CN105565493A - Device and method for advanced denitrification of early landfill leachate through synchronous nitrification/denitrification treatment - Google Patents
Device and method for advanced denitrification of early landfill leachate through synchronous nitrification/denitrification treatment Download PDFInfo
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- CN105565493A CN105565493A CN201510921452.8A CN201510921452A CN105565493A CN 105565493 A CN105565493 A CN 105565493A CN 201510921452 A CN201510921452 A CN 201510921452A CN 105565493 A CN105565493 A CN 105565493A
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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
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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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/16—Total nitrogen (tkN-N)
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Abstract
The invention discloses a device for advanced denitrification of early landfill leachate through synchronous nitrification/ denitrification treatment and a method for the advanced denitrification of the early landfill leachate through the synchronous nitrification/denitrification treatment. The device comprises a landfill leachate storage tank and a sequencing batch reactor, wherein one side of the landfill leachate storage tank is provided with a water inlet pipe; the other side of the landfill leachate storage tank is provided with an overflow pipe and a drainage pipe; the water inlet pipe is connected with the sequencing batch reactor through a water inlet peristaltic pump. The device and the method disclosed by the invention have the advantages that easily biodegradable VAFs (Volatile Fatty Acid) in inlet water are converted into intracellular PHAs (Polyhydroxyalkanoate) with a slow biodegradation rate by utilization of rich denitrified GAOs (glycogen accumulating organisms) in an anaerobic phase, and the intracellular PHAs are taken as a carbon source for the synchronous nitrification/denitrification treatment in an aerobic phase, so that organic substances and TN (Total Nitrogen) in the landfill leachate are efficiently removed without an external carbon source, therefore the input of a large quantity of carbon sources is reduced, the operation manner is simple, and the operation cost is greatly reduced.
Description
Technical field
The invention belongs to technical field of sewage, particularly relate to the biological denitrificaion process of percolate, specifically the device and method of the early stage landfill leachate depth denitrification of a kind of synchronous nitration and denitrification process.
Background technology
China is within the quite a long time from now on, and sanitary landfill also will become the main methods of China's process municipal wastes.To stack and in landfill process at municipal wastes, the pollutent contained by rubbish along with organic substance decomposing produce water-soluble go out, together form percolate with the free-water in rubbish, precipitation and the underground water etc. that infiltrates.Percolate has the features such as ammonia-nitrogen content is high, organic concentration is high, pollutant kind is various, nutritive element is out of proportion, serious threat surrounding environment safety.2008, China promulgated stricter percolate emission standard, has higher requirement, to percolate process especially in TN removal.
In general, labile organic compound concentration is higher, phosphorus content is very low for early stage percolate (the garbage loading embeading time is less than 5 years), and COD/TN generally can higher than 8, and wherein voltaile fatty acid (VFAs) is organic main component.The denitrogenation of traditional biological method " nitrated/denitrification " treating refuse percolate has the drawbacks such as energy consumption is high, carbon source dosage is large.In the last few years, synchronous nitration and denitrification (SND) technology more and more received publicity, and this technology can simplify the design of reaction tank, reduce the volume of reaction tank.In order to reach better synchronous nitration denitrification denitrogenation effect, need to keep close ammonia oxidation speed rate and denitrification rate, carbon source, dissolved oxygen etc. are the important factors realizing synchronous nitration and denitrification.Current research shows, in the early stage landfill leachate depth denitrification process of process, by the change of operation scheme, the control of operating parameter, the carbon source that can realize solvability easily to degrade is converted into the slow born of the same parents' internal carbon source of degraded, and can realize efficient synchronous nitration denitrification denitrogenation under micro-aerobic condition.
Summary of the invention
The object of the invention is to the defect overcoming prior art existence, the device and method of the early stage landfill leachate depth denitrification of a kind of synchronous nitration and denitrification process is provided.
