CN101723512A - Ammonia-contained waste water high-efficiency biochemical processing method - Google Patents
Ammonia-contained waste water high-efficiency biochemical processing method Download PDFInfo
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Abstract
The invention relates to an ammonia-contained waste water high-efficiency biochemical processing method which comprises the following steps of: firstly putting an inoculant into a bioreactor for extensive culture, wherein the inoculant is a microbial flora of Nitrosomonas sp., Denitrobacter sp., Rhodanobacter sp. and the like, and high ammonia nitrogen and high pH value are used as the conditions of the extensive culture; throwing the microbial flora after the extensive culture or a mixture of the microbial flora and aerobic activated sludge of a sewage plant into a nitration reaction pond to process high-ammonia nitrogen low-COD waste water. The processing method has nonstrict requirements for a temperature range and dissolved oxygen concentration. The method not only has the advantages of energy consumption reduction, carbon source saving, sludge production capacity decrease and the like, but also has the characteristics of high volume loading of ammonia nitrogen removal, good processing effect, strong impact resistant capability, stable system operation and the like and is a processing method with stronger synthesis.
Description
Technical field
The invention belongs to technical field of sewage, relate in particular to a kind of treatment process of ammonia-containing water, this method can realize refining oil and Catalyst Production in the processing of the low COD concentration waste water of high ammonia concentration that produces in ammonia-containing water, particularly the Catalyst Production process of discharging.
Background technology
In recent years, along with development of industry and agriculture, to trade effluent (as refinery water, containing wastewater from catalyst, synthetic ammonia waste water), the emission limit set of diffusion water of garbage burying ground and sanitary sewage is more and more stricter, sewage disposal technology more and more comes into one's own, and particularly the qualified discharge of ammonia-containing water becomes the processing difficult problem in environmental protection field.Though the ammonia nitrogen in the waste water can adopt physico-chemical processes such as stripping stripping, ion-exchange, chemical oxidation to handle, there are problems such as by product secondary pollution and processing efficiency be low in these methods.By contrast, biological process is the better method of control water body ammonia and nitrogen pollution.
Traditional biochemical processing method is usually with oil removing and COD (chemical oxygen demand, the index of carbon source content in the expression waste water) be main, in the biotic population based on the microorganism species of the decarburization status of having the advantage, microorganism species based on denitrogenation is not optimized because being subjected to enough attention, therefore removes the limited in one's ability of ammonia nitrogen.The ammonia-containing water that produces of processes such as the catalyzer of some petrochemical industry, synthetic ammonia particularly, the ammonia nitrogen concentration rangeability in the waste water is bigger.For dense ammonia-containing water, particularly less when the water yield, water quality is under alkalescence or the neutrallty condition, can adopt the gas stripping process of technology maturation to handle, and the stripping after still handling is purified waste water and still contained a certain amount of ammonia nitrogen usually, and major part can not directly be discharged; Can adopt traditional biological process or mixes the back with other waste water and discharge for the ammonia-containing water that wastewater flow rate is big, ammonia content is low; It is relatively poor to handle economy for the waste water (about ammonia nitrogen 1500mg/L) of middle and high concentration with gas stripping process, because do not have carbon source or carbon source deficiency in this waste water, can not reach good effect again with traditional biological process simultaneously.
CN 1331053A discloses a kind of ammonia-containing water and has handled and recovery method, be rare ammonia-containing water at first to be carried out reverse osmosis concentration handle, concentrated solution and catalyzer are that the dense ammonia-containing water in producing mixes and carries out the stripping processing again after plus-minus is regulated pH, though the inventive method can be handled the ammonia-containing water that the concentration that produces in the Catalyst Production technology is lower than 1500mg/L, compare problems such as having complicated operation, facility investment and process cost height with biological process.
