CN103466809A - Method for restoring groundwater nitrate pollution - Google Patents

Method for restoring groundwater nitrate pollution Download PDF

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Publication number
CN103466809A
CN103466809A CN2013104095256A CN201310409525A CN103466809A CN 103466809 A CN103466809 A CN 103466809A CN 2013104095256 A CN2013104095256 A CN 2013104095256A CN 201310409525 A CN201310409525 A CN 201310409525A CN 103466809 A CN103466809 A CN 103466809A
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China
Prior art keywords
denitrification
azotate pollution
carbon source
pollution
groundwater
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CN2013104095256A
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CN103466809B (en
Inventor
杨小毛
王波
李旭宁
刘欢
肖海云
黄鑫
梅峰
裴廷权
赵振业
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PKU-HKUST SHENZHEN-HONGKONG INSTITUTION
Shenzhen Ier Environmental Protection Engineering Technology Co Ltd
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PKU-HKUST SHENZHEN-HONGKONG INSTITUTION
Shenzhen Ier Environmental Protection Engineering Technology Co Ltd
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Abstract

The invention discloses a method for restoring groundwater nitrate pollution, which comprises the following steps: (1) throwing a modified natural slow release carbon source into groundwater polluted by nitrate; (2) supplementing denitrifying bacteria enriched liquid to the groundwater with carbon source thrown in the step (1) to carry out denitrifying treatment on the groundwater. The restoring method disclosed by the invention is low in technical cost, good in nitrate nitrogen removal effect, stable in water discharge index and is simple and free of secondary pollution.

