CN108928860B - Domestic sewage treatment device and treatment method thereof - Google Patents
Domestic sewage treatment device and treatment method thereof Download PDFInfo
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- CN108928860B CN108928860B CN201810833858.4A CN201810833858A CN108928860B CN 108928860 B CN108928860 B CN 108928860B CN 201810833858 A CN201810833858 A CN 201810833858A CN 108928860 B CN108928860 B CN 108928860B
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- 239000010865 sewage Substances 0.000 title claims abstract description 195
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000010802 sludge Substances 0.000 claims abstract description 136
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 94
- 238000006243 chemical reaction Methods 0.000 claims abstract description 21
- 239000007789 gas Substances 0.000 claims abstract description 18
- 239000002918 waste heat Substances 0.000 claims abstract description 15
- 239000000047 product Substances 0.000 claims description 22
- 230000035484 reaction time Effects 0.000 claims description 16
- 238000001035 drying Methods 0.000 claims description 14
- 238000003860 storage Methods 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 10
- 239000000706 filtrate Substances 0.000 claims description 8
- 239000007791 liquid phase Substances 0.000 claims description 8
- 239000007790 solid phase Substances 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 6
- 238000002309 gasification Methods 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims description 4
- 238000001027 hydrothermal synthesis Methods 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 description 7
- 239000000571 coke Substances 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 238000006065 biodegradation reaction Methods 0.000 description 3
- 239000012263 liquid product Substances 0.000 description 3
- 230000005415 magnetization Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
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- 230000009471 action Effects 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000010335 hydrothermal treatment Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 241001148471 unidentified anaerobic bacterium Species 0.000 description 2
- 102000004190 Enzymes Human genes 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000007885 magnetic separation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000011112 process operation Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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- 230000001988 toxicity Effects 0.000 description 1
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- 239000002912 waste gas 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/54—Improvements relating to the production of bulk chemicals using solvents, e.g. supercritical solvents or ionic liquids
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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)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a domestic sewage treatment device and a treatment method thereof, wherein the domestic sewage treatment device comprises a first sewage tank, a first centrifugal pump, a three-stage filter connected with the first centrifugal pump, a sewage treatment system and a sludge treatment system which are connected with the three-stage filter; the sludge treatment system comprises a sludge collection bin, a hydrothermal reactor, a fourth filter, a sludge dryer and a sludge semicoke collection bin which are connected in sequence, wherein the hydrothermal reactor is connected with the sludge dryer at the same time; the sewage treatment system comprises a second sewage tank, a sewage pre-reactor, a first supercritical water reactor and a second supercritical water reactor; and the waste heat of the first supercritical water reactor product provides reaction energy for the sewage pre-reactor, the hydrothermal reactor and the sludge dryer in sequence. The invention solves the problem of direct pollution of sludge to the environment, and simultaneously degrades organic matters in the sewage into combustible gas capable of being directly combusted, thereby realizing efficient treatment and resource utilization of domestic sewage.
Description
Technical Field
The invention belongs to the technical field of domestic sewage treatment, and particularly relates to a domestic sewage treatment device and a treatment method thereof.
Background
Domestic sewage is mainly discharged sewage generated by kitchen water, toilet water, washing water and the like, and although the toxicity and the harmfulness of the domestic sewage are less than those of industrial sewage, the random discharge of the domestic sewage can also generate obvious harm to the environment. The traditional domestic sewage treatment mode adopts a biodegradation conversion mechanism and a solid-liquid separation mechanism to purify domestic sewage, and simultaneously, harmful substances and pollutants in the domestic sewage are settled into sludge.
