CN105540846A - Low-carbon-source municipal sewage improved UCT autotrophic denitrification dephosphorization device and application method thereof - Google Patents
Low-carbon-source municipal sewage improved UCT autotrophic denitrification dephosphorization device and application method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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- 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
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract
The invention relates to a low-carbon-source municipal sewage improved UCT autotrophic denitrification dephosphorization device and an application method thereof, belonging to the technical field of sewage biological treatment. The device aims to solve the problems of high energy consumption, high carbon discharge amount and low economy. The device comprises a municipal sewage raw water tank, an anaerobic reactor, an anoxic reactor, a primary short-range nitration reactor, a primary anaerobic ammoxidation reactor, a secondary short-range nitration reactor, a secondary anaerobic ammoxidation reactor, a precipitation tank and a water outlet pipe. The method comprises the following steps: 1. separate culture stage; 2. starting stage; and 3. continuous operation. The device comprehensively utilizes the three functional bacteria for denitrification dephosphorization, short-range nitrification and anaerobic ammoxidation, and establishes a municipal sewage continuous-flow autotrophic denitrification technique. The device ensures the high efficiency and stability of the denitrification and dephosphorization of the system. The device saves the organic carbon source and aeration quantity, reduces the surplus sludge discharge amount, lowers the operation energy consumption and cost, and lowers the greenhouse gas discharge.
Description
Technical field
The invention belongs to technical field of biological sewage treatment, be specifically related to the synchronous denitrification and dephosphorization method of a kind of Continuous Flow denitrification dephosphorization and short distance nitration Anammox technical finesse low carbon source urban sewage,
Background technology
Global warming and environmental pollution are the much-talked-about topics that the current world is concerned about.For biological sewage treatment, discharge while causing body eutrophication preventing nitrogen phosphorus, how energy efficient and reduce greenhouse gases arranged into the key issue that industry development is badly in need of solving.Traditional bio-denitrifying sewage technique, the technique mostly based on aerobic nitrification and heterotrophic denitrification exploitation (typically represents as A/O, A
2/ O technique).In aerobic nitrification process, sufficient aeration is needed to ensure ammonia oxidation bacteria (AOB, Ammoniaoxidationbacteria) and the normal growth metabolism of nitrosification oxidation bacteria (NOB, Nitriteoxidationbacteria), to realize ammonia nitrogen (NH
4 +) to nitrite nitrogen (NO
2 -) and nitric nitrogen (NO
3 -) conversion; In denitrification process, for realizing efficient denitrification, usually need to add a large amount of outer carbon sources (as methyl alcohol) to realize NO
3 -and NO
2 -to nitrogen (N
2) conversion.Visible, in traditional biological denitrification process, need the energy and the carbon source of at substantial.In addition, in the process of aerobic nitrification and heterotrophic denitrification, because unfavourable condition is (as low dissolved axygen (DO), NO
2 -accumulation, low C/N than) induction, can obvious release strong greenhouse gas N
2o.It is reported, N
2the Greenhouse effect of O compare CO
2strong 200 ~ 300 times, N in past 20 years global tropospheric
2the concentration of O increases with the speed of annual 0.25%.Therefore, the dirty water living creature processing technique towards energy-saving and emission-reduction (refer in particular to save aeration consumption, reduce greenhouse gases release) will comply with the development of industry, becomes the technique of main flow of new generation.
The discovery of Anammox (Anaerobicammoniumoxidation, Anammox), makes less energy-consumption, sustainable sewage disposal technology becomes possibility.Anammox autotrophic denitrification technique needs the NH of part
4 +be oxidized to NO
2 -, the NO then obtained
2 -reoxidize the NH of remainder
4 +, finally reach the object of denitrogenation.The O of 0.8mol only need be consumed in this process
2; Only with CO
2as carbon source, without the need to organic consumption; Owing to being whole process autotrophic denitrification, so mud generation is low, the removal of 1mol ammonia nitrogen only generates 3g organism.By above analysis, can find out compared with traditional biological denitrification process, Anammox autotrophic denitrification technology can save the organic carbon source consumption of 100%, can save the aeration rate of 60%, thus reduces direct energy consumption and the working cost of technique; Sludge yield is few simultaneously, can reduce sludge disposal expense; In addition, anaerobic ammonia oxidizing bacteria using carbonic acid gas as carbon source, and does not have N in pathways metabolism
2the intermediate products such as O, therefore can reduce the discharge of greenhouse gases.Along with deepening continuously of studying biological denitrification phosphorous removal technique, it is found that some polyP bacteria can using nitrate or nitrite as electron acceptor(EA), carrying out denitrifyingly completing excessive suction phosphorus simultaneously, realize " carbon is dual-purpose ", thus the demand of biological carbon and phosphorous removal to organic carbon source can be reduced.Especially then the demand of denitrogenation dephosphorizing to organic carbon source can be saved further using nitrite as the denitrification dephosphorization of electron acceptor(EA), the energy consumption of denitrogenation dephosphorizing process can also be reduced simultaneously, and avoid organic existence to the restraining effect of anaerobic ammonia oxidizing bacteria.Therefore, realize short distance nitration/Anammox and denitrification dephosphorization simultaneously, former water carbon source can be made full use of, can also operation energy consumption be reduced simultaneously, reduce greenhouse gas emission, finally realize the object of low carbon source urban sewage high-efficient denitrification and dephosphorization.