Object of the present invention can be achieved through the following technical solutions:
The device of the early stage landfill leachate depth denitrification of a kind of synchronous nitration and denitrification process, it is characterized in that, described device comprises percolate and stores water tank and sequencing batch reactor, the side that described percolate stores water tank is provided with water inlet pipe, the opposite side that described percolate stores water tank is provided with upflow tube and evacuated tube, and described water inlet pipe connects sequencing batch reactor by water inlet peristaltic pump.
As preferred further, agitator is set in sequencing batch reactor of the present invention for stirring in reactor, dissolved oxygen meter, pH determinator, oxidation reduction potential determination instrument are set, be respectively used to the dissolved oxygen value, pH value, the redox potential value that measure muddy water mixed solution in sequencing batch reactor, the top of described sequencing batch reactor arranges thief hole, water discharge valve, the bottom of described sequencing batch reactor is provided with aeration head, and described aeration head is connected by gas meter with air compressor machine.
The present invention also discloses a kind of method applying said apparatus, comprises the following steps:
System starts: get mud in refuse landfill in percolate to sequencing batch reactor, and sludge concentration keeps 5000-6000mg/L; Coupling device, adopt " anaerobic-aerobic-anoxic " operation scheme, each cycle comprises: water inlet 5min, anaerobism stir 120min, aerobic aeration, anoxia stirring 30min, precipitation 30min, draining 5min; Each cycle water inlet ratio, draining ratio are 10%, aerobic stage dissolved oxygen controls at 0.4-0.6mg/L, the aeration end time controls to differentiate that nitrated terminal stops air compressor pump aeration according to DO, pH change curve of dissolved oxygen meter, the display of pH determinator in real time, and anoxic phases adds 3-4g sodium acetate and removes system nitric nitrogen, nitrite nitrogen as denitrifying carbon source; Sludge age controls at 20-30d;
System cloud gray model: percolate is stored water tank and is connected with sequencing batch reactor, early stage percolate enters percolate and stores water tank, enter in sequencing batch reactor by water inlet peristaltic pump, agitator starts anaerobism and stirs 120min, and the voltaile fatty acid VFAs of ready biodegradability in percolate is converted into poly-beta-hydroxy-alkanoate PHAs in the slow born of the same parents of thing degradation rate by denitrification fusca xylanase;
After anaerobic stages terminates, air compressor machine is opened, tolerance is regulated to carry out aerobic aeration by gas meter, aerobic aeration stage dissolved oxygen controls at 0.4-0.6mg/L, ammonia nitrogen degradation in mixed solution is nitrite nitrogen by nitrifier slowly, nitric nitrogen, meanwhile, denitrification fusca xylanase carries out the removal of nitrogen in denitrification process with degrade carbon source that slow organism is synchronous nitration and denitrification of intracellular PHA s and solvability, the aeration end time is according to dissolved oxygen meter, the DO of pH determinator display, pH change curve controls to differentiate that nitrated terminal stops air compressor machine aeration in real time, precipitation 30min, draining 5min, water inlet ratio, draining ratio is 10%, sludge age is 20-30d.
As preferred further, the method of the nitrated terminal of differentiation of the present invention, stopping air compressor machine aeration is: when the aerated reaction time is more than 0.5h, when in pH change curve, the first order derivative dpH/dt of pH sports positive number by negative, and DO concentration is suddenlyd change to more than 1.5mg/L by 0.5mg/L.。
As preferred further, anaerobism agitation phases of the present invention: oxidation reduction potential determination instrument measures redox potential value <-150mV, the concentration < 10mg/L of nitric nitrogen, nitrite nitrogen.
As preferred further, the carbon-nitrogen ratio COD/TN of early stage percolate of the present invention is 8-10.