Chinese CN201611150755.5 discloses a domestic sewage treatment system, which comprises a domestic sewage treatment system, the domestic sewage treatment system comprises a water collecting tank, an anaerobic tank, an anoxic tank, a contact oxidation tank, a sedimentation tank, a sludge concentration tank and a disinfection tank, and the water collecting tank collects various domestic sewage; anaerobic bacteria are contained in the anaerobic tank; the contact oxidation pond contains a biological film; sewage in the water collecting tank flows into the anaerobic tank, and is fully combined with anaerobic bacteria under the stirring action of the stirrer; sewage in the anaerobic tank flows into the anoxic tank to perform denitrification; the sludge at the bottom layer of the anoxic tank is conveyed to the anaerobic tank through a return pipe, and the supernatant at the upper layer of the anoxic tank flows into the contact oxidation tank to perform blast aeration on sewage in the contact oxidation tank. The sewage treatment system does not treat and recycle harmful gases in sewage, and the utilization rate of the product obtained by the final treatment of the sewage is low, so that secondary pollution is easy to generate.
Chinese CN201711369082.7 discloses a domestic sewage treatment system, which comprises a magnetization treatment chamber, an anaerobic treatment chamber, an aerobic treatment chamber and a membrane treatment chamber which are sequentially communicated according to the sewage flow direction; the film processing chamber is also connected to the magnetization processing chamber. The invention also provides a treatment method of the sewage treatment system. The domestic sewage treatment system has a simple and compact structure and small occupied area, and can shorten the sewage treatment time and improve the sewage treatment efficiency by adopting a magnetic separation mode through the magnetization treatment chamber; the sewage is alternately subjected to anoxic and aerobic environments through the anaerobic treatment chamber and the aerobic treatment chamber, so that the removal of pollutants in the sewage, especially C, N-containing substances, is further enhanced; the heavy metal impurities contained in the sewage and the organic matters in chemical pollution are further effectively removed through the membrane treatment chamber. The sewage treatment system purifies water in the sewage treatment process, and sludge and waste gas generated in the treatment process are not further treated and recycled.
The traditional domestic sewage treatment process flow generally leads sludge in sewage to be chemically degraded through biodegradation or solid-liquid separation, forms suspended matters with small particles through degrading enzyme action, and then utilizes a filter screen to treat the sewage with the suspended matters so as to achieve the effect of solid-liquid separation, and meanwhile, the sewage reaches the standard discharge. However, the treated sludge contains a large amount of toxic substances, is easy to cause secondary pollution to water, has bad smell and is harmful to human health. In addition, the sludge contains a large amount of organic matters, and the organic matters contained in the sludge cannot be effectively utilized, and the biodegradation cannot be sufficiently performed on the organic matters. Therefore, there is an urgent need to design a domestic sewage treatment apparatus and a treatment method thereof to solve the above problems.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a domestic sewage treatment device and a treatment method thereof, wherein the sludge treatment system is used for drying sludge into sludge semicoke, so that the direct pollution of the sludge to the environment is solved, and secondary pollution to water body is avoided in the treatment process; the sewage treatment system is used for purifying sewage to reach the dischargeable standard, and simultaneously organic matters in the sewage are degraded into combustible gas capable of being directly combusted, so that efficient treatment and resource utilization of domestic sewage are realized.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention provides a domestic sewage treatment device which comprises a first sewage tank, a first centrifugal pump, a three-stage filter connected with the first centrifugal pump, a sewage treatment system and a sludge treatment system, wherein the sewage treatment system and the sludge treatment system are connected with the three-stage filter; the three-stage filter comprises a first filter, a second filter and a third filter which are arranged in parallel; the sludge treatment system comprises a sludge collection bin, a hydrothermal reactor, a fourth filter, a sludge dryer and a sludge semicoke collection bin which are connected in sequence, wherein the hydrothermal reactor is connected with the sludge dryer at the same time; the sewage treatment system comprises a second sewage tank for storing filtrate, a sewage pre-reactor connected with the second sewage tank, a first supercritical water reactor connected with the sewage pre-reactor, a second supercritical water reactor connected with the fourth filter and the sludge dryer for collecting and treating sewage, a cooler, a back pressure valve, a gas-water separator, a water tank and a pressure-resistant air storage tank; heating units are respectively arranged in the first supercritical water reactor and the second supercritical water reactor; and the waste heat of the first supercritical water reactor product provides reaction energy for the sewage pre-reactor, the hydrothermal reactor and the sludge dryer in sequence.