Summary of the invention
The present invention seeks to realize effluent quality usual employing excess aeration up to standard, the excessive operation scheme adding carbon source to solve traditional cities sewage work, so cause, sewage disposal energy consumption is high, the problem of large, the uneconomical saving of carbon emission amount, and provides low carbon source urban sewage to improve UCT autotrophic denitrification dephosphorization apparatus and application method thereof.
Low carbon source urban sewage improvement UCT autotrophic denitrification dephosphorization apparatus of the present invention, it comprises the municipal effluent raw water box, anaerobic reactor, anoxic reacter, first paragraph short distance nitration reactor, first paragraph anaerobic ammonia oxidation reactor, second segment short distance nitration reactor, second segment anaerobic ammonia oxidation reactor, settling tank and the rising pipe that connect successively;
Connect with silicone tube between described each reactor, adopt the mode of run by gravity to carry out the flowing of sewage; Described municipal effluent raw water box arranges water inlet pipe, upflow tube and blow-down pipe; Intake pump is adopted to connect between described municipal effluent raw water box and anaerobic reactor; Described anaerobic reactor, anoxic reacter, first paragraph short distance nitration reactor, first paragraph anaerobic ammonia oxidation reactor, second segment short distance nitration reactor and second segment anaerobic ammonia oxidation reactor are equipped with agitator and thief hole; The bottom of first paragraph short distance nitration reactor and second segment short distance nitration reactor is equipped with aerating apparatus and DO sensor, aerating apparatus is communicated with glutinous sand lump aeration head by air robot under meter by air compressor, and DO sensor is connected with DO determinator by data line; The outside of first paragraph anaerobic ammonia oxidation reactor and second segment anaerobic ammonia oxidation reactor all arranges inner circulation of sludge pump, and inside all adopts sponge filler to fill; Be communicated with anoxic reacter with mud external reflux pump by returned sluge control valve bottom settling tank, excess sludge discharges system by excess sludge discharge control valve; The mud internal reflux pipeline of anoxic reacter arranges mud internal reflux pump be communicated with anaerobic reactor.
Anaerobic reactor in the present invention: municipal effluent enters anaerobic reactor by the suction function of intake pump and internal reflux mud simultaneously, mixes with the muddy water mixed solution in anaerobic reactor.Under anaerobic, polyP bacteria absorbs biodegradable organism in former water in a large number, and stores in vivo with the form of internal carbon source PHB, discharges a large amount of solvability orthophosphoric acid salt in water body simultaneously.
Anoxic reacter in the present invention: settling tank returned sluge enters anoxic reacter with the muddy water mixed solution of anaerobic reactor under the effect of mud external reflux pump simultaneously.A small amount of nitric nitrogen that heterotrophic denitrification bacterium utilizes remaining organism in sewage to be carried by returned sluge under the stirring action of agitator and nitrite nitrogen carry out anti-nitration reaction, simultaneously part denitrifying phosphorus removing bacteria with nitric nitrogen or nitrite nitrogen for electron acceptor(EA), complete denitrification dephosphorization reaction with the PHB be stored under anaerobic condition in cell paste for electron donor, realize the synchronous removal of nitrogen phosphorus.
First paragraph short distance nitration reactor in the present invention: the muddy water mixed solution water outlet of anoxic reacter directly enters first paragraph short distance nitration reactor.Under the effect of aeration, heterotrophic bacterium utilizes oxygen that remaining a small amount of organism is carried out oxygenolysis, and AOB is by the part NH in former water simultaneously
4 +be oxidized to NO
2 -, for the reaction of follow-up Anammox provides substrate, polyP bacteria (comprising Denitrifying Phosphate Accumulating Organisms) utilizes oxygen aerobic suction phosphorus reaction to occur for electron acceptor(EA).The size of aeration rate uses spinner-type flowmeter to regulate according to the water quality situation of running status and Inlet and outlet water, and the dissolved oxygen concentration controlled in reactor is 0.2 ~ 0.5mg/L, controls the NH in the water outlet of first paragraph short distance nitration reactor simultaneously
4 +concentration is greater than NO
2 -concentration, if NH
4 +concentration is lower than NO
2 -concentration, then reduce the hydraulic detention time of first paragraph aerobic zone.
First paragraph anaerobic ammonia oxidation reactor in the present invention: the muddy water mixed solution water outlet of first paragraph short distance nitration reactor directly enters first paragraph anaerobic ammonia oxidation reactor.Under the stirring action of agitator, on sponge filler, the anaerobic ammonia oxidizing bacteria of biofilm utilizes NH
4 +and NO
2 -generation Anammox reacts, and carries out denitrogenation.Open inner circulation of sludge pump and promote mixing of the inner mud of first paragraph anaerobic ammonia oxidation reactor.Detection reaction device water outlet NO
2 -concentration, if also containing NO in water outlet
2 -, then the hydraulic detention time of first paragraph anaerobic ammonia oxidation reactor is extended.
