CN116062889A - Device and method for strengthening urban sewage nitrogen and phosphorus co-efficient removal and carbon capture by high-load activated sludge process - Google Patents
Device and method for strengthening urban sewage nitrogen and phosphorus co-efficient removal and carbon capture by high-load activated sludge process Download PDFInfo
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- CN116062889A CN116062889A CN202310000315.5A CN202310000315A CN116062889A CN 116062889 A CN116062889 A CN 116062889A CN 202310000315 A CN202310000315 A CN 202310000315A CN 116062889 A CN116062889 A CN 116062889A
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- 239000010802 sludge Substances 0.000 title claims abstract description 181
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 39
- 239000010865 sewage Substances 0.000 title claims abstract description 39
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 35
- 239000011574 phosphorus Substances 0.000 title claims abstract description 35
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 31
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 30
- 230000008569 process Effects 0.000 title claims abstract description 22
- 238000005728 strengthening Methods 0.000 title claims abstract description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 200
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 100
- 230000003647 oxidation Effects 0.000 claims abstract description 100
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 100
- 230000008878 coupling Effects 0.000 claims abstract description 82
- 238000010168 coupling process Methods 0.000 claims abstract description 82
- 238000005859 coupling reaction Methods 0.000 claims abstract description 82
- 238000000855 fermentation Methods 0.000 claims abstract description 45
- 230000004151 fermentation Effects 0.000 claims abstract description 39
- 238000005273 aeration Methods 0.000 claims abstract description 17
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 101
- 230000002572 peristaltic effect Effects 0.000 claims description 40
- 238000003756 stirring Methods 0.000 claims description 22
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims description 16
- 239000006228 supernatant Substances 0.000 claims description 15
- 238000009825 accumulation Methods 0.000 claims description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 9
- 229910052760 oxygen Inorganic materials 0.000 claims description 9
- 239000001301 oxygen Substances 0.000 claims description 9
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 8
- 230000014759 maintenance of location Effects 0.000 claims description 7
- 239000002351 wastewater Substances 0.000 claims description 7
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 claims description 6
- 230000001376 precipitating effect Effects 0.000 claims description 5
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 claims description 4
- 238000010992 reflux Methods 0.000 claims description 4
- 238000011081 inoculation Methods 0.000 claims description 3
- 229910002651 NO3 Inorganic materials 0.000 abstract description 8
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 abstract description 8
- 230000001360 synchronised effect Effects 0.000 abstract description 7
- 238000004064 recycling Methods 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 239000005431 greenhouse gas Substances 0.000 abstract 1
- 229920002521 macromolecule Polymers 0.000 abstract 1
- 230000001276 controlling effect Effects 0.000 description 9
- 241000894006 Bacteria Species 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 7
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- 238000004065 wastewater treatment Methods 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 2
- 102100029974 GTPase HRas Human genes 0.000 description 1
- 101000584633 Homo sapiens GTPase HRas Proteins 0.000 description 1
- 241001453382 Nitrosomonadales Species 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
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- 230000001546 nitrifying effect Effects 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
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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
- C02F3/30—Aerobic and anaerobic processes
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- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
A device and a method for strengthening urban sewage nitrogen and phosphorus co-efficient removal and carbon capture by a high-load activated sludge process belong to the field of sewage biological treatment. Urban sewage firstly enters an anaerobic/aerobic high-load activated sludge system, phosphorus in the sewage is removed while organic matters are adsorbed, effluent enters a short-cut denitrification coupling anaerobic ammonia oxidation system to remove partial ammonia nitrogen and residual organic matters, the short-cut nitrification coupling anaerobic ammonia oxidation system is utilized to remove residual ammonia nitrogen, and generated nitrate flows back to the short-cut denitrification coupling anaerobic ammonia oxidation system to be removed; the anaerobic/aerobic alternate mode is adopted to operate, the sludge absorbing the organic matters is discharged to a sludge storage pond, and macromolecule organic matters are hydrolyzed to generate a micromolecular carbon source through anaerobic sludge fermentation, so that an electron donor is provided for the short-cut denitrification coupling anaerobic ammonia oxidation system. The invention not only realizes synchronous deep removal of nitrogen and phosphorus, saves aeration energy consumption, does not need additional carbon source, reduces greenhouse gas emission, but also realizes recycling of sewage carbon source and sludge reduction.
