CN113716696A - Device and method for deep denitrification of landfill leachate based on low-oxygen operation reinforced two-stage anaerobic ammonia oxidation - Google Patents
Device and method for deep denitrification of landfill leachate based on low-oxygen operation reinforced two-stage anaerobic ammonia oxidation Download PDFInfo
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 153
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 73
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 70
- 230000003647 oxidation Effects 0.000 title claims abstract description 68
- 239000000149 chemical water pollutant Substances 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000001301 oxygen Substances 0.000 title claims abstract description 19
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 135
- 238000005273 aeration Methods 0.000 claims abstract description 94
- 238000003756 stirring Methods 0.000 claims abstract description 38
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000001556 precipitation Methods 0.000 claims abstract description 15
- 239000000523 sample Substances 0.000 claims description 42
- 230000002572 peristaltic effect Effects 0.000 claims description 40
- 238000010907 mechanical stirring Methods 0.000 claims description 17
- 238000012544 monitoring process Methods 0.000 claims description 15
- 239000007789 gas Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000005070 sampling Methods 0.000 claims description 8
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 6
- 238000006396 nitration reaction Methods 0.000 claims description 6
- 238000004062 sedimentation Methods 0.000 claims description 6
- 239000006228 supernatant Substances 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 4
- 238000012806 monitoring device Methods 0.000 claims description 3
- 230000011218 segmentation Effects 0.000 claims description 3
- 239000010802 sludge Substances 0.000 claims description 3
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 3
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 3
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 abstract description 21
- 239000002351 wastewater Substances 0.000 abstract description 3
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 abstract description 2
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 230000002708 enhancing effect Effects 0.000 abstract description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 abstract 3
- CVTZKFWZDBJAHE-UHFFFAOYSA-N [N].N Chemical group [N].N CVTZKFWZDBJAHE-UHFFFAOYSA-N 0.000 abstract 1
- 238000004134 energy conservation Methods 0.000 abstract 1
- 239000010813 municipal solid waste Substances 0.000 description 6
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 4
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 2
- 241001453382 Nitrosomonadales Species 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 238000005276 aerator Methods 0.000 description 1
- 230000001651 autotrophic effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000011550 stock solution Substances 0.000 description 1
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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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
- C02F3/303—Nitrification and denitrification treatment characterised by the nitrification
-
- 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
- C02F3/302—Nitrification and denitrification treatment
- C02F3/307—Nitrification and denitrification treatment characterised by direct conversion of nitrite to molecular nitrogen, e.g. by using the Anammox process
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
A device and a method for enhancing two-stage anaerobic ammonia oxidation to deeply denitrify landfill leachate based on low oxygen operation belong to the technical field of biological denitrification of low carbon-nitrogen ratio high ammonia nitrogen wastewater. In the device, a raw percolate water tank is communicated with a short-cut nitrification SBR reactor, the short-cut nitrification SBR reactor is communicated with an intermediate water tank, the intermediate water tank is communicated with an anaerobic ammonia oxidation SBR reactor, and the anaerobic ammonia oxidation SBR reactor is communicated with a water outlet tank. The method comprises the steps of feeding water into a short-cut nitrification SBR reactor, carrying out anoxic stirring on the short-cut nitrification SBR reactor, carrying out aerobic aeration on the short-cut nitrification SBR reactor, carrying out precipitation drainage on the short-cut nitrification SBR reactor, feeding water into an anaerobic ammonium oxidation SBR reactor, carrying out micro aeration stirring on the anaerobic ammonium oxidation SBR reactor, and carrying out precipitation drainage on the anaerobic ammonium oxidation SBR reactor. The method has the advantages of advanced process, simple device structure, energy conservation and consumption reduction, and solves the problem that the ammonia nitrogen in the effluent does not reach the standard due to the ammonia nitrogen residue in the anoxic section of the advanced denitrification process based on anaerobic ammonia oxidation.
Description
Technical Field
The invention relates to a device and a method for deep denitrification of landfill leachate based on low-oxygen operation reinforced two-stage anaerobic ammonia oxidation, belongs to the technical field of biological denitrification of high ammonia nitrogen wastewater with low carbon-nitrogen ratio, and is suitable for biological denitrification process of high ammonia nitrogen wastewater such as landfill leachate generated by refuse classification treatment.
