CN101200332A - Method for removing nitrate nitrogen from aquaculture water - Google Patents
Method for removing nitrate nitrogen from aquaculture water Download PDFInfo
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- CN101200332A CN101200332A CNA2006101194917A CN200610119491A CN101200332A CN 101200332 A CN101200332 A CN 101200332A CN A2006101194917 A CNA2006101194917 A CN A2006101194917A CN 200610119491 A CN200610119491 A CN 200610119491A CN 101200332 A CN101200332 A CN 101200332A
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Abstract
The invention relates to a method of removing nitrate in aquaculture water, relating to treat aquaculture water. The invention comprises a sulfur autotrophic denitrification and biodegradation polymer carbon source heterotrophic denitrification device, the invention is characterized in that: the sulfur autotrophic denitrification section and the biodegradation polymer carbon source heterotrophic section are series-connected from up to down according to the proportion of 1:1 to form a denitrifying device; after the integrated denitrifying device forms film, the aquaculture water enters from the water inlet of the lower part of the integrated denitrifying device, and flows through the filling layer of the sulfur autotrophic denitrification section from up to down to remove partial nitrate, the remained nitrate in the aquaculture water and the sulfate anion generated in the process of the sulfur autotrophic denitrification section enter the filling layer of the biodegradation polymer carbon source heterotrophic section, so as to remove the remained nitrate in the aquaculture water and also generate gaseous nitrogen, the reducing bacteria of the sulfate reduces the sulfate anion to hydrogen sulfur; the treated aquaculture water flows out from the water outlet of the lower part of the integrated denitrifying device; the gaseous nitrogen and hydrogen sulfur are exhausted from exhaust opening.
Description
Technical field:
The present invention relates to the aquaculture water treatment, especially remove the method and apparatus of nitric nitrogen in the cyclic culture water.
Background technology
Bio-filter technology is the core technology of aquarium and circulating water culture system water treatment.At present, the nitrated type biofilter of configuration is oxidized to nitric nitrogen with ammonia nitrogen and nitrite nitrogen in aquarium and the circulating water culture system water technology, causes that nitric nitrogen runs up to higher concentration in the cultivating system, usually up to more than the 100mg/L.Although nitric nitrogen is lower than ammonia nitrogen and nitrite nitrogen to the toxicity of culturing object, but the high density nitric nitrogen also can influence the growth of culturing object, cause the speed of growth to slow down, surviving rate reduces, immunity degradation, and the nitric nitrogen of intermediate concentration (700-1400 μ mol/L) also can influence the tissue development of culturing object, cause physique to die down even death, studies show that, in aquarium and circulating water culture system, nitric nitrogen concentration in the cyclic culture water should be controlled at the safe concentration scope below the 50mg/L.
The common method of removing nitric nitrogen in the water mainly contains ion exchange method, membrane separation process, biological denitrification method, hydroponic plant method etc.The biological denitrification method is considered to optimum cyclic culture water method of denitration, but carbon-nitrogen ratio is lower than 1 in the cyclic culture water, and in default of enough nutrition sources and suitable working condition, denitration efficiency is very limited.Common heterotrophic denitrification need add organic carbon source such as methyl alcohol or solid carbon source such as cotton, rice husk to improve carbon-nitrogen ratio, organic carbon sources such as interpolation methyl alcohol exist cost height, additive to have risk, needs configuration aftertreatment device to culturing object, thereby can not be used for cycle of treatment breed water; Solid carbon source such as cotton, rice husk also because exist the carbon release efficiency low, easily pollute factor such as effluent quality and not selected.The hydroponic plant method is difficult to promote the use of because floor space is big, efficient is low.
The autotrophic denitrification method is divided into sulphur autotrophic denitrification and hydrogen autotrophic denitrification two classes.The hydrogen autotrophic denitrification can not produce the negative product of any reaction, but because external source hydrogen supply explosive and cost are higher, and the electrolytic hydrogen production power consumption cost is higher, increases the enterprise operation cost, so the application of hydrogen autotrophic denitrification in the cyclic culture water treatment is very limited.Optionally remove nitrate in the water with sulphur as the autotrophy source, and cost is lower, economical convenient.But the defective of this method maximum is the sulphur that adds is oxidized to sulfate radical, causes sulphate content increase in the water outlet; And can cause H in the water outlet
+Raise, the pH value descends, and influences the nitrification efficiency of nitrated biofilter in the cultivating system.Add biodegradable polymers (BDPs) separately and carry out heterotrophic denitrification, still have the low problem of solid carbon source release efficiency, seriously restrict the raising of denitrification efficient as carbon source.