Description
Technical field:
the invention relates to a high-load activated sludge process reinforced urban sewage nitrogen and phosphorus co-efficient removal and carbon capture device and method, and belongs to the technical field of sewage treatment. The method specifically comprises the steps of removing phosphorus while adsorbing and recovering organic matters in water by a High-load activated sludge process (High-rate activated sludge, HRAS); removing part of ammonia nitrogen and residual organic matters by utilizing a short-cut denitrification coupling anaerobic ammonia oxidation system; and then removing residual ammonia nitrogen by using a short-cut nitrification-coupled anaerobic ammonia oxidation system, and refluxing the effluent to the short-cut denitrification-coupled anaerobic ammonia oxidation system to remove excessive nitrate, so that the synchronous removal of nitrogen and phosphorus in urban sewage is realized and the recycling of sewage resource energy is promoted.
The background technology is as follows:
in recent years, urban sewage is increasingly increased along with urban development and improvement of living standards of residents, and components in the sewage are increasingly complex. The pollution of nitrogen and phosphorus is more serious along with the increase of the discharge amount, and the caused eutrophication of water is frequent, so that the living environment of people is influenced, and the health of people is endangered. Therefore, efficient removal of nitrogen and phosphorus has become an important goal for wastewater treatment.
However, the conventional denitrification process often requires a large amount of aeration and additional addition of an organic carbon source to maintain a certain alkalinity, which results in higher operation cost and investment, and thus is increasingly limited in the application of the actual nitrification-denitrification technology for sewage treatment. Anaerobic ammonia oxidizing bacteria directly convert ammonia nitrogen into nitrogen under anoxic or anaerobic conditions by taking nitrite as an electron acceptor. The anaerobic ammonia oxidation technology does not need additional carbon source and aeration, thereby greatly reducing energy consumption and operation cost, reducing sludge generation and playing an important role in water environment treatment. Meanwhile, the development of the anaerobic ammonia oxidation technology provides a new development direction for traditional denitrification. However, at the beginning of the development of anaerobic ammonia oxidation, the challenge is the problem of nitrite nitrogen supply. In mainstream municipal wastewater treatment systems, stable short-cut nitrification is difficult to achieve, resulting in accumulation of higher concentrations of nitrate nitrogen in the effluent of the anaerobic ammonia oxidation process, often requiring further removal. However, under the circumstance that the influence of organic matters in sewage on anaerobic ammonia oxidation and the current large background of recycling resources at home and abroad, the development of biological denitrification technology still needs to be further optimized.
Compared with the traditional biological denitrification process, the coupling of anaerobic ammoxidation and shortcut nitrification can save 60% of aeration energy consumption and 100% of organic carbon source, and can greatly reduce the output of residual sludge. However, nitrite oxidizing bacteria cannot be completely inhibited, short-cut nitrification is difficult to stably maintain as a nitrite source approach, and partial nitrate is generated and is difficult to further remove, so that the application of the short-cut nitrification coupling anaerobic ammonia oxidation technology in mainstream urban sewage plants is limited. Compared with short-range denitrification, the short-range denitrification provides nitrite matrixes for anaerobic ammoxidation, and also provides a new method for nitrate wastewater treatment. Therefore, short-cut denitrification coupling anaerobic ammonia oxidation processes are receiving a great deal of attention. However, the above short-cut nitrification and short-cut denitrification coupled anaerobic ammonia oxidation cannot realize the recovery of phosphorus, and it is significant to explore how to realize the synchronous removal of deep nitrogen and phosphorus.
The recovery of useful substances while achieving high quality meeting of water resources is a current development trend facing the problems of resource shortage, environmental destruction and pollution. Among them, carbon source recovery is a core problem of energy recovery, and it can be said that the treatment of organic matters in sewage and then the denitrification and dephosphorization are a better development direction, so that the love of the high-load activated sludge process is picked up again. The high-load activated sludge can realize the recovery of carbon sources and can also realize the removal of phosphorus by regulating and controlling the operation mode. The invention realizes carbon source recovery through a high-load activated sludge method, simultaneously realizes phosphorus removal through anaerobic/aerobic alternate mode operation, then realizes deep denitrification through coupling short-cut denitrification and short-cut nitrification with anaerobic ammonia oxidation, and finally realizes synchronous nitrogen and phosphorus removal and promotes energy recovery.
