CN109721157B - Device and method for treating late landfill leachate through shortcut nitrification/anaerobic ammonia oxidation/shortcut denitrification-anaerobic ammonia oxidation process - Google Patents
Device and method for treating late landfill leachate through shortcut nitrification/anaerobic ammonia oxidation/shortcut denitrification-anaerobic ammonia oxidation process Download PDFInfo
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Abstract
A device and a method for treating late landfill leachate by a shortcut nitrification/anaerobic ammonium oxidation/shortcut denitrification-anaerobic ammonium oxidation process belong to the field of biological treatment of high ammonia nitrogen sewage and sludge. The late landfill leachate firstly enters PN-SBR, and the ammonia nitrogen in the inflow water is completely oxidized into nitrite nitrogen; effluent containing nitrite nitrogen and a part of late landfill leachate enter AMX-SBR together for denitrification through anaerobic ammoxidation; the effluent of AMX-SBR containing nitrate nitrogen, the other part of late landfill leachate and an external carbon source are pumped into a DEAMOX-UASB reactor at the same time, the nitrate nitrogen is firstly reduced into nitrite nitrogen by short-range denitrifying bacteria, and further deep removal is completed through anaerobic ammonia oxidation; the invention provides a novel biological denitrification process, which solves the problems of low denitrification efficiency and high TN of effluent of late landfill leachate and reduces the consumption of an external carbon source; the process is flexible and changeable, is easy to regulate and control, and is suitable for deep removal of high ammonia nitrogen wastewater.
Description
Technical Field
The invention relates to a device and a method for treating late landfill leachate by a shortcut nitrification/anaerobic ammonia oxidation/shortcut denitrification-anaerobic ammonia oxidation process, belonging to the field of biological treatment of high ammonia nitrogen sewage and sludge.
Background
In recent years, with the increasing production of municipal solid waste, landfill has become the most widely used treatment and disposal method in the world. The leachate generated by landfill 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 microorganism nutrient elements and the like, so that the treatment of the leachate becomes one of the unsolved problems in the international range. NH is treated by the traditional biological denitrification process4 +Conversion of-N to NO3 -N, and NO by denitrification3 -N is converted to nitrogen which escapes from the water. Denitrification stage with NO3 -and-N is an electron acceptor, and the organic matter is used as an electron donor to convert ammonia nitrogen into nitrogen to complete biological denitrification. The serious shortage of organic carbon source is a barrier that the denitrification efficiency of the leachate at the late stage cannot be improved, so that the traditional biological denitrification efficiency is only improvedCan reach about 10 percent, and the added organic carbon source can greatly increase the cost of sewage denitrification.
The anaerobic ammonia oxidation technology belongs to an autotrophic nitrogen removal process, does not need an organic carbon source, has low sludge yield and does not need aeration, and is suitable for high ammonia nitrogen wastewater such as low C/N ratio late-stage landfill leachate and the like. But a great amount of nitrate nitrogen generated in the anaerobic ammonia oxidation process is the main reason for the substandard effluent. The problem of high nitrate nitrogen in the anaerobic ammonia oxidation effluent can be effectively solved in the short-cut denitrification process, the anaerobic ammonia oxidation and the short-cut denitrification can be simultaneously carried out in a single reactor, nitrate nitrogen generated by the anaerobic ammonia oxidation is reduced into nitrite nitrogen by short-cut denitrification bacteria, and the generated nitrite nitrogen is further removed by the anaerobic ammonia oxidation, so that the effluent TN concentration can be effectively reduced compared with that of the traditional anaerobic ammonia oxidation process.
The advanced landfill leachate with high ammonia nitrogen concentration realizes stable nitrite nitrogen accumulation in PN-SBR through a short-cut nitrification process, nitrite nitrogen in short-cut nitrification effluent and part of ammonia nitrogen in the advanced landfill leachate are removed in AMX-SBR through an anaerobic ammonia oxidation process, nitrate nitrogen generated in the anaerobic ammonia oxidation process is firstly reduced into nitrite nitrogen by short-cut denitrifying bacteria in DEAMOX-UASB, and the nitrite nitrogen is further removed through in-situ anaerobic ammonia oxidation.
