CN115367870A - UASB coupling air-flotation anaerobic sewage treatment system and method - Google Patents
UASB coupling air-flotation anaerobic sewage treatment system and method Download PDFInfo
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- 239000010865 sewage Substances 0.000 title claims abstract description 52
- 238000005188 flotation Methods 0.000 title claims abstract description 39
- 230000008878 coupling Effects 0.000 title claims abstract description 24
- 238000010168 coupling process Methods 0.000 title claims abstract description 24
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000009280 upflow anaerobic sludge blanket technology Methods 0.000 title claims abstract 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 181
- 239000010802 sludge Substances 0.000 claims abstract description 46
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- 239000002253 acid Substances 0.000 claims description 9
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- 230000009471 action Effects 0.000 claims description 8
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- 239000003344 environmental pollutant Substances 0.000 claims description 8
- 231100000719 pollutant Toxicity 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 7
- 239000002101 nanobubble Substances 0.000 claims description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- 239000003814 drug Substances 0.000 claims description 6
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- 238000009300 dissolved air flotation Methods 0.000 claims description 4
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- 235000019799 monosodium phosphate Nutrition 0.000 claims description 3
- PJNZPQUBCPKICU-UHFFFAOYSA-N phosphoric acid;potassium Chemical compound [K].OP(O)(O)=O PJNZPQUBCPKICU-UHFFFAOYSA-N 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- AJPJDKMHJJGVTQ-UHFFFAOYSA-M sodium dihydrogen phosphate Chemical group [Na+].OP(O)([O-])=O AJPJDKMHJJGVTQ-UHFFFAOYSA-M 0.000 claims description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N urea group Chemical group NC(=O)N XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 3
- 229910019142 PO4 Inorganic materials 0.000 claims description 2
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/2846—Anaerobic digestion processes using upflow anaerobic sludge blanket [UASB] reactors
-
- 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
- C02F3/28—Anaerobic digestion processes
- C02F3/2866—Particular arrangements for anaerobic reactors
-
- 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
- C02F3/28—Anaerobic digestion processes
- C02F3/2866—Particular arrangements for anaerobic reactors
- C02F3/2873—Particular arrangements for anaerobic reactors with internal draft tube circulation
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
Abstract
The invention provides a UASB coupling air-flotation anaerobic sewage treatment system and a method thereof, wherein the system comprises an adjusting tank, an anaerobic water inlet tank, a UASB anaerobic reactor, a biogas burner, an air-flotation separator and a gas-water dissolving device; the air floatation separator includes: the device comprises a pressure reduction releaser, a contact zone, a separation zone, a mud settling zone, a clear water zone, a slag scraper and a mud floating groove; the decompression releaser is positioned in the contact area of the air floatation separator. The invention thoroughly solves the problems that the high-efficiency stable operation of the whole sewage treatment system is influenced by the sludge carried by the effluent of the UASB anaerobic reactor and the treatment efficiency of the UASB anaerobic reactor is not high through the optimized combination and complementary advantages of the UASB anaerobic reactor and the air floatation separator, and greatly popularizes the engineering application of the UASB anaerobic reactor.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a UASB (upflow anaerobic sludge blanket) coupling air flotation anaerobic sewage treatment system and method.
Background
The domestic environmental problems are increasingly prominent, so that the domestic environmental protection policy is increasingly strict, and the treatment of medium-concentration and high-concentration degradation-resistant organic wastewater faces more and more challenges. Anaerobic biological treatment of wastewater is a process of converting various complex organic matter molecules in wastewater into micromolecular acid or methane and carbon dioxide by using the biodegradation of anaerobic microorganisms or facultative microorganisms under the anaerobic condition, thereby degrading pollutants in the wastewater or improving the biodegradability of the wastewater. Compared with aerobic biological treatment, the anaerobic biological treatment has the advantages of low energy consumption, high load, less nitrogen and phosphorus nutrition requirement and the like, and is widely applied to biological treatment of medium and high concentration refractory organic wastewater.