The invention comprises the following steps:
the invention aims to solve the technical problems and provides a device and a method for efficiently removing nitrogen and phosphorus in cooperation with carbon capture of municipal sewage reinforced by a high-load activated sludge process. The device specifically converts biodegradable organic matters in sewage into fermentation products such as volatile fatty acid and the like through an anaerobic/aerobic high-load activated sludge system, phosphate is released by phosphorus accumulating bacteria, and then excessive absorption of phosphorus is carried out under an aerobic condition; the effluent enters a short-cut denitrification coupling anaerobic ammonia oxidation system to remove partial ammonia nitrogen and residual organic matters in the sewage, and denitrifying bacteria reduce nitrate nitrogen into nitrite by utilizing a carbon source stored by a high-load activated sludge process to provide an electron donor for anaerobic ammonia oxidation bacteria; the effluent of the short-cut denitrification coupling anaerobic ammonia oxidation system enters the short-cut nitrification coupling anaerobic ammonia oxidation system to remove residual ammonia nitrogen, and the dissolved oxygen concentration in the short-cut denitrification coupling anaerobic ammonia oxidation system is controlled to convert ammonia nitrogen into nitrite nitrogen to provide an electron donor for anaerobic ammonia oxidation; the effluent flows back to the short-cut denitrification coupling anaerobic ammonia oxidation system to remove excessive nitrate nitrogen, thereby realizing synchronous removal of nitrogen and phosphorus in urban sewage and simultaneously promoting recycling of sewage resource energy.
The aim of the invention is realized by the following technical scheme:
the high-load activated sludge process reinforced urban sewage nitrogen and phosphorus co-efficient removal and carbon capture device comprises a water inlet tank (1), an anaerobic/aerobic high-load activated sludge system (2), a first intermediate water tank (3), a short-cut denitrification coupling anaerobic ammonia oxidation system (4), a second intermediate water tank (5), a short-cut nitrification coupling anaerobic ammonia oxidation system (6), a third intermediate water tank (7), a sludge storage tank (8), an anaerobic sludge fermentation system (9) and a fermentation liquor storage tank (10);
the anaerobic/aerobic high-load activated sludge system (2) is provided with a first peristaltic pump (2.1), an aeration device (2.2), a gas flowmeter (2.3), an air pump (2.4), a water outlet (2.5), a sludge discharge port (2.6) and a sludge discharge pump (2.7); the short-cut denitrification coupling anaerobic ammonia oxidation system (4) is provided with a second peristaltic pump (4.1), a first stirring device (4.2), a third peristaltic pump (4.3) and a water outlet (4.4); the short-cut nitrification coupling anaerobic ammonia oxidation system (6) is provided with a fourth peristaltic pump (6.1), a second stirring device (6.2), an aeration device (6.3), a gas flowmeter (6.4), an air pump (6.5) and a water outlet (6.6); the anaerobic sludge fermentation system (9) is provided with a sludge pump (9.1), a third stirring device (9.2) and a water outlet (9.3);
the water inlet tank (1) is connected with a water inlet of the anaerobic/aerobic high-load activated sludge system (2) through a first peristaltic pump (2.1); the effluent of the anaerobic/aerobic high-load activated sludge system (2) is discharged into a first intermediate water tank (3); the first intermediate water tank (3) is connected with a water inlet of the short-range denitrification coupling anaerobic ammonia oxidation system (4) through a second peristaltic pump (4.1); the effluent of the short-cut denitrification coupling anaerobic ammonia oxidation system (4) enters a second intermediate water tank (5); the second intermediate water tank (5) is connected with a water inlet of the short-cut nitrification coupling anaerobic ammonia oxidation system (6) through a fourth peristaltic pump (6.1); the effluent of the short-cut nitrification coupling anaerobic ammonia oxidation system (6) is connected with a first intermediate water tank (3); the anaerobic/aerobic high-load activated sludge system (2) discharges surplus sludge into a sludge storage tank (8) through a sludge discharge device; the sludge storage tank (8) is connected with a water inlet of the anaerobic sludge fermentation system (9) through a sludge pump (9.1); supernatant in the anaerobic sludge fermentation system (9) is discharged into a fermentation liquor storage tank (10); the fermentation liquor storage tank (10) is connected with the short-cut denitrification coupling anaerobic ammonia oxidation system (4) through a third peristaltic pump (4.3);