Second segment short distance nitration reactor in the present invention: function is with first paragraph short distance nitration reactor, and the muddy water mixed solution water outlet of the anaerobic ammonia oxidation reactor of first paragraph directly enters second segment short distance nitration reactor.Under the effect of aeration, AOB is by remaining NH
4 +partial oxidation is NO
2 -, there is half short distance nitration reactor, for second segment anaerobic ammonium oxidizing bacteria provides substrate.Dissolved oxygen concentration in same control reactor is 0.2 ~ 0.5mg/L, and controls the NH in the water outlet of second segment short distance nitration reactor
4 +concentration is greater than NO
2 -concentration, if NH
4 +concentration is lower than NO
2 -concentration, then reduce the hydraulic detention time of second segment aerobic zone.
Second segment anaerobic ammonia oxidation reactor in the present invention: function is with first paragraph anaerobic ammonia oxidation reactor.Under the effect of agitator and inner circulation of sludge pump, the anaerobic ammonium oxidizing bacteria on sponge filler utilizes remaining NH in former water
4 +and NO
2 -generation Anammox reacts.Monitoring reactor water outlet NH
4 +concentration and NO
2 -concentration, if also containing NO in water outlet
2 -, then the hydraulic detention time of second segment anaerobic ammonia oxidation reactor is extended, if also containing NH in water outlet
4 +, then the hydraulic detention time of short distance nitration reactor is extended.
Settling tank in the present invention: the muddy water mixed solution water outlet of second segment anaerobic ammonia oxidation reactor enters settling tank and carries out mud-water separation, supernatant liquor is arranged outward, sludge settling is at sludge bucket, returned sluge is back to anoxic reacter through mud external reflux pump, and excess sludge is outside excess sludge discharge control valve discharge system.
The application method of above-mentioned low carbon source urban sewage improvement UCT autotrophic denitrification dephosphorization apparatus, carries out according to the following steps:
One, the single culture stage:
The active sludge of inoculation municipal wastewater treatment plant second pond is in two SBR sequencing batch reactors, sludge concentration is made to be 2500 ~ 3500mg/L, and eluriate NOB (nitrite-oxidizing bacteria) fast in the mode controlled in real time, realize the short distance nitration of municipal effluent, after steady running 30d, enrichment obtains AOB (ammonia oxidizing bacteria);
Inoculate common except phosphorus sludge is in two SBR sequencing batch reactors, seed sludge concentration is 3000-4000mg/L, changes electron acceptor(EA) gradually and turns out the DPAOs (denitrifying phosphorus removing bacteria) that can adapt to higher FNA (free nitrous acid) concentration;
In two CSTR reactors run continuously, add sponge filler, then inoculate Anammox mud, enrichment culture reaches 0.2 ~ 0.5mm to biofilm thickness;
By the above-mentioned reactor being enriched to three bacterioids, combine according to the form of the multistage A/O technique of improvement UCT;
Two, unloading phase:
Municipal effluent in municipal effluent raw water box passes into anaerobic reactor through intake pump, the enriched substance of cultivation three bacterioid is worked in coordination with municipal effluent, controlling mud external reflux ratio is 50% ~ 150%, mud internal reflux ratio is 80% ~ 120%, in first paragraph short distance nitration reactor and second segment short distance nitration reactor, dissolved oxygen concentration is 0.2 ~ 0.5mg/L, water temperature is 30 ~ 35 DEG C, HRT (hydraulic detention time) is 8 ~ 16h, be 15 ~ 20d by discharge excess sludge Controlling System sludge age, when the nitrogen elimination capacity of system reaches 1.0mg/m
3during/d, then system starts successfully;
Three, run continuously:
When system starts successfully, adjustment lacks aerobic volumetric ratio, HRT and system sludge age, the stability of system short distance nitration is guaranteed with low DO concentration and the mode lacking aerobic alternate run, and then realize the autotrophic denitrification performance of system high efficiency, reach stable outlet effect, after realizing the operation of system long-term stability, the operating temperature of system can be reduced according to the mode of 35 DEG C → 30 DEG C → 25 DEG C → 20 DEG C → 15 DEG C → 10 DEG C gradually, realize the steady running of the low carbon source urban sewage improvement UCT autotrophic denitrification dephosphorization apparatus under low temperature.
The present invention adopts the mode that first enrichment culture recombinant is run continuously separately to carry out the startup that Continuous Flow improves UCT autotrophic denitrification dephosphorization process.After system starts, first low carbon source urban sewage enters anaerobic reactor, and under anaerobic, polyP bacteria utilizes the COD in water inlet complete the storage of PHB and release phosphorus; Then enter anoxic reacter, denitrifying phosphorus uptake reaction occurs, carries out the synchronous removal of nitrogen phosphorus; Then two sections of short distance nitration/anaerobic ammonia oxidation reactors are entered successively, controlling dissolved oxygen concentration in short distance nitration reactor is 0.2 ~ 0.5mg/L, with low dissolved axygen and the short distance nitration lacking the aerobic mode stable maintenance system replaced, for follow-up anaerobic ammonia oxidizing bacteria reaction provides the substrate needed for growth, realize the removal of sewage nitrogen in the mode of autotrophic denitrification simultaneously.The advantages such as the present invention has fully utilized denitrification dephosphorization, short distance nitration and Anammox three kinds of function bacteriums, establishes municipal effluent Continuous Flow autotrophic denitrification technique, has efficient stable, energy-saving and emission-reduction, and sludge yield is few.