Description

A kind of method of repairing groundwater azotate pollution
Technical field
The present invention relates to water-treatment technology field, relate in particular to a kind of method of repairing groundwater azotate pollution of utilizing.
Background technology
In recent years, the quantity discharged of industry, sanitary sewage grows with each passing day, livestock and poultry breeding industry develop rapidly and agriculture production in the amount of application of nitrogenous fertilizer constantly increase, make the natural circulation of nitrogen suffer destruction.The pollution of groundwater azotate is more and more serious.At present, the most of areas of China are subject to azotate pollution to some extent as the underground water of drinking water source, and the trend increased the weight of is year by year arranged, and indivedual regional concentration has surpassed 100mg/L.
The nitrate of Excessive Intake has a lot of harm to HUMAN HEALTH, can cause methemoglobinemia, when serious, can cause hypoxia death.And the effect such as that the inferior ammonium nitrate formed in the nitrate transformation process etc. also have is carcinogenic, teratogenesis and mutagenesis.Therefore the World Health Organization (WHO) regulation Nitrate In Drinking Water mass concentration (in N) is no more than 10mg/L, and China's " drinking water sanitary standard " (GB5749-2006) stipulates that the nitrate limit value is also 10mg/L.
The technology that mainly removes of nitrate has physical method, thing denitrogenation and chemical reduction method at present.Wherein, the required expense of physical method is too high, does not have selectivity, and the transfer of nitrate pollutants has just occurred or concentrated, and does not in fact remove up hill and dale, so the method is subject to certain restrictions in application; Although the biological denitrificaion method can thoroughly be reduced into nitrogen by nitrate, but still, as capacity of resisting impact load is low, there is secondary pollution in the shortcoming that exists some to be difficult to overcome, and complex process is not suitable on a small scale and disperses to water treatment etc.So it is extremely urgent to seek a kind of not only safe but also reliable nitrate processing scheme.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art, the object of the present invention is to provide simple, remediation efficiency is high, and there is no the method for the reparation groundwater azotate pollution of secondary pollution.
The method of reparation groundwater azotate pollution disclosed by the invention, comprise the steps:
(1), to dropping into modified natural slowly-releasing carbon source in the underground water of azotate pollution;
(2), the underground water dropped in step (1) after carbon source is supplemented to denitrification flora pregnant solution, underground water is carried out to the denitrification processing.
Carbon in described modified natural slowly-releasing carbon source and the mass concentration of the nitrogen in groundwater azotate are 2-5: 1.
Described modified natural slowly-releasing carbon source is that natural slowly-releasing carbon source is ground into to the fine particle below 2mm, then swelling 3-5h obtains, thereby makes it be easy to be hydrolyzed into monose or low sugar is utilized by microorganism.。
Described natural slowly-releasing carbon source is one or more in rice, corn, wheat, Ipomoea batatas, Chinese sorghum and fermented product thereof or deformations.
Described denitrification flora pregnant solution extracts from the active sludge of Liquor-making Enterprises & sewage work, extracting method is: add finite concentration saltpetre and glucose culture solution in the active sludge intermixture of Liquor-making Enterprises & sewage work, mix and blend 24 hours, standing rear discharge supernatant liquor, then add the nutrient solution Cyclic culture more than 10 times.
The method of reparation groundwater azotate pollution disclosed by the invention is preferably undertaken by the denitrification filtration system.
Described denitrification filtration system comprises distribution reservoir for introducing azotate pollution underground water, the denitrification filter pool of processing for the underground water denitrification be connected with distribution reservoir and the water collecting basin of complete underground water for collection and treatment be connected with denitrification filter pool, described step (1) is carried out in distribution reservoir, described step (2) is carried out in denitrification filter pool, 8, the method for reparation groundwater azotate pollution as claimed in claim 7 is characterized in that: denitrification filter pool (20) hydraulic surface loading is 3-6m 3/ (m 2d), the hydraulic detention time of denitrification diffusion cell (20) is 3-6 hour.
In described denitrification filter pool, be disposed with from the bottom to top anti seepage membrane, supporting layer, packing layer, waterflooding layer.
Be filled with filler in described packing layer, described filler is one or more in Sha, Dali, thick river chicken girt, magnetite, volcanized rock, vermiculite, thin haydite, and the particle diameter of described filler is 1-5mm, is preferably equal grain.The height of described packing layer is 0.8-1.5m,, denitrifying bacteria can adhere to and form one deck microbial film at filling surface, utilizes modified natural slowly-releasing carbon source under anoxia condition, carries out denitrification denitrogenation.