the method for strengthening urban sewage nitrogen and phosphorus co-efficient removal and carbon capture by the high-load activated sludge process is characterized by comprising the following steps of:
the wastewater in the water inlet tank enters an anaerobic/aerobic high-load activated sludge system through a first peristaltic pump, the anaerobic hydraulic retention time is 1.5-3h, the aerobic hydraulic retention time is controlled to be 1-3h, the dissolved oxygen is 0.5-1.5mg/L, and the sludge age is 2-4d; the effluent enters a first intermediate water tank, and sludge in the anaerobic/aerobic high-load activated sludge system is discharged into a sludge storage tank through a sludge discharge pump; the sludge in the sludge storage tank enters an anaerobic sludge fermentation system through a sludge pump for anaerobic fermentation, and the supernatant is discharged and enters a fermentation liquor storage tank;
inoculating short-range denitrification sludge and anaerobic ammonia oxidation sludge into a short-range denitrification coupling anaerobic ammonia oxidation system, and controlling the sludge concentration after inoculation to be 3000-8000mg/L; the accumulation rate of the inoculated short-range denitrification sludge on nitrite nitrogen is more than or equal to 70%, and the sludge concentration is 2500-4000mg/L; the nitrogen removal load of inoculated anaerobic ammoxidation sludge is more than or equal to 0.1 kgN/(m) 3 D) the sludge concentration is 3000-6000mg/L; the mass ratio of the inoculated short-range denitrification sludge to the anaerobic ammoxidation sludge is 1:3-1:5; the wastewater in the first intermediate water tank enters a short-range denitrification coupling anaerobic ammonia oxidation system through a second peristaltic pump; passing anaerobic fermentation supernatant in a fermentation liquor storage tank at the end of water inflowThe third peristaltic pump is added into a short-range denitrification coupling anaerobic ammonia oxidation system, so that the carbon-nitrogen ratio is 2.0-3.5; adding fermentation liquor, performing anoxic stirring for 3-6h, standing and precipitating for 30-60min after stirring, discharging supernatant, and controlling the water discharge ratio to 40-60%; the effluent of the short-cut denitrification coupling anaerobic ammonia oxidation system enters a second intermediate water tank;
inoculating short-cut nitrification sludge and anaerobic ammonia oxidation sludge into a short-cut nitrification coupling anaerobic ammonia oxidation system, and controlling the sludge concentration of the short-cut nitrification coupling anaerobic ammonia oxidation system to be 3000-5000mg/L; the accumulation rate of the inoculated short-cut nitrified sludge on nitrite is more than or equal to 80%, and the sludge concentration is 2000-4000mg/L; the nitrogen removal load of inoculated anaerobic ammoxidation sludge is more than or equal to 0.1 kgN/(m) 3 D) the sludge concentration is 3000-6000mg/L; the mass ratio of the inoculated short-cut nitrified sludge to the anaerobic ammoxidation sludge is 1:2-1:4; the wastewater in the second intermediate water tank enters a short-cut nitrification coupling anaerobic ammonia oxidation system through a fourth peristaltic pump, aeration is carried out for 2-6h after water inflow is finished, and dissolved oxygen is controlled to be 0.2-0.8mg/L; precipitating for 30-60min, discharging supernatant to a third intermediate water tank, and controlling the water discharge ratio at 50-80%; and the effluent of the third water tank flows back to the short-cut denitrification coupling anaerobic ammonia oxidation system to remove nitrate nitrogen, and the reflux ratio is controlled to ensure that the mass concentration ratio of the nitrate nitrogen to ammonia nitrogen in the water fed by the short-cut denitrification coupling anaerobic ammonia oxidation system is 1.0-1.5.