Low carbon source urban sewage improvement UCT autotrophic denitrification dephosphorization apparatus of the present invention and application, compared with existing traditional biological denitrification dephosphorization technique, have following advantage:
(1) utilize denitrifying phosphorus removing bacteria and anaerobic ammonia oxidizing bacteria to carry out denitrogenation dephosphorizing, solve the problem of low carbon source urban sewage water-inlet carbon source deficiency, ensure that high efficiency and the stability of system denitrogenation dephosphorizing;
(2) organism in former water is mainly used in Denitrifying Phosphorus Removal, avoids the impact of organic existence on follow-up anaerobic ammonia oxidizing bacteria, also saves aeration energy consumption simultaneously;
(3) save organic carbon source and aeration rate, decrease the quantity discharged of excess sludge, reduce operation energy consumption expense.Anammox bacterium is autotrophic bacteria, with CO
2for inorganic carbon source, poor growth, and sludge yield is low, reduce the cost of sludge treatment, short distance nitration adopts the mode of low dissolved axygen to maintain simultaneously, and aeration energy consumption is saved greatly, the feature that denitrifying phosphorus removing bacteria has " carbon is dual-purpose ", possesses the effect of denitrogenation and dephosphorization simultaneously;
(4) outlet effect is stablized, and greenhouse gas emission is few.The present invention considers that autotrophic denitrification has certain nitrate products, utilizes denitrification dephosphorization to reduce total nitrogen in water body further, ensures that water outlet total nitrogen is up to standard, effect stability; Short distance nitration Anammox autotrophic denitrification take inorganic carbon as carbon source, simultaneously in anaerobic ammonia oxidizing bacteria metabolic process without N
2o generates, and therefore the greenhouse gas emission of this technique is few.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of low carbon source urban sewage improvement UCT autotrophic denitrification dephosphorization apparatus in the present invention, wherein 1 represents municipal effluent raw water box, 2 represent anaerobic reactor, 3 represent anoxic reacter, 4 represent first paragraph short distance nitration reactor, 5 represent first paragraph anaerobic ammonia oxidation reactor, 6 represent second segment short distance nitration reactor, 7 represent second segment anaerobic ammonia oxidation reactor, 8 represent settling tank, 9 indicate water pipe, 10 represent agitator, 11 represent intake pump, 12 represent mud internal reflux pump, 13 represent air compressor, 14 represent mud external reflux pump, 15 represent inner circulation of sludge pump, 16 represent glutinous sand lump aeration head, 17 represent air robot under meter, 18 represent returned sluge control valve, 19 represent excess sludge discharge control valve, 20 represent DO determinator, 21 represent DO sensor, 22 represent water inlet pipe, 23 represent upflow tube, 24 represent blow-down pipe, 25 represent thief hole, 26 represent sponge filler.
Embodiment
Technical solution of the present invention is not limited to following cited embodiment, also comprises the arbitrary combination between each embodiment.
Embodiment one: shown in composition graphs 1, present embodiment low carbon source urban sewage improvement UCT autotrophic denitrification dephosphorization apparatus, it comprises the municipal effluent raw water box 1, anaerobic reactor 2, anoxic reacter 3, first paragraph short distance nitration reactor 4, first paragraph anaerobic ammonia oxidation reactor 5, second segment short distance nitration reactor 6, second segment anaerobic ammonia oxidation reactor 7, settling tank 8 and the rising pipe 9 that connect successively;
Connect with silicone tube between described each reactor, adopt the mode of run by gravity to carry out the flowing of sewage; Described municipal effluent raw water box 1 is arranged water inlet pipe 22, upflow tube 23 and blow-down pipe 24; Intake pump 11 is adopted to connect between described municipal effluent raw water box 1 and anaerobic reactor 2; Described anaerobic reactor 2, anoxic reacter 3, first paragraph short distance nitration reactor 4, first paragraph anaerobic ammonia oxidation reactor 5, second segment short distance nitration reactor 6 and second segment anaerobic ammonia oxidation reactor 7 are equipped with agitator 10 and thief hole 25; The bottom of first paragraph short distance nitration reactor 4 and second segment short distance nitration reactor 6 is equipped with aerating apparatus and DO sensor 21, aerating apparatus is communicated with glutinous sand lump aeration head 16 by air robot under meter 17 by air compressor 13, and DO sensor 21 is connected with DO determinator 20 by data line; The outside of first paragraph anaerobic ammonia oxidation reactor 5 and second segment anaerobic ammonia oxidation reactor 7 all arranges inner circulation of sludge pump 15, and inside all adopts sponge filler 26 to fill; Be communicated with anoxic reacter 3 with mud external reflux pump 14 by returned sluge control valve 18 bottom settling tank 8, excess sludge discharges system by excess sludge discharge control valve 19; The mud internal reflux pipeline of anoxic reacter 3 arranges mud internal reflux pump 12 be communicated with anaerobic reactor 2.