Background
In recent years, with the increasing of people's living standard, the output of municipal solid waste is increasing, and although the trend of garbage classification is rising gradually, the garbage classification disposal can not reduce the moisture contained in the garbage, and a large amount of garbage leachate can still be generated. The landfill leachate has the water quality characteristics of complex components, large water quality and water quantity change, high concentration of organic matters and ammonia nitrogen, imbalance proportion of microbial nutrient elements and the like, so that the landfill leachate becomes one of the unsolved problems in the international range.
With the gradual rise of denitrification technology based on anaerobic ammonia oxidation, the short-cut nitrification can be coupled with the denitrification technology to form a treatment process of coupling the short-cut nitrification with the anaerobic ammonia oxidation. On one hand, in the traditional plug flow anaerobic-anoxic-aerobic biological treatment process, the nitrate nitrogen in the effluent water is still possibly overproof by coupling short-cut nitrification and anaerobic ammonia oxidation in the post-positioned aerobic section, and the residual nitrate nitrogen needs to be further removed by refluxing to the anoxic section. On the other hand, the anaerobic-aerobic-anoxic biological treatment process faces the embarrassment that the residual ammonia nitrogen in the anoxic section cannot be removed because the organic matters in the landfill leachate are consumed by the nitration reaction in the aerobic section. Can cause the effluent ammonia nitrogen not to meet the requirements of the current national sewage discharge standard on the effluent ammonia nitrogen. How to improve the traditional process, improve the ammonia nitrogen removal capability of an anoxic section in an anaerobic-aerobic-anoxic biological treatment process, strengthen the quality of anaerobic ammonia oxidation denitrification effluent water and ensure that the ammonia nitrogen of the effluent water reaches the discharge standard is a problem to be solved urgently.
Disclosure of Invention
The invention aims to solve the technical problems and provides a method for reinforcing two-stage anaerobic ammonia oxidation to infiltrate garbage based on low oxygen operationThe method comprises the steps of firstly feeding water into a short-range nitrification SBR reactor, pumping a part of landfill leachate into the short-range nitrification SBR reactor, then carrying out anoxic stirring, and utilizing organic matters in the fed water to remove residual NO in the reactor in the last period2 -Removing N by denitrification, then carrying out aerobic aeration, passing through high-activity ammonia oxidizing bacteria under low dissolved oxygen, and carrying out short-cut nitrification on NH in the SBR reactor4 +Conversion of-N to NO by short-cut nitration2 --N, draining into an intermediate tank after complete precipitation; after meeting the condition of anaerobic ammoxidation, the mixture enters an anaerobic ammoxidation SBR reactor to be subjected to micro-aeration anoxic stirring. The anoxic section is used for micro-aeration, so that nitrite shortage caused by denitrification can be removed, further generated residual ammonia nitrogen is generated, the residual ammonia nitrogen in the anaerobic ammonia oxidation SBR reactor is converted into nitrate nitrogen and nitrite nitrogen, the nitrate nitrogen is converted into nitrite nitrogen, the anaerobic ammonia oxidation reaction can be further promoted, the ammonia nitrogen removal effect is improved, the problem that effluent ammonia nitrogen does not reach the standard is solved, and finally economical and efficient landfill leachate autotrophic denitrification is realized.