In described water collecting basin, wash-water pump is set, described wash-water pump water side is connected with denitrification filter pool (20) bottom water-in, and described wash-water pump backwash rate is 0.5-5L/ (m 2s), flush time is 1-3min, flushing cycle 1-7d.
Restorative procedure technical costs disclosed by the invention is low, the nitric nitrogen removal effect is good, and effluent index is stable, and simple, non-secondary pollution.
The accompanying drawing explanation
Fig. 1 is the present invention for the structural representation of the denitrification percolating device of repairing groundwater azotate pollution, shown in figure, label is respectively: 10, distribution reservoir, 11, intake pump, 20, denitrification filter pool, 21, anti seepage membrane, 23, packing layer, 24, waterflooding layer, 25, water-distributing device, 30, water collecting basin, 31, wash-water pump;
Fig. 2 is the water-distributing device schematic diagram; Shown in figure, label is respectively: 251, water distribution supervisor, 252, water distribution branch pipe, 253, water distributing pore.
Embodiment
Below will by specific embodiment, the present invention is described in detail.
The method of reparation groundwater azotate pollution disclosed by the invention is preferably undertaken by the denitrification filtration system.
The denitrification filtration system that method of the present invention is utilized as structure as shown in Figure 1, comprise distribution reservoir 10 for introducing azotate pollution underground water, the denitrification filter pool 20 of processing for the underground water denitrification be connected with distribution reservoir 10 and the water collecting basin 30 of complete underground water for collection and treatment be connected with denitrification filter pool 20, denitrification filter pool 20 hydraulic surface loadings are 3-6m 3/ m 2d.
Described device also is provided with for underground water suction denitrification filter pool 20 intake pumps 11 by distribution reservoir 10, described intake pump 11 is arranged in distribution reservoir 10 or is arranged between distribution reservoir 10 and denitrification filter pool 20, and the bottom water-in of the water side of described intake pump 11 and denitrification filter pool 20 is connected.
Be disposed with from the bottom to top anti seepage membrane 21, supporting layer 22, packing layer 23, waterflooding layer 24 in described denitrification filter pool 20.
Described anti seepage membrane 21 is oozed polluted underground water for preventing under sewage, is preferably the HDPE anti seepage membrane, and thickness is 0.5-2.5mm.
Described supporting layer 22 is for water distribution uniformity and prevent under filler oozing the obstruction water distributing pore, wherein is filled with pebbles or gravel, and the particle diameter of pebbles or gravel is 30-50mm, and the height of supporting layer 22 is 0.3-0.5m.
Be filled with one or more fillers in Sha, Dali, thick river chicken girt, magnetite, volcanized rock, zeolite, thin haydite in described packing layer 23.In the process of denitrification filter pool 20 steady runnings, denitrifying bacteria can adhere to and form one deck microbial film at filling surface, utilizes modified natural slowly-releasing carbon source under anoxia condition, carries out denitrification denitrogenation.
In denitrification filter pool 20, the selection of the particle diameter of packing layer 23 fillers is the key factor that affects denitrification filter pool 20 steady runnings.The height of described packing layer is 0.8-1.5m, if the particle diameter of filler is too small, the microbial film adhered to can reduce the hole of filler, causes under the sewage of waterflooding layer 24 and oozes difficulty, the device water outlet reduces, and the gas that denitrification process produces simultaneously also is difficult to permeate filtrate and discharges the water surface; But packing material size is excessive, for the specific surface area of attached growth of microorganisms can reduce, infiltration coefficient can raise greatly, and hydraulic detention time reduces, and sewage can not get effective processing.Investigator of the present invention determines that according to previous experiments running condition the particle diameter of packing layer filler is 1-5mm, and the residence time of denitrification filter pool is 3-6h.
In denitrification filter pool 20, the height of packing layer 23 is the another one factors that affect the low carbon-nitrogen ratio sewage decontamination effect improving.Generally, packing layer 23 is highly larger, and the water environment capacity of device is stronger, and hydraulic detention time is also longer, and effluent quality will be better; But packing layer 23 is higher, investment cost is also just higher.Investigator of the present invention, according to the hydraulic surface loading of device, infiltration coefficient and the denitrifying action time of filler, determines 0.8-1.5m by the thickness of packing layer.
Described waterflooding layer 24 the inside are all water, are mainly in order to catchment, and the homogenizing effluent quality water yield is convenient to discharge, and it is highly 0.1-0.3m.
Also be provided with water-distributing device 25 at the bottom of the pond of described denitrification filter pool 20, as shown in Figure 2.