Embodiment two: the application method of present embodiment low carbon source urban sewage improvement UCT autotrophic denitrification dephosphorization apparatus, carry out according to the following steps:
One, the single culture stage:
The active sludge of inoculation municipal wastewater treatment plant second pond is in two SBR sequencing batch reactors, make sludge concentration be 2500 ~ 3500mg/L, and eluriate NOB fast in the mode controlled in real time, realize the short distance nitration of municipal effluent, after steady running 30d, enrichment obtains AOB;
Inoculate the common phosphorus sludge that removes in two SBR sequencing batch reactors, seed sludge concentration is 3000 ~ 4000mg/L, changes electron acceptor(EA) gradually and turns out the DPAOs that can adapt to higher FNA concentration;
In two CSTR reactors run continuously, add sponge filler, then inoculate Anammox mud, enrichment culture reaches 0.2 ~ 0.5mm to biofilm thickness;
By the above-mentioned reactor being enriched to three bacterioids, combine according to the form of the multistage A/O technique of improvement UCT;
Two, unloading phase:
Municipal effluent in municipal effluent raw water box 1 passes into anaerobic reactor 2 through intake pump 11, the enriched substance of cultivation three bacterioid is worked in coordination with municipal effluent, controlling mud external reflux ratio is 50% ~ 150%, mud internal reflux ratio is 80% ~ 120%, in first paragraph short distance nitration reactor 4 and second segment short distance nitration reactor 6, dissolved oxygen concentration is 0.2 ~ 0.5mg/L, water temperature is 30 ~ 35 DEG C, HRT is 8 ~ 16h, be 15 ~ 20d by discharge excess sludge Controlling System sludge age, when the nitrogen elimination capacity of system reaches 1.0mg/m
3during/d, then system starts successfully;
Three, run continuously:
When system starts successfully, adjustment lacks aerobic volumetric ratio, HRT and system sludge age, the stability of system short distance nitration is guaranteed with low DO concentration and the mode lacking aerobic alternate run, and then realize the autotrophic denitrification performance of system high efficiency, reach stable outlet effect, after realizing the operation of system long-term stability, the operating temperature of system can be reduced according to the mode of 35 DEG C → 30 DEG C → 25 DEG C → 20 DEG C → 15 DEG C → 10 DEG C gradually, realize the steady running of the low carbon source urban sewage improvement UCT autotrophic denitrification dephosphorization apparatus under low temperature.
Embodiment three: present embodiment and embodiment two unlike, the active sludge inoculating municipal wastewater treatment plant second pond in step one, in two SBR sequencing batch reactors, makes sludge concentration be 3000mg/L.Other step and parameter identical with embodiment two.
Embodiment four: present embodiment and specific embodiment party two unlike, in step one, common dephosphorization sludge source is in municipal sewage plant of Gaobeidian City second pond.Other step and parameter identical with embodiment two.
Embodiment five: present embodiment and specific embodiment party two unlike, inoculate common except phosphorus sludge is in two SBR sequencing batch reactors in step one, seed sludge concentration is 3500mg/L.Other step and parameter identical with embodiment two.
Embodiment six: present embodiment and specific embodiment party two unlike, in step one, Anammox sludge source is in Beijing draining group sludge-digestion liquid Anammox demonstration project.Other step and parameter identical with embodiment two.
Embodiment seven: present embodiment and embodiment two unlike, changing the detailed process that electron acceptor(EA) turns out the DPAOs that can adapt to higher FNA concentration described in step one is gradually:
1, adopt and detest/aerobic operation scheme, carry out the enrichment culture of common polyP bacteria (PAOs), sludge age (SRT) controls at 10 ~ 15d;
2, adopt and detest/anoxic operation scheme, by anoxic phases nitrate nitrogen (NO
3 -), progressively aerobic suction phosphorus is changed into anoxic and inhale phosphorus, turn out with NO
3 -for the DPAOs of electron acceptor(EA), and progressively improve load, the enrichment of strengthening DPAOs;
3, reduce the dosage of the nitrate nitrogen of anoxic section gradually, improve nitrite dosage, enrichment culture goes out can with NO simultaneously
2 -for the Denitrifying Phosphate Accumulating Organisms of electron acceptor(EA), and progressively improve load, obtain the DPAOs that can adapt to higher FNA concentration.Other step and parameter identical with embodiment two.
Embodiment eight: present embodiment and embodiment two unlike, sponge filler described in step one is of a size of 2cm × 2cm × 2cm, and packing ratio is 30% ~ 50%.Other step and parameter identical with embodiment two.
Embodiment nine: present embodiment and embodiment two unlike, the detailed process that enrichment culture described in step one to biofilm thickness reaches 0.2 ~ 0.5mm is: adopt water distribution to cultivate, the abundance being enriched to Anammox bacterium is 10
10~ 10
12after copies/gMLVSS, then change water inlet into municipal effluent gradually, water temperature 30 ~ 35 DEG C, under the condition of flooding velocity 8 ~ 16L/h, enrichment culture reaches 0.2 ~ 0.5mm to biofilm thickness.Other step and parameter identical with embodiment two.