Biological ammonia nitrogen removal technology is carried out a large amount of research both at home and abroad in recent years.The Mulder of Holland etc. (N-removal by SHARON[A] .IAWQ conference[C], 1997.30-31) utilize nitrated supernatant liquor of mud and the contour ammonia waste water of rubbish filtrate in the short distance nitration Process for Treating Municipal second-stage treatment system, can make the accumulation rate of nitrite anions reach 100%.Wastewater treatment is the result show: when influent ammonia nitrogen was 1000mg/L, still up to more than the 100mg/L, clearance was up to 90% to the water outlet ammonia nitrogen.Someone handles high ammonia-containing water to the nitrosation-anaerobic ammoxidation process integration and studies (Liao Dexiang etc., environmental science, 2006,27 (9): 1776-1780), the result shows, when the hydraulic detention time of nitrosation reaction device is controlled at 1d, influent ammonium concentration 400～600mg/L, water outlet nitrous acid nitrogen concentration is 260～280mg/L, when influent ammonium concentration is 480mg/L, the ratio of nitrite nitrogen/ammonia nitrogen is about 1.2 in the water outlet, and the nitrogen material clearance that enters anaerobic ammonia oxidation reactor reaches 84%.Although obtained certain progress at the biological ammonia nitrogen removal technology and the development of new ammonia nitrogen removal technical elements that pass the improvement system, particularly short distance nitration-denitrification biological denitrogenation and short distance nitration-anaerobic ammoxidation bio-denitrification technology, owing to have advantages such as cutting down the consumption of energy, save carbon source, minimizing mud turnout, be subjected to people's common concern, for the processing of hanging down the COD high ammonia-nitrogen wastewater provides feasible approach, become one of focus of wastewater biological denitrificaion area research and application.But still there is the large-scale industrial application that has limited these methods as handling problems such as load is low, system is unstable, the nitrosification stage is difficult to control.
Summary of the invention
At the deficiencies in the prior art, the invention provides a kind of efficient biochemical treamtent method of higher concentration ammonia-containing water.The inventive method cuts down the consumption of energy, saves except having the advantages such as carbon source, minimizing mud turnout, characteristics such as removal volumetric loading height, the treatment effect that also has ammonia nitrogen is good, the withstand shock ability is strong, system is stable, it is a kind of comprehensive stronger treatment process
The efficient biochemical treamtent method of ammonia-containing water of the present invention comprises following content:
(1) at first inoculum is put into bio-reactor and carried out enlarged culturing, inoculum is the strong microorganism species of the tolerance of Ammonia-Containing Wastewater Treatment.
(2) mixture of the microorganism species after the enlarged culturing or microorganism species and Sewage Plant aerobic activated sludge is added to the nitration reaction pond and handles high ammonia nitrogen, low COD waste water.
(3) water outlet after the nitration treatment enters the denitrification pond and carries out denitrification denitrogenation.
Contain in the microorganism species in step (1) inoculum: Nitrosomas (Nitrosomonas sp.), denitrifying phosphorus removing bacteria (Denitrobacter sp.), Rhodanobacter sp..This inoculum is obtained by cultivation by the matrix that contains nitrifier, the matrix that contains nitrifier derives from the active sludge of natural soil, mud or nitrogenous industrial effluent treatment plant, or other all be rich in the matrix of nitrifier, before cultivating, can carry out common nitrifier enrichment and handle.The cultural method that contains nitrifier matrix is for to cultivate under high-concentration ammonia-nitrogen and high pH value, culturing process nutrient solution ammonia nitrogen starting point concentration is 100～1000mg/L, final ammonia nitrogen concentration is 1200～3000mg/L, preferred 1300～2000mg/L, nutrient solution COD value is lower than 400mg/L, preferably be lower than 200mg/L, the pH value is controlled to be 7.5≤pH≤9.5, when being cultured to the stable nitrite concentration of formation in the supernatant liquor till.Be preferably as follows the culturing process of operate continuously after the first periodical operation: adopt andnon-continuous operation manner earlier, the ammonia nitrogen starting point concentration of water inlet is 200～300mg/L, and