CN105084536A - Biologically enhanced treatment method for medium-and-low concentration ammonia-nitrogen wastewater - Google Patents

Biologically enhanced treatment method for medium-and-low concentration ammonia-nitrogen wastewater Download PDF

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Publication number
CN105084536A
CN105084536A CN201410217956.7A CN201410217956A CN105084536A CN 105084536 A CN105084536 A CN 105084536A CN 201410217956 A CN201410217956 A CN 201410217956A CN 105084536 A CN105084536 A CN 105084536A
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wastewater
low concentration
carrier
nitrogen
biological
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CN201410217956.7A
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戴昕
安立超
曹惠忠
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Nanjing Kesheng Environmental Protection Technology Co Ltd
Nanjing University of Science and Technology
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Nanjing Kesheng Environmental Protection Technology Co Ltd
Nanjing University of Science and Technology
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Priority to CN201410217956.7A priority Critical patent/CN105084536A/en
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Abstract

The invention discloses a biologically enhanced treatment method for medium-and-low concentration ammonia-nitrogen wastewater. The method employs combined anoxic-aeration biological fluidized bed technology; an anoxic reaction tank is filled with a combined microbial filling material; and an embedding-process immobilized microbial carrier is added into an aeration biological fluidized bed. The method comprises the following successive steps: allowing pretreated medium-and-low concentration ammonia-nitrogen wastewater to enter the anoxic reaction tank, removing nitrogen oxide (mainly nitrite nitrogen) in back water by using denitrifying bacteria adhered on the combined filling material and removing a part of organic matters; allowing effluent of the anoxic reaction tank to enter the aeration biological fluidized bed, wherein since the immobilized microbial carrier is in a fluidized state under aeration conditions and uniformly distributed in the fluidized bed, full contact between the carrier and the wastewater is realized; and converting ammonia nitrogen in the wastewater into nitrite nitrogen by using ammoxidation bacteria growing in the carrier and on the surface of the carrier, removing a part of total nitrogen and rest organic matters at the same time and allowing effluent to flow back to the front anoxic reaction tank.

