CN103496788A - Rapid starting method of shortcut nitrification and denitrification in A/O (Anoxic/Oxic) process - Google Patents
Rapid starting method of shortcut nitrification and denitrification in A/O (Anoxic/Oxic) process Download PDFInfo
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Abstract
The invention discloses a rapid starting method of shortcut nitrification and denitrification in an A/O (Anoxic/Oxic) process. The rapid starting method comprises the following steps of: (1) placing a suspended filler in an oxic tank; (2) respectively placing inoculated sludge in an anoxic tank and the oxic tank; (3) enabling wastewater to sequentially flow through the anoxic tank and the oxic tank in a continuous operation manner, wherein the ammonia nitrogen concentration of the wastewater is 25-60mg/L, the ratio of carbon to nitrogen is 2-8, and the proportion of nitrite in the oxic tank reaches above 70%, and the yielding water nitrogen removal efficiency is stabilized at 80%-90%, thus completing the starting process of the shortcut nitrification and denitrification. The rapid starting method has the advantages that the starting time of the shortcut nitrification and denitrification in the A/O process is short, the accumulation rate of the nitrite in the oxic tank reaches above 70%, the nitrogen removal efficiency of the whole process can reach above 90%, and the long-term stable operation of a reactor can be ensured.
Description
Technical field
The present invention relates to technical field of sewage, be specifically related to a kind of quick start method of A/O technique short-cut nitrification and denitrification.
Background technology
The discharge of Nitrogen-and Phosphorus-containing waste water is a major cause that causes body eutrophication, and after Taihu Lake basin Wuxi City generation water supply critical incidents in 2007, country has proposed stricter water quality requirement to the tail water discharge of Taihu Lake basin urban wastewater treatment firm.The sewage of the up-to-date promulgation of China is put content that standard (GBl8918-2002) requires all pollutant discharging units last water outlet nitrogen phosphorus and is respectively total phosphorus according to the grade of receiving water body and is less than 0.5mg/L, and ammonia nitrogen is less than 5mg/L, and total nitrogen is less than 15mg/L(one-level A standard).As can be seen here, be the requirement that newly-built Sewage Plant or existing Sewage Plant all are faced with the sewage deep denitrogenation dephosphorizing.Therefore, the most of urban wastewater treatment firms of China all are faced with the problem of upgrading at present, need the new sewage treatment process that the research and development fund is saved, processing efficiency is high.Comparatively speaking, the intensive treatment of phosphorus is relatively easy, because the phosphorus in sewage exists mainly with the form of phosphate radical greatly, adds chemical coagulator just can make its precipitation.And the processing of nitrogen is difficult to, all can not its removal and expense is higher with adding the methods such as coagulating agent and micro-filtration, ultrafiltration, nanofiltration.Biological denitrificaion is the most economical method of effectively denitrogenating.
Along with the raising of people's living standard, the phenomenon of the low C/N ratio of city domestic sewage is increasingly general, causes denitrification difficulty in the bio-denitrifying sewage process, the problems such as nitric efficiency reduction.Traditional biological nutrition salt is removed the operating method that technique (BNR) adopts anaerobism, double oxygen and aerobic alternate run usually, to remove nitrogen phosphorus and the organism in waste water.In BNR technique, nitrification mainly relies on poky autotrophic bacteria, therefore requires longer sludge retention time (SRT) and relative high oxygen concentration; And the required organic electronic donor of denitrification is not enough often in water inlet.And short-cut nitrification and denitrification can overcome above-mentioned shortcoming, its main advantage is that the approach of denitrogenation shortens, the oxygen requirement of saving 25% in nitrifying process, save 40% organic carbon source, improved the speed of biological denitrification process, realize that short distance nitration can also reduce the quantity discharged of excess sludge greatly, be particularly suitable for the biological denitrificaion to low C/N waste water.Therefore, this technique has become the study hotspot of domestic and international denitrification process.
From reaction process, the realization of short distance nitration process is the key of this technique, and nitrifying process is controlled to Nitrification Stage, and the accumulation of the nitrous acid nitrogen of making great efforts to remain stable is to need the main bugbear solved.At present short-cut nitrification and denitrification technique is mainly for the treatment of high ammonia-nitrogen wastewater, process aspect the relatively low sanitary sewage of ammonia nitrogen just at the early-stage.How to start fast and to realize that be one of emphasis of ammonia-containing water process field research at low C/N than the operation of the long-term stability of reactor under condition.