The purpose of the invention is realized by the following technical scheme:
the utility model provides a device of two segmentation anaerobic ammonia oxidation to landfill leachate degree of depth denitrogenation is reinforceed based on low oxygen operation which characterized in that: the device comprises a landfill leachate raw water tank (1), a short-cut nitrification SBR reactor (7), an intermediate water tank (30), an anaerobic ammonia oxidation SBR reactor (18) and a water outlet tank (22). A first temperature control heating device (2) is arranged in the middle of a raw percolate water tank (1), the raw percolate water tank (1) is communicated with a first peristaltic pump (4) and a short-cut nitrification SBR reactor (7) through a first water inlet pipe (3), the short-cut nitrification SBR reactor (7) is communicated with a second peristaltic pump (33) and an intermediate water tank (30) through a first water outlet pipe (32), the intermediate water tank (30) is provided with a second temperature control heating device (14), the intermediate water tank (30) is communicated with a third peristaltic pump (15) and an anaerobic ammonia oxidation SBR reactor (18) through a second water inlet pipe (29), and the anaerobic ammonia oxidation SBR reactor (18) is communicated with a fourth peristaltic pump (24) and a water outlet tank (22) through a second water outlet pipe (21);
3 sampling monitoring valves are arranged on the short-cut nitrification SBR reactor (7) from top to bottom, a first water inlet control valve (4) and a first peristaltic pump (38) are arranged on the first water inlet pipe (3), and a first water outlet control valve (31) and a second peristaltic pump (33) are arranged on the first water outlet pipe (32); a first mechanical stirring device (8), a first DO probe (6), a first ORP probe (9) and a first pH probe (10) are arranged inside the short-cut nitrification SBR reactor (7), wherein the first DO probe (6), the first ORP probe (9) and the first pH probe (10) are respectively connected with a first DO instrument (5), a first ORP instrument (13) and a first pH instrument (12) host through connecting wires. A first microporous aeration head (34) and a first aeration pump (36) are arranged at the bottom of the short-cut nitrification SBR reactor (7), the first microporous aeration head (34) is connected with the first aeration pump (36) through a first aeration pipe (35), and a first gas flow meter (37) is arranged on the first aeration pipe (35);
3 sampling monitoring valves (19) are arranged on the anaerobic ammonia oxidation reactor (18) from top to bottom, a second water inlet control valve (15) and a third peristaltic pump (28) are arranged on a second water inlet pipe (29), and a second water outlet control valve (23) and a fourth peristaltic pump (24) are arranged on a second water outlet pipe (21); the anaerobic ammonia oxidation reactor (18) is internally provided with a second mechanical stirring device (17), a second DO probe (40), a second ORP probe (26) and a second pH probe (25), wherein the second DO probe (40), the second ORP probe (26) and the second pH probe (25) are respectively connected with a second DO meter (39), a second ORP meter (16) and a second pH meter (20) host through connecting wires. A second microporous aeration head (41) and a second aeration pump (42) are arranged at the bottom of the anaerobic ammonia oxidation SBR reactor (18), the second microporous aeration head (41) is connected with the second aeration pump (42) through a second aeration pipe (43), and a second gas flowmeter (27) is arranged on the second aeration pipe (43);
a method for strengthening two-stage anaerobic ammonia oxidation to deeply denitrify landfill leachate based on low oxygen operation is characterized by comprising the following steps:
water inlet of the short-cut nitrification SBR reactor: injecting the leachate serving as a raw solution into a raw water tank (1) of the landfill leachate, controlling the temperature of the raw water tank (1) of the landfill leachate at 30 ℃ through a first temperature control device (2), opening a first water inlet control valve (4), and pumping the landfill leachate into a short-cut nitrification SBR reactor (7) through a first water inlet pipe (3) and a first peristaltic pump (38);
anoxic stirring of the short-cut nitrification SBR reactor: starting the short-range nitration SBR reactor, starting a first mechanical stirring device (8), entering an anoxic stirring stage after water inflow is finished, carrying out anoxic reaction, setting the anoxic stirring time to be more than 3 hours, monitoring pH in real time in the stirring process, and stopping stirring if an inflection point appears on a pH curve;
