CN113716695A - Device and method for deep denitrification of landfill leachate by enhanced shortcut nitrification coupled anaerobic ammonia oxidation based on high dissolved oxygen operation - Google Patents
Device and method for deep denitrification of landfill leachate by enhanced shortcut nitrification coupled anaerobic ammonia oxidation based on high dissolved oxygen operation Download PDFInfo
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Abstract
A device and a method for deep denitrification of landfill leachate by enhanced partial nitrification coupled anaerobic ammonia oxidation based on high dissolved oxygen operation belong to the technical field of biological denitrification of low-carbon-nitrogen-ratio high-ammonia-nitrogen wastewater. The method comprises the following steps: the method comprises the steps of feeding water into the integrated rotating drum filler SBR reactor, performing high-oxygen aeration on the integrated rotating drum filler SBR reactor and draining water from the integrated rotating drum filler SBR reactor. The invention is used for deep and efficient denitrification treatment of landfill leachate generated by garbage classification based on short-cut nitrification coupling anaerobic ammonia oxidation, has advanced process, simple structure and simple operation, can strengthen the attachment growth of ammonia oxidizing bacteria on the surface of a filler by the aeration operation of the rotary drum filler and high dissolved oxygen to form an aerobic biomembrane, strengthens the protection of the anaerobic ammonia oxidizing bacteria taking sponge filler as a carrier, ensures that the system can operate in a high dissolved oxygen environment, and improves the denitrification efficiency.
Description
Technical Field
The invention relates to a device and a method for deep denitrification of landfill leachate based on high dissolved oxygen operation and rotating biological filler carrier reinforced partial nitrification coupled 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 an efficient biological denitrification process of high ammonia nitrogen wastewater such as landfill leachate generated by garbage classification.
Background
In recent years, the process of urbanization is continuously promoted, the yield of municipal solid waste is continuously increased, and although the trend of garbage classification is gradually raised, 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. The landfill leachate can not be economically and efficiently treated by adopting a single treatment technology, and processes with different characteristics need to be jointly treated.
Under the new environment-friendly situation, new high-efficiency and energy-saving environment-friendly technologies are more and more favored by people, the traditional biological denitrification process is difficult to complete the deep removal of the landfill leachate at the late stage, and the additional organic carbon source can greatly increase the sewage treatment cost. Compared with other denitrification processes, the anaerobic ammonia oxidation denitrification process has good development potential. Because the anaerobic ammonium oxidation bacteria are autotrophic bacteria and the carbonate/carbon dioxide are inorganic carbon sources required by the growth of the anaerobic ammonium oxidation bacteria, the oxidation of ammonia nitrogen does not need the participation of molecular oxygen, and meanwhile, the reduction of nitrite nitrogen does not need organic carbon sources, so that the operation cost of biological denitrification of the landfill leachate is greatly reduced. The integrated process of the shortcut nitrification coupled with the anaerobic ammonia oxidation is the most effective process for realizing deep denitrification on the high ammonia nitrogen wastewater, and based on the anaerobic ammonia oxidation technology, the operation cost of a sewage treatment plant can be reduced under the condition of not adding any chemical medicine, and meanwhile, the high-efficiency removal of nitrogen can be realized. However, since the anaerobic ammonium oxidation bacteria have a long doubling time and a low proliferation efficiency, and in the process of coupling with the shortcut nitrification, a low amount of dissolved oxygen is generally used in order to adapt to the environment, the activity of the shortcut nitrification cannot be sufficiently exhibited, and further the function of the anaerobic ammonium oxidation bacteria is affected.
Therefore, an economical and efficient method is sought, and the method can provide a good living environment for anaerobic ammonia oxidation and simultaneously furthest exert the activity of short-cut nitrification, so that the problem to be solved is urgent at present.
Disclosure of Invention
The invention aims to solve the technical problems and provides a device and a method for strengthening the deep denitrification of landfill leachate by short-cut nitrification coupling anaerobic ammonia oxidation based on high dissolved oxygen operation and rotating biological filler carrier, which are used for carrying biological fillers, domesticating anaerobic ammonia oxidation bacteria in the biological fillers, simultaneously operating under the condition of continuously improved dissolved oxygen to stimulate the growth of ammonia oxidation bacteria, and attaching to the surfaces of the fillers to form an aerobic biofilm under the capture of the rotating fillers, so that on one hand, the device can protect the anaerobic ammonia oxidation bacteria in the fillers to enable the anaerobic ammonia oxidation bacteria to tolerate higher dissolved oxygen, on the other hand, the activity of the ammonia oxidation bacteria can be fully exerted, the capability of short-cut nitrification for generating nitrite is improved, and the anaerobic ammonia oxidation reaction is promoted.