temperature is 20 ℃～35 ℃, and the pH value is controlled at 7.8～8.5, and dissolved oxygen concentration is controlled at 2.0～7.0mg/L.Progressively improve influent ammonium concentration, when ammonia nitrogen concentration reaches 400～700mg/L, change the operate continuously mode into.The batch operation mode can be taked batch to change water, reacts under the blowing air condition, stops ventilation then, after the natural subsidence, discharges supernatant liquor, stays thalline, and benefit is gone into new ammonia-containing water in the reactor then.When ammonia nitrogen removal frank improves influent ammonium concentration greater than 90% the time, each amplitude that improves is 50～100mg/L.Andnon-continuous operation manner also can take under the situation of not draining batch to add a certain amount of ammonium salt mode, improves the additional amount of ammonium salt equally greater than 90% the time when ammonia nitrogen removal frank, and each ammonium salt increasing degree of going into of mending is counted 50～100mg/L with ammonia nitrogen.The hydraulic detention time of operate continuously mode is made as 14～20h, and the pH value is controlled in 8.2～8.5 scopes, and dissolved oxygen concentration is controlled at 1.0～4.0mg/L.Keeping under the condition of denitrification percent more than 70%, improving ammonia nitrogen in waste water concentration gradually or reduce the extension rate of high ammonia-containing water gradually, reaching 800～3000mg/L until influent ammonium concentration.Adopt this process can obtain the required inoculum that is used for enlarged culturing fast.
Enlarged culturing described in the step (1) is cultivated for inoculum is put into bio-reactor, carries out under high ammonia nitrogen, high pH condition.Nutrient solution can be autogamy ammonia-containing water or actual ammonia nitrogen waste water, and the ammonia nitrogen concentration in the nutrient solution is 200mg/L～3000mg/L, and the COD value is lower than 500mg/L, preferably is lower than 300mg/L, and optimum is lower than 200mg/L.Described enlarged culturing condition: the pH value is 7.4～9.5, preferred 7.8～8.5; Temperature is 10 ℃～40 ℃, preferred 20 ℃～35 ℃; DO (dissolved oxygen) as long as be controlled at can guarantee in the scope that nitration reaction normally carries out.During enlarged culturing, inoculum is that 0.3～1.5g/L adds according to MLSS (suspended solids content), mix when using with active sludge, inoculum is that 0.5～1.0g/L adds according to MLSS, and the inoculum size of active sludge is that 10%～50% of bio-reactor useful volume adds.
Described enlarged culturing mode can be that intermittently cultivation also can be that cultured continuously can also be intermittently to cultivate the back cultured continuously earlier.When the MLSS of enlarged culturing thalline reaches 1.5～3.5g/L, can take out the part thalline and be added to and handle ammonia nitrogen waste water in the nitrification tank.When handling ammonia nitrogen waste water, the dosage of enlarged culturing thalline is 0.3～1.5g/L by MLSS, mix when using with active sludge, the dosage of enlarged culturing thalline is 0.5～1.0g/L by MLSS, and the dosage of active sludge is 10%～50% of a bio-reactor useful volume.In wastewater treatment process, can regularly or in wastewater treatment equipment, replenish the thalline of an amount of enlarged culturing continuously, to improve water treatment effect.Perhaps pollutent fluctuation or other condition change when causing decontamination effect improving to reduce in waste water, and the thalline that replenishes an amount of enlarged culturing improves run stability and shock resistance to improve the purifying treatment effect.
Step in the inventive method (1) and step (2) are preferably in two devices carries out, on a device, carry out earlier the amplification culture of microorganism species, get the part flora then and on another device, handle high-concentration ammonia nitrogenous wastewater, bacterium source supplementary question when the microorganism species of cultivating that is used for Ammonia-Containing Wastewater Treatment can solve nitrification tank simultaneously and is hit guarantees the long-term stability operation of system.
Ammonia nitrogen concentration is in the nutrient solution concentration range described in (1) in the described high ammonia nitrogen of step (2), the low COD waste water, and promptly influent ammonium concentration is 200mg/L～2000mg/L, preferred 300mg/L～1000mg/L.The influent ammonia nitrogen volumetric loading is 0.5～2.1KgNH
3-N/m
3D, ammonia nitrogen removal frank are 98%; Preferred 0.7～2.4KgNH
3-N/m
3D, ammonia nitrogen removal frank are 99%.
