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Groundwater nitrate pollution remediation technology based on semi-inert solid-phase carbon source carrier

A solid-phase carbon source and pollution remediation technology, applied in water pollutants, water/sludge/sewage treatment, chemical instruments and methods, etc., to achieve the effects of solving the lack of carbon sources, good microbial carrier performance, and improving denitrification efficiency

Inactive Publication Date: 2010-11-10
王鹤立
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiency of existing groundwater nitrate pollution bioremediation technology, the present invention proposes a groundwater nitrate pollution bioremediation technology based on a semi-inert solid-phase organic carbon source carrier, which can be used in the in-situ or ex-situ restoration of groundwater nitrate pollution. The semi-inert solid-phase organic carbon source carrier is used as the filling medium, so that nitrate pollution can be effectively repaired through biological denitrification

Method used

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Examples

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Embodiment 1

[0011] In situ bioremediation PRB process of groundwater nitrate pollution based on semi-inert solid-phase organic carbon source carrier. Canadian Hat Creak (place of origin) lignite that has been oxidized with nitric acid and microwaved was used as the PRB filling medium, and a reaction wall was built perpendicular to the groundwater flow downstream of the polluted plume. The reaction wall was 2.5m wide and 6.0m deep. In the early stage of operation, the bacteria solution of coal-dissolving bacteria and denitrifying bacteria is introduced into the surface of the filling medium of the reaction wall to form a biofilm. The nitrate content in the groundwater is 48mg / L, the flow rate of the groundwater is 9cm / d, and the hydraulic retention time is 240h. Arrange detection holes at 0.5 meters upstream and downstream of PRB, and also set detection holes in PRB. After the operation is stable, it is tested that the method is effective in removing nitrate, and the removal rate can reac...

Embodiment 2

[0013] Ex-situ bioremediation infiltration tank process for groundwater nitrate pollution based on semi-inert solid-phase organic carbon source carrier. The modified lignite is used as the filter material, and the denitrifying bacteria and coal-dissolving bacteria are introduced into the filter material layer to cultivate and hang the film. The thickness of the filter layer is 2.5m, and the hydraulic retention time is 12h. The groundwater polluted by nitrate is pumped into the top of the infiltration tank through the intake well, and then evenly distributed through the water distribution pipe. Influent nitrate concentration is 55mg / L. After a period of stable operation, it is detected that the nitrate removal rate is between 85% and 89%, and the nitrate concentration after treatment can be stably lower than 10mg / L, reaching the standard of safe drinking water.

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PUM

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Abstract

A biological denitrification method is a most economical and effective groundwater nitrate pollution remediation method which is put into use currently, but has the problems of denitrification carbon source shortage, poor carbon source controlled release, easily-caused secondary pollution, and the like. Aiming at the problems, the invention provides a groundwater nitrate pollution bioremediation technology based on a semi-inert solid-phase organic carbon source carrier, which can provide a long-acting organic carbon source at the same time of taking as a denitrification bacteria carrier by utilizing the semi-inert solid-phase organic carbon source carrier as a filling medium in the groundwater nitrate pollution in-situ or ectopic remediation, ensures that the nitrate denitrification reaction can be fully finished and the groundwater nitrate pollution can be remediated economically with high efficiency and provides a powerful guarantee for groundwater safety drinking.

Description

technical field [0001] The invention relates to a groundwater nitrate polluted bioremediation technology based on a semi-inert solid-phase organic carbon source carrier, and belongs to the technical field of groundwater pollution restoration. Background technique [0002] 68% of the fresh water sources suitable for drinking on the earth are groundwater, and about 50% of the world's population uses groundwater as their drinking water source. However, whether in industrially developed countries or developing countries, due to the discharge and leakage of domestic sewage and industrial wastewater, the application of a large number of chemical fertilizers and pesticides in rural areas, the leaching and infiltration of fecal garbage and solid waste, atmospheric nitrogen oxides Wet and dry deposition, as well as unreasonable recharge of sewage, etc., lead to an upward trend in the concentration of nitrate nitrogen in groundwater, and become an important environmental problem. [...

Claims

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Application Information

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IPC IPC(8): C02F3/28C02F101/16
Inventor 李頔姜廷亮王鹤立
Owner 王鹤立
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