UASB (upflow anaerobic sludge blanket reactor) is the most commonly used anaerobic biological treatment process, and a sludge blanket with high concentration and high activity is arranged at the bottom of the reactor, and most organic pollutants in sewage are degraded into methane and carbon dioxide through anaerobic fermentation. The upper part of the reactor is provided with a three-phase separator for separating the digestion gas (methane), the digestion liquid and the sludge. The digestion gas (methane) is led out from the top of the reactor; the sludge automatically slides down and settles to a sludge bed at the bottom of the reactor; the digestive juice is discharged from the clarification zone. The UASB load is large, is suitable for the treatment of medium and high concentration organic wastewater, has high organic pollutant removal rate, does not need stirring, and can adapt to the advantages of better load impact, temperature and pH change and the like.
The UASB is used for anaerobic biological treatment of medium-concentration and high-concentration refractory organic wastewater, and the biggest problem of the UASB is that the effluent of the UASB carries anaerobic sludge, which seriously affects the efficient and stable operation of a subsequent anoxic/aerobic biological treatment system on one hand, and causes a great amount of anaerobic sludge loss to affect the efficient operation of the UASB on the other hand. At present, the most common method for solving the problem of sludge leakage of UASB effluent is to connect a sedimentation tank behind a UASB anaerobic reactor, precipitate, separate and reflux anaerobic sludge carried by the UASB effluent. However, because the settleability of anaerobic sludge carried by effluent of the UASB is poor, the separation performance of the sedimentation tank on the anaerobic sludge is poor, the effluent still influences the stable operation of a subsequent anoxic/aerobic biological treatment system, and the sedimentation load of the sedimentation tank is small.
In conclusion, although the UASB anaerobic reactor is widely applied to anaerobic biological treatment of medium-concentration and high-concentration refractory organic wastewater, the problem of sludge leakage of effluent seriously affects the efficient and stable operation of the whole water treatment system, and the popularization and the application of the UASB anaerobic reactor are limited. At present, the common sedimentation tank is adopted to separate and return sludge carried by UASB effluent, the effect is general and the engineering investment is high.
Disclosure of Invention
In order to solve the problems, the invention provides a UASB coupling air-flotation anaerobic sewage treatment system and a UASB coupling air-flotation anaerobic sewage treatment method, which completely solve the problems that the sludge carried by the effluent of the UASB anaerobic reactor affects the efficient and stable operation of the whole sewage treatment system and the treatment efficiency of the UASB anaerobic reactor is not high through the optimized combination of the UASB anaerobic reactor and the air-flotation separator and complement the advantages, and greatly popularize the engineering application of the UASB anaerobic reactor.
In order to achieve the purpose, the invention provides a UASB coupling air-float anaerobic sewage treatment system, which comprises:
the system comprises a regulating tank, an anaerobic water inlet tank, a UASB anaerobic reactor, a biogas burner, an air floatation separator and a gas water dissolving device;
the air floatation separator includes: the device comprises a decompression releaser, a contact zone, a separation zone, a mud settling zone, a clear water zone, a slag scraper and a mud floating groove; the decompression releaser is positioned in the contact area of the air floatation separator;
the regulating tank is connected with the anaerobic water inlet tank through a water outlet pipe of the regulating tank; the anaerobic water inlet tank is connected with an anaerobic water inlet pump through an anaerobic water inlet pipe of the anaerobic water inlet pump; the anaerobic water inlet tank is connected with the UASB anaerobic reactor through an anaerobic water outlet circulating pipe; the anaerobic water inlet tank is connected with the mud settling area and the mud floating groove of the air floatation separator through an anaerobic sludge return pipe; the anaerobic water inlet pump is connected with the UASB anaerobic reactor through an anaerobic water inlet pump water outlet pipe; the UASB anaerobic reactor is connected with the air floatation separator through an anaerobic water outlet pipe; the UASB anaerobic reactor is connected with the biogas burner through a biogas collecting pipe; the gas dissolving water device is connected with the clear water area of the air floatation separator through a gas dissolving water inlet pipe; the dissolved air water device is connected with the decompression releaser of the air flotation separator through a dissolved air water pipe.
Preferably, a regulating tank solid-liquid homogenizing mixer is arranged in the regulating tank and used for homogenizing and homogenizing the inlet water.
Preferably, an anaerobic water inlet pool solid-liquid homogeneous mixer is arranged in the anaerobic water inlet pool, so that the effluent of the regulating pool is fully mixed with anaerobic effluent circulating water, backflow anaerobic sludge and an external medicament.