Nitration reaction can be that batch operation also can be the continous way operation in the step (2), and the pH value is 7.4～9.5, preferred 7.8～8.5; Temperature is 10 ℃～40 ℃, preferred 20 ℃～35 ℃; Dissolved oxygen concentration is controlled at 1.0～4.0mg/L, and the reaction times can be determined according to handling index request.
The operational condition of the anti-nitration reaction of step (3) can be determined by this area general knowledge.In the denitrification denitrogenation reaction tank of step (3), also can add the denitrifier granule sludge of the existing method cultivation in this area or the active sludge of gathering denitrifying denitrifier.The enriching method of gathering denitrifying denitrifier active sludge can for: adopt the sewage after the nitration treatment, its main component is nitrite nitrogen (NO
2 --N), additional carbon is 4: 1～8: 1 to C: N (atomic ratio), carbon source can be all organism that embody COD, and as glucose, methyl alcohol etc., or waste water.The employing anaerobism is cultivated, and the oxygen meltage is＜1mg/L to adopt agitator to stir stir speed (S.S.) 100～300r/min; Temperature is 15～40 ℃; PH is 7.5～8.5; Initial sludge settling ratio is 20～50%, and batch water inlet or water inlet continuously keep nature pH.Active sludge derives from this area active sludge that contains denitrifier commonly used, preferably takes from the active sludge of oil refining sewerage treatment plant and the active sludge of catalyzer sewage work.The concrete operations condition of denitrification denitrogenation process can be adjusted by this area knowledge by those skilled in the art according to the water quality of waste water and the required processing degree of depth.
Characteristics of the present invention are: directly the composition with Ammonia-Containing Wastewater Treatment microorganism species or microorganism species and active sludge is the enlarged culturing that inoculum carries out flora, and microorganism species contains and comprises Nitrosomas (Nitrosomonas sp.) etc.The cultivation of the required inoculum of enlarged culturing adopts batch operation and continous way operation can improve cultivation speed greatly.The condition of enlarged culturing is high ammonia nitrogen, high pH, and is not harsh for the concentration requirement of temperature range and dissolved oxygen.The cultivation of microorganism species and wastewater treatment process can carry out also can separately carrying out in two reactors in same reactor.Thisly directly carry out ammonia-containing water at interior microorganism species as inoculum or part inoculum and handle to contain a large amount of Nitrosomass, compare with existing bio-denitrification technology, cut down the consumption of energy except having, save carbon source, outside the advantages such as minimizing mud turnout, the processing load that also has ammonia nitrogen is high, treatment effect is good, the withstand shock ability is strong, characteristics such as system is stable, it is a kind of comprehensive stronger treatment process, the nitration reaction of the lower concentration ammonia-containing water that produces in refinery industry and the Catalyst Production process can be controlled at the nitrosification stage, be particularly suitable for handling high density (more than the 1500mg/L) ammonia-containing water that produces in the Catalyst Production process.
Description of drawings
Fig. 1 is that the nitrite nitrogen concentration is situation over time in the enlarged culturing process of microorganism species.
Fig. 2 is that MLSS is situation over time in the enlarged culturing process of microorganism species.
Embodiment
Problems such as the ammonia nitrogen volumetric loading that exists in the bio-denitrification technology is low in order to solve, system's fluctuation of service the present invention proposes a kind of high-efficient treatment method of higher concentration ammonia-containing water.This method not only can cut down the consumption of energy, save carbon source, improve the ammonia nitrogen removal load, and can the regular replenishment microorganism species, guarantee reactor operation steady in a long-term.