Summary of the invention
The objective of the invention is to overcome existing method defective, utilize biodegradable polymers carbon source heterotrophic denitrification and sulphur autotrophic denitrification, set up a kind of integrated reactor, and in same device, realize the method for nitric nitrogen in the removal cyclic culture water of sulphur autotrophic denitrification and biodegradable polymers carbon source heterotrophic denitrification.
The present invention includes and adopt sulphur autotrophic denitrification, biodegradable polymers carbon source heterotrophic denitrification device, it is characterized in that sulphur autotrophic denitrification section and biodegradable polymers carbon source heterotrophic denitrification section 1: 1 by volume integrated sulphur autotrophic denitrification of arranged in series and biodegradable polymers carbon source heterotrophic denitrification denitrification apparatus from bottom to top; After treating that the integrated denitrification apparatus biofilm of sulphur autotrophic denitrification-biodegradable polymers carbon source heterotrophic denitrification is finished, pending cyclic culture water enters from the lower water inlet of integrated denitrification apparatus, hydraulic detention time is 6h, culture the flow through sulphur/limestone filler layer of sulphur autotrophic denitrification section of water from bottom to top, described sulphur/limestone filler layer is 1: 2 ratio uniform mixing preparation by volume by sulfur granules and Wingdale, in described sulphur/limestone filler layer, thiobacillus denitrificans is that electron donor carries out autotrophic denitrification with the elemental sulfur, remove the part nitric nitrogen, and the generation gaseous nitrogen, Wingdale balance basicity; The sulfate radical that produces in remaining nitric nitrogen and the sulphur autotrophic denitrification process in the breed water enters biodegradable polymers carbon source heterotrophic denitrification section together, described biodegradable polymers carbon source heterotrophic denitrification section filled biodegradable polymkeric substance carbon source filler and zeolite filler layer, described biodegradable polymers carbon source filler and zeolite filler layer are with polyvinyl alcohol (PVA), poly butylene succinate (PBS) is carbon source and biological attachment carrier, be propping material with the zeolite and adhere to carrier, polyvinyl alcohol, poly butylene succinate, zeolite is 2: 3: 5 ratio uniform mixing preparation by volume, in described biodegradable polymers carbon source filler and zeolite filler layer, the heterotrophic denitrification bacterium will be cultured residue nitric nitrogen removal in the water, and the generation gaseous nitrogen, sulphate reducing bacteria is reduced into hydrogen sulfide with sulfate radical; Breed water after the processing flows out from the top water outlet of integrated denitrification apparatus; Gaseous nitrogen that produces in the reaction process and hydrogen sulfide etc. are discharged from venting port.
The present invention combines biodegradable polymers carbon source heterotrophic denitrification and two kinds of processes of sulphur autotrophic denitrification, have stable effluent quality, the easy advantage of operating mode control, efficient, the miniaturization of cyclic culture denitrogenation of water device have been realized, compare with existing treatment process, have no side effect though hydroponic plant is efficient, but be difficult to realize equipmentization, and floor space is bigger, gets up to exist certain degree of difficulty so promote; All there is byproduct of reaction in the treat effluent of the heterotrophic denitrification device of liquid carbon sources such as independent sulphur autotrophic denitrification or interpolation methyl alcohol, there is risk in these byproducts of reaction to culturing object, and the present invention is with autotrophic denitrification and heterotrophic denitrification combination, and adopt the biodegradable polymers (BDPs) that can discharge safe carbon source as solid carbon source, farthest reduced the side effect of reaction.
Description of drawings
What accompanying drawing was represented is the device synoptic diagram that present method adopts.