Description

A kind of biological enhanced processing method of middle Low Concentration Ammonia Containing Wastewater
Technical field
The invention belongs to water treatment field, be specifically related to a kind of bioremediation of middle Low Concentration Ammonia Containing Wastewater.The method specifically adopts anoxic-aerated biological fludized bed combination treatment method, organism fluidization bed technique and using embedding immobilization microorganism technology groups is combined.The present invention is applicable to the process of Low Concentration Ammonia Containing Wastewater in chemical industry, cultivation, municipal effluent etc.
Background technology
Ammonia nitrogen waste water derives from multiple industry fields such as chemical industry, cultivation, municipal effluent, the direct discharge of a large amount of ammonia nitrogen waste water can stimulate the waterplant hypertrophy such as algae, there is the contamination phenomenon of the eutrophication such as Chi Hu, red tide, some of them algae protein matter toxin can be enriched in aquatic living things body, and makes people poisoning by food chain.The treatment process of current domestic centering Low Concentration Ammonia Containing Wastewater, mainly by biological process denitrogenation, utilizes the nitrification of nitrobacteria and the denitrogenation of denitrifying bacterium to realize the removal of nitrogen in waste water.But, nitrobacteria poor growth, generation cycle be long, compete in conventional biochemical system and heterotrophic bacterium and do not preponderate and be easily eliminated, in routine biochemistry treatment system, nitrobacteria proportion is often lower, to such an extent as to conventional biochemical is limited to the removal effect of nitrogen in waste water.In addition, conventional biochemical denitrogenation also have that floor space is large, organic loading high and low temperature time the deficiencies such as efficiency is low.
The deficiency lower for current biological process denitride technology efficiency, energy consumption is higher, Novel waste aquatic organism denitrification process: short-cut nitrification-denitrification technique arises.It is at theory and the framework technically breaching traditional nitrification-denitrification technique.Traditional biological denitrificaion ammonia nitrogen is completely oxidized to nitrate nitrogen to carry out denitrification again.From the microbial conversion process of nitrogen, it is by independently two differential responses completing of bacterium catalysis of two classes that ammonia-state nitrogen is oxidized to nitric nitrogen.But no matter be from NO for denitrifying bacteria 2 --N or NO 3 --N all can as final hydrogen acceptor.Thus whole biological denitrification process can pass through NH 4 +-N → NO 2 --N → N 2approach complete.So-called short distance nitration is exactly by nitrifying process control HNO 2stage and stopping, carry out denitrification subsequently.Compared with traditional nitration denitrification, short-cut nitrification and denitrification not only can save energy consumption about 25% (in oxygen), saves carbon source 40% (in methyl alcohol), and can Reaction time shorten, significantly reduces the sludge quantity of generation.
But, because ammonia oxidizing bacteria is comparatively responsive to all many condition such as pH, temperature, dissolved oxygen, sludge age, inhibitory substances, therefore, in actual moving process, be difficult to the enrichment realizing ammonia oxidizing bacteria.
Therefore, find a kind of solve ammonia oxidizing bacteria compete in conventional biochemical system and heterotrophic bacterium do not preponderate, the not enough method such as easily run off, and gives full play to the advantage that its efficiency is high, energy consumption is low, this process for middle Low Concentration Ammonia Containing Wastewater is significant.
Summary of the invention
The object of the invention is to solve ammonia oxidizing bacteria poor growth, generation cycle length, competing in conventional biochemical system and heterotrophic bacterium deficiencies such as not preponderating, easily run off, organism fluidization bed technique, using embedding immobilization microorganism technology, short-cut nitrification-denitrification combine with technique are got up, a kind of biological enhanced processing method of efficient, economic, the middle Low Concentration Ammonia Containing Wastewater that stable, excess sludge is few is provided.
Technical solution of the present invention is: adopt anoxic-aerated biological fludized bed combination process, combination microbe stuffing is filled in anoxic reacter, add using embedding immobilization microorganism carrier in aerated biological fludized bed reactor, aerated biological fludized bed has phegma to be back to anoxic pond.To be combined Low Concentration Ammonia Containing Wastewater in process by organism fluidization bed technique and using embedding immobilization microorganism technology, comprise the step of following order:
Middle Low Concentration Ammonia Containing Wastewater enters anoxic reacter after pre-treatment, utilizes the denitrifying bacterium be attached on combined stuffing to be removed by the oxynitride (being mainly nitrite nitrogen) in recirculation water, and removes partial organic substances.