The invention is thatThe working principle of the domestic sewage treatment device is as follows: the domestic sewage treatment device can realize the standard discharge of domestic sewage, obtain combustible gas and eliminate the pollution of sludge to the environment, thereby realizing the recycling treatment of the domestic sewage. The invention stirs the domestic sewage collected by the pipe network in the stirrer, discharges the sewage into three-stage filters which are operated in parallel through a first centrifugal pump, filters the sewage through a filter screen in the filters, sends the filtrate to a second sewage tank, and sends the sludge to a sludge collection bin. The filtrate in the second sewage tank is preheated through a sewage pre-reactor, and then enters the first supercritical water reactor to react, the first supercritical water reactor product is sequentially sent into a dividing wall type sewage pre-reactor, a hydrothermal reactor and a sludge dryer to recycle waste heat, the first supercritical water reactor product after recycling the waste heat is mixed with the filtrate in the fourth filter and sent into the second supercritical water reactor, the second supercritical water reactor reaction product is processed through a cooler cooling, a back pressure valve and a gas-water separator, and then the gas product is sent into a pressure-resistant gas storage tank, and the liquid product is pumped into a water tank. And after the sludge is subjected to hydrothermal reaction, filtering by a fourth filter screen, drying in a sludge dryer, and then sending the sludge into a sludge semicoke collecting bin, wherein the waste heat of the first supercritical water reactor product provides reaction energy for the sewage pre-reactor, the hydrothermal reactor and the sludge dryer in sequence. The domestic sewage treatment capacity of the device is 20-200 m 3 /h，1m 3 20-50 kg of sludge semicoke can be obtained after domestic sewage treatment, and the size is 2-4 m 3 And (3) combustible gas.
The first supercritical water reactor is provided with a heating unit, the heating unit is used for heating in an auxiliary way by a resistance wire, the reaction raw material is a sewage pre-reactor product, and the first supercritical water reactor reaction product is sent to a dividing wall type sewage pre-reactor to provide energy for the sewage pre-reactor; the second supercritical water reactor is provided with resistance wire auxiliary heating, the reaction raw materials are liquid filtered by a fourth filter after the hydrothermal reactor reacts, and the first supercritical water reactor product which is recycled by waste heat is sent to a cooler for feeding after the second supercritical water reactor reactsPerforming cooling treatment; the pressure-resistant gas storage tank is used for storing the combustible gas prepared by the second supercritical water reactor, and the main component of the pressure-resistant gas storage tank is H 2 、CO、CH 4 、C 2 ～C 3 Etc.
Preferably, a first gate valve, a second gate valve and a third gate valve are respectively connected between the first centrifugal pump and the first filter, the second filter and the third filter; a first lifter, a first conveyor, a second lifter, a second conveyor, a third lifter and a third conveyor which are used for conveying the filtered sludge into the sludge collection bin are respectively arranged among the first filter, the second filter, the third filter and the sludge collection bin; a fourth lifting machine and a fourth conveyor are arranged between the fourth filter and the sludge dryer.
Preferably, a first filter screen, a second filter screen, a third filter screen and a fourth filter screen are respectively arranged in the first filter, the second filter, the third filter and the fourth filter; the apertures of the first filter screen, the second filter screen and the third filter screen are 30-50 mu m.
Preferably, a screw conveyor for conveying the sludge to avoid solidification of the sludge under the condition of long time is arranged between the sludge collection bin and the hydrothermal reactor; the sludge semi-coke collecting bin is characterized in that a scraper conveyor is arranged between the sludge dryer and the sludge semi-coke collecting bin, and the scraper conveyor sends sludge semi-coke dried by the sludge dryer into the sludge semi-coke collecting bin for storage.
Preferably, a second centrifugal pump for conveying sewage into the sewage pre-reactor is arranged between the second sewage tank and the sewage pre-reactor.
Preferably, a stirrer is arranged in the first sewage tank.