Disclosure of Invention
The invention provides a device and a method for treating advanced landfill leachate by a shortcut nitrification/anaerobic ammonium oxidation/shortcut denitrification-anaerobic ammonium oxidation process, and particularly the advanced landfill leachate firstly enters PN-SBR, and all ammonia nitrogen in inflow water is oxidized into nitrite nitrogen; effluent containing nitrite nitrogen and a part of late landfill leachate enter AMX-SBR together for denitrification through anaerobic ammoxidation; the effluent of AMX-SBR containing nitrate nitrogen, the other part of late landfill leachate and an external carbon source are pumped into a DEAMOX-UASB reactor at the same time, the nitrate nitrogen is firstly reduced into nitrite nitrogen by short-range denitrifying bacteria, and then further deep removal is completed through anaerobic ammonia oxidation.
The purpose of the invention is realized by the following technical scheme:
the device for treating the late landfill leachate by the short-cut nitrification/anaerobic ammonia oxidation/short-cut denitrification-anaerobic ammonia oxidation process is characterized by comprising a raw water tank (1), a short-cut nitrification reactor (PN-SBR) (2), a first intermediate water tank (3), an anaerobic ammonia oxidation reactor (AMX-SBR) (4), a second intermediate water tank (5), an external carbon source storage tank (6.5) and a short-cut denitrification-anaerobic ammonia oxidation reactor (DEAMOX-UASB) (6);
the raw water tank is provided with a first water outlet (1.1) and a second water outlet (1.2); the PN-SBR is provided with an air compressor (2.1), a gas flow meter (2.2), an aeration sand head (2.9), a first water inlet (2.4), a first sampling port (2.7), a first water discharge port (2.8), a first stirrer (2.5), a first water inlet peristaltic pump (2.3), a pH/DO real-time monitoring device (2.6) and a first ORP real-time monitoring device (2.4); the AMX-SBR is provided with a second water inlet (4.2), a second sampling port (4.7), a second water outlet (4.8), a second water inlet peristaltic pump (4.3), a third water inlet peristaltic pump (4.1), a second stirrer (4.5), a pH real-time monitoring device (4.6) and a second ORP real-time monitoring device (4.4); the DEAMOX-UASB is provided with a vent pipe (6.8), a third water inlet (6.3), a fourth water inlet peristaltic pump (6.2), a fifth water inlet peristaltic pump (6.1), a first backflow port (6.10), a first backflow peristaltic pump (6.13), a second backflow port (6.12), a three-phase separator (6.14), an exhaust port (6.7), an air bag (6.6) and a third water outlet (6.9);
the raw water tank (1) is respectively connected with the PN-SBR (2), the AMX-SBR (4) and the DEAMOX-UASB (6) through a first water inlet peristaltic pump (2.3)/a third water inlet peristaltic pump (4.1)/a fifth water inlet peristaltic pump (6.1); a PN-SBR first water discharge port (2.8) is connected with a first intermediate water tank (3), and air is pumped into the PN-SBR (2) through an aeration sand head (2.9) finally through an air compressor (2.1) and a gas flow meter (2.2); the first intermediate water tank (3) is connected with a second water inlet (4.2) of the AMX-SBR through a second water inlet peristaltic pump (4.3); the AMX-SBR second water outlet (4.8) is connected with a water inlet (5.1) of the second intermediate water tank; a water outlet (5.2) of the second intermediate water tank is connected with a DEAMOX-UASB (6) through a fourth water inlet peristaltic pump (6.2); an external carbon source storage tank (6.5) is connected with DEAMOX-UASB (6); the DEAMOX-UASB first return port (6.10) is connected to the second return port (6.12) via a first peristaltic return pump (6.13).
Utilize the device to realize advanced denitrification of landfill leachate of late stage, its characterized in that, including the following process:
1) short-cut nitrification sludge, anaerobic ammonium oxidation sludge and short-cut denitrification anaerobic ammonium oxidation sludge are respectively added into PN-SBR, AMX-SBR and DEAMOX-UASB, and the sludge concentration of mixed liquor of each reactor after the addition is controlled to be 4035-4523mg/L, 4329-4638mg/L and 4362-5720mg/L respectively.