Firstly, feeding water into the integrated rotary drum filler SBR reactor, pumping a part of landfill leachate into the integrated rotary drum filler SBR reactor, then an aeration system is opened for aerobic aeration, a motor is started, a rotating filler frame loaded with sponge fillers starts to rotate slowly, in the long-term running process, the dissolved oxygen in the aeration process is continuously improved, the anaerobic ammonium oxidation bacteria can gradually grow in the filler, meanwhile, ammonia oxidizing bacteria are attached and grown on the surface layer of the sponge filler, the thickness of the attached ammonia oxidizing bacteria is gradually increased, dissolved oxygen can be consumed by an aerobic biological film dominated by the ammonia oxidizing bacteria when entering the sponge filler, and (3) performing a shortcut nitrification reaction in the biomembrane to convert ammonia nitrogen into nitrite nitrogen, wherein the ammonia nitrogen and the nitrite nitrogen can pass through the biomembrane formed by ammonia oxidizing bacteria and enter the sponge filler to perform an anaerobic ammonia oxidation reaction, so that generated nitrogen escapes, and finally, the economical and efficient device and method for autotrophic nitrogen removal of the landfill leachate are realized.
The purpose of the invention is realized by the following technical scheme:
the utility model provides a device of intensive shortcut nitrification coupling anaerobic ammonium oxidation is to landfill leachate degree of depth denitrogenation based on high dissolved oxygen operation which characterized in that: the device comprises a percolate raw water tank (1), an integrated rotary drum filler SBR reactor (8) and a water outlet tank (8). A temperature control heating device (3) is arranged in the middle of the raw percolate tank (1), the raw percolate tank (1) is communicated with a first peristaltic pump (4) and an integrated SBR reactor (8) through a water inlet pipe (6), and the integrated SBR reactor (8) is communicated with a second peristaltic pump (14) and a water outlet tank (12) through a water outlet pipe (15);
3 sampling monitoring valves (9) are arranged on the integrated rotating drum filler SBR reactor (8) from top to bottom, a water inlet control valve (2) is arranged on the water inlet pipe (6), and a water outlet control valve (13) and a second peristaltic pump (14) are arranged on the water outlet pipe (15); a rotary filler frame (7), a DO probe (21), an ORP probe (17) and a pH probe (16) are arranged in the integrated rotating drum filler SBR reactor (8). The surface of the rotary filling frame (7) is hollow, sponge filling (23) is loaded, and the motor (26) drives the filling frame shaft (24) to rotate together with the rotary filling frame (7). Wherein the DO probe (21), the ORP probe (17) and the pH probe (16) are respectively connected with a DO meter (5), an ORP meter (11) and a pH meter (10) host through connecting wires. The bottom of the integrated drum filler SBR reactor (8) is provided with a microporous aeration head (18) and an aeration pump (19), the microporous aeration head (18) is connected with the aeration pump (19) through an aeration pipe (20), and the aeration pipe (20) is provided with a gas flowmeter (22).
A method for deep denitrification of landfill leachate based on high dissolved oxygen operation and rotating biological filler carrier reinforced partial nitrification coupled anaerobic ammonia oxidation is characterized by comprising the following steps:
feeding water into the integrated drum filler SBR reactor: starting an integrated SBR reactor (8), injecting actual urban landfill leachate serving as a stock solution into a leachate stock tank (1), opening a water inlet control valve (2), and pumping the landfill leachate into the integrated rotary drum filler SBR reactor (8) by the leachate stock tank (1) through a first water inlet pipe (6) and a first peristaltic pump (2);
high oxygen aeration of an integrated rotating drum filler SBR reactor: then starting an aeration system consisting of a microporous aeration head (18), an aeration pump (19) and an aeration pipe (16) to carry out aerobic nitrification on the landfill leachate flowing into the integrated SBR reactor (8), wherein the reactor is started and operated, the average dissolved oxygen concentration is maintained at 0.5mg/L through monitoring of a real-time control device, aeration is continuously carried out, the pH value is maintained within the range of 7.5-8.0 through a pH monitoring device, and NaHCO is added if the pH value is too high or too low3The pH value is maintained in the range, and the water feeding NH of the SBR reactor (8) with the integrated rotary drum filler is maintained4 +N load of 0.4 to 1.2kgNH4 +-N/(m3D) by maintaining the pH and NH4 +The N loading is in the above range so that the average free ammonia FA concentration in the integrated SBR reactor (8) is in the range of 12.0 to 18.0 mg/L. The integrated SBR reactor (8) is operated under the above conditions to carry out the aerobic stage reaction. Stopping aeration at the 'ammonia valley point', namely before the inflection point of pH falling and rising in the nitration process; and after the total nitrogen of the running effluent is less than 40mg/L, continuously increasing the running dissolved oxygen by taking 0.5mg/L as an average gradient, wherein the effect of the reactor fluctuates after the dissolved oxygen is increased each time, and when the total nitrogen of the running effluent is less than 40mg/L again, the dissolved oxygen can be increased again according to the gradient, and finally the running dissolved oxygen is maintained within the range of 4.5-5.0 mg/L.