Anoxic pond water outlet enters aerated biological fludized bed reactor, and the fixed microorganism carrier in reactor in fluidized be uniformly distributed in whole aerated biological fludized bed reactor, realizes fully contacting of carrier and waste water under certain aeration condition.And utilize carrier inside and epontic ammonia oxidizing bacteria, be nitrite nitrogen by the mineralized nitrogen in water, remove a part of total nitrogen and remaining organism, effluent recycling is in the anoxic pond of front end simultaneously.
The water outlet of aerated biological fludized bed reactor, through aftertreatment, is discharged after removing the pollutent indexs such as the SS in water.
Present method influent ammonium concentration is generally at 50mg/L-500mg/L, and when taking to meet this concentration conditions into means such as water dilution or reflux dilutions, present method is applicable equally.
Anoxic pond adopts combination microbe stuffing, utilizes filler to provide huge specific surface area to provide applicable habitat for the microorganism based on denitrifying bacterium, improves the impact resistance of system.
The using embedding immobilization microorganism carrier adopted in aerated biological fludized bed reactor, one or more raw materials in the macromolecule organics such as polyvinyl alcohol, sodium alginate, chitosan.
The dosage of using embedding immobilization microorganism carrier in aerated biological fludized bed reactor depending on concrete water quality, generally at 2%-30%(W/W).
Using embedding immobilization microorganism carrier is prepared from after fully being mixed by embedding colloid and microorganism, microbial profile is on whole carrier inside and surface, combine closely with carrier, carrier current vector is few, and the charge capacity of microorganism can reach more than 50mgVSS/g carrier.
Using embedding immobilization microorganism support density is at 1g/cm 3left and right, close with the density of water, particle diameter 2-5mm, is conducive to the fluid effect of carrier in reactor, reduces fluidisation energy consumption.
The ammonia oxidizing bacteria of embedding in using embedding immobilization microorganism carrier, is obtained by activated sludge culture, more can adapts to open system environment.Mineralized nitrogen in waste water is, after nitrite nitrogen, carry out denitrification denitrogenation in anoxic pond by it, realizes short-cut nitrification-denitrification effect, can save the oxygen-supplying amount of about 25%, the carbon source of about 40%, reduces reactor volume and the sludge creation amount of 30%-40%.
The present invention compared with prior art, has the following advantages:
1. adaptable, treatment effect is good.Using embedding immobilization microorganism technology make microorganism especially ammonia oxidizing bacteria be kept in fixation support, its solid retention time in biochemical system can be increased, effectively solve ammonia oxidizing bacteria poor growth in biochemical system, generation cycle long, compete in conventional biochemical system and heterotrophic bacterium problems such as not preponderating, easily run off.In addition, for the diversity of Pollutants in Wastewater, bacterial classification, from conventional biochemical system, self has diversity and stronger adaptive faculty, and it also has good removal ability to other pollutents beyond ammonia nitrogen in waste water.In addition, aerated biological fludized bed technology (ABFT) has the advantages such as specific surface area is large, contact is even, mass transfer velocity is fast, crushing is low, can improve the removal efficiency of fixed microorganism carrier to Pollutants in Wastewater.
2. the present invention has energy-saving and cost-reducing advantage.What embed in fixed microorganism carrier is mainly ammonia oxidizing bacteria, under aerobic condition, mineralized nitrogen in waste water can be nitrite nitrogen by it, the nitrite nitrogen generated is converted into nitrogen by denitrifying bacterium under anoxic conditions and is removed, compare conventional biochemical denitrogenation, decrease nitrite nitrogen and be converted into nitric nitrogen (aerobic stage) and nitric nitrogen is converted into nitrite nitrogen (anoxic phases) process, realize short-cut nitrification-denitrification effect, the oxygen-supplying amount of about 25%, the carbon source of about 40% can be saved, reduce the reactor volume of 30%-40%.
3. mud sludge output is few.Along with the increase of domestic sewage work quantity, the disposal of sewage treatment plant residual mud has become a difficult problem.Bacterial classification of the present invention is from conventional biochemical system, " can consume " excess sludge of sewage work on the one hand in process of production, on the other hand, bacterial classification grows in immobilization spheroid, autophage, excess sludge discharge amount is little, is conducive to alleviating a sludge treatment difficult problem.
4. the present invention effectively can also solve the problems such as conventional biochemical system activity mud easily expands.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
Embodiment 1