Preferably, one or more of phosphorus salt, nitrogen source, alkali liquor and acid are added into the anaerobic water inlet tank according to the effluent quality of the regulating tank.
Preferably, the phosphorus salt is sodium dihydrogen phosphate or potassium dihydrogen phosphate; the nitrogen source is urea; the alkali liquor is sodium hydroxide or sodium carbonate; the acid is sulfuric acid or hydrochloric acid.
Preferably, the circulation flow of the anaerobic effluent circulation pipe enables the ascending flow velocity of the UASB anaerobic reactor to be less than 0.8m/h.
Preferably, the air flotation separator is one of a pressurized dissolved air flotation separator, a jet flow air flotation separator and a shallow air flotation separator.
Preferably, the gas dissolving water device comprises a gas dissolving water pump, a gas dissolving water tank and a gas source;
the dissolved air water pump is connected with the clear water area of the air floatation separator through a dissolved air water inlet pipe; the dissolved air water pump is connected to the upper end of the dissolved air water tank through a dissolved air water pump outlet pipe; the gas source is connected to the upper end of the gas dissolving water tank through a gas inlet pipe; the lower end of the dissolved air water tank is connected with a decompression releaser of the air floatation separator through a dissolved air water pipe.
Preferably, the air source is an air compressor or a compressed air storage tank.
The invention also provides a UASB coupling air-flotation anaerobic sewage treatment method, which comprises the following steps:
fully stirring the inlet water by using a solid-liquid homogenizing mixer of the regulating tank to obtain homogenized and uniform outlet water of the regulating tank;
fully mixing the homogenized and uniform amount of effluent of the regulating reservoir with anaerobic effluent circulating water, backflow anaerobic sludge and an external medicament by using a solid-liquid homogenizing mixer of the anaerobic water inlet pool to obtain pre-acidified effluent of the anaerobic water inlet pool with low pollutant concentration;
pollutants in the effluent of the low-pollutant-concentration pre-acidified anaerobic intake pool are converted into biogas under the action of anaerobic microorganisms, and the biogas is combusted and decomposed to obtain effluent of a UASB anaerobic reactor; wherein, part of effluent of the UASB anaerobic reactor is returned to the anaerobic water inlet tank, and the rest effluent of the UASB anaerobic reactor is subjected to micro-nano bubble separation to obtain separated anaerobic sludge and separated sewage; the separated anaerobic sludge is precipitated and collected and then flows back to the anaerobic water inlet tank;
obtaining separated sewage and air, and fully contacting the separated sewage with the air to generate gas-dissolved water;
under the action of the micro-nano bubbles, the dissolved air water and the effluent of the UASB anaerobic reactor are subjected to contact reaction to complete the treatment of sewage.
Compared with the prior art, the invention has the following advantages and technical effects:
(1) The UASB coupling air-flotation anaerobic treatment sewage system and the method thereof thoroughly solve the problems that the efficient and stable operation of the whole sewage treatment system is influenced by the sludge leakage of the effluent of the UASB anaerobic reactor and the treatment efficiency of the UASB anaerobic reactor is not high, and greatly popularize the engineering application of the UASB anaerobic reactor;
(2) Compared with a common UASB anaerobic reactor and a sedimentation tank connected behind the UASB anaerobic reactor for anaerobic sludge separation and backflow, the UASB coupling air flotation anaerobic sewage treatment system and method provided by the invention have the advantages of high anaerobic sludge separation and backflow efficiency, stable operation, low effluent suspended matter and the like;
(3) According to the UASB coupling air-flotation anaerobic sewage treatment system and method, anaerobic sludge is refluxed into the anaerobic water inlet tank through the air-flotation separator, so that pre-acidification of inlet water of the UASB anaerobic reactor can be realized, the biodegradability of sewage is improved, the inlet water quality of the UASB anaerobic reactor is improved, and the treatment efficiency of the UASB anaerobic reactor is improved;
