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A reactor and method for simultaneously removing nitrate and pesticides in groundwater

A reactor and nitrate technology, applied in the field of reactors for simultaneous removal of nitrate and pesticides in groundwater, can solve the problem of high cost and achieve the effect of removal and promotion of biodegradation

Inactive Publication Date: 2011-12-07
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The efficiency of pure biodegradation is limited by the low concentration of nutrients in groundwater, while other physicochemical methods are costly

Method used

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  • A reactor and method for simultaneously removing nitrate and pesticides in groundwater
  • A reactor and method for simultaneously removing nitrate and pesticides in groundwater
  • A reactor and method for simultaneously removing nitrate and pesticides in groundwater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The raw water to be treated is groundwater in the Changping campus of Tsinghua University, adding NaNO 3 And 2,4-D (2,4-dichlorophenoxyacetic acid) to make their concentrations 50mg / L and 3.1μg / L, respectively. Follow the steps below to remove nitrogen and pesticides:

[0022] (1) Start-up of the reactor

[0023] Fill the PBS particles in the packed bed of the reactor, the filling height is three-quarters of the height of the reactor, the upflow type water is taken, and the activated sludge from the aeration tank of the sewage treatment plant is taken and added to the raw water containing nitrate In the tank, the denitrifying microorganisms are domesticated and enriched, and the temperature of domestication is 30℃. When the nitrate concentration of the effluent in the effluent tank is in a stable state, the domestication is completed, and the pH is adjusted to 7.5;

[0024] (2) Denitrification and nitrogen removal while removing pesticides

[0025] After the acclimatization, s...

Embodiment 2

[0030] The raw water to be treated is groundwater in the Changping campus of Tsinghua University, adding NaNO 3 And 2,4-D (2,4-dichlorophenoxyacetic acid) to make their concentrations 100mg / L and 3.1μg / L, respectively. Follow the steps below to remove nitrogen and pesticides:

[0031] (1) Start-up of the reactor

[0032] Fill the PBS particles in the packed bed of the reactor, the filling height is three-quarters of the height of the reactor, the upflow type water is taken, and the activated sludge from the aeration tank of the sewage treatment plant is taken and added to the raw water containing nitrate In the tank, the denitrifying microorganisms are domesticated and enriched, and the temperature of domestication is 15℃. After the nitrate concentration of the effluent in the effluent tank is in a stable state, the domestication is completed, and the pH is adjusted to 7.5;

[0033] (2) Denitrification and nitrogen removal while removing pesticides

[0034] After the acclimatization,...

Embodiment 3

[0039] The raw water to be treated is groundwater in the Changping campus of Tsinghua University, adding NaNO 3 And 2,4-D (2,4-dichlorophenoxyacetic acid) to make the concentration of 50mg / L and 5.3μg / L respectively. Follow the steps below to remove nitrogen and pesticides:

[0040] (1) Start-up of the reactor

[0041] Fill the PBS particles in the packed bed of the reactor, the filling height is three-quarters of the height of the reactor, the upflow type water is taken, and the activated sludge from the aeration tank of the sewage treatment plant is taken and added to the raw water containing nitrate In the tank, the denitrifying microorganisms are domesticated and enriched, and the temperature of domestication is 40℃. When the nitrate concentration of the effluent in the effluent tank is in a stable state, the domestication is completed, and the pH is adjusted to 7.5;

[0042] (2) Denitrification and nitrogen removal while removing pesticides

[0043] After the acclimatization, th...

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Abstract

The invention discloses a reactor and a method for simultaneously removing nitrate and pesticides in groundwater, which belong to the technical field of environmental protection. The reactor is composed of a water inlet tank, a cross-flow pump, a packed bed, and a water outlet tank connected in sequence. The method of the present invention uses the water-insoluble biodegradable polymer as the carbon source of denitrifying microorganisms and the biofilm carrier at the same time, and relies on the adsorption and concentration of solid carbon sources and the degradation of microorganisms in the biofilm while denitrifying and denitrifying role in the removal of pesticides.

Description

Technical field [0001] The invention belongs to the technical field of environmental protection, and specifically relates to a reactor and a method for simultaneously removing nitrate and pesticides in groundwater. Background technique [0002] Of the fresh water available for human use on the earth, 68% is groundwater. About 50% of the world's population uses groundwater as a source of drinking water. There are more than 300 cities in my country exploiting groundwater as the source of urban water supply, especially in many cities and villages in the dry and semi-arid areas of the north, where groundwater is the only source of water. However, the pollution of groundwater is increasing day by day, and one of the prominent problems is that due to the large-scale use of chemical fertilizers and pesticides in agriculture, the groundwater has been polluted by nitrates and pesticides. [0003] my country’s latest "Drinking Water Hygiene Standard" (GB5749-2006) has adjusted the upper li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28
Inventor 王建龙王旭明胡俊
Owner TSINGHUA UNIV
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