Usually utilize the intrinsic difference of the dynamics of ammonia oxidation bacteria (AOB) and nitrous acid oxidation bacterium (NOB), adopt to control and high temperature (SHARON technique), low dissolved axygen (OLAND technique), higher pH, high ammonia nitrogen loading and mud age etc. two class bacteria growings to be produced to Different Effects and realize short distance nitration.The core of SHARON technique is to utilize (30-35 ℃) under high temperature, and the growth velocity of ammonia oxidation bacteria, higher than nitrous acid oxidation bacterium, by controlling sludge retention time (SRT), washes out nitrous acid oxidation bacterium.This technique is best suited for the waste water of high temperature, low organic carbon.In addition, also can adopt high density free ammonia (FA), high pH or lower concentration DO to slow down the oxidation of nitrite, nitrous acid oxidation bacterium is washed out from reactor, the method is best suited for the hypodynamic waste water of buffer capacity of (<20 ℃) under lesser temps.Quantity research shows greatly, and the free ammonia of high density can suppress nitrous acid oxidation bacterium.
The Chinese invention patent application that application number is 200410017477.7 discloses a kind of quick start method of ammonia-containing water short distance nitration, its feature is to using aerobic activated sludge as inoculum, adopt the operate continuously mode, at first using the ammonia nitrogen of low concentration as water inlet, temperature is controlled to 25 ℃～28 ℃, pH is controlled at 7.2-7.5, and Dissolved Oxygen concentration Control is at 2.5～3.0mg/L, the enrichment nitrobacteria; Increase gradually the ammonia nitrogen influent concentration, when ammonia nitrogen removal frank reaches 97～99%, pH is controlled to 8.0～8.2, temperature is controlled at 32 ℃～35 ℃, and Dissolved Oxygen concentration Control, at 1.0～1.5mg/L, is eliminated NOB.What this inventive method was processed is the middle and high concentration ammonia-containing water.
Application number is the quick start method that 200810012685.6 Chinese invention patent applications disclose a kind of ammonia-containing water short distance nitration, its feature is that to take the composition of nitrobacteria and Sewage Plant aerobic activated sludge be inoculum, at first adopt andnon-continuous operation manner, the ammonia nitrogen starting point concentration of water inlet is 200～300mg/L, and the pH value is controlled at 7.8～8.5; Progressively improve influent ammonium concentration, change the operate continuously mode into when ammonia nitrogen concentration reaches 400～700mg/L; The hydraulic detention time of operate continuously mode is made as 14～20h, the pH value is controlled in 8.2～8.5 scopes, keeping under the condition of denitrification percent more than 70%, improving gradually ammonia nitrogen in waste water concentration or reduce gradually the extension rate of high ammonia-containing water, until influent ammonium concentration reaches 800～1200mg/L.What this inventive method was processed is strong ammonia wastewater.
Summary of the invention
The invention provides a kind of quick start method of A/O technique short-cut nitrification and denitrification, start fast and realize moving than the long-term stability of reactor under condition at low C/N.
A kind of quick start method of A/O technique short-cut nitrification and denitrification, comprise the steps:
(1) floating stuffing is placed in to Aerobic Pond;
(2) seed sludge is placed in respectively to anoxic pond and Aerobic Pond;
(3) in the operate continuously mode by waste water flow through successively anoxic pond and Aerobic Pond, the ammonia nitrogen concentration of described waste water is 25～60mg/L, carbon-nitrogen ratio is 2～8, nitrite ratio in Aerobic Pond reaches more than 70%, and keep the water outlet nitric efficiency to be stabilized in 80%～90%, complete the start-up course of short-cut nitrification and denitrification.
In order in traditional A/O technique, to realize fast short-cut nitrification and denitrification, the present invention proposes a kind of quick start method of new short-cut nitrification and denitrification.The method is short the start time in A/O technique, and the accumulation rate of Aerobic Pond nitrite can reach more than 70%, and the nitric efficiency of whole technique reaches and can arrive more than 90%, and can guarantee reactor operation steady in a long-term.