A kind of concrete higher concentration ammonia-containing water high-efficient treatment method that the present invention proposes is as follows:
(1) carries out enlarged culturing with the microorganism species of Ammonia-Containing Wastewater Treatment or the composition of microorganism species and Sewage Plant aerobic activated sludge as inoculum.Inoculum is that microbial bacteria group time inoculum size is that 0.3～1.5g/L adds according to MLSS (suspended solids content); When inoculum was composition, the MLSS of microorganism species was 0.5～1.0g/L, and the inoculum size of active sludge is 10%～50% of a bio-reactor useful volume.
(2) microorganism species of Ammonia-Containing Wastewater Treatment of the present invention is taked two kinds of cultural methods, and the ammonia nitrogen concentration in the nutrient solution is 800mg/L～1600mg/L, and the COD value is lower than 200mg/L.
Batch cultivation can adopt the mode of batch changing water or batch adding ammonia salt to carry out a batch cultivation.Periodically carry out by water inlet, aeration, sedimentation, drainage procedure when batch changing water, be 1～2 cycle every day, and aeration time accounts for 75%～96% of each cycle.Batch add ammonia salt by stop the supple of gas or steam, mend ammonia, the aeration process period carries out.Also can under the blowing air condition, react, stop ventilation then, add ammonia salt, not draining is when ammonia nitrogen removal frank is added ammonium salt greater than 80% the time, when the nitrite nitrogen in the nutrient solution runs up to 5000mg/L, stop ventilation, after the natural subsidence, discharge supernatant liquor, stay thalline, carry out the cultivation of next batch again.
The hydraulic detention time of the operating method of cultured continuously is 14～20h, determines the water inlet flow velocity according to hydraulic detention time.
Temperature is 20 ℃～35 ℃ in the culturing process, and pH is controlled at 7.8～8.5.DO is greater than 2mg/L.
(3) cultivate 3～20d after, when nutrient solution MLSS reaches 1.5～3.5g/L, take out the part thalline and be added to and handle ammonia nitrogen waste water in the nitrification tank and be used to handle waste water, inoculation method and inoculum size are with (1).
(4) the enrichment culture liquid of denitrifier of the present invention adopts above-mentioned nitrifier enriching apparatus treated water, and main component is a nitrite nitrogen, additional carbon to C: N be 3: 1～8: 1, carbon source can be all organism that COD is provided, as glucose, methyl alcohol etc., or waste water.
Denitrifying bacteria enrichment reaction tank of the present invention can be various suitable structures, and the denitrifier source is identical with above-mentioned nitrifier enrichment, but need not carry out aeration; Anaerobism is cultivated, and adopts agitator to stir, and stir speed (S.S.) is 100～300r/min; Temperature is 15～40 ℃; PH is 7.5～8.5; Initial sludge settling ratio is 20%～50%, and batch water inlet or water inlet continuously keep nature pH.
Embodiment 1 contains the cultivation of Nitrosomas flora inoculum
With the nitrobacteria of laboratory culture as inoculum, inoculation back MLSS is 1.0g/L, with autogamy concentration is that the ammonia-containing water of 300mg/L (the COD value is 30mg/L) is intake as reactor, and pH is controlled at 7.9, and it is about 2.0～3.0mg/L that temperature is controlled at 20 ℃ of dissolved oxygen concentrations.Elder generation's intermittent water inflow stops ventilation behind the reaction 24h, discharges supernatant liquor after the natural subsidence, stays thalline, mends new ammonia-containing water then in reactor.When ammonia nitrogen removal frank improves the ammonia nitrogen concentration of water inlet greater than 90% the time, each amplitude that improves is 100mg/L.The ammonia nitrogen concentration of intaking behind the 8d reaches 700mg/L, changes the continous way operation this moment into, and hydraulic detention time is 14h, and the pH value is controlled at 8.3, and dissolved oxygen concentration is 1.5～2.0mg/L.When ammonia nitrogen removal frank greater than 90% the time, continue to improve influent ammonium concentration, each amplitude that improves is 100mg/L, reaches 1200mg/L until influent ammonium concentration.Stable back ammonia nitrogen removal frank reaches 99%, nitrite nitrogen mean value in the water outlet of detection reaction device reaches 95%, took time altogether 22 days, can obtain to contain the flora of Nitrosomas this moment, not contain through inspection: Nitrosomas (Nitrosomonas sp.), denitrifying phosphorus removing bacteria (Denitrobactersp.) and Rhodanobacter sp. etc.