Adopt the inventive method process ammonia nitrogen simulated wastewater, water quality is as follows: ammonia nitrogen 300mg/L, COD cr500mg/L, fixed microorganism carrier is put in the aerated biological fludized bed of 1L by the dosage (W/W) according to 15%, about inlet flow-patterm=8, water temperature about 30 DEG C, dissolved oxygen about 5mg/L, when the residence time respectively at 2h, 4h, 6h, 8h time, water outlet ammonia nitrogen concentration is respectively 121.01mg/L, 71.65mg/L, 22.81mg/L, 12.65mg/L; Water outlet nitrite nitrogen concentration is respectively 82.11mg/L, 117.40mg/L, 167.13mg/L, 193.72mg/L; Effluent nitrate-nitrogen is all within 20mg/L.Ammonia nitrogen removal frank 95.7% under 8h residence-time conditions, reactor water outlet NO 2 -/ NO x -maintain more than 90%.Aerated biological fludized bed water outlet is circulated to after the anoxic pond of front end through internal reflux, NO xwithin concentration can be down to 10mg/L.
Embodiment 2
Adopt the inventive method process ammonia nitrogen simulated wastewater, water quality is as follows: ammonia nitrogen 300mg/L, COD cr500mg/L, fixed microorganism carrier is put in the aerated biological fludized bed of 1L by the dosage (W/W) according to 5%, about inlet flow-patterm=8, water temperature about 30 DEG C, dissolved oxygen about 5mg/L, when the residence time respectively at 2h, 4h, 6h, 8h, 10h time, water outlet ammonia nitrogen concentration is respectively 177.37mg/L, 120.22mg/L, 104.03mg/L, 68.68mg/L, 34.24mg/L; Water outlet nitrite nitrogen concentration is respectively 30.91mg/L, 41.78mg/L, 63.02mg/L, 100.06mg/L, 132.69mg/L; Effluent nitrate-nitrogen is all within 20mg/L.Ammonia nitrogen removal frank 88.6% under 10h residence-time conditions, reactor water outlet NO 2 -/ NO x -maintain more than 90%.Aerated biological fludized bed water outlet is circulated to after the anoxic pond of front end through internal reflux, NO xwithin concentration can be down to 10mg/L.
Embodiment 3
Adopt the inventive method process ammonia synthesizing industry waste water, water quality is as follows: ammonia nitrogen 120-300mg/L, COD cr200-400mg/L, process continuously waste water according to the scale of 100mL/h, device technique flow process is anoxic pond-aerated biological fludized bed, wherein, anoxic pond residence time 11h, aerated biological fludized bed residence time 11h, in aerated biological fludized bed, using embedding immobilization carrier dosage is 15%, at inlet flow-patterm=about 7-8, water temperature 25-35 DEG C, under dissolved oxygen 3-5mg/L condition, water outlet ammonia nitrogen concentration is 5-15mg/L, and ammonia nitrogen removal frank is more than 90%.
Embodiment 4
Adopt the inventive method process ammonia synthesizing industry waste water, water quality is identical with embodiment 3, the pilot plant of 5t/d scale is utilized to process waste water, device technique flow process is anoxic pond-aerated biological fludized bed-settling tank, wherein, anoxic pond residence time 16h, aerated biological fludized bed residence time 16h, arrange combined stuffing in anoxic pond, in aerated biological fludized bed, using embedding immobilization carrier dosage is 3%, at inlet flow-patterm=about 7-8, water temperature 25-35 DEG C, under dissolved oxygen 3-5mg/L condition, water outlet ammonia nitrogen concentration is 5-20mg/L, and ammonia nitrogen removal frank is more than 85%.In addition, adjust system additional carbon (glucose), every day, dosage was 350-450g, provided 1.06gCOD by 1g glucose crcalculate, carbon source dosage is that 74-95mg/L(is with COD crmeter), and the pH of aerated biological fludized bed is regulated without the need to volume exogenously added alkali.And every day system sludge volume be 80g over dry mud, ton sewage sludge output 0.016kg over dry mud.
Comparative example
Under the condition of water quality of embodiment 3, process waste water by A/0-MBR technique, scale is 3600t/d, wherein, A pond residence time 13.1h, O pond residence time 32.4h, membrane cisterna residence time 5.2h, system sludge concentration 6000-7000mg/L, at inlet flow-patterm=about 7-8, water temperature 25-35 DEG C, under dissolved oxygen 2-3mg/L condition, water outlet ammonia nitrogen concentration is 2-20mg/L, and ammonia nitrogen removal frank is more than 85%.In addition, adjust system additional carbon (methyl alcohol), every day, dosage was 300-400kg, provided 1.5gCOD by 1g methyl alcohol crcalculate, carbon source dosage is that 125-167mg/L(is with COD crmeter), and need volume exogenously added alkali to regulate the pH of aerated biological fludized bed, every day, caustic soda (sheet) dosage was 800-1000kg, and being converted to a ton water dosage is 0.22-0.28kg.And every day system sludge volume be 0.3 ton of over dry mud, ton sewage sludge output 0.083kg over dry mud.
As can be seen from above-described embodiment, comparative example: fixed microorganism carrier, reactor, technique three combine by the inventive method, effectively ammonia oxidizing bacteria can be maintained aerobic system, and realize short-cut nitrification-denitrification effect preferably, the ammonia nitrogen removal efficiency of waste water is improved significantly, and can reduce carbon source required when system is normally run, the dosage of alkali and excess sludge discharge amount.The method is applied to the process of middle Low Concentration Ammonia Containing Wastewater, significant.