Beneficial effect of the present invention: anaerobic stages of the present invention utilizes the denitrification fusca xylanase of enrichment that the voltaile fatty acid VFAs of ready biodegradability in water inlet is converted into poly-beta-hydroxy-alkanoate PHAs in the slow born of the same parents of thing degradation rate, and as the carbon source of synchronous nitration and denitrification in aerobic stage, realize the efficient removal without organism in percolate under additional carbon and TN, decrease adding of a large amount of carbon source, operation scheme is simple, greatly reduces running cost.
Accompanying drawing explanation
Fig. 1 is the structural representation of the device of the early stage landfill leachate depth denitrification of a kind of synchronous nitration and denitrification of the present invention process.
In figure: 1-percolate stores water tank, 11-water inlet pipe, 12-upflow tube, 13-evacuated tube, 2-sequencing batch reactor, 21-is intake peristaltic pump, 22-agitator, 23-is dissolved in determinator, 24-pH determinator, 25-oxidation reduction potential determination instrument, 26-aeration head, 27-gas meter, 28-air compressor machine, 29-thief hole, 210-water discharge valve.。
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
As shown in Figure 1.A device for the early stage landfill leachate depth denitrification of synchronous nitration and denitrification process, comprises percolate and stores water tank 1, sequencing batch reactor 2; The side that percolate stores water tank 1 is provided with water inlet pipe 11, and opposite side is provided with upflow tube 12 and evacuated tube 13, and water inlet pipe 11 connects sequencing batch reactor 2 by water inlet peristaltic pump 21; Agitator 22, dissolved oxygen meter 23, pH determinator 24, oxidation reduction potential determination instrument 25 are set in sequencing batch reactor 2, be respectively used to the dissolved oxygen value, pH value, the redox potential value that measure muddy water mixed solution in sequencing batch reactor 2, the top of sequencing batch reactor 2 arranges thief hole 29, water discharge valve 210, the bottom of described sequencing batch reactor 2 is provided with aeration head 26, and described aeration head 26 is connected by gas meter 27 with air compressor machine 28.
The percolate produced using certain refuse landfill is as former water, concrete water quality is as follows: the sewage of process is typical early stage percolate, and COD is 7381-12062mg/L, and ammonia nitrogen concentration is 717.9-1190.7mg/L, total nitrogen TN concentration is that 886.4-1389.7mg/L, COD/TN reach 8-10.As shown in Figure 1, sbr reactor device adopts synthetic glass to make to testing apparatus, and sbr reactor device useful volume is 10L.
Carrying out practically operation is as follows:
System start-up phase:
The mud getting Biological Treatment of Landfill Leachate in refuse landfill, in sequencing batch reactor 2, makes the sludge concentration in sequencing batch reactor 2 remain on 5500mg/L.
The percolate water inlet stored in water tank 1 is the early stage percolate after tap water dilution different multiples, starting first 10 days influent ammonium concentrations controls at 150-200mg/L, by reducing extension rate gradually, improve ammonia nitrogen concentration gradually until water inlet is former early stage percolate.
Adopt " anaerobic-aerobic-anoxic " operation scheme, each cycle comprises: water inlet 5min, anaerobism stir 120min, aerobic aeration (controlling in real time), anoxia stirring 30min, precipitation 30min, draining 5min; Anaerobism agitation phases: oxidation reduction potential determination instrument 25 measures redox potential value <-150mV, the concentration < 10mg/L of nitric nitrogen, nitrite nitrogen, each cycle water inlet ratio, draining ratio are 10%, aerobic stage dissolved oxygen controls at 0.4-0.6mg/L, aeration end time method of discrimination is: when the aerated reaction time is more than 0.5h, when in pH change curve, the first order derivative dpH/dt of pH sports positive number by negative, and DO concentration is suddenlyd change to more than 1.5mg/L by 0.5mg/L., stop air compressor machine 28 aeration, anoxic phases adds 3-4g sodium acetate and removes system nitric nitrogen, nitrite nitrogen as denitrifying carbon source; Sludge age controls at 20-30d.