Embodiment 2 contains the cultivation of Nitrosomas flora inoculum
As inoculum, inoculation back MLSS is 0.5g/L with the nitrococcus of laboratory enrichment and Sewage Plant aerobic activated sludge, the high ammonia-containing water of certain catalyst plant is diluted to 200mg/L (COD value is 17mg/L) intakes as reactor, and pH is controlled at 8.0; Temperature is controlled at 35 ℃, and dissolved oxygen concentration is 4.5～5.5mg/L; Elder generation's intermittent water inflow stops ventilation behind the reaction 24h, removes supernatant liquor after the natural subsidence, stay thalline, mend new ammonia-containing water then in the reactor, the extension rate that reduces raw wastewater when ammonia nitrogen removal frank greater than 90% time makes the ammonia nitrogen concentration of water inlet improve, and each amplitude that improves is 80mg/L; The ammonia nitrogen concentration of intaking behind the 9d reaches 520mg/L, and change the operate continuously mode this moment into, and hydraulic detention time is 20h; The pH value is controlled at 8.4, dissolved oxygen concentration be 3.0～4.0mg/L when ammonia nitrogen removal frank greater than 90% the time, continue to reduce the extension rate of ammonia-containing water, make that the each amplitude that improves of ammonia nitrogen concentration is 80mg/L; Reach 840mg/L until influent ammonium concentration, stable back ammonia nitrogen removal frank reaches 99%, nitrite nitrogen mean value in the water outlet of detection reaction device reaches 95.3%, took time altogether 24 days, can obtain to contain the flora of Nitrosomas this moment, not contain through inspection: Nitrosomas (Nitrosomonas sp.), denitrifying phosphorus removing bacteria (Denitrobacter sp.) and Rhodanobacter sp. etc.
The enlarged culturing of the microorganism species of embodiment 3 Ammonia-Containing Wastewater Treatment
The Nitrosomas flora and the active sludge that obtain with embodiment 1 are the amplification culture that inoculum carries out thalline, the inoculum size of Nitrosomas flora is 0.5g/L by MLSS, the active sludge dosage is 30% of a reactor volume, and influent ammonium concentration is 1500mg/L, and COD is 46mg/L.PH is controlled at 7.9, and temperature is controlled at 25 ℃, and dissolved oxygen concentration is 2.0～3.0mg/L.Adopt a batch training method of adding ammonia salt, 24～48h adds once, and the ammonia nitrogen concentration after the additional ammonia salt in the nutrient solution all is higher than 1200mg/L, behind the cultivation 10d, MLSS is 2.8g/L, after this ammonia-N removal rate descends to some extent, stop the ventilation, treat natural subsidence after, remove supernatant liquor, stay thalline, take out the part microbial population and be added to the nitrification tank Ammonia-Containing Wastewater Treatment, another part continues to cultivate as inoculum.Fig. 1 nitrite nitrogen concentration is situation over time.Can see that from this figure the cultured microorganism flora can tolerate the above nitrite nitrogen of 5000mg/L.
The enlarged culturing of the microorganism species of embodiment 4 Ammonia-Containing Wastewater Treatment
The Nitrosomas flora that obtains with embodiment 2 carries out the amplification culture of thalline as inoculum, and inoculation back MLSS is 0.9g/L, and influent ammonium concentration is 900mg/L, and COD is 80mg/L.PH is controlled at 8.2, and temperature is controlled at 30 ℃, and dissolved oxygen concentration is 2.0～3.0mg/L.Adopt the mode of cultured continuously, hydraulic detention time is 14h.After cultivating 4d, MLSS is 2.0g/L, and after this ammonia nitrogen removal frank is stabilized in about 100%, and can take out the part microbial population and be added to the nitrification tank Ammonia-Containing Wastewater Treatment this moment.Fig. 2 is a MLSS and clearance trend over time in the culturing process.