And (3) precipitation and drainage of the integrated SBR reactor: and after the aerobic aeration is finished, the sedimentation is carried out for 0.5 hour to fully separate mud from water, after the sedimentation is finished, the sedimentation is carried out for draining water, a second peristaltic pump (14) and a drain valve (13) are opened, and the supernatant is drained, wherein the drainage ratio is 40%.
Advantages of the invention
The invention relates to a device and a method for deep denitrification of landfill leachate based on high dissolved oxygen operation and rotating biological filler carrier reinforced partial nitrification coupled anaerobic ammonia oxidation, which have the following innovation points:
1) according to the invention, the sponge filler is loaded into the rotary filler frame, so that the biological filler can be fully contacted with sewage, the aerobic biomembrane hanging process is promoted, meanwhile, the retention time of anaerobic ammonium oxidation bacteria can be prolonged, a good anaerobic environment is provided, the growth and the propagation of the anaerobic ammonium oxidation bacteria are facilitated, the deep denitrification of the late landfill leachate in the true sense is realized, and the effects of saving cost, deep denitrification and sludge reduction are achieved;
2) the problem of growth of anaerobic ammonium oxidation bacteria in a high dissolved oxygen environment is solved, an aerobic biomembrane attached and grown outside a biological filler can perform a shortcut nitrification reaction, the dissolved oxygen in the environment is consumed in time, the internal anaerobic ammonium oxidation bacteria are protected, the anaerobic ammonium oxidation reaction is promoted, the two reactions can simultaneously play the maximum activity in the same reactor, the process flow is simple, and the operation is convenient;
3) by monitoring ORP, pH and DO on line, the process of the shortcut nitrification process and the anaerobic ammonia oxidation process is mastered, and the aerobic aeration time is controlled in real time by using a process control method, so that the aim of saving energy is fulfilled;
4) the sponge filler has the advantages of large specific surface area, light weight and the like, the relatively large specific surface area provides a larger attachment space for ammonia oxidizing bacteria, the anaerobic ammonia oxidation reaction is promoted to be carried out, the denitrification efficiency is improved, and the sponge filler is convenient to replace and low in manufacturing cost;
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
The attached figure 1 of the specification is a structural schematic diagram of a system for realizing deep denitrification of landfill leachate generated by garbage classification based on a rotary filler frame loaded with biological fillers.
The figures in the drawings represent the following devices: 1-raw water tank of percolate; 2-water inlet control valve; 3-temperature control heating device; 4-a first peristaltic pump; 5-DO instrument; 6-water inlet pipe; 7-rotating the packing frame; 8-an integrated drum packing SBR reactor; 9-a sampling valve; 10-pH meter; 11-ORP meter; 12-a water outlet tank; 13-water outlet control valve; 14-a second peristaltic pump; 15-water outlet pipe; 16-pH probe; 17-ORP probe; 18-a microporous aeration head; 19-an aeration pump; 20-an aerator pipe; 21-DO probe; 22-a gas flow meter; 23-sponge filler; 24-a stuffing frame shaft; 25-a motor;
Detailed Description
The denitrification system and the operation method related to the invention are further described by combining the attached drawings in the specification:
as shown in the attached drawings of the specification, the device for deep denitrification of landfill leachate based on high dissolved oxygen operation and rotating biological filler carrier reinforced partial nitrification coupled anaerobic ammonia oxidation is characterized in that: the device comprises a percolate raw water tank (1), an integrated rotary drum filler SBR reactor (8) and a water outlet tank (8). A temperature control heating device (3) is arranged in the middle of the raw percolate tank (1), the raw percolate tank (1) is communicated with a first peristaltic pump (4) and an integrated SBR reactor (8) through a water inlet pipe (6), and the integrated SBR reactor (8) is communicated with a second peristaltic pump (14) and a water outlet tank (12) through a water outlet pipe (15);
3 sampling monitoring valves (9) are arranged on the integrated rotating drum filler SBR reactor (8) from top to bottom, a water inlet control valve (2) is arranged on the water inlet pipe (6), and a water outlet control valve (13) and a second peristaltic pump (14) are arranged on the water outlet pipe (15); a rotary filler frame (7), a DO probe (21), an ORP probe (17) and a pH probe (16) are arranged in the integrated rotating drum filler SBR reactor (8). The surface of the rotary filling frame (7) is hollow, sponge filling (23) is loaded, and the motor (26) drives the filling frame shaft (24) to rotate together with the rotary filling frame (7). Wherein the DO probe (21), the ORP probe (17) and the pH probe (16) are respectively connected with a DO meter (5), an ORP meter (11) and a pH meter (10) host through connecting wires. The bottom of the integrated drum filler SBR reactor (8) is provided with a microporous aeration head (18) and an aeration pump (19), the microporous aeration head (18) is connected with the aeration pump (19) through an aeration pipe (20), and the aeration pipe (20) is provided with a gas flowmeter (22).