The invention also provides a treatment method of the domestic sewage treatment device, which comprises the following steps:
(1) Separating liquid phase and solid phase of sewage: the first filter, the second filter and the third filter are used for parallel operation to separate sewage, the separated liquid-phase sewage is conveyed to a second sewage tank, and the separated solid-phase sludge is conveyed to a sludge collection bin;
(2) The sludge semicoke preparation, namely, conveying sludge in a sludge collection bin to a hydrothermal reactor through a screw conveyor to react to obtain a sludge semicoke wet sample, and then carrying out preliminary filtration through a fourth filter, and conveying the sludge semicoke wet sample to a sludge dryer through a fourth elevator and a fourth conveyor to obtain dried sludge semicoke;
(3) Supercritical water gasification reaction of sewage: the sewage in the second sewage tank is sent to a sewage pre-reactor for preliminary reaction and then sent to a first supercritical water reactor for reaction; and the liquid obtained by filtering the sludge through a fourth filter after the hydrothermal reaction and the product of the first supercritical water reactor are respectively sent to a second supercritical water reactor for reaction after waste heat recovery and utilization, and the product is stored in the pressure-resistant gas storage tank and the water tank after being cooled by a cooler and processed by a gas-liquid separator.
(4) Waste heat recovery and utilization: the waste heat of the first supercritical water reactor product provides reaction energy for the sewage pre-reactor, the hydrothermal reactor and the sludge dryer in sequence.
By utilizing the device and the method thereof, the combustible gas can be obtained while the high-efficiency treatment of domestic sewage is realized, and the sludge can be subjected to the hydrothermal treatment to prepare the sludge semicoke.
Preferably, in the step (1), the maximum total load capacity of the first filter, the second filter and the third filter for treating domestic sewage is 250m 3 /h。
Preferably, in step (2), the hydrothermal reactor is operated under the following conditions: the water content of the sludge raw material is 65-80%, the temperature is 170-240 ℃, the pressure is 0.8-3.3 MPa, and the reaction time is 10-15 min; the sludge dryer has the working conditions that: the drying temperature is 110-120 ℃ and the drying time is 0.8-1 h.
Preferably, in step (3), the working conditions of the sewage pre-reactor are as follows: the temperature is 200-300 ℃ and the pressure is 22.5-23.5MPa, the reaction time is 2-5 s; the working conditions of the first supercritical water reactor are as follows: the temperature is 500-550 ℃, the pressure is 22.5-23.5 MPa, and the reaction time is 5-10 s; the working conditions of the second supercritical water reactor are as follows: the temperature is 500-550 ℃, the pressure is 22.5-23.5 MPa, and the reaction time is 10-15 s; the parameters of the pressure-resistant air storage tank are as follows: single unit volume 10.0m 3 The highest withstanding pressure is 2.5MPa; the volume of the pool is 800-1000 m 3 。
Wherein the sludge and the sewage separated in the step (1) are used in the step (2) and the step (3), respectively. In the step (3), the first supercritical water reactor and the second supercritical water reactor are self-heating systems, and the resistance wire heating only supplements part of heat for the initial reaction stage of the first supercritical water reactor and the second supercritical water reactor.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention deeply utilizes domestic sewage, obtains sludge semicoke by adopting a hydrothermal treatment mode on solid-phase sludge, degrades sewage by adopting a two-stage supercritical water gasification reactor on liquid-phase sewage and simultaneously obtains combustible gas, and adds a waste heat utilization process in the treatment process;
2. when the domestic sewage liquid phase and the solid phase are separated, the three-stage parallel connection mode is considered, so that the high-load treatment requirement can be met, the maintenance is convenient, and the stainless steel filter screen filtering mode is also convenient for actual process operation;
3. in the sewage supercritical water gasification reaction process, a sewage preheater, a first supercritical water reactor and a second supercritical water reactor are connected in series and coupled, so that the sewage degradation degree is high, and the sewage quality after treatment can reach the national standard emission standard;
4. the energy required by the sewage pre-reactor, the hydrothermal reactor and the sludge dryer of the device is provided by the first supercritical water reactor, the main reaction stage of the first supercritical water reactor and the second supercritical water reactor is a self-heating system, and the whole energy consumption is low;
5. the invention can be used in the high-efficiency placeThe COD is treated by domestic sewage with the concentration of less than 1500mg/L, and the components of gas products are as follows: 50-55 vol.% H 2 、12～15vol.％CO、15～20vol.％CH 4 、10～15vol.％CO 2 、3～5vol.％C 2 ～C 3 The gas heat value product can reach 15MJ/m 3 。
6. The device has the advantages of simple treatment process, low energy consumption, high degradation efficiency, low cost and the like, and is suitable for large-scale centralized production.