Embodiment 5 denitrification denitrogenation bacterium enrichments
The enrichment parameter is: anaerobism is cultivated, and adopts agitator to stir, and stir speed (S.S.) is made as 150r/min; Temperature is 15～30 ℃; PH:7.5～8.5; Initial sludge settling ratio is 30%; Reaction system cumulative volume 5L, batch water inlet, every 24h stops stirring and renews water 3L.
Measure SV30, SVI and the denitrogenation speed of active sludge behind enrichment 0d and the 60d, seen Table 1.
Denitrogenation speed and the settling ratio and the bulk index of active sludge before and after table 1 enrichment
As known from Table 1, though through after one section enrichment, because carbon source is in liberal supply, sludge concentration sharply rises, often need discharging mud or inoculation to handle waste water for the denitrification reaction pond during therefore real industrial application, but also increase substantially, improved 28.7 times through enrichment denitrogenation speed.
Embodiment 6
Microorganism species with embodiment 3 amplification culture is added in the nitrification tank as inoculum, and inoculation back MLSS is 1.5g/L, and influent ammonium concentration is 1500mg/L, and the COD value is 20mg/L.PH is controlled at 7.8, and temperature is controlled at 28 ℃, and dissolved oxygen concentration is 3.0～5.0mg/L.Adopt the mode of water inlet continuously, hydraulic detention time is 18h, ammonia nitrogen volumetric loading 2.1KgNH
3-N/m
3D.After cultivating 3d, nitrification enters steady operational status, and ammonia nitrogen removal frank reaches 98%, nitrite nitrogen mean value in the nitrated water outlet reaches 95%, after nitrated water outlet entered the denitrification pond, after embodiment 5 described denitrification denitrogenations processing, nitrogen removal rate reached more than 95%.
Embodiment 7
Get the high ammonia-containing water of certain catalyst plant, its ammonia nitrogen concentration is 1200mg/L, and COD is 100mg/L.30% loading according to the reactor useful volume is rich in this waste water of active sludge treatment of nitrifier in the nitration reaction pond earlier.PH is controlled at 8.2; Temperature is controlled at 30 ℃; Dissolved oxygen concentration is 6.0～7.0mg/L.Elder generation's intermittent water inflow stops ventilation behind the reaction 24h, removes supernatant liquor after the natural subsidence, stays thalline, mends new ammonia-containing water then in reactor, guarantees ammonia nitrogen volumetric loading 0.9KgNH
3-N/m
3Under the situation of d, ammonia nitrogen removal frank is up to 50% behind the processing 7d.After this inoculate a certain amount of embodiment 2 cultured microorganism floras in nitrification tank, inoculation back MLSS is 1.0g/L, and ammonia nitrogen removal frank reaches more than 90% behind the operation 2d of system, and the ammonia nitrogen volumetric loading reaches 1.9KgNH
3-N/m
3D.After this change continuous water inlet into, hydraulic detention time is 18h, after cultivating 5d, nitrification enters steady operational status, ammonia nitrogen removal frank reaches 99%, and the nitrite nitrogen mean value in the nitrated water outlet reaches 94%, after nitrated water outlet enters the denitrification pond, after embodiment 5 described denitrification denitrogenations processing, nitrogen removal rate reaches more than 95%.
Claims (10)
1. ammonia-containing water efficient biochemical treamtent method is characterized in that comprising following process:
(1) at first inoculum is put into bio-reactor and carried out enlarged culturing, inoculum is the strong microorganism species of the tolerance of Ammonia-Containing Wastewater Treatment;
(2) mixture of the microorganism species after the enlarged culturing or microorganism species and Sewage Plant aerobic activated sludge is added to the nitration reaction pond and handles high ammonia nitrogen, low COD waste water;
(3) water outlet after the nitration treatment enters the denitrification pond and carries out denitrification denitrogenation.
2. it is characterized in that in accordance with the method for claim 1: contain in the microorganism species in step (1) inoculum: Nitrosomas, denitrifying phosphorus removing bacteria and Rhodanobacter sp..