(4) According to the UASB coupling air-flotation anaerobic sewage treatment system and method provided by the invention, partial effluent of the UASB anaerobic reactor circularly flows back to the anaerobic water inlet tank, so that the concentration of influent pollutants of the UASB anaerobic reactor can be reduced, and the UASB anaerobic reactor is particularly suitable for anaerobic biological treatment of high-concentration refractory organic sewage;
(5) According to the UASB coupling air-flotation anaerobic sewage treatment system and method provided by the invention, phosphate, nitrogen source, acid, alkali, trace elements and the like are added into the anaerobic water inlet tank according to the quality of sewage, so that the quality of sewage is improved, the treatment efficiency of the UASB anaerobic reactor is improved, and the efficient and stable operation of the UASB anaerobic reactor is ensured;
(6) Compared with an IC (integrated circuit) anaerobic reactor and an EGSB anaerobic reactor, the UASB coupling air flotation anaerobic sewage treatment system and method provided by the invention have the advantages of simple structure, stable and reliable treatment effect, low engineering investment, simple operation management and the like.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
FIG. 1 is a schematic structural view of a UASB coupled air-flotation anaerobic sewage treatment system according to the present invention;
wherein, 1, a water inlet pipe; 2. a regulating tank; 2-1, a regulating tank solid-liquid homogenizing mixer; 3. a water outlet pipe of the regulating tank; 4. an anaerobic water inlet tank; 4-1, a solid-liquid homogenizing mixer of the anaerobic water inlet tank; 4-2, a phosphorus salt dosing pipe; 4-3, a nitrogen source dosing pipe; 4-4, adding an alkali liquor into the medicine tube; 4-5, acid dosing tube; 5. an anaerobic water inlet pump water inlet pipe; 6. an anaerobic feed pump; 7. an anaerobic water inlet pump water outlet pipe; 8. a UASB anaerobic reactor; 9. a biogas collecting pipe; 10. a biogas burner; 11. an anaerobic water outlet pipe; 12. an anaerobic effluent circulation pipe; 13. an air flotation separator; 13-1, a reduced pressure releaser; 13-2, contact zone; 13-3, a separation zone; 13-4, a mud settling area; 13-5, a clear water area; 13-6, slag scraping machine; 13-7, a floating mud groove; 14. a water outlet pipe; 15. an anaerobic sludge return pipe; 16. a water inlet pipe for dissolved air water; 17. a dissolved air water pump; 18. a water outlet pipe of the dissolved air water pump; 19. a dissolved gas water tank; 20. an air inlet pipe; 21. a gas source; 22. a dissolved air water pipe; 23. a water-dissolving device.
Detailed Description
It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer-executable instructions and that, although a logical order is illustrated in the flowcharts, in some cases, the steps illustrated or described may be performed in an order different than here.
Example 1
The invention provides a UASB (upflow anaerobic sludge blanket) coupling air floatation anaerobic sewage treatment system, which comprises an adjusting tank 2, an anaerobic water inlet tank 4, a UASB anaerobic reactor 8, a biogas burner 10, an air floatation separator 13 and a gas water dissolving device 23 as shown in figure 1. The air floatation separator 13 comprises a contact zone 13-2, a separation zone 13-3, a mud settling zone 13-4, a clear water zone 13-5, a slag scraper 13-6, a mud floating groove 13-7 and a decompression releaser 13-1. The decompression releaser 13-1 is positioned in a contact area 13-2 of the floatation separator 13. The adjusting tank 2 is connected with an anaerobic water inlet tank 4 through an adjusting tank water outlet pipe 3; the anaerobic water inlet tank 4 is connected with an anaerobic water inlet pump 6 through an anaerobic water inlet pump water inlet pipe 5; the anaerobic water inlet tank 4 is connected with a UASB anaerobic reactor 8 through an anaerobic water outlet circulating pipe 12; the anaerobic water inlet tank 4 is connected with a mud sedimentation area 13-4 and a mud floating groove 13-7 of the air floatation separator 13 through an anaerobic sludge return pipe 15; the anaerobic water inlet pump 6 is connected with a UASB anaerobic reactor 8 through a water outlet pipe 7 of the anaerobic water inlet pump; the UASB anaerobic reactor 8 is connected with an air floatation separator 13 through an anaerobic water outlet pipe 11; the UASB anaerobic reactor 8 is connected with a biogas burner 10 through a biogas collecting pipe 9; the water-dissolving gas device 23 is connected with the clear water area 13-5 of the air flotation separator 13 through a water inlet pipe 16 for water-dissolving gas. The dissolved air water device 23 is connected with the decompression releaser 13-1 of the air floatation separator 13 through an dissolved air water pipe 22.