aerobic aeration of the short-cut nitrification SBR reactor: starting a first aeration system consisting of a first microporous aeration head (34), a first aeration pump (36) and a first aeration pipe (35), carrying out short-cut nitrification on the residual landfill leachate in the short-cut nitrification SBR reactor (7), monitoring by a real-time control device to maintain dissolved oxygen DO within the range of 0.1-0.5mg/L, setting the aeration time to be more than 6 hours, and finishing the aerobic aeration stage when the pH ammonia valley point is monitored; the pH value is maintained within the range of 7.5-8.0 by a pH monitoring device, if the pH value is too high or too low, sodium bicarbonate is added to maintain the pH value within the range, and the water feeding NH of the short-cut nitrification SBR reactor (7) is maintained4 +N loading in the range from 0.5 to 1.0kgNH4 +-N/(m3D) by maintaining the pH and NH4 +-N loading in the above range to give an average free ammonia FA concentration in the short-cut nitrated SBR reactor (7) in the range of 13.5-18.0 mg/L;
and (3) short-cut nitrification SBR reactor precipitation drainage: after aerobic stirring, carrying out precipitation for 0.5 hour to fully separate mud from water, carrying out precipitation drainage after the precipitation is finished, opening a second peristaltic pump (33) and a first drainage valve (31), and discharging supernatant to an intermediate water tank (30);
feeding water into an anaerobic ammonia oxidation SBR reactor: starting the anaerobic ammonia oxidation reactor (18), opening a second water inlet control valve (15), and enabling the anaerobic ammonia oxidation reactor to contain NH through a second water inlet pipe (29) and a third peristaltic pump (15)4 +-N and NO2 --N landfill leachate is pumped from the intermediate tank (30) to the anammox reactor (18), the intermediate tank (30) is maintained at 30 ℃ by the second temperature control device (14);
micro-aeration stirring of an anaerobic ammonia oxidation SBR reactor: starting the anaerobic ammonia oxidation SBR reactor (18), starting a second mechanical stirring device (17), and feeding the mixture into a micro-reactorThe aeration stirring stage is characterized in that micro-aeration stirring is carried out in an anaerobic ammonia oxidation system, firstly, a mechanical stirring device is adjusted to ensure that sludge and water are completely mixed and fully reacted, the anoxic stirring time is set to be 12 hours, then, a second aeration system consisting of a second microporous aeration head (41), a second aeration pump (42) and a second aeration pipe (43) is started, the dissolved oxygen DO is maintained within the range of 0.05-0.1mg/L through monitoring of a real-time control device, and the aeration time is set to be 12 hours and is consistent with the set anoxic stirring time. When NO is in the anaerobic ammonia oxidation SBR reactor (18)2 --N concentrations are all less than 15mg/L and NH4 +When the-N concentrations are all less than 5mg/L, the anaerobic ammonia oxidation process is completed;
and (3) settling and draining of the anaerobic ammonia oxidation SBR reactor: and after anoxic stirring, carrying out sedimentation for 0.5 hour to separate mud from water, after the sedimentation is finished, draining water, opening a fourth peristaltic pump (24) and a second drain valve (23), and discharging supernatant through a second water outlet pipe (21), wherein the drainage ratio is 40%.
Compared with the prior art, the device and the method for deeply denitrifying landfill leachate based on the whole-course low-oxygen operation have the following innovation points:
1) by micro-aeration of the anaerobic ammonia oxidation anoxic section, ammonia oxidizing bacteria can be gradually enriched in the anoxic section, so that residual ammonia nitrogen in the anoxic section can be removed, the deep denitrification capability of the system on landfill leachate can be improved, the adaptability of the anaerobic ammonia oxidation system to nitrite shortage can be improved, the effluent ammonia nitrogen can reach the discharge standard, and the system stability can be improved;
2) the anoxic section micro-aerates, and simultaneously can further remove more complex organic matters in the landfill leachate, and the conversion of ammonia nitrogen into nitrite nitrogen can better promote the anaerobic ammonia oxidation reaction, increase the removal of ammonia nitrogen and improve the denitrification efficiency;
3) micro-aeration in the short-cut nitrification stage can greatly reduce aeration energy consumption, reduce operation cost, improve treatment efficiency and reduce sludge yield;
4) the process flow is simple, the operation mode is flexible, the method can be applied based on the treatment flows of the existing refuse landfill and refuse incineration plants, the high-efficiency denitrification of the landfill leachate is realized, and the operation and construction cost is greatly reduced;
5) after the technology is mature and operated, the landfill leachate stock solution can be directly treated without dilution, so that the operation and management are convenient;
drawings
Fig. 1 is a schematic structural diagram of a device for enhancing two-stage anaerobic ammonia oxidation based on low oxygen operation to deeply denitrify landfill leachate, which is disclosed by the invention.