2) Pumping the late landfill leachate in the raw water tank into PN-SBR, opening a first stirrer and an air compressor, controlling the concentration of dissolved oxygen of the PN-SBR to be 0.2-0.5mg/L, consuming alkalinity in the short-cut nitrification process, when the pH value is reduced to the lowest value and the ammonia valley point after the reaction is finished, strictly controlling the aeration time through a pH/DO real-time monitoring device, stopping aeration when the ammonia valley point appears in a pH curve, closing the first stirrer and the air compressor, and discharging water after precipitating for 30 min.
3) And respectively opening a second water inlet peristaltic pump and a third water inlet peristaltic pump to simultaneously pump nitrite nitrogen-containing wastewater in the first intermediate water tank and late landfill leachate in the raw water tank into AMX-SBR. The anaerobic ammonia oxidation process is a process for generating alkalinity, pH continuously rises along with the reaction, after the anaerobic ammonia oxidation reaction is finished, an inflection point appears on a pH curve and stops increasing, the anoxic stirring time is strictly controlled by a pH real-time monitoring device, stirring is stopped when the inflection point appears on the pH curve, the second stirrer is closed, and after 30min of precipitation, supernate is discharged into a second middle water tank.
4) And respectively opening a fourth water inlet peristaltic pump and a fifth water inlet peristaltic pump to simultaneously pump nitrate nitrogen wastewater in the second intermediate water tank and late landfill leachate in the raw water tank into DEAMOX-UASB. And controlling the flow rates of the fourth and fifth water inlet peristaltic pumps to be 0.24L/h and 0.022L/h respectively, enabling DEAMOX-UASB wastewater to enter the second return port from the first return port through the first return peristaltic pump, and controlling the flow rate of the first return peristaltic pump to be 0.45L/h.
Principle of the technology
The device and the method for treating the late landfill leachate by the short-cut nitrification/anaerobic ammonia oxidation/short-cut denitrification-anaerobic ammonia oxidation process are characterized in that the late landfill leachate firstly enters PN-SBR, and all the inflow ammonia nitrogen is oxidized into nitrite nitrogen; effluent containing nitrite nitrogen and a part of late landfill leachate enter AMX-SBR together for denitrification through anaerobic ammoxidation; the effluent of AMX-SBR containing nitrate nitrogen, the other part of late landfill leachate and an external carbon source are pumped into a DEAMOX-UASB reactor at the same time, the nitrate nitrogen is firstly reduced into nitrite nitrogen by short-range denitrifying bacteria, and further deep removal is completed through anaerobic ammonia oxidation; the invention provides a novel biological denitrification process, which solves the problems of low denitrification efficiency and high TN of effluent of late landfill leachate and reduces the consumption of an external carbon source; the process is flexible and changeable, is easy to regulate and control, and is suitable for deep removal of high ammonia nitrogen wastewater.
The device and the method for treating the advanced landfill leachate by the shortcut nitrification/anaerobic ammonium oxidation/shortcut denitrification-anaerobic ammonium oxidation process have the following advantages that:
1) by organically combining short-cut nitrification, short-cut denitrification and anaerobic ammonia oxidation, the deep denitrification of the late-stage landfill leachate is really realized, and the purposes of saving carbon source addition and treatment cost are achieved;
2) the aeration time is controlled in real time through the pH curve to convert all the ammonia nitrogen in the inlet water into nitrite nitrogen, and the real-time control strategy can not only strictly control the nitrification in the short-cut nitrification stage, but also avoid NOB increase and energy waste caused by over-aeration;
3) the reaction time of the shortcut nitrification and the anaerobic ammonia oxidation is controlled in real time by adopting a pH curve, and when the water quality of the landfill leachate in the late stage of water inlet fluctuates, the system can still stably operate, so that the nitrogen in the system can be efficiently removed;
4) the process can reduce nitrate nitrogen generated by anaerobic ammonia oxidation and remove the nitrate nitrogen in situ, effectively improves the total nitrogen removal rate, and has high reaction rate of short-range denitrification and anaerobic ammonia oxidation and high nitrogen removal load;
5) the DEAMOX-UASB short-cut denitrification only reduces nitrate nitrogen to nitrite nitrogen, so that the consumption of carbon source is less, and the sludge yield is less than that of the traditional denitrification process, thereby reducing the energy consumption and cost of the subsequent sludge treatment.