Preferably, a regulating tank solid-liquid homogenizing mixer 2-1 is arranged in the regulating tank 2 and is used for homogenizing and homogenizing the inlet water.
Preferably, an anaerobic water inlet pool solid-liquid homogeneous mixer 4-1 is arranged in the anaerobic water inlet pool 4, so that the effluent of the regulating pool 2 is fully mixed with anaerobic effluent circulating water, backflow anaerobic sludge and an external medicament.
Preferably, one or more of phosphorus salt, a nitrogen source, alkali liquor and acid can be added into the anaerobic water inlet tank 4 according to the water quality of the water discharged from the regulating tank 2.
More preferably, the phosphorus salt is sodium dihydrogen phosphate or potassium dihydrogen phosphate.
More preferably, the nitrogen source is urea.
More preferably, the alkali liquor is sodium hydroxide or sodium carbonate.
More preferably, the acid is sulfuric acid or hydrochloric acid.
Preferably, the circulation flow of the anaerobic effluent circulation pipe 12 enables the ascending flow velocity of the UASB anaerobic reactor 8 to be less than 0.8m/h.
Preferably, the air flotation separator 13 is a pressurized dissolved air flotation separator, a jet flow air flotation separator, or a shallow air flotation separator.
More preferably, the air flotation separator 13 is a pressurized dissolved air flotation separator.
Preferably, the gas dissolving water device 23 comprises a gas dissolving water pump 17, a gas dissolving water tank 19 and a gas source 21; the dissolved air water pump 17 is connected with the clear water area 13-5 of the air floatation separator 13 through a dissolved air water inlet pipe 16; the dissolved air water pump 17 is connected to the upper end of a dissolved air water tank 19 through a dissolved air water pump water outlet pipe 18; the gas source 21 is connected to the upper end of the dissolved gas water tank 19 through an air inlet pipe 20; the lower end of the dissolved air water tank 19 is connected with a decompression releaser 13-1 of the air floatation separator 13 through a dissolved air water pipe 22.
Preferably, the air source 21 is an air compressor or a compressed air storage tank.
The system of this example 1 was used to treat a brewery wastewater. The COD of raw water is 8200mg/L, the COD is 1560mg/L after the treatment of the system, the removal rate of the COD is 81 percent, and the suspended matters in the air flotation effluent are 80mg/L. The wastewater is treated by the system to obtain good COD removal effect and thoroughly solve the problem of sludge leakage of the effluent of the UASB anaerobic reactor.
Example 2
According to the UASB coupling air-flotation anaerobic sewage treatment method provided by the invention, by utilizing the UASB coupling air-flotation anaerobic sewage treatment system, sewage enters the adjusting tank 2 through the water inlet pipe 1, and is homogenized and equalized under the full stirring action of the solid-liquid homogenizing mixer 2-1 of the adjusting tank. The effluent of the adjusting tank 2 enters an anaerobic water inlet tank 4 through an outlet pipe 3 of the adjusting tank, and is fully mixed with circulating water refluxed by the UASB anaerobic reactor 8, anaerobic sludge refluxed by the air floatation separator 13 and a medicament added according to the quality of sewage water under the action of a solid-liquid homogeneous mixer 4-1 of the anaerobic water inlet tank so as to reduce the concentration of pollutants in the influent of the UASB anaerobic reactor 8, improve the quality of the influent of the UASB anaerobic reactor 8 and pre-acidify the influent of the UASB anaerobic reactor 8. The effluent of the anaerobic water inlet tank 4 is pressurized and lifted by an anaerobic water inlet pump 6 to enter a UASB anaerobic reactor 8, and flows through the UASB anaerobic reactor 8 from bottom to top, and pollutants in the sewage are converted into methane and purified under the action of anaerobic microorganisms. Biogas generated by the UASB anaerobic reactor 8 is collected by a biogas collecting pipe 9 and then is sent to a biogas combustor 10 for combustion and decomposition. The water outlet part of the UASB anaerobic reactor 8 flows back to the anaerobic water inlet tank 4 through an anaerobic water outlet circulating pipe 12, part of the water outlet part enters a contact area 13-2 of an air floatation separator 13 and is fully contacted with micro-nano bubbles released by a decompression releaser 13-1, then the separation of anaerobic sludge and sewage in the water outlet of the UASB anaerobic reactor 8 is realized through the separation