A method for deep denitrification of landfill leachate based on high dissolved oxygen operation and rotating biological filler carrier reinforced partial nitrification coupled anaerobic ammonia oxidation is characterized by comprising the following steps:
feeding water into the integrated drum filler SBR reactor: starting an integrated SBR reactor (8), injecting actual urban landfill leachate serving as a stock solution into a leachate stock tank (1), opening a water inlet control valve (2), and pumping the landfill leachate into the integrated rotary drum filler SBR reactor (8) by the leachate stock tank (1) through a first water inlet pipe (6) and a first peristaltic pump (2);
high oxygen aeration of an integrated rotating drum filler SBR reactor: then starting an aeration system consisting of a microporous aeration head (18), an aeration pump (19) and an aeration pipe (16) to carry out aerobic nitrification on the landfill leachate flowing into the integrated SBR reactor (8), wherein the reactor is started and operated, the average dissolved oxygen concentration is maintained at 0.5mg/L through monitoring of a real-time control device, aeration is continuously carried out, the pH value is maintained within the range of 7.5-8.0 through a pH monitoring device, and NaHCO is added if the pH value is too high or too low3The pH value is maintained in the range, and the water feeding NH of the SBR reactor (8) with the integrated rotary drum filler is maintained4 +N load of 0.4 to 1.2kgNH4 +-N/(m3D) by maintaining the pH and NH4 +The N loading is in the above range so that the average free ammonia FA concentration in the integrated SBR reactor (8) is in the range of 12.0 to 18.0 mg/L. The integrated SBR reactor (8) is operated under the above conditions to carry out the aerobic stage reaction. Stopping aeration at the 'ammonia valley point', namely before the inflection point of pH falling and rising in the nitration process; after the total nitrogen of the running effluent is less than 40mg/L, the running dissolved oxygen is continuously increased by taking 0.5mg/L as an average gradient, the running effect of the reactor fluctuates after the dissolved oxygen is increased each time, when the total nitrogen of the running effluent is less than 40mg/L again, the dissolved oxygen can be increased again according to the gradient, and finally the running dissolved oxygen is maintained within the range of 4.5-5.0mg/L, so that the high-efficiency denitrification is realized.
And (3) precipitation and drainage of the integrated SBR reactor: and after the aerobic aeration is finished, the sedimentation is carried out for 0.5 hour to fully separate mud from water, after the sedimentation is finished, the sedimentation is carried out for draining water, a second peristaltic pump (14) and a drain valve (13) are opened, and the supernatant is drained, wherein the drainage ratio is 40%.
Within the range of the average ammonia nitrogen concentration of the influent landfill leachate being 1500-2200mg/L, COD/NH4 +-N is in the range of 1.4-2.0, and the results of the test for stable operation show that: the total nitrogen of the effluent of the system is less than 30mg/L, the TN removal rate is more than 90 percent, and the hydraulic power is stoppedCompared with the traditional process, the retention time can be shortened to 3 days, which is one fifth of the actual retention time, and the purpose of deep and efficient deep denitrification of the landfill leachate is realized.