The technology realizes carbon capture and simultaneously removes phosphorus in sewage by a high-load activated sludge method, and then utilizes the combination of short-range denitrification and short-range nitrification coupling anaerobic ammonia oxidation to treat urban sewage. Raw water firstly enters an anaerobic/aerobic high-load activated sludge system, runs in an anaerobic/aerobic alternating mode, controls the hydraulic retention time, releases phosphorus by phosphorus accumulating bacteria under anaerobic conditions, and absorbs phosphorus excessively under aerobic conditions; the effluent enters a short-cut denitrification coupling anaerobic ammonia oxidation system, denitrifying bacteria in the system reduce nitrate to nitrite, and the reduction process of nitrite to nitrogen is not performed, wherein the accumulation rate of nitrite nitrogen in the process is more than or equal to 70%, so that stable nitrite accumulation is realized; the carbon source required by short-cut denitrification in the short-cut denitrification coupling anaerobic ammonia oxidation system is derived from the carbon source stored in the high-load activated sludge system, and the proper carbon-nitrogen ratio and the reaction time in the short-cut denitrification coupling anaerobic ammonia oxidation system are controlled to realize the accumulation of nitrite; the effluent of the short-cut denitrification coupling anaerobic ammonia oxidation system enters the short-cut nitrification coupling anaerobic ammonia oxidation system, the aeration time and the dissolved oxygen concentration are controlled through aerobic aeration, nitrifying bacteria oxidize ammonia nitrogen in raw water into nitrite instead of further oxidizing the nitrite into nitrate, accumulation of nitrite is realized, an electron donor is provided for anaerobic ammonia oxidation, and the effluent flows back to the short-cut denitrification coupling anaerobic ammonia oxidation system to remove excessive nitrate, so that synchronous removal of nitrogen and phosphorus in urban domestic sewage is realized.
The high-load activated sludge process enhanced urban sewage nitrogen and phosphorus co-efficient removal and carbon capture process and method have the following advantages:
1) The nitrite is produced by utilizing two ways of short-cut nitrification and short-cut denitrification, an electron donor is provided for anaerobic ammonia oxidation, the anaerobic ammonia oxidation denitrification efficiency is improved, the aeration energy consumption is greatly saved, an additional carbon source is not needed, and the operation cost is reduced;
2) The partial denitrification coupling anaerobic ammonia oxidation can further remove excessive nitrate generated by the partial denitrification coupling anaerobic ammonia oxidation system, so that the denitrification efficiency of the system is improved, and the water quality of the effluent is improved;
3) The organic carbon source in the urban sewage is captured by utilizing a high-load activated sludge method, and the recycling of the resource energy and the removal of phosphorus are realized.
Drawings
FIG. 1 is a flow chart of a process for strengthening urban sewage nitrogen and phosphorus co-efficient removal and carbon capture by a high-load activated sludge process. As in fig. 1: 1-a water inlet tank; 2-anaerobic/aerobic high-load activated sludge system; 3-a first intermediate tank; 4-short-cut denitrification coupling anaerobic ammonia oxidation system; 5-a second intermediate tank; 6-short-cut nitrification coupling anaerobic ammonia oxidation system; 7-a third intermediate water tank; 8-a sludge storage tank; 9-an anaerobic sludge fermentation system; 10-a fermentation liquor storage tank; 2.1-a first peristaltic pump; 2.2-aeration means; 2.3-a gas flow meter; 2.4-air pump; 2.6-a mud discharging port; 2.7-a sludge pump; 4.1-a second peristaltic pump; 4.2-a first stirring device; 4.3-a third peristaltic pump; 4.4-a water outlet; 6.1-fourth peristaltic pump; 6.2-a second stirring device; 6.3-aeration means; 6.4-gas flowmeter; 6.5-air pump; 9.1-a sludge pump; 9.2-a third stirring device; 9.3-water outlet.