Embodiment ten: present embodiment and embodiment two unlike, the HRT described in step 2 is 8 ~ 16h, and concrete HRT will according to water outlet NH
4 +concentration and water outlet NO
2 -concentration regulates, as water outlet NH
4 +when concentration is 10mgN/L, control HRT is 12 ~ 16h, as water outlet NO
2 -when concentration is 10mgN/L, control HRT is 8 ~ 12h, as water outlet NH
4 +concentration and water outlet NO
2 -when concentration is all greater than 10mgN/L, whether the Anammox bacterium in check system is suppressed, and should stop continuous operation in time if be suppressed, and recovering step one is enrichment culture separately, as water outlet NH
4 +concentration and water outlet NO
2 -concentration equal less than 10mgN/L time, keeping system is run under current HRT.Other step and parameter identical with embodiment two.
Following examples are adopted to verify beneficial effect of the present invention:
Embodiment:
Shown in composition graphs 1, the application method of low carbon source urban sewage improvement UCT autotrophic denitrification dephosphorization apparatus, carries out according to the following steps:
One, the single culture stage:
The active sludge of inoculation municipal wastewater treatment plant second pond is in two SBR sequencing batch reactors, and make sludge concentration be 3000mg/L, and eluriate NOB fast in the mode controlled in real time, realize the short distance nitration of municipal effluent, after steady running 30d, enrichment obtains AOB;
Inoculate the common phosphorus sludge that removes in two SBR sequencing batch reactors, seed sludge concentration is 3000 ~ 4000mg/L, changes electron acceptor(EA) gradually and turns out the DPAOs that can adapt to higher FNA concentration;
In two CSTR reactors run continuously, add sponge filler, then inoculate Anammox mud, enrichment culture reaches 0.4mm to biofilm thickness;
By the above-mentioned reactor being enriched to three bacterioids, combine according to the form of the multistage A/O technique of improvement UCT;
Two, unloading phase:
Municipal effluent in municipal effluent raw water box 1 passes into anaerobic reactor 2 through intake pump 11, the enriched substance of cultivation three bacterioid is worked in coordination with municipal effluent, controlling mud external reflux ratio is 50% ~ 150%, mud internal reflux ratio is 80% ~ 120%, in first paragraph short distance nitration reactor 4 and second segment short distance nitration reactor 6, dissolved oxygen concentration is 0.2 ~ 0.5mg/L, water temperature is 30 ~ 35 DEG C, HRT is 8 ~ 16h, be 15 ~ 20d by discharge excess sludge Controlling System sludge age, when the nitrogen elimination capacity of system reaches 1.0mg/m
3during/d, then system starts successfully;
Three, run continuously:
When system starts successfully, adjustment lacks aerobic volumetric ratio, HRT and system sludge age, the stability of system short distance nitration is guaranteed with low DO concentration and the mode lacking aerobic alternate run, and then realize the autotrophic denitrification performance of system high efficiency, reach stable outlet effect, after realizing the operation of system long-term stability, the operating temperature of system can be reduced according to the mode of 35 DEG C → 30 DEG C → 25 DEG C → 20 DEG C → 15 DEG C → 10 DEG C gradually, realize the steady running of the low carbon source urban sewage improvement UCT autotrophic denitrification dephosphorization apparatus under low temperature.
In the present embodiment step one, common dephosphorization sludge source is in municipal sewage plant of Gaobeidian City second pond; In step one, Anammox sludge source is in Beijing draining group sludge-digestion liquid Anammox demonstration project.
Changing the detailed process that electron acceptor(EA) turns out the DPAOs that can adapt to higher FNA concentration described in the present embodiment step one is gradually:
1, adopt and detest/aerobic operation scheme, carry out the enrichment culture of common polyP bacteria, sludge age controls at 10 ~ 15d;
2, employing detests/anoxic operation scheme, by adding NO at anoxic phases
3 -, progressively aerobic suction phosphorus is changed into anoxic and inhales phosphorus, turn out with NO
3 -for the DPAOs of electron acceptor(EA), and progressively improve load, the enrichment of strengthening DPAOs;
3, reduce the dosage of the nitrate nitrogen of anoxic section gradually, improve nitrite dosage, enrichment culture goes out can with NO simultaneously
2 -for the Denitrifying Phosphate Accumulating Organisms of electron acceptor(EA), and progressively improve load, obtain the DPAOs that can adapt to higher FNA concentration.
Described in the present embodiment step one, sponge filler is of a size of 2cm × 2cm × 2cm, and packing ratio is 40%.
The detailed process that enrichment culture described in the present embodiment step one to biofilm thickness reaches 0.4mm is: adopt water distribution to cultivate, the abundance being enriched to Anammox bacterium is 10
10~ 10
12after copies/gMLVSS, then change water inlet into municipal effluent gradually, water temperature 32 DEG C, under the condition of flooding velocity 8 ~ 16L/h, enrichment culture reaches 0.4mm to biofilm thickness.