When water inlet is the early stage percolate of not diluted, within certain reaction time, aerobic aeration terminate rear nitric nitrogen, nitrite nitrogen concentration lower than 10mg/L, system has started, and does not need to add carbon source.
The system cloud gray model stage:
Percolate is stored water tank 1 to be connected with sequencing batch reactor 2, early stage percolate enters percolate and stores water tank 1, enter in sequencing batch reactor 2 by water inlet peristaltic pump 21, agitator 22 starts anaerobism and stirs 120min, the voltaile fatty acid VFAs of ready biodegradability in percolate is converted into poly-beta-hydroxy-alkanoate PHAs in the slow born of the same parents of thing degradation rate by denitrification fusca xylanase, anaerobism agitation phases: oxidation reduction potential determination instrument 25 measures redox potential value <-150mV, nitric nitrogen, the concentration < 10mg/L of nitrite nitrogen,
After anaerobic stages terminates, air compressor machine 28 is opened, tolerance is regulated to carry out aerobic aeration by gas meter 27, aerobic aeration stage dissolved oxygen controls at 0.4-0.6mg/L, ammonia nitrogen degradation in mixed solution is nitrite nitrogen by nitrifier slowly, nitric nitrogen, meanwhile, denitrification fusca xylanase carries out the removal of nitrogen in denitrification process with degrade carbon source that slow organism is synchronous nitration and denitrification of intracellular PHA s and solvability, aeration end time method of discrimination is: when the aerated reaction time is more than 0.5h, when in pH change curve, the first order derivative dpH/dt of pH sports positive number by negative, and dissolved oxygen concentration is suddenlyd change to > 1.5mg/L by 0.5mg/L, stop air compressor machine 28 aeration, precipitation 30min, draining 5min, water inlet ratio, draining ratio is 10%, sludge age is 20-30d.
Test-results shows: steady running is issued to the synchronous removal of good organism, nitrogen, and TN clearance is 96.17 ± 0.51%, and water outlet TN concentration is 42.98 ± 4.89mg/L, and effluent COD concentration is 784.84 ± 63.00mg/L.
Above the device and method of the early stage landfill leachate depth denitrification of a kind of synchronous nitration and denitrification process provided by the present invention is described in detail, apply specific case herein to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (6)
1. the device of the early stage landfill leachate depth denitrification of synchronous nitration and denitrification process, it is characterized in that, described device comprises percolate and stores water tank (1) and sequencing batch reactor (2), the side that described percolate stores water tank (1) is provided with water inlet pipe (11), the opposite side that described percolate stores water tank (1) is provided with upflow tube (12) and evacuated tube (13), and described water inlet pipe (11) connects sequencing batch reactor (2) by water inlet peristaltic pump (21).
2. the device of the early stage landfill leachate depth denitrification of synchronous nitration and denitrification process according to claim 1, it is characterized in that, agitator (22) is set in described sequencing batch reactor (2) for stirring in reactor, dissolved oxygen meter (23) is set, pH determinator (24), oxidation reduction potential determination instrument (25), be respectively used to the dissolved oxygen value measuring sequencing batch reactor (2) interior muddy water mixed solution, pH value, redox potential value, the top of described sequencing batch reactor (2) arranges thief hole (29), water discharge valve (210), the bottom of described sequencing batch reactor (2) is provided with aeration head (26), described aeration head (26) is connected by gas meter (27) with air compressor machine (28).