Detailed Description
As shown in figure 1, the high-load activated sludge process reinforced urban sewage nitrogen and phosphorus co-efficient removal and carbon capture device comprises a water inlet tank (1), an anaerobic/aerobic high-load activated sludge system (2), a first intermediate water tank (3), a short-cut denitrification coupling anaerobic ammonia oxidation system (4), a second intermediate water tank (5), a short-cut nitrification coupling anaerobic ammonia oxidation system (6), a third intermediate water tank (7), a sludge storage tank (8), an anaerobic sludge fermentation system (9) and a fermentation liquor storage tank (10);
the anaerobic/aerobic high-load activated sludge system (2) is provided with a first peristaltic pump (2.1), an aeration device (2.2), a gas flowmeter (2.3), an air pump (2.4), a water outlet (2.5), a sludge discharge port (2.6) and a sludge discharge pump (2.7); the short-cut denitrification coupling anaerobic ammonia oxidation system (4) is provided with a second peristaltic pump (4.1), a first stirring device (4.2), a third peristaltic pump (4.3) and a water outlet (4.4); the short-cut nitrification coupling anaerobic ammonia oxidation system (6) is provided with a fourth peristaltic pump (6.1), a second stirring device (6.2), an aeration device (6.3), a gas flowmeter (6.4), an air pump (6.5) and a water outlet (6.6); the anaerobic sludge fermentation system (9) is provided with a sludge pump (9.1), a third stirring device (9.2) and a water outlet (9.3);
the water inlet tank (1) is connected with a water inlet of the anaerobic/aerobic high-load activated sludge system (2) through a first peristaltic pump (2.1); the effluent of the anaerobic/aerobic high-load activated sludge system (2) is discharged into a first intermediate water tank (3); the first intermediate water tank (3) is connected with a water inlet of the short-range denitrification coupling anaerobic ammonia oxidation system (4) through a second peristaltic pump (4.1); the effluent of the short-cut denitrification coupling anaerobic ammonia oxidation system (4) enters a second intermediate water tank (5); the second intermediate water tank (5) is connected with a water inlet of the short-cut nitrification coupling anaerobic ammonia oxidation system (6) through a fourth peristaltic pump (6.1); the effluent of the short-cut nitrification coupling anaerobic ammonia oxidation system (6) is connected with a first intermediate water tank (3); the anaerobic/aerobic high-load activated sludge system (2) discharges surplus sludge into a sludge storage tank (8) through a sludge discharge device; the sludge storage tank (8) is connected with a water inlet of the anaerobic sludge fermentation system (9) through a sludge pump (9.1); supernatant in the anaerobic sludge fermentation system (9) is discharged into a fermentation liquor storage tank (10); the fermentation liquor storage tank (10) is connected with the short-cut denitrification coupling anaerobic ammonia oxidation system (4) through a third peristaltic pump (4.3);
the method for strengthening urban sewage nitrogen and phosphorus co-efficient removal and carbon capture by the high-load activated sludge process comprises the following steps:
urban domestic sewage in the water inlet tank enters an anaerobic/aerobic high-load activated sludge system through a first peristaltic pump, the anaerobic hydraulic retention time is controlled to be 1.5-3h, the aerobic hydraulic retention time is controlled to be 1-3h, the dissolved oxygen is controlled to be 0.5-1.5mg/L, and the sludge age is controlled to be 2-4d; the anaerobic/aerobic high-load activated sludge system operates in an anaerobic/aerobic alternating mode, effluent enters a first intermediate water tank, organic matters in sewage of the anaerobic/aerobic high-load activated sludge system are transferred to sludge, and the sludge is discharged into a sludge storage tank through a sludge discharge pump; the method comprises the steps that sludge in a sludge storage pond enters an anaerobic sludge fermentation system through a sludge pump for anaerobic fermentation, the temperature of the anaerobic sludge fermentation system is controlled to be 30 ℃, the dissolved oxygen concentration is 0mg/L, the anaerobic sludge fermentation system operates in an intermittent mode, the operation time sequence is sequentially sludge feeding, stirring and sludge discharging, and supernatant is discharged to enter a fermentation liquor storage tank;
inoculating short-range denitrification sludge and anaerobic ammonia oxidation sludge into a short-range denitrification coupling anaerobic ammonia oxidation system, and controlling the sludge concentration after inoculation to be 3000-8000mg/L; the accumulation rate of the inoculated short-range denitrification sludge on nitrite nitrogen is more than or equal to 70%, and the sludge concentration is 2500-4000mg/L; the nitrogen removal load of inoculated anaerobic ammoxidation sludge is more than or equal to 0.1 kgN/(m) 3 D) the sludge concentration is 3000-6000mg/L; the mass ratio of the inoculated short-range denitrification sludge to the anaerobic ammoxidation sludge is 1:3-1:5; the short-cut denitrification coupling anaerobic ammonia oxidation system operates in an intermittent mode, and sewage in the first intermediate water tank enters the short-cut denitrification coupling anaerobic ammonia oxidation system through the second peristaltic pump; adding anaerobic fermentation supernatant in a fermentation liquor storage tank into a short-range denitrification coupling anaerobic ammonia oxidation system through a third peristaltic pump when water inflow is finished, so that the carbon-nitrogen ratio is 2.0-3.5; after adding the fermentation liquor, starting a first stirring device to perform anoxic stirring for 3-6 hours, and standing for sedimentation after stirring is finishedPrecipitating for 30-60min, discharging supernatant, and controlling the water discharge ratio to 40-60%; the effluent of the short-cut denitrification coupling anaerobic ammonia oxidation system enters a second intermediate water tank;