HRT described in the present embodiment step 2 is 8 ~ 16h, and concrete HRT will according to water outlet NH
4 +concentration and water outlet NO
2 -concentration regulates, as water outlet NH
4 +when concentration is 10mgN/L, control HRT is 12 ~ 16h, as water outlet NO
2 -when concentration is 10mgN/L, control HRT is 8 ~ 12h, as water outlet NH
4 +concentration and water outlet NO
2 -when concentration is all greater than 10mgN/L, whether the Anammox bacterium in check system is suppressed, and should stop continuous operation in time if be suppressed, and recovering step one is enrichment culture separately, as water outlet NH
4 +concentration and water outlet NO
2 -concentration equal less than 10mgN/L time, keeping system is run under current HRT.
The present embodiment adopts Beijing University of Technology's dependents' district sanitary sewage as former water, and concrete water quality is as follows: COD concentration is 133.98 ~ 266.01mg/L; NH
+ 4-N concentration is 42.01 ~ 68.56mg/L, NO
- 2-N concentration is 0.07 ~ 1.12mg/L, NO
- 3-N concentration is 0.00 ~ 1.05mg/L.Testing apparatus as shown in Figure 1, each reactor all adopts synthetic glass to make, and be the sbr reactor device that aspect ratio is 1.6 ~ 3.1, useful volume is 4 ~ 8L, aerobic volumetric ratio can be lacked according to system to adjust, settling tank adopts vertical sedimentation basin, and be made up of synthetic glass, top settling tank is cylindrical, sludge bucket is butt reverse taper, inclination angle is 60 °, and adopt center water inlet, periphery V-notch weir water-out manners, useful volume is 16L.
Test-results shows: after stable, and average effluent COD concentration is 45.34mg/L, average water outlet NH
+ 4-N concentration is 0.32mg/L, average water outlet NO
- 2-N concentration is 0.74mg/L, average water outlet NO
- 3-N concentration is 4.52mg/L, and average water outlet TN concentration is 6.43mg/L, average water outlet PO
4 3--P concentration is 0.10mg/L, and water outlet concentration of nitrogen and phosphorus all reaches the requirement of one-level emission standard A.
Claims (10)
1. low carbon source urban sewage improvement UCT autotrophic denitrification dephosphorization apparatus, is characterized in that it comprises municipal effluent raw water box (1), anaerobic reactor (2), anoxic reacter (3), first paragraph short distance nitration reactor (4), first paragraph anaerobic ammonia oxidation reactor (5), second segment short distance nitration reactor (6), second segment anaerobic ammonia oxidation reactor (7), settling tank (8) and the rising pipe (9) connected successively;
Connect with silicone tube between described each reactor, adopt the mode of run by gravity to carry out the flowing of sewage; Described municipal effluent raw water box (1) is arranged water inlet pipe (22), upflow tube (23) and blow-down pipe (24); Intake pump (11) is adopted to connect between described municipal effluent raw water box (1) and anaerobic reactor (2); Described anaerobic reactor (2), anoxic reacter (3), first paragraph short distance nitration reactor (4), first paragraph anaerobic ammonia oxidation reactor (5), second segment short distance nitration reactor (6) and second segment anaerobic ammonia oxidation reactor (7) are equipped with agitator (10) and thief hole (25); The bottom of first paragraph short distance nitration reactor (4) and second segment short distance nitration reactor (6) is equipped with aerating apparatus and DO sensor (21), aerating apparatus is communicated with glutinous sand lump aeration head (16) by air robot under meter (17) by air compressor (13), and DO sensor (21) is connected with DO determinator (20) by data line; The outside of first paragraph anaerobic ammonia oxidation reactor (5) and second segment anaerobic ammonia oxidation reactor (7) all arranges inner circulation of sludge pump (15), and inside all adopts sponge filler (26) to fill; Settling tank (8) bottom is communicated with anoxic reacter (3) with mud external reflux pump (14) by returned sluge control valve (18), and excess sludge discharges system by excess sludge discharge control valve (19); The mud internal reflux pipeline of anoxic reacter (3) arranges mud internal reflux pump (12) be communicated with anaerobic reactor (2).
