tank (14) for secondary utilization.
4. The system for the zero emission comprehensive treatment of the wastewater of the household garbage incineration power plant according to claim 3, further comprising an odor treatment unit (6), wherein the odor treatment unit (6) is used for collecting various types of odor generated in the wastewater treatment process, and the percolate regulating tank (12), the two-stage nitrification and denitrification tank (14), the household sewage regulating tank (23), the low-concentration inorganic sewage regulating tank (31) and the sludge treatment unit (5) are connected with the odor treatment unit (6), and the generated odor is conveyed to the odor treatment unit (6) for treatment.
5. The integrated treatment system for zero emission of wastewater from a domestic waste incineration power plant according to claim 4, wherein the odor treatment unit (6) comprises an acid-base spray tower for spraying to remove acid and alkali gases in the odor.
6. The system for zero emission comprehensive treatment of domestic waste incineration power plant wastewater according to claim 4, further comprising a boiler incineration unit (9), wherein the UASB anaerobic reactor (13), the NF-DTRO reduction unit (41), the sludge treatment unit (5) and the odor treatment unit (6) are all connected with the boiler incineration unit (9), biogas generated by the UASB anaerobic reactor (13) is input into the boiler incineration unit (9) for incineration, concentrated solution after 50% reduction generated by the NF-DTRO reduction unit (41) is input into the boiler incineration unit (9) for back injection and digestion, dehydrated sludge generated by the sludge treatment unit (5) is sent into the boiler incineration unit (9) for blending combustion, and odor after preliminary purification treatment in the odor treatment unit (6) is sent into the boiler incineration unit (9) for combustion supporting as primary air.
7. The system for zero discharge comprehensive treatment of wastewater from a domestic waste incineration power plant according to claim 4, wherein the chemical adding unit (7) is respectively connected with a UASB anaerobic reactor (13), a two-stage nitrification and denitrification tank (14), a nanofiltration unit (16), a high-concentration reverse osmosis unit (17), a coagulation sedimentation tank (24), a one-stage nitrification and denitrification tank (25), a coagulation air floatation tank (32), a low-concentration reverse osmosis unit (36), an NF-DTRO reduction unit (41), an RO-DTRO reduction unit (42), a sludge treatment unit (5) and an odor treatment unit (6) for adding chemical agents required by the process.
8. The system for zero emission comprehensive treatment of household garbage incineration power plant wastewater according to claim 2, further comprising a flue gas treatment unit (10), wherein the flue gas treatment unit (10) is connected with an RO-DTRO decrement unit (42), and concentrated solution which is generated by the RO-DTRO decrement unit (42) and is subjected to 50% decrement is fed into the flue gas treatment unit (10) for recycling and digestion, and is used for pulping lime slurry.
9. The system for zero release comprehensive treatment of wastewater from a domestic waste incineration power plant according to any one of claims 1 to 8, wherein the circulation cooling tower unit (8) adopts a closed circulation hyperbolic cooling tower, and the concentration ratio of the circulation cooling tower unit (8) is controlled to be 5+/-0.5.
10. The domestic waste incineration power plant wastewater zero emission comprehensive treatment system according to any one of claims 2 to 8, wherein the inlet water conductivity of the NF-DTRO abatement unit (41) is 20-30 ms/cm, and the maximum operating pressure is 60bar; the inlet water conductivity of the RO-DTRO decrement unit (42) is 35-55 ms/cm, and the highest operating pressure is 90bar.
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