The numerical devices in the figures are: 1-raw water tank of percolate; 2-a first temperature-controlled heating device; 3-a first water inlet pipe; 4-a first water inlet control valve; 5-a first DO meter; 6-first DO probe; 7-short-cut nitration SBR reactor; 8-a first mechanical stirring device; 9-pH probe; 10-first ORP probe; 11-a first sampling valve; 12-a first ORP meter; 13-a first pH meter; 14-a second temperature controlled heating device; 15-a second water inlet control valve; 16-a second pH meter; 17-a second mechanical stirring device; 18-an anammox reactor; 19-a second sampling valve; 20-a second ORP meter; 21-a second water outlet pipe; 22-water outlet tank; 23-a second effluent control valve; 24-a fourth peristaltic pump; 25-a second ORP probe; 26-a second pH probe; 27-a second gas flow meter; 28-a third peristaltic pump; 29-a second water inlet pipe; 30-an intermediate water tank; 31-a first water outlet control valve; 32-a first water outlet pipe; 33-a second peristaltic pump; 34-a microporous aeration head; 35-an aerator pipe; 36-an aeration pump; 37-a first gas flow meter; 38-a first peristaltic pump; 39-a second DO meter; 40-a second DO probe; 41-a second microporous aeration head; 42-a second aeration pump; 43-second aeration pipe.
Detailed Description
The denitrification system and the operation method according to the present invention are further described with reference to FIG. 1:
the utility model provides a device of two segmentation anaerobic ammonia oxidation to landfill leachate degree of depth denitrogenation is reinforceed based on low oxygen operation which characterized in that: the device comprises a landfill leachate raw water tank (1), a short-cut nitrification SBR reactor (7), an intermediate water tank (30), an anaerobic ammonia oxidation SBR reactor (18) and a water outlet tank (22). A first temperature control heating device (2) is arranged in the middle of a raw percolate water tank (1), the raw percolate water tank (1) is communicated with a first peristaltic pump (4) and a short-cut nitrification SBR reactor (7) through a first water inlet pipe (3), the short-cut nitrification SBR reactor (7) is communicated with a second peristaltic pump (33) and an intermediate water tank (30) through a first water outlet pipe (32), the intermediate water tank (30) is provided with a second temperature control heating device (14), the intermediate water tank (30) is communicated with a third peristaltic pump (15) and an anaerobic ammonia oxidation SBR reactor (18) through a second water inlet pipe (29), and the anaerobic ammonia oxidation SBR reactor (18) is communicated with a fourth peristaltic pump (24) and a water outlet tank (22) through a second water outlet pipe (21);
3 sampling monitoring valves are arranged on the short-cut nitrification SBR reactor (7) from top to bottom, a first water inlet control valve (4) and a first peristaltic pump (38) are arranged on the first water inlet pipe (3), and a first water outlet control valve (31) and a second peristaltic pump (33) are arranged on the first water outlet pipe (32); a first mechanical stirring device (8), a first DO probe (6), a first ORP probe (9) and a first pH probe (10) are arranged inside the short-cut nitrification SBR reactor (7), wherein the first DO probe (6), the first ORP probe (9) and the first pH probe (10) are respectively connected with a first DO instrument (5), a first ORP instrument (13) and a first pH instrument (12) host through connecting wires. A first microporous aeration head (34) and a first aeration pump (36) are arranged at the bottom of the short-cut nitrification SBR reactor (7), the first microporous aeration head (34) is connected with the first aeration pump (36) through a first aeration pipe (35), and a first gas flow meter (37) is arranged on the first aeration pipe (35);
3 sampling monitoring valves (19) are arranged on the anaerobic ammonia oxidation reactor (18) from top to bottom, a second water inlet control valve (15) and a third peristaltic pump (28) are arranged on a second water inlet pipe (29), and a second water outlet control valve (23) and a fourth peristaltic pump (24) are arranged on a second water outlet pipe (21); the anaerobic ammonia oxidation reactor (18) is internally provided with a second mechanical stirring device (17), a second DO probe (40), a second ORP probe (26) and a second pH probe (25), wherein the second DO probe (40), the second ORP probe (26) and the second pH probe (25) are respectively connected with a second DO meter (39), a second ORP meter (16) and a second pH meter (20) host through connecting wires. A second microporous aeration head (41) and a second aeration pump (42) are arranged at the bottom of the anaerobic ammonia oxidation SBR reactor (18), the second microporous aeration head (41) is connected with the second aeration pump (42) through a second aeration pipe (43), and a second gas flowmeter (27) is arranged on the second aeration pipe (43);