3. according to claim 1 or 2 described methods, it is characterized in that: step (1) inoculum is obtained by cultivation by the matrix that contains nitrifier, the cultural method that contains nitrifier matrix is for to cultivate under high-concentration ammonia-nitrogen and high pH value, culturing process nutrient solution ammonia nitrogen starting point concentration is 100～1000mg/L, final ammonia nitrogen concentration is 1200～3000mg/L, nutrient solution COD value is lower than 400mg/L, the pH value is controlled to be 7.5≤pH≤9.5, when being cultured to the stable nitrite concentration of formation in the supernatant liquor till.
4. according to claim 1 or 2 described methods, it is characterized in that: step (1) inoculum is obtained by cultivation by the matrix that contains nitrifier, the cultural method that contains nitrifier matrix adopts the culturing process of operate continuously after the first periodical operation: adopt andnon-continuous operation manner earlier, the ammonia nitrogen starting point concentration of water inlet is 200～300mg/L, temperature is 20 ℃～35 ℃, the pH value is controlled at 7.8～8.5, dissolved oxygen concentration is controlled at 2.0～7.0mg/L, progressively improve influent ammonium concentration, when ammonia nitrogen concentration reaches 400～700mg/L, change the operate continuously mode into; The hydraulic detention time of operate continuously mode is made as 14～20h, and the pH value is controlled in 8.2～8.5 scopes, and dissolved oxygen concentration is controlled at 1.0～4.0mg/L, is 800～3000mg/L until influent ammonium concentration.
5. in accordance with the method for claim 1, it is characterized in that: the enlarged culturing described in the step (1) is cultivated for inoculum is put into bio-reactor, ammonia nitrogen concentration in the nutrient solution is 200mg/L～3000mg/L, the COD value is lower than 500mg/L, the enlarged culturing condition: the pH value is 7.4～9.5, temperature is 10 ℃～40 ℃, and dissolved oxygen is controlled at and can guarantees in the scope that nitration reaction normally carries out; During enlarged culturing, inoculum is that 0.3～1.5g/L adds according to MLSS, mixes with active sludge when using, and inoculum is that 0.5～1.0g/L adds according to MLSS, and the inoculum size of active sludge is that 10%～50% of bio-reactor useful volume adds; When the MLSS of enlarged culturing thalline reached 1.5～3.5g/L, taking-up part thalline is added to handled ammonia nitrogen waste water in the nitrification tank.
6. in accordance with the method for claim 5, it is characterized in that: the COD value in the described nutrient solution is lower than 300mg/L, described enlarged culturing condition: pH value 7.8～8.5, temperature are 20 ℃～35 ℃.
7. in accordance with the method for claim 1, it is characterized in that: the described high ammonia nitrogen of step (2), low COD ammonia nitrogen in waste water concentration are 200mg/L～2000mg/L, and the COD value is lower than 500mg/L, and the influent ammonia nitrogen volumetric loading is 0.5～2.1KgNH
3-N/m
3D; Nitration reaction is batch operation or continous way operation in the step (2), and the pH value is 7.4～9.5, and temperature is 10 ℃～40 ℃, and dissolved oxygen concentration is controlled at 1.0～4.0mg/L.
8. in accordance with the method for claim 1, it is characterized in that: step (2) is handled in the waste water process, the regular or continuous thalline that replenishes an amount of enlarged culturing in wastewater treatment equipment.
9. in accordance with the method for claim 1, it is characterized in that: when step (2) is handled ammonia nitrogen waste water, the dosage of enlarged culturing thalline is 0.3～1.5g/L by MLSS, mix when using with active sludge, the dosage of enlarged culturing thalline is 0.5～1.0g/L by MLSS, and the dosage of active sludge is 10%～50% of a bio-reactor useful volume.
10. in accordance with the method for claim 1, it is characterized in that: in the denitrification denitrogenation reaction tank of step (3), add the active sludge of denitrifier granule sludge or gathering denitrifying denitrifier.
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