Claims (8)

1. the biological enhanced processing method of Low Concentration Ammonia Containing Wastewater in a kind, what it is characterized in that employing is anoxic-aerated biological fludized bed technique, combination microbe stuffing is filled in anoxic reacter, add using embedding immobilization microorganism carrier in aerated biological fludized bed reactor, aerated biological fludized bed has phegma to be back to anoxic pond.
2. the biological enhanced processing method of a kind of middle Low Concentration Ammonia Containing Wastewater according to claim 1, is characterized in that influent ammonium concentration is 50mg/L-500mg/L.
3. the biological enhanced processing method of a kind of middle Low Concentration Ammonia Containing Wastewater according to claim 1, it is characterized in that preparing the raw material that using embedding immobilization microorganism carrier adopts, including, but not limited to one or more in the macromolecule organics such as polyvinyl alcohol, sodium alginate, chitosan.
4. the biological enhanced processing method of a kind of middle Low Concentration Ammonia Containing Wastewater according to claim 1, it is characterized in that using embedding immobilization microorganism carrier be by embedding colloid and microorganism fully mix after be prepared from, microbial profile whole carrier inside and surface and combine closely with carrier.
5. the biological enhanced processing method of a kind of middle Low Concentration Ammonia Containing Wastewater according to claim 1, is characterized in that the dosage of fixed microorganism carrier is depending on concrete water quality, generally at 2%-30%(W/W).
6. the biological enhanced processing method of a kind of middle Low Concentration Ammonia Containing Wastewater according to claim 1, is characterized in that the microorganism in fixed microorganism carrier is obtained by activated sludge culture, is mainly ammonia oxidizing bacteria.
7. the biological enhanced processing method of a kind of middle Low Concentration Ammonia Containing Wastewater according to claim 1, is characterized in that in aerated biological fludized bed, and fixed microorganism carrier is fluidized under the effect of air-flow, and is uniformly distributed in whole reactor.
8. the biological enhanced processing method of a kind of middle Low Concentration Ammonia Containing Wastewater according to claim 1, it is characterized in that aerated biological fludized bed has phegma to be back to anoxic pond and realizes denitrogenation of waste water, reflux ratio is 100%-500%.
CN201410217956.7A 2014-05-22 2014-05-22 Biologically enhanced treatment method for medium-and-low concentration ammonia-nitrogen wastewater Pending CN105084536A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107777769A (en) * 2016-08-31 2018-03-09 南京万德斯环保科技股份有限公司 A kind of biological reinforced type river and lake original position ecological restoring method
CN109809640A (en) * 2019-03-15 2019-05-28 宜兴国际环保城科技发展有限公司 A kind of biosystem of efficient removal total ammonia nitrogen
CN110436622A (en) * 2019-07-16 2019-11-12 江苏龙腾工程设计股份有限公司 A kind of method of the filler-reinforced biofilter of Immobilized hyphae and its sewage treatment

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107777769A (en) * 2016-08-31 2018-03-09 南京万德斯环保科技股份有限公司 A kind of biological reinforced type river and lake original position ecological restoring method
CN109809640A (en) * 2019-03-15 2019-05-28 宜兴国际环保城科技发展有限公司 A kind of biosystem of efficient removal total ammonia nitrogen
CN110436622A (en) * 2019-07-16 2019-11-12 江苏龙腾工程设计股份有限公司 A kind of method of the filler-reinforced biofilter of Immobilized hyphae and its sewage treatment

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