a method for strengthening two-stage anaerobic ammonia oxidation to deeply denitrify landfill leachate based on low oxygen operation is characterized by comprising the following steps:
water inlet of the short-cut nitrification SBR reactor: injecting the leachate serving as a raw solution into a raw water tank (1) of the landfill leachate, controlling the temperature of the raw water tank (1) of the landfill leachate at 30 ℃ through a first temperature control device (2), opening a first water inlet control valve (4), and pumping the landfill leachate into a short-cut nitrification SBR reactor (7) through a first water inlet pipe (3) and a first peristaltic pump (38);
anoxic stirring of the short-cut nitrification SBR reactor: starting the short-range nitration SBR reactor, starting a first mechanical stirring device (8), entering an anoxic stirring stage after water inflow is finished, carrying out anoxic reaction, setting the anoxic stirring time to be more than 3 hours, monitoring pH in real time in the stirring process, and stopping stirring if an inflection point appears on a pH curve;
aerobic aeration of the short-cut nitrification SBR reactor: starting a first aeration system consisting of a first microporous aeration head (34), a first aeration pump (36) and a first aeration pipe (35), carrying out short-cut nitrification on the residual landfill leachate in the short-cut nitrification SBR reactor (7), monitoring by a real-time control device to maintain dissolved oxygen DO within the range of 0.1-0.5mg/L, setting the aeration time to be more than 6 hours, and finishing the aerobic aeration stage when the pH ammonia valley point is monitored; the pH value is maintained within the range of 7.5-8.0 by a pH monitoring device, if the pH value is too high or too low, sodium bicarbonate is added to maintain the pH value within the range, and the water feeding NH of the short-cut nitrification SBR reactor (7) is maintained4 +N loading in the range from 0.5 to 1.0kgNH4 +-N/(m3D) by maintaining the pH and NH4 +-N loading in the above range to give an average free ammonia FA concentration in the short-cut nitrated SBR reactor (7) in the range of 13.5-18.0 mg/L;
and (3) short-cut nitrification SBR reactor precipitation drainage: after aerobic stirring, carrying out precipitation for 0.5 hour to fully separate mud from water, carrying out precipitation drainage after the precipitation is finished, opening a second peristaltic pump (33) and a first drainage valve (31), and discharging supernatant to an intermediate water tank (30);
feeding water into an anaerobic ammonia oxidation SBR reactor: starting the anaerobic ammonia oxidation reactor (18), opening a second water inlet control valve (15), and enabling the anaerobic ammonia oxidation reactor to contain NH through a second water inlet pipe (29) and a third peristaltic pump (15)4 +-N and NO2 --N landfill leachate is pumped from the intermediate tank (30) to the anammox reactor (18), the intermediate tank (30) is maintained at 30 ℃ by the second temperature control device (14);
micro-aeration stirring of an anaerobic ammonia oxidation SBR reactor: the method is characterized in that an anaerobic ammonia oxidation SBR reactor (18) is started, a second mechanical stirring device (17) is started, micro-aeration stirring is carried out in an anaerobic ammonia oxidation system in a micro-aeration stirring stage, the mechanical stirring device is adjusted to ensure that muddy water is completely mixed and fully reacts, the anoxic stirring time is set to be 12 hours, then a second aeration system consisting of a second microporous aeration head (41), a second aeration pump (42) and a second aeration pipe (43) is started, dissolved oxygen DO is maintained within the range of 0.05-0.1mg/L through monitoring of a real-time control device, the aeration time is set to be 12 hours, and the aeration time is consistent with the set anoxic stirring time. When NO is in the anaerobic ammonia oxidation SBR reactor (18)2 --N concentrations are all less than 15mg/L and NH4 +When the-N concentrations are all less than 5mg/L, the anaerobic ammonia oxidation process is completed;
and (3) settling and draining of the anaerobic ammonia oxidation SBR reactor: and after anoxic stirring, carrying out sedimentation for 0.5 hour to separate mud from water, after the sedimentation is finished, draining water, opening a fourth peristaltic pump (24) and a second drain valve (23), and discharging supernatant through a second water outlet pipe (21), wherein the drainage ratio is 40%.