Described water-distributing device 25 is arranged on described supporting layer 22 bottoms; Described water-distributing device 25 is by water distribution supervisor 251 and be and form with water distribution supervisor 251 several water distribution branch pipes 252 that " rich " font parallel equidistant distributes and forms, and each water distribution branch pipe 252 tiltedly upper 45 is spent even and is provided with several water distributing pores 253.
The interior wash-water pump 31 that arranges of described water collecting basin 30, described wash-water pump 31 water sides are connected with denitrification filter pool 20 bottom water-ins.For preventing denitrification filter pool 20 obstructions, need to adopt wash-water pump 31 regularly the filler in packing layer 23 to be rinsed, wash-down water adopts the water outlet after device is processed, and backwash rate is 1-5L/ (m 2s), flush time is 1-3min, flushing cycle 1-7d.
Below will by specific embodiment, the present invention is described in detail.
Embodiment 1: certain North Plain Region underground water that the nitrogenous fertilizer of take is excessively used is example, carries out the azotate pollution reparation.
Adopt denitrification filtration system as shown in Figure 1, by distribution reservoir 10, intake pump 11, denitrification filter pool 20, water collecting basin 30 and wash-water pump 31, formed, wherein anti seepage membrane is the HDPE anti seepage membrane, thickness is 2.0mm, and supporting layer 22 is filled with pebbles, and particle diameter is 30-50mm, the height of supporting layer 22 is 0.5m, the height of packing layer 23 is 1.0m, the natural river sand that filler is 2-3mm, and the hydraulic surface loading of denitrification filter pool is 4m 3/ m 2d, hydraulic detention time is 4h.
Concrete grammar is:
(1) add the old rice through modification in distribution reservoir 10, dosage is added by carbon-nitrogen ratio at 3: 1, and method of modifying is for to grind into the fine particle below 2mm by old rice, then swelling 3-5h.
(2) when system starts, the denitrification flora pregnant solution of being inoculated to the anoxic pond active sludge that adds certain distillery's sewage works in the denitrification diffusion cell carries out the denitrification processing, and the time is 4h.
After testing, the mean concns of this area's nitrate in groundwater surpasses 50mg/L, and after the processing of denitrification filtration system, the concentration of final outflow water nitrate is reduced to below 10mg/L.
Embodiment 2: to azotate pollution, the underground water in serious zone, farmland is repaired
Adopt denitrification filtration system as shown in Figure 1, by distribution reservoir 10, intake pump 11, denitrification filter pool 20, water collecting basin 30 and wash-water pump 31, formed, wherein anti seepage membrane is the HDPE anti seepage membrane, thickness is 2.5mm, and supporting layer 22 is filled with gravel, and particle diameter is 30-50mm, the height of supporting layer 22 is 0.3m, the height of packing layer 23 is 1.5m, the thin haydite that filler is 3-5mm, and the hydraulic surface loading of denitrification filter pool is 4m 3/ m 2d, hydraulic detention time is 6h.
Concrete grammar is:
(1) add the wheat through modification in distribution reservoir 10, dosage is added by carbon-nitrogen ratio at 5: 1, and method of modifying is for to grind into the fine particle below 2mm by wheat, then swelling 3-5h.
(2) when system starts, the denitrification flora pregnant solution of being inoculated to the anoxic pond active sludge that adds certain distillery's sewage works in the denitrification diffusion cell carries out the denitrification processing, and the time is 6h.
After testing, the mean concns of this area's nitrate in groundwater surpasses 65mg/L, and after the processing of denitrification filtration system, the concentration of final outflow water nitrate is reduced to below 20mg/L.
Certainly, the present invention preferably adopts in the denitrification filtration system in Fig. 1 of the present invention and carries out, but also can in other devices, carry out, need only two treatment steps can realizing the reparation groundwater azotate pollution and both can realize the reparation of groundwater azotate pollution.Simultaneously, denitrification flora pregnant solution of the present invention also can adopt the common denitrification flora in market, preferably adopts the denitrification flora extracted from distillery's sewage works.
Compared with prior art, the present invention has advantages of:
1, add starch based modified natural slowly-releasing carbon source in the present invention, for denitrification process provides the carbon source material of sustainable use;
2, the denitrification percolating device in the present invention is usingd microorganism as main body, and supporting layer, packing layer and waterflooding layer are set in denitrification device, jointly forms the required condition of anti-nitration reaction.
3. the denitrification percolating device residence time in the present invention is 3-6h, has guaranteed the within a short period of time of the NO in decontaminated water treatment plant water outlet effectively 3--the materials such as N, TN, economy system floor space.
In sum; although the specific embodiment of the present invention have been described in detail the present invention; but persons skilled in the art should be understood that; above-described embodiment is only the description to the preferred embodiments of the present invention; but not limiting the scope of the invention; persons skilled in the art are in the disclosed technical scope of the present invention, and the variation that can expect easily, all within protection scope of the present invention.