Drawings
FIG. 1 is a schematic view of the apparatus of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The device for treating the late landfill leachate by the short-cut nitrification/anaerobic ammonia oxidation/short-cut denitrification-anaerobic ammonia oxidation process is characterized by comprising a raw water tank (1), a short-cut nitrification reactor (PN-SBR) (2), a first intermediate water tank (3), an anaerobic ammonia oxidation reactor (AMX-SBR) (4), a second intermediate water tank (5), an external carbon source storage tank (6.5) and a short-cut denitrification-anaerobic ammonia oxidation reactor (DEAMOX-UASB) (6);
the raw water tank is provided with a first water outlet (1.1) and a second water outlet (1.2); the PN-SBR is provided with an air compressor (2.1), a gas flow meter (2.2), an aeration sand head (2.9), a first water inlet (2.4), a first sampling port (2.7), a first water discharge port (2.8), a first stirrer (2.5), a first water inlet peristaltic pump (2.3), a pH/DO real-time monitoring device (2.6) and a first ORP real-time monitoring device (2.4); the AMX-SBR is provided with a second water inlet (4.2), a second sampling port (4.7), a second water outlet (4.8), a second water inlet peristaltic pump (4.3), a third water inlet peristaltic pump (4.1), a second stirrer (4.5), a pH real-time monitoring device (4.6) and a second ORP real-time monitoring device (4.4); the DEAMOX-UASB is provided with a vent pipe (6.8), a third water inlet (6.3), a fourth water inlet peristaltic pump (6.2), a fifth water inlet peristaltic pump (6.1), a first backflow port (6.10), a first backflow peristaltic pump (6.13), a second backflow port (6.12), a three-phase separator (6.14), an exhaust port (6.7), an air bag (6.6) and a third water outlet (6.9);
the raw water tank (1) is respectively connected with the PN-SBR (2), the AMX-SBR (4) and the DEAMOX-UASB (6) through a first water inlet peristaltic pump (2.3)/a third water inlet peristaltic pump (4.1)/a fifth water inlet peristaltic pump (6.1); a PN-SBR first water discharge port (2.8) is connected with a first intermediate water tank (3), and air is pumped into the PN-SBR (2) through an aeration sand head (2.9) finally through an air compressor (2.1) and a gas flow meter (2.2); the first intermediate water tank (3) is connected with a second water inlet (4.2) of the AMX-SBR through a second water inlet peristaltic pump (4.3); the AMX-SBR second water outlet (4.8) is connected with a water inlet (5.1) of the second intermediate water tank; a water outlet (5.2) of the second intermediate water tank is connected with a DEAMOX-UASB (6) through a fourth water inlet peristaltic pump (6.2); an external carbon source storage tank (6.5) is connected with DEAMOX-UASB (6); the DEAMOX-UASB first return port (6.10) is connected to the second return port (6.12) via a first peristaltic return pump (6.13).
The water used for the specific test of the embodiment is the actual late-stage landfill leachate, the average ammonia nitrogen concentration is 1736 +/-40 mg/L, the COD average concentration is 2109 +/-200 mg/L, and the average alkalinity is 4000 +/-1000 mg/L (as CaCO)3Meter). The PN-SBR test adopts sequencing batch SBR, the effective volume is 10L, and the water drainage ratio is 50%; the AMX-SBR adopts sequencing batch SBR with the effective volume of 10L and the water drainage ratio of 80 percent; the effective volume of the DEAMOX-UASB adopting an up-flow anaerobic sludge bed reactor (UASB) is 2L;
the specific operation process is as follows:
1) short-cut nitrification sludge, anaerobic ammonium oxidation sludge and short-cut denitrification anaerobic ammonium oxidation sludge are respectively added into PN-SBR, AMX-SBR and DEAMOX-UASB, and the sludge concentration of mixed liquor of each reactor after the addition is controlled to be 4035-4523mg/L, 4329-4638mg/L and 4362-5720mg/L respectively.