The average ammonia nitrogen concentration of the influent landfill leachate is 1500-2250mg/L, COD/NH4 +The test results of the stable operation of N under the conditions of 1.0-2.2 show that: the total nitrogen of the effluent of the system is less than 30mg/L, and the TN removal rate is more than 90%. The ammonia nitrogen of the effluent of the system is less than 5mg/L, the ammonia nitrogen removal rate is more than 95 percent, and the aim of deep denitrification of the landfill leachate is fulfilled.
The foregoing is an exemplary embodiment of the present invention, and the practice of the present invention is not limited thereto.
Claims (2)
1. The utility model provides a device of two segmentation anaerobic ammonia oxidation to landfill leachate degree of depth denitrogenation is reinforceed based on low oxygen operation which characterized in that: the device comprises a landfill leachate raw water tank (1), a short-cut nitrification SBR reactor (7), an intermediate water tank (30), an anaerobic ammonia oxidation SBR reactor (18) and a water outlet tank (22). A first temperature control heating device (2) is arranged in the middle of a raw percolate water tank (1), the raw percolate water tank (1) is communicated with a first peristaltic pump (4) and a short-cut nitrification SBR reactor (7) through a first water inlet pipe (3), the short-cut nitrification SBR reactor (7) is communicated with a second peristaltic pump (33) and an intermediate water tank (30) through a first water outlet pipe (32), the intermediate water tank (30) is provided with a second temperature control heating device (14), the intermediate water tank (30) is communicated with a third peristaltic pump (15) and an anaerobic ammonia oxidation SBR reactor (18) through a second water inlet pipe (29), and the anaerobic ammonia oxidation SBR reactor (18) is communicated with a fourth peristaltic pump (24) and a water outlet tank (22) through a second water outlet pipe (21);
3 sampling monitoring valves are arranged on the short-cut nitrification SBR reactor (7) from top to bottom, a first water inlet control valve (4) and a first peristaltic pump (38) are arranged on the first water inlet pipe (3), and a first water outlet control valve (31) and a second peristaltic pump (33) are arranged on the first water outlet pipe (32); a first mechanical stirring device (8), a first DO probe (6), a first ORP probe (9) and a first pH probe (10) are arranged inside the short-cut nitrification SBR reactor (7), wherein the first DO probe (6), the first ORP probe (9) and the first pH probe (10) are respectively connected with a first DO instrument (5), a first ORP instrument (13) and a first pH instrument (12) host through connecting wires. A first microporous aeration head (34) and a first aeration pump (36) are arranged at the bottom of the short-cut nitrification SBR reactor (7), the first microporous aeration head (34) is connected with the first aeration pump (36) through a first aeration pipe (35), and a first gas flow meter (37) is arranged on the first aeration pipe (35);
3 sampling monitoring valves (19) are arranged on the anaerobic ammonia oxidation reactor (18) from top to bottom, a second water inlet control valve (15) and a third peristaltic pump (28) are arranged on a second water inlet pipe (29), and a second water outlet control valve (23) and a fourth peristaltic pump (24) are arranged on a second water outlet pipe (21); the anaerobic ammonia oxidation reactor (18) is internally provided with a second mechanical stirring device (17), a second DO probe (40), a second ORP probe (26) and a second pH probe (25), wherein the second DO probe (40), the second ORP probe (26) and the second pH probe (25) are respectively connected with a second DO meter (39), a second ORP meter (16) and a second pH meter (20) host through connecting wires. The bottom of the anaerobic ammonia oxidation SBR reactor (18) is provided with a second microporous aeration head (41) and a second aeration pump (42), the second microporous aeration head (41) is connected with the second aeration pump (42) through a second aeration pipe (43), and the second aeration pipe (43) is provided with a second gas flowmeter (27).