Claims (10)

1. a method of repairing groundwater azotate pollution, is characterized in that comprising the steps:
(1), drop into modified natural slowly-releasing carbon source in the underground water of azotate pollution;
(2), the underground water dropped in step (1) after carbon source is supplemented to denitrification flora pregnant solution, underground water is carried out to the denitrification processing.
2. repair the method for groundwater azotate pollution described in claim 1, it is characterized in that: the carbon in described modified natural slowly-releasing carbon source and the mass concentration of the nitrogen in groundwater azotate are 2-5: 1.
3. repair as claimed in claim 1 the method for groundwater azotate pollution, it is characterized in that: described modified natural slowly-releasing carbon source is that natural slowly-releasing carbon source is ground into to the fine particle below 2mm, then swelling 3-5h obtains.
4. repair as claimed in claim 3 the method for groundwater azotate pollution, it is characterized in that: described natural slowly-releasing carbon source is one or more in rice, corn, wheat, Ipomoea batatas, Chinese sorghum and fermented product thereof or deformations.
5. the method for reparation groundwater azotate pollution as claimed in claim 1, it is characterized in that: described denitrification flora pregnant solution extracts from the active sludge of Liquor-making Enterprises & sewage work.
6. the method for reparation groundwater azotate pollution as claimed in claim 1, it is characterized in that: described method is undertaken by the denitrification filtration system.
7. the method for reparation groundwater azotate pollution as claimed in claim 6, it is characterized in that: described denitrification filtration system comprises distribution reservoir (10) for introducing azotate pollution underground water, the denitrification filter pool (20) of processing for the underground water denitrification be connected with distribution reservoir (10) and the water collecting basin (30) of complete underground water for collection and treatment be connected with denitrification filter pool (20), described step (1) is carried out in distribution reservoir (10), and described step (2) is carried out in denitrification filter pool (20).
8. the method for reparation groundwater azotate pollution as claimed in claim 7, it is characterized in that: denitrification filter pool (20) hydraulic surface loading is 3-6m 3/ (m 2d), the hydraulic detention time of denitrification diffusion cell (20) is 3-6 hour.
9. the method for reparation groundwater azotate pollution as claimed in claim 7, it is characterized in that: in described denitrification filter pool (20), be disposed with from the bottom to top anti seepage membrane (21), supporting layer (22), packing layer (23), waterflooding layer (24).
10. the method for reparation groundwater azotate pollution as claimed in claim 9, it is characterized in that: described packing layer is filled with filler in (23), described filler is one or more in Sha, Dali, thick river chicken girt, magnetite, volcanized rock, vermiculite, thin haydite, the particle diameter of described filler is 1-5mm, the height of described packing layer is 0.8-1.5m, denitrifying bacteria can adhere to and form one deck microbial film at filling surface, utilizes modified natural slowly-releasing carbon source under anoxia condition, carries out denitrification denitrogenation.
CN201310409525.6A 2013-09-09 2013-09-09 A kind of method repairing groundwater azotate pollution Active CN103466809B (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104860488A (en) * 2015-06-09 2015-08-26 桂林理工大学 Method for self-removal of nitrate in underground water by virtue of rice wine in rural families
CN105347515A (en) * 2015-12-09 2016-02-24 安徽师范大学 Packing medium for permeable reactive barrier and application of packing medium to aspect of in-situ treatment on underground water nitrate pollution and method thereof
CN106187060A (en) * 2016-07-02 2016-12-07 陈毅忠 A kind of preparation method of composite anti-penetrating material
CN106986451A (en) * 2017-06-05 2017-07-28 知和环保科技有限公司 A kind of denitrification filler and its application process
CN111024910A (en) * 2018-10-09 2020-04-17 中国环境科学研究院 Method for deducing and tracing pollution source of underground water nitrate

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104860488A (en) * 2015-06-09 2015-08-26 桂林理工大学 Method for self-removal of nitrate in underground water by virtue of rice wine in rural families
CN105347515A (en) * 2015-12-09 2016-02-24 安徽师范大学 Packing medium for permeable reactive barrier and application of packing medium to aspect of in-situ treatment on underground water nitrate pollution and method thereof
CN106187060A (en) * 2016-07-02 2016-12-07 陈毅忠 A kind of preparation method of composite anti-penetrating material
CN106986451A (en) * 2017-06-05 2017-07-28 知和环保科技有限公司 A kind of denitrification filler and its application process
CN106986451B (en) * 2017-06-05 2019-07-09 知和环保科技有限公司 A kind of denitrification filler and its application method
CN111024910A (en) * 2018-10-09 2020-04-17 中国环境科学研究院 Method for deducing and tracing pollution source of underground water nitrate

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