Along with the raising of people's living standard, the phenomenon of the low C/N ratio of city domestic sewage is increasingly general, causes denitrification difficulty in the bio-denitrifying sewage process, the problems such as nitric efficiency reduction.And the short-cut nitrification and denitrification biological denitrification process has and saves aeration rate and denitrifying carbon source, reaction efficiency high, for processing low C/N sewage, there is unique advantage.But the research of the biological de-technique of short-cut nitrification and denitrification is confined to such as high-concentration ammonia-nitrogen waste water such as percolates more both at home and abroad at present, adopts the research of this art breading real life sewage also seldom.Starting method of the present invention is particularly useful for the processing of the waste water of low ammonia nitrogen concentration, low ratio of carbon to ammonium, the present invention adopts the operate continuously mode, at present for the technique that realizes the wastewater treatment short-cut nitrification and denitrification, be generally SBR technique, realize comparatively difficulty of short-cut nitrification and denitrification in continuous flow reactor.
Usually utilize the intrinsic difference of the dynamics of ammonia oxidation bacteria (AOB) and nitrous acid oxidation bacterium (NOB) in existing technique, adopt and control high temperature (SHARON technique), low dissolved axygen (OLAND technique), higher pH, high ammonia nitrogen loading and mud age etc. two class bacteria growings generation Different Effects are realized to short distance nitration.The present invention by control, intake and reactor in pH and DO slow down the oxidation of nitrite, nitrous acid oxidation bacterium is washed out from reactor.
As preferably, described waste water is 5～8h at the hydraulic detention time of anoxic pond and Aerobic Pond; The water inlet pH value of described waste water is 7.5～8.0; The redox potential set(ting)value of anoxic pond Wei – 115～– 105mV, the dissolved oxygen concentration in Aerobic Pond is 0.5～1.0mg/L, and the inner circulating reflux ratio is 1～2, and return sludge ratio is 0.5～1.
As preferably, described in step (1), the dosage of floating stuffing is 10%～20% of Aerobic Pond volume.
As preferably, described in step (1), floating stuffing is PE sponge filler or polyurethane foam sponge filler.As the PE sponge filler, its length is the cubes of 1cm, and density is 0.99g/cm
3; Polyurethane foam sponge filler, its length is the cubes of 1cm, micro-pore diameter 1.5mm, density is close to water, and such floating stuffing surface-area is large, density approaches, is difficult for obstruction with water.
Add the carrier of filler as attached growth of microorganisms in the active sludge aerobic pond, make generation time longer nitrobacteria preferentially to be attached on carrier, make nitrification not be subject to the impact of the solid retention time (SRT) of suspension growth, can make system under shorter SRT condition, keep higher rate of nitrification, thereby improve the nitric efficiency of system
As preferably, described in step (2), seed sludge is municipal sewage plant's aerobic activated sludge, and seed sludge concentration is 16～18g/L, and inoculum size is 30%～40% of bio-reactor useful volume.Sludge concentration after inoculation in Aerobic Pond and anoxic pond is 2-3g/L.
As preferably, the useful volume of Aerobic Pond and anoxic pond is than being 1:1.
As preferably, in start-up course, wastewater temperature is 25～30 ℃.
The quick start method concrete steps of A/O technique short-cut nitrification and denitrification of the present invention are as follows:
(1) choose that specific surface area is large, density is approaching with water, not susceptible to plugging floating stuffing is positioned over Aerobic Pond, filler and mud are evenly inoculated, and the filler dosage accounts for 10%～20% of reactor volume;
(2) seed sludge is put into respectively to anoxic pond and Aerobic Pond, seed sludge is municipal sewage plant's aerobic activated sludge, and seed sludge concentration is the 17g/L left and right, and inoculum size is 30%～40% of bio-reactor useful volume;
(3) in start-up course, temperature is 25～30 ℃;
(4) adopt the Continuous Flow operating method, the low ratio of carbon to ammonium waste water that contains middle low-concentration ammonia-nitrogen of take is to process object, Aerobic Pond is 1:1 with the useful volume ratio of anoxic pond, the hydraulic detention time of anoxic pond and Aerobic Pond all is made as the 6h left and right, water inlet pH value is controlled at 7.5～8.0, and limit its fluctuation up and down in Aerobic Pond and anoxic pond, between the redox potential set(ting)value Wei Chi – 115～– 105mV of anoxic pond, Dissolved Oxygen concentration Control in Aerobic Pond is at 0.5～1.0mg/L, the inner circulating reflux ratio is made as 1～2, and return sludge ratio is made as 0.5～1.
(5) the nitrite ratio in Aerobic Pond reaches more than 70%, and the water outlet nitric efficiency 80%～90% the time, completes the start-up course of short-cut nitrification and denitrification.