2. Method for applying the device according to claim 1, characterized in that it comprises the following steps:
water inlet of the short-cut nitrification SBR reactor: injecting the leachate serving as a raw solution into a raw water tank (1) of the landfill leachate, controlling the temperature of the raw water tank (1) of the landfill leachate at 30 ℃ through a first temperature control device (2), opening a first water inlet control valve (4), and pumping the landfill leachate into a short-cut nitrification SBR reactor (7) through a first water inlet pipe (3) and a first peristaltic pump (38);
anoxic stirring of the short-cut nitrification SBR reactor: starting the short-range nitration SBR reactor, starting a first mechanical stirring device (8), entering an anoxic stirring stage after water inflow is finished, carrying out anoxic reaction, setting the anoxic stirring time to be more than 3 hours, monitoring pH in real time in the stirring process, and stopping stirring if an inflection point appears on a pH curve;
aerobic aeration of the short-cut nitrification SBR reactor: starting a first aeration system consisting of a first microporous aeration head (34), a first aeration pump (36) and a first aeration pipe (35), carrying out short-cut nitrification on the residual landfill leachate in the short-cut nitrification SBR reactor (7), monitoring by a real-time control device to maintain dissolved oxygen DO within the range of 0.1-0.5mg/L, setting the aeration time to be more than 6 hours, and finishing the aerobic aeration stage when the pH ammonia valley point is monitored; the pH value is maintained within the range of 7.5-8.0 by a pH monitoring device, if the pH value is too high or too low, sodium bicarbonate is added to maintain the pH value within the range, and the water feeding NH of the short-cut nitrification SBR reactor (7) is maintained4 +N loading in the range from 0.5 to 1.0kgNH4 +-N/(m3D) by maintaining the pH and NH4 +N loading in the above range for short-range niterThe average free ammonia FA concentration in the SBR reactor (7) is in the range of 13.5-18.0 mg/L;
and (3) short-cut nitrification SBR reactor precipitation drainage: after aerobic stirring, carrying out precipitation for 0.5 hour to fully separate mud from water, carrying out precipitation drainage after the precipitation is finished, opening a second peristaltic pump (33) and a first drainage valve (31), and discharging supernatant to an intermediate water tank (30);
feeding water into an anaerobic ammonia oxidation SBR reactor: starting the anaerobic ammonia oxidation reactor (18), opening a second water inlet control valve (15), and enabling the anaerobic ammonia oxidation reactor to contain NH through a second water inlet pipe (29) and a third peristaltic pump (15)4 +-N and NO2 --N landfill leachate is pumped from the intermediate tank (30) to the anammox reactor (18), the intermediate tank (30) is maintained at 30 ℃ by the second temperature control device (14);
micro-aeration stirring of an anaerobic ammonia oxidation SBR reactor: starting an anaerobic ammonia oxidation SBR reactor (18), starting a second mechanical stirring device (17), entering a micro-aeration stirring stage, firstly, ensuring that sludge and water are completely mixed and fully react by adjusting the mechanical stirring device, setting the anoxic stirring time to be 12 hours, then, starting a second aeration system consisting of a second microporous aeration head (41), a second aeration pump (42) and a second aeration pipe (43), monitoring and maintaining dissolved oxygen DO within the range of 0.05-0.1mg/L by a real-time control device, setting the aeration time to be 12 hours, and when NO in the anaerobic ammonia oxidation SBR reactor (18)2 --N concentrations are all less than 15mg/L and NH4 +When the-N concentrations are all less than 5mg/L, the anaerobic ammonia oxidation process is completed;
and (3) settling and draining of the anaerobic ammonia oxidation SBR reactor: and after anoxic stirring, carrying out sedimentation for 0.5 hour to separate mud from water, after the sedimentation is finished, draining water, opening a fourth peristaltic pump (24) and a second drain valve (23), and discharging supernatant through a second water outlet pipe (21), wherein the drainage ratio is 40%.
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