2. low carbon source urban sewage improves the application method of UCT autotrophic denitrification dephosphorization apparatus as claimed in claim 1, it is characterized in that it carries out according to the following steps:
One, the single culture stage:
The active sludge of inoculation municipal wastewater treatment plant second pond is in two SBR sequencing batch reactors, and make sludge concentration be 2500 ~ 3500mg/L, and eluriate NOB fast in the mode controlled in real time, realize the short distance nitration of municipal effluent, steady running 30d, enrichment obtains AOB;
Inoculate the common phosphorus sludge that removes in two SBR sequencing batch reactors, seed sludge concentration is 3000 ~ 4000mg/L, changes electron acceptor(EA) gradually and turns out the DPAOs that can adapt to higher FNA concentration;
In two CSTR reactors run continuously, add sponge filler, then inoculate Anammox mud, enrichment culture reaches 0.2 ~ 0.5mm to biofilm thickness;
By the above-mentioned reactor being enriched to three bacterioids, combine according to the form of the multistage A/O technique of improvement UCT;
Two, unloading phase:
Municipal effluent in municipal effluent raw water box (1) passes into anaerobic reactor (2) through intake pump (11), the enriched substance of cultivation three bacterioid is worked in coordination with municipal effluent, controlling mud external reflux ratio is 50% ~ 150%, mud internal reflux ratio is 80% ~ 120%, first paragraph short distance nitration reactor (4) and second segment short distance nitration reactor (6) interior dissolved oxygen concentration are 0.2 ~ 0.5mg/L, water temperature is 30 ~ 35 DEG C, HRT is 8 ~ 16h, be 15 ~ 20d by discharge excess sludge Controlling System sludge age, when the nitrogen elimination capacity of system reaches 1.0mg/m
3during/d, then system starts successfully,
Three, run continuously:
When system starts successfully, adjustment lacks aerobic volumetric ratio, HRT and system sludge age, the stability of system short distance nitration is guaranteed with low DO concentration and the mode lacking aerobic alternate run, and then realize the autotrophic denitrification performance of system high efficiency, reach stable outlet effect, after realizing the operation of system long-term stability, the operating temperature of system can be reduced according to the mode of 35 DEG C → 30 DEG C → 25 DEG C → 20 DEG C → 15 DEG C → 10 DEG C gradually, realize the steady running of the low carbon source urban sewage improvement UCT autotrophic denitrification dephosphorization apparatus under low temperature.
3. the application method of low carbon source urban sewage improvement UCT autotrophic denitrification dephosphorization apparatus according to claim 2, it is characterized in that the active sludge inoculating municipal wastewater treatment plant second pond in step one is in two SBR sequencing batch reactors, make sludge concentration be 3000mg/L.
4. the application method of low carbon source urban sewage improvement UCT autotrophic denitrification dephosphorization apparatus according to claim 2, is characterized in that in step one, common dephosphorization sludge source is in municipal sewage plant of Gaobeidian City second pond.
5. the application method of low carbon source urban sewage improvement UCT autotrophic denitrification dephosphorization apparatus according to claim 2, it is characterized in that inoculating the common phosphorus sludge that removes in step one in two SBR sequencing batch reactors, seed sludge concentration is 3500mg/L.
6. the application method of low carbon source urban sewage improvement UCT autotrophic denitrification dephosphorization apparatus according to claim 2, is characterized in that in step one, Anammox sludge source is in Beijing draining group sludge-digestion liquid Anammox demonstration project.
7. the application method of low carbon source urban sewage according to claim 2 improvement UCT autotrophic denitrification dephosphorization apparatus, it is characterized in that changing gradually described in step one detailed process that electron acceptor(EA) turns out the DPAOs that can adapt to higher FNA concentration is:
1, adopt and detest/aerobic operation scheme, carry out the enrichment culture of common polyP bacteria, sludge age controls at 10 ~ 15d;
2 ,/anoxic operation scheme is detested in employing, by anoxic phases nitrate nitrogen, progressively aerobic suction phosphorus is changed into anoxic and inhales phosphorus, turn out with NO
3 -for the DPAOs of electron acceptor(EA), and progressively improve load, the enrichment of strengthening DPAOs;
3, reduce the dosage of the nitrate nitrogen of anoxic section gradually, improve nitrite dosage, enrichment culture goes out can with NO simultaneously
2 -for the Denitrifying Phosphate Accumulating Organisms of electron acceptor(EA), and progressively improve load, obtain the DPAOs that can adapt to higher FNA concentration.
8. the application method of low carbon source urban sewage improvement UCT autotrophic denitrification dephosphorization apparatus according to claim 2, it is characterized in that sponge filler described in step one is of a size of 2cm × 2cm × 2cm, packing ratio is 30% ~ 50%.
9. the application method of low carbon source urban sewage improvement UCT autotrophic denitrification dephosphorization apparatus according to claim 2, it is characterized in that the detailed process that enrichment culture described in step one to biofilm thickness reaches 0.2 ~ 0.5mm is: adopt water distribution to cultivate, the abundance being enriched to Anammox bacterium is 10
10~ 10
12after copies/gMLVSS, then change water inlet into municipal effluent gradually, water temperature 30 ~ 35 DEG C, under the condition of flooding velocity 8 ~ 16L/h, enrichment culture reaches 0.2 ~ 0.5mm to biofilm thickness.
10. the application method of low carbon source urban sewage improvement UCT autotrophic denitrification dephosphorization apparatus according to claim 2, it is characterized in that the HRT described in step 2 is 8 ~ 16h, concrete HRT will according to water outlet NH
4 +concentration and water outlet NO
2 -concentration regulates, as water outlet NH
4 +when concentration is 10mgN/L, control HRT is 12 ~ 16h, as water outlet NO
2 -when concentration is 10mgN/L, control HRT is 8 ~ 12h, as water outlet NH
4 +concentration and water outlet NO
2 -when concentration is all greater than 10mgN/L, whether the Anammox bacterium in check system is suppressed, and should stop continuous operation in time if be suppressed, and recovering step one is enrichment culture separately, as water outlet NH
4 +concentration and water outlet NO
2 -concentration equal less than 10mgN/L time, keeping system is run under current HRT.
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