inoculating short-cut nitrification sludge and anaerobic ammonia oxidation sludge into a short-cut nitrification coupling anaerobic ammonia oxidation system, and controlling the sludge concentration of the short-cut nitrification coupling anaerobic ammonia oxidation system to be 3000-5000mg/L; the accumulation rate of the inoculated short-cut nitrified sludge on nitrite is more than or equal to 80%, and the sludge concentration is 2000-4000mg/L; the nitrogen removal load of inoculated anaerobic ammoxidation sludge is more than or equal to 0.1 kgN/(m) 3 D) the sludge concentration is 3000-6000mg/L; the mass ratio of the inoculated short-cut nitrified sludge to the anaerobic ammoxidation sludge is 1:2-1:4; the short-cut nitrification coupling anaerobic ammonia oxidation system operates in an intermittent mode, waste water in the second intermediate water tank enters the short-cut nitrification coupling anaerobic ammonia oxidation system through a fourth peristaltic pump, a second stirring device is started and aerated for 2-6 hours after water inlet is finished, and dissolved oxygen is controlled to be 0.2-0.8mg/L; precipitating for 30-60min after stirring, discharging supernatant to a third intermediate water tank, and controlling the water discharge ratio at 50-80%; and the effluent of the third water tank flows back to the short-cut denitrification coupling anaerobic ammonia oxidation system to remove nitrate nitrogen, and the reflux ratio is controlled to ensure that the mass concentration ratio of the nitrate nitrogen to ammonia nitrogen in the water fed by the short-cut denitrification coupling anaerobic ammonia oxidation system is 1.0-1.5.
The continuous test result shows that carbon capture is realized by a high-load activated sludge method, meanwhile, phosphorus in sewage is removed, and then urban sewage is treated by utilizing the combination of short-range denitrification and short-range nitrification coupling anaerobic ammonia oxidation, so that not only is synchronous deep removal of nitrogen and phosphorus realized, but also energy consumption is saved, no additional carbon source is needed, and recycling of resource and energy is realized.
Claims (2)
1. The high-load activated sludge method reinforced urban sewage nitrogen and phosphorus co-efficient removal and carbon capture device is characterized by comprising a water inlet tank (1), an anaerobic/aerobic high-load activated sludge system (2), a first intermediate water tank (3), a short-range denitrification coupling anaerobic ammonia oxidation system (4), a second intermediate water tank (5), a short-range denitrification coupling anaerobic ammonia oxidation system (6), a third intermediate water tank (7), a sludge storage tank (8), an anaerobic sludge fermentation system (9) and a fermentation liquor storage tank (10);
the anaerobic/aerobic high-load activated sludge system (2) is provided with a first peristaltic pump (2.1), an aeration device (2.2), a gas flowmeter (2.3), an air pump (2.4), a water outlet (2.5), a sludge discharge port (2.6) and a sludge discharge pump (2.7); the short-cut denitrification coupling anaerobic ammonia oxidation system (4) is provided with a second peristaltic pump (4.1), a first stirring device (4.2), a third peristaltic pump (4.3) and a water outlet (4.4); the short-cut nitrification coupling anaerobic ammonia oxidation system (6) is provided with a fourth peristaltic pump (6.1), a second stirring device (6.2), an aeration device (6.3), a gas flowmeter (6.4), an air pump (6.5) and a water outlet (6.6); the anaerobic sludge fermentation system (9) is provided with a sludge pump (9.1), a third stirring device (9.2) and a water outlet (9.3);
the water inlet tank (1) is connected with a water inlet of the anaerobic/aerobic high-load activated sludge system (2) through a first peristaltic pump (2.1); the effluent of the anaerobic/aerobic high-load activated sludge system (2) is discharged into a first intermediate water tank (3); the first intermediate water tank (3) is connected with a water inlet of the short-range denitrification coupling anaerobic ammonia oxidation system (4) through a second peristaltic pump (4.1); the effluent of the short-cut denitrification coupling anaerobic ammonia oxidation system (4) enters a second intermediate water tank (5); the second intermediate water tank (5) is connected with a water inlet of the short-cut nitrification coupling anaerobic ammonia oxidation system (6) through a fourth peristaltic pump (6.1); the effluent of the short-cut nitrification coupling anaerobic ammonia oxidation system (6) is connected with a first intermediate water tank (3); the anaerobic/aerobic high-load activated sludge system (2) discharges surplus sludge into a sludge storage tank (8) through a sludge discharge device; the sludge storage tank (8) is connected with a water inlet of the anaerobic sludge fermentation system (9) through a sludge pump (9.1); supernatant in the anaerobic sludge fermentation system (9) is discharged into a fermentation liquor storage tank (10); the fermentation liquor storage tank (10) is connected with the short-cut denitrification coupling anaerobic ammonia oxidation system (4) through a third peristaltic pump (4.3).