Drawings
FIG. 1 is a schematic diagram of a domestic sewage treatment apparatus according to the present invention;
in the figure: 1. a first lagoon; 2. a stirrer; 3. a first centrifugal pump; 4. a first gate valve; 5. a second gate valve; 6. a third gate valve; 7. a first filter; 8. a first filter screen; 9. a second filter; 10. a second filter screen; 11. a third filter; 12. a third filter screen; 13. a first elevator; 14. a second elevator; 15. a third elevator; 16. a first conveyor; 17. a second conveyor; 18. a third conveyor; 19. a sludge collection bin; 20. a screw conveyor; 21. a hydrothermal reactor; 22. a fourth filter; 23. a fourth filter screen; 24. a fourth elevator; 25. a fourth conveyor; 26. a sludge dryer; 27. a scraper conveyor; 28. a sludge semicoke collecting bin; 29. a second lagoon; 30. a second centrifugal pump; 31. a sewage pre-reactor; 32. a first supercritical water reactor; 33. a second supercritical water reactor; 34. a cooler; 35. a back pressure valve; 36. a gas-water separator; 37. a third centrifugal pump; 38. a pool; 39. pressure-resistant air storage tank.
Detailed Description
The following description of the present invention will be made clearly and fully, and it is apparent that the embodiments described are only some, but not all, of the embodiments of the present invention. All other embodiments, which can be made by one of ordinary skill in the art without undue burden on the person of ordinary skill in the art based on embodiments of the present invention, are within the scope of the present invention.
The invention relates to a domestic sewage treatment device which comprises a first sewage tank 1, a first centrifugal pump 3, a three-stage filter connected with the first centrifugal pump 3, a sewage treatment system and a sludge treatment system which are connected with the three-stage filter; the three-stage filter comprises a first filter 7, a second filter 9 and a third filter 11 which are arranged in parallel; the sludge treatment system comprises a sludge collection bin 19, a hydrothermal reactor 21, a fourth filter 22, a sludge dryer 26 and a sludge semicoke collection bin 28 which are connected in sequence, wherein the hydrothermal reactor 21 is connected with the sludge dryer 26 at the same time; the sewage treatment system comprises a second sewage tank 29 for storing filtrate, a sewage pre-reactor 31 connected with the second sewage tank 29, a first supercritical water reactor 32 connected with the sewage pre-reactor 31, a second supercritical water reactor 33 connected with the fourth filter 22 and the sludge dryer 26 for collecting and treating sewage, a cooler 34, a back pressure valve 35, a gas-water separator 36, a water tank 38, and a pressure-resistant air tank 39; heating units are respectively arranged in the first supercritical water reactor 32 and the second supercritical water reactor 33; wherein, the waste heat of the product of the first supercritical water reactor 32 provides reaction energy for the sewage pre-reactor 31, the hydrothermal reactor 21 and the sludge dryer 26 in sequence.