effect of the micro-nano bubbles in a separation area 13-3 of the air floatation separator 13, the separated sewage enters a clear water area 13-5 of the air floatation separator 13, the separated anaerobic sludge is partially precipitated to a sludge sedimentation area 13-4 of the air floatation separator 13, and the separated anaerobic sludge is partially collected to a sludge floating tank 13-7 through a sludge scraper 13-6. Anaerobic sludge in a mud sedimentation area 13-4 and a mud floating groove 13-7 of the air floatation separator 13 flows back to the anaerobic water inlet tank 4 through an anaerobic sludge return pipe 15, so that the anaerobic sludge in the effluent of the UASB anaerobic reactor 8 is thoroughly separated from sewage, and the problem of mud leakage of the effluent of the UASB anaerobic reactor 8 is solved. The dissolved air water pump 17 takes clear water in a clear water area 13-5 of the air floatation separator 13 as a water source, and is in full contact with air generated by an air source 21 in the dissolved air water tank 19, the air is dissolved in the water under the action of high pressure of the dissolved air water tank 19 to form dissolved air water, and then a large number of micro-nano bubbles are generated by the release of the reduced pressure releaser 13-1 and are in contact reaction with the effluent of the UASB anaerobic reactor 8.
According to the UASB coupling air-flotation anaerobic sewage treatment system and method provided by the invention, by the optimized combination of the UASB anaerobic reactor and the air-flotation separator, the advantages are complemented, the problems that the high-efficiency stable operation of the whole sewage treatment system is influenced by mud carried by the effluent of the UASB anaerobic reactor and the treatment efficiency of the UASB anaerobic reactor is not high are thoroughly solved, and the engineering application of the UASB anaerobic reactor is greatly promoted; the problem of low separation efficiency of UASB effluent anaerobic sludge separated by a precipitation method is avoided, the engineering investment is low, and the system treatment efficiency is high. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The above description is only for the preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides a UASB coupling air supporting anaerobic treatment sewage system which characterized in that includes:
the system comprises a regulating tank, an anaerobic water inlet tank, a UASB anaerobic reactor, a biogas burner, an air floatation separator and a gas water dissolving device;
the air flotation separator comprises: the device comprises a pressure reduction releaser, a contact zone, a separation zone, a mud settling zone, a clear water zone, a slag scraper and a mud floating groove; the decompression releaser is positioned in the contact area of the floatation separator;
the regulating tank is connected with the anaerobic water inlet tank through a water outlet pipe of the regulating tank; the anaerobic water inlet tank is connected with an anaerobic water inlet pump through an anaerobic water inlet pipe of the anaerobic water inlet pump; the anaerobic water inlet tank is connected with the UASB anaerobic reactor through an anaerobic water outlet circulating pipe; the anaerobic water inlet tank is connected with the mud settling area and the mud floating groove of the air floatation separator through an anaerobic sludge return pipe; the anaerobic water inlet pump is connected with the UASB anaerobic reactor through a water outlet pipe of the anaerobic water inlet pump; the UASB anaerobic reactor is connected with the air floatation separator through an anaerobic water outlet pipe; the UASB anaerobic reactor is connected with the biogas burner through a biogas collecting pipe; the gas dissolving water device is connected with the clear water area of the air floatation separator through a gas dissolving water inlet pipe; the dissolved air water device is connected with the decompression releaser of the air flotation separator through a dissolved air water pipe.
2. The UASB coupling air-float anaerobic sewage treatment system as claimed in claim 1, wherein a solid-liquid homogenizing mixer is installed in the adjusting tank for homogenizing and homogenizing the inlet water.
3. The UASB coupling air-float anaerobic sewage treatment system of claim 1, wherein an anaerobic intake pool solid-liquid homogeneous mixer is installed in the anaerobic intake pool to make the effluent of the adjusting pool fully mixed with the anaerobic effluent circulating water, the reflux anaerobic sludge and the external agent.