The present invention proposes a kind of simple and easy to do short-cut nitrification and denitrification quick start method, reduce the startup difficulty of short distance nitration and can under the operate continuously mode, guarantee reactor operation steady in a long-term, system has the advantages such as anti impulsion load, high, the difficult generation sludge bulking of nitric efficiency, and processes the standard that water outlet can reach " urban wastewater treatment firm pollutant emission standard " one-level A.
Short-cut nitrification and denitrification quick start method of the present invention can be realized fast the denitrogenation processing of waste water in A/O technique, and processing efficiency is high, can be used for the denitrogenation processing of city domestic sewage.
Embodiment
Embodiment 1
Choose that specific surface area is large, density is approaching with water, not susceptible to plugging sponge filler (1cm*1cm*1cm), be positioned over Aerobic Pond, filler and mud are evenly inoculated, and the filler dosage accounts for 10% of reactor volume.Using the aerobic activated sludge of municipal sewage plant as inoculum, and after inoculation, MLSS is 3g/L, and the volume ratio of Aerobic Pond and anoxic pond is 1:1, and the inoculum size of mud in Aerobic Pond and anoxic pond is 30% of corresponding reaction tank useful volume.
Using the synthetic wastewater of human configuration as water inlet, and influent COD/N ratio is 6, composed as follows: (NH
4)
2sO
4283mg/L, NaHCO
3720mg/L, K
2hPO
470mg/L, MgSO
47H
2o100mg/L, NaCl58.5mg/L, sodium acetate 463mg/L, micro-1mL/L.Trace element forms (g/L): ZnSO
47H
2o0.43, H
3bO
40.014, MnC1
24H
2o0.99, Na
2moO
42H
2o0.22, CuSO
45H
2o0.25, CoCl
26H
2o0.24, NiCl
26H
2o0.19, EDTA10.
Water intake mode operation continuously, the hydraulic detention time of anoxic pond and Aerobic Pond all is made as 7h, water inlet pH is 7.5, temperature is controlled to 25 ℃, between the redox potential set(ting)value Wei Chi – 108～– 105mV of anoxic pond, Dissolved Oxygen concentration Control in Aerobic Pond is at 1.0mg/L, and the inner circulating reflux ratio is made as 2, and return sludge ratio is made as 1.
After stable, the clearance that ammonia nitrogen removal frank reaches 97%, TN reaches 93%, and the cumulative percentage of the water outlet nitrite of Aerobic Pond is 80%, has now realized the quick startup of short-cut nitrification and denitrification, needs altogether 3 day time.
Embodiment 2
Choose that specific surface area is large, density is approaching with water, not susceptible to plugging sponge filler (1cm*1cm*1cm), be positioned over Aerobic Pond, filler and mud are evenly inoculated, and the filler dosage accounts for 20% of reactor volume.Using the aerobic activated sludge of municipal sewage plant as inoculum, be seeded to Aerobic Pond and anoxic pond, the volume ratio of Aerobic Pond and anoxic pond is 1:1, and the MLSS of seed sludge is 17g/L, and inoculum size is 30% of bio-reactor useful volume.
Using the synthetic wastewater of human configuration as water inlet, and influent COD/N ratio is 4, composed as follows: (NH
4)
2sO
4236mg/L, NaHCO
3600mg/L, K
2hPO
470mg/L, MgSO
47H
2o100mg/L, NaCl58.5mg/L, sodium acetate 257mg/L, micro-1mL/L.Trace element forms (g/L): ZnSO
47H
2o0.43, H
3bO
40.014, MnC1
24H
2o0.99, Na
2moO
42H
2o0.22, CuSO
45H
2o0.25, CoCl
26H
2o0.24, NiCl
26H
2o0.19, EDTA10.
Water intake mode operation continuously, the hydraulic detention time of anoxic pond and Aerobic Pond all is made as 6h, water inlet pH is 7.5, temperature is controlled to 30 ℃, between the redox potential set(ting)value Wei Chi – 113～– 110mV of anoxic pond, Dissolved Oxygen concentration Control in Aerobic Pond is at 0.8mg/L, and the inner circulating reflux ratio is made as 1, and return sludge ratio is made as 1.
After stable, the clearance that ammonia nitrogen removal frank reaches 93%, TN reaches 91%, and the cumulative percentage of the water outlet nitrite of Aerobic Pond is 60%, has now realized the quick startup of short-cut nitrification and denitrification, needs altogether 5 day time.