Embodiment
Purification mechanism of the present invention is when cyclic culture current during through sulphur/limestone filler layer, thiobacillus denitrificans is that electron donor carries out autotrophic denitrification with the elemental sulfur, with the nitrate-nitrogen reduction of culturing in the water is nitrogen, produce reaction product such as a small amount of sulfate radical simultaneously, Wingdale can further improve aquaculture water basicity in the basicity that compensation thiobacillus denitrificans autotrophic denitrification is consumed; When the breed water of the sulfate radical that produces in containing residue nitric nitrogen and sulphur autotrophic denitrification process enters BDPs carbon source filler and zeolite filler layer, the heterotrophic denitrification bacterium will be cultured residue nitric nitrogen removal in the water, and the generation gaseous nitrogen, sulphate reducing bacteria is reduced into hydrogen sulfide with sulfate radical; Because it is the process that a basicity increases that sulphate reducing bacteria is removed vitriol, in the basicity that adds the Wingdale compensation, the pH value of culturing water is increased, the gas that produces in the reaction process can be discharged with gaseous form.After sulphur autotrophic denitrification section and the series operation of biodegradable polymers carbon source heterotrophic denitrification section, shorten the treatment time, reduced unit scale, reduced processing cost, effect stability is reliable.
Implementing sulphur autotrophic denitrification-biodegradable polymers carbon source heterotrophic denitrification decontamination cycle breed water at first carries out the biofilm cultivation, promptly cultivates the sufficient amount bacterium.Biofilm is carried out in two stages, at first sulphur autotrophic denitrification section 3 is carried out the biofilm cultivation of thiobacillus denitrificans, inoculates the thiobacillus denitrificans of sufficient amount in the sulphur autotrophic denitrification section 3, and adds the nutrient solution by following formulated, and concrete nutrient solution prescription is: Na
2S
2O
35H
2O (5g/L), K
2HPO
4(2g/L), KNO
3(2g/L), NaHCO
3(1g/L), MgCL
2.6H
2O (0.5g/L), FeSO
4.7H
2O (0.01g/L).Cultivate about 25-28 ℃ of water temperature, finish through 2 all left and right sides thiobacillus denitrificans biofilms approximately.Thereafter, carrying out the biofilm of biodegradable polymers carbon source heterotrophic denitrification section cultivates, inoculated bacteria adopts the biological activity mud of the municipal sewage sludge digester of cultivating through domestication, finishes through about 2 all left and right sides biodegradable polymers carbon source heterotrophic denitrification section biofilms.After treating that integrated denitrification apparatus 10 biofilms of sulphur autotrophic denitrification-biodegradable polymers carbon source heterotrophic denitrification are finished, can begin normal water inlet.Pending cyclic culture water enters from the lower water inlet 1 of sulphur autotrophic denitrification-integrated denitrification apparatus 10 of biodegradable polymers carbon source heterotrophic denitrification, hydraulic detention time is 6h, culture water behind water distribution board 2 water distribution uniformities, sulphur/limestone filler the layer 4 of the sulphur autotrophic denitrification section 3 of flowing through from bottom to top, in described sulphur/limestone filler layer 4, thiobacillus denitrificans is that electron donor carries out autotrophic denitrification with the elemental sulfur, removes the part nitric nitrogen, and the generation gaseous nitrogen, Wingdale balance basicity; The sulfate radical that produces in remaining nitric nitrogen and the sulphur autotrophic denitrification process in the breed water enters biodegradable polymers carbon source filler and the zeolite filler layer 6 in the biodegradable polymers carbon source heterotrophic denitrification section 5 together, in described biodegradable polymers carbon source filler and zeolite filler layer 6, the heterotrophic denitrification bacterium will be cultured residue nitric nitrogen removal in the water, and the generation gaseous nitrogen, sulphate reducing bacteria is reduced into hydrogen sulfide with sulfate radical.Breed water after the processing is behind water outlet baffle plate 7, from top water outlet 9 outflows of sulphur autotrophic denitrification-integrated denitrification apparatus 10 of biodegradable polymers carbon source heterotrophic denitrification.Gaseous nitrogen that produces in the reaction process and hydrogen sulfide etc. are discharged from venting port 8.
When needs blowdown mud, stop into water, the backwash water inlet enters from top water outlet 9, and biodegradable polymers carbon source filler and zeolite filler layer 6 and the sulphur/limestone filler layer 4 of flowing through is discharged from the backwash water outlet then.
Following table is present method to cyclic culture water purification effect:
The average removal rate of nitric nitrogen and nitrite nitrogen is respectively 93.1% and 99.5% in the cyclic culture water, and basicity, pH value and sulfate radical rise to some extent, but all has no side effect to culturing object.