2) Pumping the late landfill leachate in the raw water tank into PN-SBR, opening a first stirrer and an air compressor, controlling the concentration of dissolved oxygen of the PN-SBR to be 0.2-0.5mg/L, consuming alkalinity in the short-cut nitrification process, when the pH value is reduced to the lowest value and the ammonia valley point after the reaction is finished, strictly controlling the aeration time through a pH/DO real-time monitoring device, stopping aeration when the ammonia valley point appears in a pH curve, closing the first stirrer and the air compressor, and discharging water after precipitating for 30 min.
3) And respectively opening a second water inlet peristaltic pump and a third water inlet peristaltic pump to simultaneously pump nitrite nitrogen-containing wastewater in the first intermediate water tank and late landfill leachate in the raw water tank into AMX-SBR. The anaerobic ammonia oxidation process is a process for generating alkalinity, pH continuously rises along with the reaction, after the anaerobic ammonia oxidation reaction is finished, an inflection point appears on a pH curve and stops increasing, the anoxic stirring time is strictly controlled by a pH real-time monitoring device, stirring is stopped when the inflection point appears on the pH curve, the second stirrer is closed, and after 30min of precipitation, supernate is discharged into a second middle water tank.
4) And respectively opening a fourth water inlet peristaltic pump and a fifth water inlet peristaltic pump to simultaneously pump nitrate nitrogen wastewater in the second intermediate water tank and late landfill leachate in the raw water tank into DEAMOX-UASB. And controlling the flow rates of the fourth and fifth water inlet peristaltic pumps to be 0.24L/h and 0.022L/h respectively, enabling DEAMOX-UASB wastewater to enter the second return port from the first return port through the first return peristaltic pump, and controlling the flow rate of the first return peristaltic pump to be 0.45L/h.
The continuous test results show that:
the process has total nitrogen removal rate and total nitrogen removal rate of 99.5% and 0.43kg/m under the conditions that the concentrations of ammonia nitrogen, total nitrogen and COD in the inlet water are 1736 +/-40 mg/L, 2023 +/-75 mg/L and 2109 +/-200 mg/L respectively3d. Water outlet TN<10mg/L, and reaches the landfill leachate discharge standard.
Claims (1)
1. The method for realizing advanced denitrification of the landfill leachate by utilizing the short-cut nitrification/anaerobic ammonia oxidation/short-cut denitrification-anaerobic ammonia oxidation device comprises a raw water tank (1), a short-cut nitrification reactor PN-SBR (2), a first intermediate water tank (3), an anaerobic ammonia oxidation reactor AMX-SBR (4), a second intermediate water tank (5), an external carbon source storage tank (6.5) and a short-cut denitrification-anaerobic ammonia oxidation reactor DEAMOX-UASB (6);
the raw water tank is provided with a first water outlet (1.1) and a second water outlet (1.2); the PN-SBR is provided with an air compressor (2.1), a gas flow meter (2.2), an aeration sand head (2.9), a first water inlet (2.4), a first sampling port (2.7), a first water discharge port (2.8), a first stirrer (2.5), a first water inlet peristaltic pump (2.3), a pH/DO real-time monitoring device (2.6) and a first ORP real-time monitoring device (2.10); the AMX-SBR is provided with a second water inlet (4.2), a second sampling port (4.7), a second water outlet (4.8), a second water inlet peristaltic pump (4.3), a third water inlet peristaltic pump (4.1), a second stirrer (4.5), a pH real-time monitoring device (4.6) and a second ORP real-time monitoring device (4.4); the DEAMOX-UASB is provided with a vent pipe (6.8), a third water inlet (6.3), a fourth water inlet peristaltic pump (6.2), a fifth water inlet peristaltic pump (6.1), a first backflow port (6.10), a first backflow peristaltic pump (6.13), a second backflow port (6.12), a three-phase separator (6.14), an exhaust port (6.7), an air bag (6.6) and a third water outlet (6.9);