A first gate valve 4, a second gate valve 5 and a third gate valve 6 are respectively connected between the first centrifugal pump 3 and the first filter 7, the second filter 9 and the third filter 11; a first lifter 13 and a first conveyer 16, a second lifter 14 and a second conveyer 17, and a third lifter 15 and a third conveyer 18 for conveying the filtered sludge into the sludge collection bin 19 are respectively arranged between the first filter 7, the second filter 9, the third filter 11 and the sludge collection bin 19; a fourth lifter 24 and a fourth conveyor 25 are arranged between the fourth filter 22 and the sludge dryer 26; a third centrifugal pump 37 is arranged between the gas-water separator 36 and the water tank 38;
the first filter 7, the second filter 9, the third filter 11 and the fourth filter 22 are respectively provided with a first filter screen 8, a second filter screen 10, a third filter screen 12 and a fourth filter screen 23; the pore diameters of the first filter screen 8, the second filter screen 10 and the third filter screen 12 are 30-50 mu m;
a screw conveyor 20 for conveying the sludge to avoid solidification of the sludge under the condition of long time is arranged between the sludge collection bin 19 and the hydrothermal reactor 21; a scraper conveyor 27 is arranged between the sludge dryer 26 and the sludge semicoke collecting bin 28;
a second centrifugal pump 30 for conveying sewage into the sewage pre-reactor 31 is arranged between the second sewage tank 29 and the sewage pre-reactor 31;
a stirrer 2 is arranged in the first sewage tank 1.
The following examples were all treated with the above-described domestic sewage treatment apparatus.
Example 1
The sewage treatment method adopting the domestic sewage treatment device of the embodiment comprises the following specific operation steps:
processing 100m 3 Domestic sewage/h (COD) Cr 500mg/L, 95wt.% water content), the domestic sewage is sent to a subsequent pipeline by a first centrifugal pump 3, the domestic sewage is filtered by a first filter 7, a second filter 9 and a third filter 11, the liquid-phase sewage is sent to a second sewage tank 29, and the solid-phase sludge (the sludge water content is 75%) is sent to a sludge collection bin 19. The operating parameters of the sludge in the hydrothermal reactor 21 are: the temperature is 200 ℃, the pressure is 1.5MPa, the reaction time is 15min, and the product of the hydrothermal reactor 21 enters a sludge dryer 26 for drying, wherein the drying parameters are as follows: drying temperature is 115 ℃ and drying time is 1h. The working parameters of the sewage in the sewage pre-reactor 31 are as follows: the temperature is 280 ℃, the pressure is 22.5MPa, the reaction time is 5s, the product after the sewage pre-reactor 31 is sent into the first supercritical water reactor 32, and the working parameters in the first supercritical water reactor 32 are as follows: the temperature is 500 ℃, the pressure is 22.5MPa, the reaction time is 10s, the filtrate in the fourth filter 22 and the liquid after heat exchange and temperature reduction through the sewage pre-reactor 31, the hydrothermal reactor 21 and the sludge dryer 26 are sent into the second supercritical water reactor 33 together, and the working parameters in the second supercritical water reactor 33 are as follows: the temperature is 550 ℃, the pressure is 22.5MPa, and the reaction time is 15s.
Through the domestic sewage treatment device, the sludge carbocoal yield is 3500kg/h, and the gas yield is 350m 3 /h, COD of liquid product Cr Is 30mg/L, which accords with ChinaStandard value (GB 18918-2016).
Example 2
The sewage treatment method adopting the domestic sewage treatment device of the embodiment comprises the following specific operation steps:
treatment 150m 3 Domestic sewage/h (COD) Cr 200mg/L, 98wt.% water content), the domestic sewage is sent to a subsequent pipeline by a first centrifugal pump 3, the domestic sewage is filtered by a first filter 7, a second filter 9 and a third filter 11, the liquid-phase sewage is sent to a second sewage tank 29, and the solid-phase sludge (the sludge water content is 78%) is sent to a sludge collection bin 19. The operating parameters of the sludge in the hydrothermal reactor 21 are: the temperature is 220 ℃, the pressure is 2.3MPa, the reaction time is 15min, and the product of the hydrothermal reactor 21 enters a sludge dryer 26 for drying, wherein the drying parameters are as follows: drying temperature is 120 ℃ and drying time is 1h. The working parameters of the sewage in the sewage pre-reactor 31 are as follows: the temperature is 280 ℃, the pressure is 23MPa, the reaction time is 5s, the product after the sewage pre-reactor 31 is sent into the first supercritical water reactor 32, and the working parameters in the first supercritical water reactor 32 are as follows: the temperature is 500 ℃, the pressure is 23MPa, the reaction time is 10s, the filtrate in the fourth filter 22 and the liquid after heat exchange and temperature reduction by the sludge dryer 26 are sent into the second supercritical water reactor 33 together, and the working parameters in the second supercritical water reactor 33 are as follows: the temperature is 550 ℃, the pressure is 23MPa, and the reaction time is 15s.