2. The method for strengthening urban sewage nitrogen and phosphorus co-efficient removal and carbon capture by using the high-load activated sludge process according to the device of claim 1, which is characterized by comprising the following steps:
the wastewater in the water inlet tank enters an anaerobic/aerobic high-load activated sludge system through a first peristaltic pump, the anaerobic hydraulic retention time is 1.5-3h, the aerobic hydraulic retention time is controlled to be 1-3h, the dissolved oxygen is 0.5-1.5mg/L, and the sludge age is 2-4d; the effluent enters a first intermediate water tank, and sludge in the anaerobic/aerobic high-load activated sludge system is discharged into a sludge storage tank through a sludge discharge pump; the sludge in the sludge storage tank enters an anaerobic sludge fermentation system through a sludge pump for anaerobic fermentation, and the supernatant is discharged and enters a fermentation liquor storage tank;
inoculating short-range denitrification sludge and anaerobic ammonia oxidation sludge into a short-range denitrification coupling anaerobic ammonia oxidation system, and controlling the sludge concentration after inoculation to be 3000-8000mg/L; the accumulation rate of the inoculated short-range denitrification sludge on nitrite nitrogen is more than or equal to 70%, and the sludge concentration is 2500-4000mg/L; the nitrogen removal load of inoculated anaerobic ammoxidation sludge is more than or equal to 0.1 kgN/(m) 3 D) the sludge concentration is 3000-6000mg/L; the mass ratio of the inoculated short-range denitrification sludge to the anaerobic ammoxidation sludge is 1:3-1:5; the wastewater in the first intermediate water tank enters a short-range denitrification coupling anaerobic ammonia oxidation system through a second peristaltic pump; adding anaerobic fermentation supernatant in a fermentation liquor storage tank into a short-range denitrification coupling anaerobic ammonia oxidation system through a third peristaltic pump when water inflow is finished, so that the carbon-nitrogen ratio is 2.0-3.5; adding fermentation liquor, performing anoxic stirring for 3-6h, standing and precipitating for 30-60min after stirring, discharging supernatant, and controlling the water discharge ratio to 40-60%; the effluent of the short-cut denitrification coupling anaerobic ammonia oxidation system enters a second intermediate water tank;
inoculating short-cut nitrification sludge and anaerobic ammonia oxidation sludge into a short-cut nitrification coupling anaerobic ammonia oxidation system, and controlling the sludge concentration of the short-cut nitrification coupling anaerobic ammonia oxidation system to be 3000-5000mg/L; the accumulation rate of the inoculated short-cut nitrified sludge on nitrite is more than or equal to 80%, and the sludge concentration is 2000-4000mg/L; the nitrogen removal load of inoculated anaerobic ammoxidation sludge is more than or equal to 0.1 kgN/(m) 3 D) the sludge concentration is 3000-6000mg/L; the mass ratio of the inoculated short-cut nitrified sludge to the anaerobic ammoxidation sludge is 1:2-1:4; the wastewater in the second intermediate water tank enters a short-cut nitrification coupling anaerobic ammonia oxidation system through a fourth peristaltic pump, aeration is carried out for 2-6h after water inflow is finished, and dissolved oxygen is controlled to be 0.2-0.8mg/L; precipitating for 30-60min, discharging supernatant to a third intermediate water tank, and controlling the water discharge ratio at 50-80%; the effluent of the third water tank flows back to the short-range denitrification coupling anaerobic ammonia oxidation system to carry out nitrateAnd (3) removing nitrogen, and controlling the reflux ratio to ensure that the mass concentration ratio of nitrate nitrogen to ammonia nitrogen in the water fed by the short-cut denitrification coupling anaerobic ammonia oxidation system is 1.0-1.5.
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