3. application rights requires the method for any one of 1-2 device, it is characterized in that, comprises the following steps:
System starts: get mud in refuse landfill in percolate to sequencing batch reactor (2), and sludge concentration keeps 5000-6000mg/L; Coupling device, adopt " anaerobic-aerobic-anoxic " operation scheme, each cycle comprises: water inlet 5min, anaerobism stir 120min, aerobic aeration, anoxia stirring 30min, precipitation 30min, draining 5min; Each cycle water inlet ratio, draining ratio are 10%, aerobic stage dissolved oxygen controls at 0.4-0.6mg/L, the aeration end time controls to differentiate that nitrated terminal stops air compressor pump (28) aeration according to DO, pH change curve that dissolved oxygen meter (23), pH determinator (24) show in real time, and anoxic phases adds 3-4g sodium acetate and removes system nitric nitrogen, nitrite nitrogen as denitrifying carbon source; Sludge age controls at 20-30d;
System cloud gray model: percolate is stored water tank (1) and be connected with sequencing batch reactor (2), early stage percolate enters percolate and stores water tank (1), enter in sequencing batch reactor (2) by water inlet peristaltic pump (21), agitator (22) starts anaerobism and stirs 120min, and the voltaile fatty acid VFAs of ready biodegradability in percolate is converted into poly-beta-hydroxy-alkanoate PHAs in the slow born of the same parents of thing degradation rate by denitrification fusca xylanase;
After anaerobic stages terminates, air compressor machine (28) is opened, tolerance is regulated to carry out aerobic aeration by gas meter (27), aerobic aeration stage dissolved oxygen controls at 0.4-0.6mg/L, ammonia nitrogen degradation in mixed solution is nitrite nitrogen by nitrifier slowly, nitric nitrogen, meanwhile, denitrification fusca xylanase carries out the removal of nitrogen in denitrification process with degrade carbon source that slow organism is synchronous nitration and denitrification of intracellular PHA s and solvability, the aeration end time is according to dissolved oxygen meter (23), the DO that pH determinator (24) shows, pH change curve controls to differentiate that nitrated terminal stops air compressor machine (28) aeration in real time, precipitation 30min, draining 5min, water inlet ratio, draining ratio is 10%, sludge age is 20-30d.
4. method according to claim 3, it is characterized in that, the method of the nitrated terminal of described differentiation, stopping air compressor machine (28) aeration is: when the aerated reaction time is more than 0.5h, when in pH change curve, the first order derivative dpH/dt of pH sports positive number by negative, and DO concentration is suddenlyd change to more than 1.5mg/L by 0.5mg/L.
5. method according to claim 3, it is characterized in that, described anaerobism agitation phases: oxidation reduction potential determination instrument (25) measures redox potential value <-150mV, the concentration < 10mg/L of nitric nitrogen, nitrite nitrogen.
6. method according to claim 3, is characterized in that, the carbon-nitrogen ratio COD/TN of described early stage percolate is 8-10.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109467188A (en) * | 2018-12-12 | 2019-03-15 | 山东建筑大学 | DND dynamic nitration denitrification landfill leachate depth denitrification system and technique |
| CN110790378A (en) * | 2019-11-28 | 2020-02-14 | 恩格拜（武汉）生态科技有限公司 | Method for treating high-solid-content organic wastewater by anaerobic-aerobic deep coupling |
| CN116718742A (en) * | 2023-05-06 | 2023-09-08 | 四川文韬工程技术有限公司 | Water quality component analysis method for areas without sewage plants |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109467188A (en) * | 2018-12-12 | 2019-03-15 | 山东建筑大学 | DND dynamic nitration denitrification landfill leachate depth denitrification system and technique |
| CN110790378A (en) * | 2019-11-28 | 2020-02-14 | 恩格拜（武汉）生态科技有限公司 | Method for treating high-solid-content organic wastewater by anaerobic-aerobic deep coupling |
| CN110790378B (en) * | 2019-11-28 | 2022-04-19 | 恩格拜（武汉）生态科技有限公司 | Method for treating high-solid-content organic wastewater by anaerobic-aerobic deep coupling |
| CN116718742A (en) * | 2023-05-06 | 2023-09-08 | 四川文韬工程技术有限公司 | Water quality component analysis method for areas without sewage plants |
| CN116718742B (en) * | 2023-05-06 | 2024-05-24 | 四川文韬工程技术有限公司 | Water quality component analysis method for areas without sewage plants |
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