4. The UASB coupling air-float anaerobic sewage treatment system according to claim 3, wherein the anaerobic intake pool is fed with one or more of phosphorus salt, nitrogen source, alkali liquor and acid according to the effluent quality of the adjusting pool.
5. The UASB coupling air-float anaerobic sewage treatment system of claim 4, wherein the phosphate is sodium dihydrogen phosphate or potassium dihydrogen phosphate; the nitrogen source is urea; the alkali liquor is sodium hydroxide or sodium carbonate; the acid is sulfuric acid or hydrochloric acid.
6. The UASB coupled air-floating anaerobic sewage treatment system according to claim 1, wherein the circulation flow of the anaerobic effluent circulation pipe enables the ascending flow velocity of the UASB anaerobic reactor to be less than 0.8m/h.
7. The UASB-coupled air-flotation anaerobic wastewater treatment system according to claim 1, wherein the air-flotation separator is one of a pressurized dissolved air-flotation separator, a jet flow air-flotation separator and a shallow air-flotation separator.
8. The UASB-coupled air-floating anaerobic sewage treatment system according to claim 1, wherein the air-dissolving water device comprises an air-dissolving water pump, an air-dissolving water tank and an air source;
the dissolved air water pump is connected with the clear water area of the air floatation separator through a dissolved air water inlet pipe; the dissolved air water pump is connected to the upper end of the dissolved air water tank through a dissolved air water pump outlet pipe; the gas source is connected to the upper end of the gas dissolving water tank through a gas inlet pipe; the lower end of the dissolved air water tank is connected with a decompression releaser of the air floatation separator through a dissolved air water pipe.
9. The UASB-coupled air-flotation anaerobic sewage treatment system according to claim 8, wherein the air source is an air compressor or a compressed air storage tank.
10. A UASB coupling air-float anaerobic sewage treatment method is characterized by comprising the following steps:
fully stirring the inlet water by using a solid-liquid homogenizing mixer of the regulating tank to obtain homogenized and uniform outlet water of the regulating tank;
fully mixing the homogenized and uniform amount of effluent of the regulating reservoir with anaerobic effluent circulating water, backflow anaerobic sludge and an external medicament by using a solid-liquid homogenizing mixer of the anaerobic water inlet pool to obtain pre-acidified effluent of the anaerobic water inlet pool with low pollutant concentration;
pollutants in effluent of the low-pollutant-concentration pre-acidified anaerobic intake pool are converted into biogas under the action of anaerobic microorganisms, and the biogas is combusted and decomposed to obtain effluent of the UASB anaerobic reactor; wherein, the preset effluent part of the UASB anaerobic reactor flows back to the anaerobic water inlet tank, and the rest effluent of the UASB anaerobic reactor obtains separated anaerobic sludge and separated sewage under the micro-nano bubble separation effect; the separated anaerobic sludge is precipitated and collected and then flows back to the anaerobic water inlet tank;
obtaining separated sewage and air, and fully contacting the separated sewage and the air to generate gas-dissolved water;
under the action of the micro-nano bubbles, the dissolved air water and the effluent of the UASB anaerobic reactor are subjected to contact reaction to complete the treatment of sewage.
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| US20060131231A1 (en) * | 2004-12-20 | 2006-06-22 | Industrial Technology Research Institute | Anaerobic biological wastewater treatment system and process |
| CN102616930A (en) * | 2012-04-19 | 2012-08-01 | 徐富 | Methane air floating anaerobic reactor |
| CN105174617A (en) * | 2015-09-11 | 2015-12-23 | 武汉市宜能环保科技有限公司 | Wastewater advanced treatment system of large-scale pig farm |
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|---|---|---|---|---|
| US20060131231A1 (en) * | 2004-12-20 | 2006-06-22 | Industrial Technology Research Institute | Anaerobic biological wastewater treatment system and process |
| CN102616930A (en) * | 2012-04-19 | 2012-08-01 | 徐富 | Methane air floating anaerobic reactor |
| CN105174617A (en) * | 2015-09-11 | 2015-12-23 | 武汉市宜能环保科技有限公司 | Wastewater advanced treatment system of large-scale pig farm |
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