the raw water tank (1) is respectively connected with the PN-SBR (2), the AMX-SBR (4) and the DEAMOX-UASB (6) through a first water inlet peristaltic pump (2.3), a third water inlet peristaltic pump (4.1) and a fifth water inlet peristaltic pump (6.1); a PN-SBR first water discharge port (2.8) is connected with a first intermediate water tank (3), and air is pumped into the PN-SBR (2) through an aeration sand head (2.9) finally through an air compressor (2.1) and a gas flow meter (2.2); the first intermediate water tank (3) is connected with a second water inlet (4.2) of the AMX-SBR through a second water inlet peristaltic pump (4.3); the AMX-SBR second water outlet (4.8) is connected with a water inlet (5.1) of the second intermediate water tank; a water outlet (5.2) of the second intermediate water tank is connected with a DEAMOX-UASB (6) through a fourth water inlet peristaltic pump (6.2); an external carbon source storage tank (6.5) is connected with DEAMOX-UASB (6); the DEAMOX-UASB first reflux port (6.10) is connected with the second reflux port (6.12) through a first reflux peristaltic pump (6.13);
characterized in that the method comprises the following steps:
1) respectively adding the shortcut nitrification sludge, the anaerobic ammonium oxidation sludge and the shortcut denitrification anaerobic ammonium oxidation sludge to PN-SBR, AMX-SBR and DEAMOX-UASB, and controlling the sludge concentration of mixed liquor of each reactor after the addition to be 4035-4523mg/L, 4329-4638mg/L and 4362-5720mg/L respectively;
2) pumping the late landfill leachate in a raw water tank into PN-SBR, opening a first stirrer and an air compressor, controlling the concentration of dissolved oxygen of the PN-SBR to be 0.2-0.5mg/L, consuming alkalinity in the short-cut nitrification process, lowering the pH to the lowest value after the reaction is finished, namely the ammonia valley point, strictly controlling the aeration time through a pH/DO real-time monitoring device, stopping aeration when the pH curve has the ammonia valley point, closing the first stirrer and the air compressor, and draining water after settling for 30 min;
3) respectively opening a second water inlet peristaltic pump and a third water inlet peristaltic pump to simultaneously pump nitrite nitrogen-containing wastewater in the first intermediate water tank and late landfill leachate in the raw water tank into AMX-SBR; the anaerobic ammonia oxidation process is a process for generating alkalinity, the pH value continuously rises along with the reaction, after the anaerobic ammonia oxidation reaction is finished, the pH curve has an inflection point and stops increasing, the anoxic stirring time is strictly controlled by a pH real-time monitoring device, when the pH curve has the inflection point, the stirring is stopped, the second stirrer is closed, and after the precipitation is carried out for 30min, the supernatant is discharged into a second intermediate water tank;
4) respectively opening a fourth water inlet peristaltic pump and a fifth water inlet peristaltic pump to simultaneously pump nitrate nitrogen-containing wastewater in the second intermediate water tank and late landfill leachate in the raw water tank into DEAMOX-UASB; and controlling the flow rates of the fourth water inlet peristaltic pump and the fifth water inlet peristaltic pump to be 0.24L/h and 0.022L/h respectively, enabling DEAMOX-UASB wastewater to enter the second return port from the first return port through the first return peristaltic pump, and controlling the flow rate of the first return peristaltic pump to be 0.45L/h.
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| CN110451644A (en) * | 2019-09-11 | 2019-11-15 | 山东北成环境工程有限公司 | Landfill leachate Anammox advanced nitrogen combined treatment device and technique |
| CN111484136B (en) * | 2020-05-18 | 2021-12-07 | 北京工业大学 | Energy-saving sewage treatment system and process with high effluent standard |
| CN111747525A (en) * | 2020-06-24 | 2020-10-09 | 盐城工学院 | Split-point water inlet-splicing biological membrane modular efficient denitrification process |
| CN113003725A (en) * | 2021-02-20 | 2021-06-22 | 北京工业大学 | Device and method for promoting quality improvement and efficiency improvement of sewage plant based on DEAMOX and sludge fermentation coupling technology |
| CN114380389B (en) * | 2022-01-11 | 2023-08-11 | 中国建筑设计研究院有限公司 | Device and method for treating rural sewage with ultralow energy consumption |
| CN115432806A (en) * | 2022-09-15 | 2022-12-06 | 北京工业大学 | Process for combined treatment of landfill leachate and municipal sewage by synchronous biological phosphorus removal through shortcut nitrification, anaerobic ammonia oxidation coupling and denitrification |
| CN115417501B (en) * | 2022-09-30 | 2023-12-12 | 北京城市排水集团有限责任公司 | Up-flow type expanded sludge bed process system and method for treating aquaculture wastewater |
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