Claims (2)
1. remove the method for culturing nitric nitrogen in the water, adopt sulphur autotrophic denitrification, biodegradable polymers carbon source heterotrophic denitrification device, it is characterized in that sulphur autotrophic denitrification section and biodegradable polymers carbon source heterotrophic denitrification section were connected into integrated denitrification apparatus in 1: 1 by volume from bottom to top; After integrated denitrification apparatus biofilm is finished, pending cyclic culture water enters from the lower water inlet of integrated denitrification apparatus, hydraulic detention time 6h, culture the flow through sulphur/limestone filler layer of sulphur autotrophic denitrification section of water from bottom to top, sulphur/limestone filler layer is by sulfur granules and 1: 2 by volume ratio uniform mixing of Wingdale, thiobacillus denitrificans is that electron donor carries out autotrophic denitrification with the elemental sulfur in sulphur/limestone filler layer, remove the part nitric nitrogen, and the generation gaseous nitrogen, Wingdale balance basicity; The sulfate radical that produces in remaining nitric nitrogen and the sulphur autotrophic denitrification process in the breed water enters biodegradable polymers carbon source heterotrophic denitrification section together, biodegradable polymers carbon source heterotrophic denitrification section filled biodegradable polymkeric substance carbon source filler and zeolite filler layer, biodegradable polymers carbon source filler and zeolite filler layer are with polyvinyl alcohol, poly butylene succinate is carbon source and biological attachment carrier, be propping material with the zeolite and adhere to carrier, polyvinyl alcohol, poly butylene succinate, 2: 3: 5 by volume ratio uniform mixing of zeolite, in biodegradable polymers carbon source filler and zeolite filler layer, the heterotrophic denitrification bacterium will be cultured residue nitric nitrogen removal in the water, and the generation gaseous nitrogen, sulphate reducing bacteria is reduced into hydrogen sulfide with sulfate radical; Breed water after the processing flows out from the top water outlet of integrated denitrification apparatus, and the gaseous nitrogen and the hydrogen sulfide that produce in the reaction process are discharged from venting port.
2. the method for nitric nitrogen in the water is cultured in removal according to claim 1, it is characterized in that adding by Na in the sulphur autotrophic denitrification section
2S
2O
35H
2O (5g/L), K
2HPO
4(2g/L), KNO
3(2g/L), NaHCO
3(1g/L), MgCL
2.6H
2O (0.5g/L), FeSO
4.7H
2O (0.01g/L) prepared culture is cultivated 25-28 ℃ of water temperature.
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Cited By (37)
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| CN101343114A (en) * | 2008-08-16 | 2009-01-14 | 王光玉 | Biological denitrification method for wastewater of industrial cultivation |
| CN101962224A (en) * | 2010-10-15 | 2011-02-02 | 上海交通大学 | Device for removing nitrogen through bio-autotrophic denitrification |
| CN101643273B (en) * | 2009-08-28 | 2011-04-27 | 天津市农业资源与环境研究所 | Device and method applicable to anaerobic treatment of solid and liquid mixed sewage of breeding field |
| CN101555088B (en) * | 2009-05-15 | 2011-08-24 | 李华林 | Method for treating black-odor rivers and lakes with microbiological preparations |
| CN102267760A (en) * | 2011-07-07 | 2011-12-07 | 清华大学 | Reactor and method for simultaneously removing nitrate and farm chemical from underground water |
| CN102424484A (en) * | 2011-11-10 | 2012-04-25 | 大连艺高水处理技术有限公司 | Sewage treatment material |
| CN102603064A (en) * | 2012-04-01 | 2012-07-25 | 南京大学 | Method for synchronously removing nitrogen and phosphorus in sewage containing nitrogen and phosphorus |
| CN102923854A (en) * | 2012-11-06 | 2013-02-13 | 沈阳建筑大学 | Method regarding wood chips as carbon source and for removing nitrate in underground water by using solid-phase heterotrophy and sulfur autotrophic integrated denitrification |
| CN103058392A (en) * | 2013-01-29 | 2013-04-24 | 上海交通大学 | Method and device removing nitrates from water body by single-stage autotrophic denitrification |
| CN103232117A (en) * | 2013-04-15 | 2013-08-07 | 湖北大学 | Low carbon nitrogen ratio micro contaminated water nitrogen removal method |
| CN103408129A (en) * | 2013-08-19 | 2013-11-27 | 中国水产科学研究院渔业机械仪器研究所 | Degradable bio-compatible water treatment filler and preparation method thereof |
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| CN106396097A (en) * | 2016-11-22 | 2017-02-15 | 南京大学宜兴环保研究院 | Autotrophic/heterotrophic denitrification-based integrated nitrogen removal apparatus and nitrogen removal method thereof |
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