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Batch-type groundwater denitrifying method

A groundwater and denitrification technology, applied in chemical instruments and methods, contaminated groundwater/leachate treatment, water pollutants, etc. Pollution, good application prospects, the effect of avoiding pollution

Active Publication Date: 2010-07-28
北京铭泽源环境工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Membrane bioreactors can completely avoid the problem of microbial pollution in the groundwater denitrification process, however, membrane bioreactors still cannot effectively solve the problem of residual organic carbon sources

Method used

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  • Batch-type groundwater denitrifying method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] See attached figure 1 , a kind of intermittent groundwater denitrification denitrification method, comprises the following steps:

[0041] (1) Enrichment culture of denitrifying bacteria

[0042] Add KNO separately to each liter of distilled water 3 2000mg / L, C 2 h 5 OH 1500mg / L, CaCl 2 350mg / L, MgSO 4 ·7H 2 O 300mg / L, 0.5mL of 0.2mol / L phosphate buffer solution of pH 7.2 constitutes denitrification bacteria enrichment culture solution; Add activated sludge from urban domestic sewage treatment plant into denitrification bacteria culture solution to carry out denitrification Enrichment culture of nitrifying bacteria; ordinary stirring reactor with intermittent operation is used for stirring reaction for 20 hours a day, static sedimentation for 4 hours, and the supernatant is discharged by siphon method, and then fresh denitrifying bacteria culture solution is added for the next round of operation. Run for 70 days to get denitrifying bacteria suspension.

[0043...

Embodiment 2

[0052] A kind of intermittent groundwater denitrification denitrification method, basic steps are the same as embodiment 1, difference is (see attached figure 1 ):

[0053] Pour out the simulated groundwater 1 in the middle chamber 11 of the reactor in Example 1 and the ethanol aqueous solution 2 in the left chamber 12 and the right chamber 13, and add 900mL in the middle chamber 11 In the simulated groundwater 1, 900mL of distilled water and 60mg of 95% ethanol (the COD of ethanol aqueous solution 2) are respectively added in the left chamber 12 and the right chamber 13 Cr Concentration is about 132mg / L), repeat each step operation of embodiment 1.

[0054] After 36 hours of reaction, the NO in the intermediate chamber 11 3 - -N and COD Mn The concentrations are 8.9mg / L and 2.9mg / L respectively, that is, nitrate nitrogen and COD Mn All meet the requirements of China's "Drinking Water Sanitation Standard" (GB5749-2006). At the same time, the NO in the left chamber 12 an...

Embodiment 3

[0056] See attached figure 2 , an intermittent groundwater denitrification denitrification method, its specific operation steps are:

[0057] Steps (1) to (3) are the same as in Example 1.

[0058] (4) Construction of immobilized cell membrane bioreactor

[0059] In step (3), the surface of each plate-shaped fixed cell 3 side obtained in step (3) is covered with a microporous filter membrane 4 with a pore size of 0.45 μm, and then the plate-shaped fixed cells 3 and the microporous filter membrane 4 are fixed with flange 9 and bolts fixed together figure 2 In the shown reactor housing 5, a flat plate-shaped fixed cell bioreactor is obtained.

[0060] (5) Groundwater denitrification and denitrification

[0061] use NaNO 3 Prepare with distilled water The simulated groundwater 1, in figure 2 900mL simulated groundwater is respectively added in the left side chamber 12 and the right side chamber 13 of the shown reactor, and 900mL distilled water and 130mg 95% ethanol ar...

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Abstract

The invention relates to the technical field of safety of drinking water, in particular to a method for denitrifying groundwater by combining membrane separation technique and cell immobilization technique. The method comprises the following steps:(1) enrichment culture of denitrifying bacteria; (2) preparation of polyvinyl alcohol solution; (3) preparation of tabular immobilized cells; (4) construction of the immobilized cell membrane bioreactor; and (5) denitrification of groundwater. During the denitrification of groundwater, groundwater and ethanol water solution are respectively added into different chambers of the immobilized cell membrane bioreactor, and a stirrer is opened to carry out denitrification; and the reaction is stopped when the concentration of nitrate nitrogen in the groundwater conforms to the nitrate limit value (NO3--N is smaller than or equal to 10 mg / L) set in Sanitary Standard for Drinking Water (GB5749-2006) in China. The invention has the advantages that the method can prevent the groundwater from being polluted by denitrifying bacteria and effectively prevent the denitrification residual organic carbon source from polluting the groundwater, thereby ensuring the safety of drinking water. Thus, the invention has excellent application prospects.

Description

【Technical field】 [0001] The invention relates to the technical field of using a biochemical method to ensure the safety of drinking water for human beings, in particular, it relates to a method for preparing drinking water by denitrification and denitrification of groundwater polluted by nitric acid. 【technical background】 [0002] Now, water shortage is a worldwide problem, and the protection of water resources is something that the whole world is working hard for. Because rivers and lakes are polluted to varying degrees or surface water resources are insufficient, many countries and regions regard groundwater as an important source of drinking water. [0003] However, due to the unreasonable use of chemical fertilizers, the pollution of groundwater by nitrates has become a fairly common phenomenon. In some countries and regions, the pollution of nitrates has been quite serious, and there is a trend of worsening. Because nitrates are easily reduced to nitrites after enter...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F3/34C02F3/10C02F1/44C02F101/16C02F103/06
CPCY02W10/10
Inventor 曹国民张立辉盛梅黄海苏刘勇弟褚晨佳陈燕昌张麟
Owner 北京铭泽源环境工程有限公司