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Zero-valent iron polyculture denitrification coupling modified charcoal two-stage PRB underground water denitrification method and reactor

A technology of biochar and denitrification, applied in chemical instruments and methods, biological water/sewage treatment, polluted groundwater/leachate treatment, etc., can solve the problems of low efficiency, slow growth rate of ferroautotrophic denitrifying Nitrogen efficiency decline and other issues

Active Publication Date: 2021-08-27
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: the use of zero-valent iron in the autotrophic denitrification of groundwater as the electron donor has a tendency of passivation and agglomeration and is easy to harden, hindering the reaction process, resulting in a decrease in denitrification efficiency; The growth rate of denitrifying bacteria is slow, and it is greatly affected by environmental factors such as water temperature and pH, high cost, low efficiency, and incomplete nitrogen removal.

Method used

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  • Zero-valent iron polyculture denitrification coupling modified charcoal two-stage PRB underground water denitrification method and reactor
  • Zero-valent iron polyculture denitrification coupling modified charcoal two-stage PRB underground water denitrification method and reactor

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Embodiment

[0031] This embodiment provides a zero-valent iron polyculture denitrification coupling modified biochar two-stage PRB groundwater denitrification method and denitrification reactor, the groundwater NO in this embodiment 3 - -N concentration is 25 ± 5.0mg / L, denitrification is carried out through a two-stage PRB groundwater denitrification method provided by this embodiment with zero-valent iron polyculture denitrification coupled with modified biochar, including the following steps:

[0032] Step 1): Set Fe wrapped in polyethylene mesh bag in the primary PRB reaction zone 0 (Iron shavings) filler, use the residual sludge of urban sewage treatment plant as seed sludge, and inoculate it into the first-level PRB reaction zone. Contains NO 3 --N groundwater is fed continuously for 10-15 days to form a biofilm with denitrifying bacteria on the surface of the iron shaving filler and complete the start-up of the first-level PRB.

[0033] Step 2): With NO 3 - -N groundwater ent...

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Abstract

The invention discloses a zero-valent iron polyculture denitrification coupling modified charcoal two-stage PRB underground water denitrification method and a reactor. The method disclosed by the invention comprises the following steps: firstly, treating groundwater containing NO3 <->-N by a primary PRB reactor filled with Fe<0> (iron shavings) filler wrapped by a polyethylene mesh bag, and carrying out denitrification by virtue of autotrophic and heterotrophic coexisting polyculture denitrifying bacteria so as to reduce most of NO3 <->-N into N2 to be removed; and then adsorbing and removing the residual NO3 <->-N through a second-stage PRB reactor provided with a modified biochar filler. According to the method, the carbon source and Fe < 0 > are added to form a polyculture denitrification nitrogen removal effect, so that the problems that zero-valent iron is easy to passivate and the growth rate of autotrophic denitrifying bacteria is low can be solved, and the method is easy to operate and manage and relatively low in operation cost.

Description

technical field [0001] The invention relates to a zero-valent iron polyculture denitrification coupled modified biochar two-stage PRB groundwater denitrification method and a reactor, belonging to the technical field of groundwater restoration. Background technique [0002] Groundwater is an important part of water resources. Due to its stable water quantity and excellent water quality, it is an important water source for agricultural irrigation, industrial production and urban life. However, industrial wastewater discharge and excessive use of agricultural chemical fertilizers and pesticides have caused widespread nitrate nitrogen pollution in groundwater. Drinking groundwater with excessive nitrate content can lead to diseases such as methemoglobinemia, liver cancer, and gastric cancer, causing great ecological environment and health risks. How to effectively reduce NO in groundwater 3 - -N, become an urgent problem to be solved at present. [0003] press NO 3 - Depe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/06C02F101/16
CPCC02F3/346C02F3/2853C02F1/283C02F2003/003C02F2103/06C02F2101/163C02F2203/004C02F2203/006C02F2209/15
Inventor 薛罡宋宾学陈红钱雅洁张艾李响高品张羽王铮曾琳贾林春徐磊王晓暖何月玲张承基于鑫孙苏阳陈钰婷陆晓峰
Owner DONGHUA UNIV
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