Through the domestic sewage treatment device, the sludge carbocoal yield is 1200kg/h, and the gas yield is 510m 3 /h, COD of liquid product Cr Is 20mg/L, and meets the national standard limit (GB 18918-2016).
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A method for treating sewage by a domestic sewage treatment device, which is characterized by comprising the following steps:
s1, separating a sewage liquid phase and a solid phase: the first filter (7), the second filter (9) and the third filter (11) are used for parallel operation to separate sewage, the separated liquid-phase sewage is conveyed to the second sewage tank (29), and the separated solid-phase sludge is conveyed to the sludge collection bin (19);
s2, preparing sludge semicoke, namely conveying sludge in a sludge collection bin (19) to a hydrothermal reactor (21) through a screw conveyor (20) to react to obtain a sludge semicoke wet sample, and primarily filtering the sludge semicoke wet sample through a fourth filter (22), and conveying the sludge semicoke wet sample to a sludge dryer (26) through a fourth elevator (24) and a fourth conveyor (25) to obtain dried sludge semicoke;
s3, carrying out supercritical water gasification reaction on sewage: the sewage in the second sewage tank (29) is sent to a sewage pre-reactor (31) for preliminary reaction, and then sent to a first supercritical water reactor (32) for reaction; the liquid obtained by filtering the sludge through a fourth filter (22) after the hydrothermal reaction and the product of the first supercritical water reactor (32) are respectively sent to a second supercritical water reactor (33) for reaction after waste heat recovery and utilization, and the product is stored in the pressure-resistant gas storage tank (39) and a water tank (38) after being cooled by a cooler (34) and processed by a gas-liquid separator;
s4, waste heat recovery and utilization: the waste heat of the first supercritical water reactor (32) product sequentially provides reaction energy for the sewage pre-reactor (31), the hydrothermal reactor (21) and the sludge dryer (26);
the domestic sewage treatment device comprises a first sewage tank (1), a first centrifugal pump (3), a three-stage filter connected with the first centrifugal pump (3), a sewage treatment system and a sludge treatment system which are connected with the three-stage filter; the three-stage filter comprises a first filter (7), a second filter (9) and a third filter (11) which are arranged in parallel; the sludge treatment system comprises a sludge collection bin (19), a hydrothermal reactor (21), a fourth filter (22), a sludge dryer (26) and a sludge semicoke collection bin (28) which are sequentially connected, wherein the hydrothermal reactor (21) is simultaneously connected with the sludge dryer (26); the sewage treatment system comprises a second sewage tank (29) for storing filtrate, a sewage pre-reactor (31) connected with the second sewage tank (29), a first supercritical water reactor (32) connected with the sewage pre-reactor (31), a second supercritical water reactor (33) connected with the fourth filter (22) and the sludge dryer (26) for collecting and treating sewage, a cooler (34), a back pressure valve (35), a gas-water separator (36), a water tank (38) and a pressure-resistant air storage tank (39); heating units are respectively arranged in the first supercritical water reactor (32) and the second supercritical water reactor (33); the waste heat of the product of the first supercritical water reactor (32) provides reaction energy for the sewage pre-reactor (31), the hydrothermal reactor (21) and the sludge dryer (26) in sequence.
2. The method for treating sewage by the domestic sewage treatment device according to claim 1, wherein a first gate valve (4), a second gate valve (5) and a third gate valve (6) are respectively connected between the first centrifugal pump (3) and the first filter (7), the second filter (9) and the third filter (11); a first lifting machine (13) and a first conveyor (16), a second lifting machine (14) and a second conveyor (17), and a third lifting machine (15) and a third conveyor (18) which are used for conveying the filtered sludge into the sludge collection bin (19) are respectively arranged among the first filter (7), the second filter (9), the third filter (11) and the sludge collection bin (19); a fourth lifting machine (24) and a fourth conveyor (25) are arranged between the fourth filter (22) and the sludge dryer (26).