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 intensive shortcut nitrification coupling anaerobic ammonium oxidation is to landfill leachate degree of depth denitrogenation based on high dissolved oxygen operation which characterized in that: the device comprises a percolate raw water tank (1), an integrated rotary drum filler SBR reactor (8) and a water outlet tank (8); a temperature control heating device (3) is arranged in the middle of the raw percolate tank (1), the raw percolate tank (1) is communicated with a first peristaltic pump (4) and an integrated SBR reactor (8) through a water inlet pipe (6), and the integrated SBR reactor (8) is communicated with a second peristaltic pump (14) and a water outlet tank (12) through a water outlet pipe (15);
3 sampling monitoring valves (9) are arranged on the integrated rotating drum filler SBR reactor (8) from top to bottom, a water inlet control valve (2) is arranged on the water inlet pipe (6), and a water outlet control valve (13) and a second peristaltic pump (14) are arranged on the water outlet pipe (15); a rotary filler frame (7), a DO probe (21), an ORP probe (17) and a pH probe (16) are arranged in the integrated rotating drum filler SBR reactor (8); the surface of the rotary filling frame (7) is hollow, sponge filling (23) is loaded, and a motor (26) drives a filling frame shaft (24) to rotate together with the rotary filling frame (7); wherein the DO probe (21), the ORP probe (17) and the pH probe (16) are respectively connected with a host of the DO meter (5), the ORP meter (11) and the pH meter (10) through connecting wires; the bottom of the integrated drum filler SBR reactor (8) is provided with a microporous aeration head (18) and an aeration pump (19), the microporous aeration head (18) is connected with the aeration pump (19) through an aeration pipe (20), and the aeration pipe (20) is provided with a gas flowmeter (22).
2. Method for applying the device according to claim 1, characterized in that it comprises the following steps:
feeding water into the integrated drum filler SBR reactor: starting an integrated SBR reactor (8), injecting actual urban landfill leachate serving as a stock solution into a leachate stock tank (1), opening a water inlet control valve (2), and pumping the landfill leachate into the integrated rotary drum filler SBR reactor (8) by the leachate stock tank (1) through a first water inlet pipe (6) and a first peristaltic pump (2);
high oxygen aeration of an integrated rotating drum filler SBR reactor: then starting an aeration system consisting of a microporous aeration head (18), an aeration pump (19) and an aeration pipe (16) to carry out aerobic nitrification on the landfill leachate flowing into the integrated SBR reactor (8), wherein the reactor is started and operated, the average dissolved oxygen concentration is maintained at 0.5mg/L through monitoring of a real-time control device, aeration is continuously carried out, the pH value is maintained within the range of 7.5-8.0 through a pH monitoring device, and NaHCO is added if the pH value is too high or too low3The pH value is maintained in the range, and the water feeding NH of the SBR reactor (8) with the integrated rotary drum filler is maintained4 +N load of 0.4 to 1.2kgNH4 +-N/(m3D) by maintaining the pH and NH4 +-N loading in the above range to give an average free ammonia FA concentration in the integrated SBR reactor (8) in the range of 12.0-18.0 mg/L; operating the integrated SBR reactor (8) under the conditions to carry out aerobic stage reaction; stopping aeration at the 'ammonia valley point', namely before the inflection point of pH falling and rising in the nitration process; after the total nitrogen of the running effluent is less than 40mg/L, continuously increasing the running dissolved oxygen by taking 0.5mg/L as an average gradient, wherein the running effect of the reactor fluctuates after the dissolved oxygen is increased each time, when the total nitrogen of the running effluent is less than 40mg/L again, the dissolved oxygen can be increased again according to the gradient, and finally the running dissolved oxygen is maintained within the range of 4.5-5.0 mg/L;
and (3) precipitation and drainage of the integrated SBR reactor: and after the aerobic aeration is finished, the sedimentation is carried out for 0.5 hour to fully separate mud from water, after the sedimentation is finished, the sedimentation is carried out for draining water, a second peristaltic pump (14) and a drain valve (13) are opened, and the supernatant is drained, wherein the drainage ratio is 40%.
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Cited By (2)
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|---|---|---|---|---|
| CN114314835A (en) * | 2021-12-31 | 2022-04-12 | 佛山市绿能环保有限公司 | Short-cut nitrification and denitrification coupling anaerobic ammonia oxidation denitrification reactor and integrated equipment |
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| CN116925889A (en) * | 2023-09-18 | 2023-10-24 | 中国市政工程西南设计研究总院有限公司 | Nitrifying bacteria enrichment culture device and sewage treatment device and method |
| CN116925889B (en) * | 2023-09-18 | 2024-02-02 | 中国市政工程西南设计研究总院有限公司 | Sewage treatment device and method |
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