Embodiment 3
Choose that specific surface area is large, density is approaching with water, not susceptible to plugging sponge filler (1cm*1cm*1cm), be positioned over Aerobic Pond, filler and mud are evenly inoculated, and the filler dosage accounts for 15% of reactor volume.Using the aerobic activated sludge of municipal sewage plant as inoculum, and after inoculation, MLSS is 5g/L, and the volume ratio of Aerobic Pond and anoxic pond is 1:1, and the inoculum size of mud in Aerobic Pond and anoxic pond is 40% of corresponding reaction tank useful volume
Using city domestic sewage as water inlet, and influent COD/N ratio is about 5.5.Influent quality is as follows: TCOD341mg/L, ammonia nitrogen 44mg/L, TN62mg/L, SS80mg/L, TP7.2mg/L, pH7.3.Water intake mode operation continuously, the hydraulic detention time of anoxic pond and Aerobic Pond all is made as 6h, temperature is controlled to 28 ℃, between the redox potential set(ting)value Wei Chi – 113～– 110mV of anoxic pond, Dissolved Oxygen concentration Control in Aerobic Pond is at 0.7mg/L, the inner circulating reflux ratio is made as 2, and return sludge ratio is made as 1.
After stable, the clearance that ammonia nitrogen removal frank reaches 91%, TN reaches 90%, and the cumulative percentage of the water outlet nitrite of Aerobic Pond is 75%, has now realized the quick startup of short-cut nitrification and denitrification, needs altogether 7 day time.
Claims (8)
1. the quick start method of an A/O technique short-cut nitrification and denitrification, is characterized in that, comprises the steps:
(1) floating stuffing is placed in to Aerobic Pond;
(2) seed sludge is placed in respectively to anoxic pond and Aerobic Pond;
(3) in the operate continuously mode by waste water flow through successively anoxic pond and Aerobic Pond, the ammonia nitrogen concentration of described waste water is 25～60mg/L, carbon-nitrogen ratio is 2～8, nitrite ratio in Aerobic Pond reaches more than 70%, and keep the water outlet nitric efficiency to be stabilized in 80%～90%, complete the start-up course of short-cut nitrification and denitrification.
2. the quick start method of A/O technique short-cut nitrification and denitrification according to claim 1, is characterized in that, described waste water is 5～8h at the hydraulic detention time of anoxic pond and Aerobic Pond.
3. the quick start method of A/O technique short-cut nitrification and denitrification according to claim 1, is characterized in that, the water inlet pH value of described waste water is 7.5～8.0.
4. the quick start method of A/O technique short-cut nitrification and denitrification according to claim 1, it is characterized in that, the redox potential set(ting)value Wei – 115～– 105mV of anoxic pond, dissolved oxygen concentration in Aerobic Pond is 0.5～1.0mg/L, the inner circulating reflux ratio is 1～2, and return sludge ratio is 0.5～1.
5. the quick start method of A/O technique short-cut nitrification and denitrification according to claim 1, is characterized in that, described in step (1), the dosage of floating stuffing is 10%～20% of Aerobic Pond volume.
6. the quick start method of A/O technique short-cut nitrification and denitrification according to claim 1, is characterized in that, described in step (1), floating stuffing is PE sponge filler or polyurethane foam sponge filler.
7. the quick start method of A/O technique short-cut nitrification and denitrification according to claim 1, it is characterized in that, described in step (2), seed sludge is municipal sewage plant's aerobic activated sludge, seed sludge concentration is 16～18g/L, and inoculum size is 30%～40% of bio-reactor useful volume.
8. the quick start method of A/O technique short-cut nitrification and denitrification according to claim 1, is characterized in that, the useful volume of Aerobic Pond and anoxic pond is than being 1:1.
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| CN106517507A (en) * | 2016-12-19 | 2017-03-22 | 河北工业大学 | Method and device for quickly starting anaerobic ammonia oxidation at normal temperature |
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| CN108975497A (en) * | 2017-05-31 | 2018-12-11 | 中国石油化工股份有限公司 | The processing method of acrylic nitrile waste water |
| CN109502755A (en) * | 2018-12-12 | 2019-03-22 | 南京高新工大生物技术研究院有限公司 | A kind of short-cut nitrification-denitrification municipal sewage system and method |
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| CN110683646A (en) * | 2019-11-04 | 2020-01-14 | 黄河三角洲京博化工研究院有限公司 | Process for rapidly realizing short-cut nitrification and denitrification of leather wastewater |
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