3. The method for treating sewage by the domestic sewage treatment device according to claim 1, wherein the first filter (7), the second filter (9), the third filter (11) and the fourth filter (22) are respectively provided with a first filter screen (8), a second filter screen (10), a third filter screen (12) and a fourth filter screen (23); the apertures of the first filter screen (8), the second filter screen (10) and the third filter screen (12) are 30-50 mu m.
4. A method of treating sewage by a domestic sewage treatment device according to claim 1, characterized in that a screw conveyor (20) for conveying sludge to avoid solidification of sludge in long time is provided between the sludge collection bin (19) and the hydrothermal reactor (21); a scraper conveyor (27) is arranged between the sludge dryer (26) and the sludge semicoke collecting bin (28).
5. A method of treating sewage in a domestic sewage treatment plant according to claim 1, wherein a second centrifugal pump (30) for feeding sewage into the sewage pre-reactor (31) is arranged between the second sewage tank (29) and the sewage pre-reactor (31).
6. A method for treating sewage by a domestic sewage treatment apparatus according to claim 1, wherein the first sewage tank (1) is provided with a stirrer (2).
7. The method for treating sewage by a domestic sewage treatment apparatus according to claim 1, wherein in the step (1), the maximum total load capacity of the first filter (7), the second filter (9) and the third filter (11) for treating domestic sewage is 250m 3 /h。
8. A method for treating sewage by a domestic sewage treatment apparatus according to claim 1, wherein in step (2), the working conditions of the hydrothermal reactor (21) are: the water content of the sludge raw material is 65-80%, the temperature is 170-240 ℃, the pressure is 0.8-3.3 MPa, and the reaction time is 10-15 min; the sludge dryer (26) has the following working conditions: the drying temperature is 110-120 ℃ and the drying time is 0.8-1 h.
9. A method for treating sewage by a domestic sewage treatment apparatus according to claim 1, wherein in the step (3), the operation condition of the sewage pre-reactor (31) is: the temperature is 200-300 ℃, the pressure is 22.5-23.5 MPa, and the reaction time is 2-5 s; the working conditions of the first supercritical water reactor (32) are as follows: the temperature is 500-550 ℃, the pressure is 22.5-23.5 MPa, and the reaction time is 5-10 s; the working conditions of the second supercritical water reactor (33) are as follows: the temperature is 500-550 ℃, the pressure is 22.5-23.5 MPa, and the reaction time is 10-15 s; the pressure-resistant air storage tank (39) has the following parameters: single unit volume 10.0m 3 The highest withstanding pressure is 2.5MPa; the volume of the water tank (38) is 800-1000 m 3 。
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| JPH09276900A (en) * | 1996-04-17 | 1997-10-28 | Japan Organo Co Ltd | Supercritical water oxidizing method of organic sludge and organic sludge supply apparatus used therein |
| KR100894154B1 (en) * | 2008-09-26 | 2009-04-22 | 고등기술연구원연구조합 | Apparatus and methods of a successive treatment of organic sludges for producing solid-liquid slurry containing solids and secessional liquids from organic sludge |
| CN203999298U (en) * | 2014-06-18 | 2014-12-10 | 上海富诚环保科技有限公司 | Sludge treatment equipment |
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| CN208700614U (en) * | 2018-07-26 | 2019-04-05 | 南京林业大学 | A kind of sewage treatment unit |
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| JPH09276900A (en) * | 1996-04-17 | 1997-10-28 | Japan Organo Co Ltd | Supercritical water oxidizing method of organic sludge and organic sludge supply apparatus used therein |
| KR100894154B1 (en) * | 2008-09-26 | 2009-04-22 | 고등기술연구원연구조합 | Apparatus and methods of a successive treatment of organic sludges for producing solid-liquid slurry containing solids and secessional liquids from organic sludge |
| CN203999298U (en) * | 2014-06-18 | 2014-12-10 | 上海富诚环保科技有限公司 | Sludge treatment equipment |
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