Method for in-situ or ex-situ remediation of groundwater nitrate pollution by utilization of wheat straws

A wheat straw, ectopic repair technology, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of polluting the surrounding atmosphere, destroying beneficial components and microbial flora, wheat straw Waste and other problems, to achieve the effect of small footprint, avoiding secondary pollution, and simplifying biological treatment units

Inactive Publication Date: 2012-06-13
HENAN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Wheat is the main crop in northern my country. Traditionally, open-air burning of wheat straw is used, which not only pollutes the surrounding atmosphere, but also destroys the beneficial components and microbial flora in the farmland due to burning, and is also a waste of biomass energy-wheat straw.

Method used

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  • Method for in-situ or ex-situ remediation of groundwater nitrate pollution by utilization of wheat straws
  • Method for in-situ or ex-situ remediation of groundwater nitrate pollution by utilization of wheat straws
  • Method for in-situ or ex-situ remediation of groundwater nitrate pollution by utilization of wheat straws

Examples

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Effect test

Embodiment 1

[0023] A wheat straw reaction wall was set up on the inflow and outflow paths of groundwater in a farmland area with serious nitrate pollution, in which: the weight ratio of wheat straw and its pretreatment products to sand and soil was 0.5; the amount of microorganisms added was 0.5g / g (dry straw ); the amount of cellulase added was 40U / g (dry straw), and the nitrate nitrogen content in the influent was 40mg / L. After passing through the 20cm thick reaction wall filled with sand and wheat straw, the nitrate nitrogen concentration in the effluent decreased to 5mg / L.

Embodiment 2

[0025] Establish an ectopic denitrification reactor, which is in the shape of a cylinder, and the column is filled with wheat straw. The amount of microorganisms added is 1g / g (dry straw); the amount of cellulase added is 30U / g (dry straw). The concentration of nitrate nitrogen in the effluent is 30mg / L, the lower part of the reactor enters water, and the upper part effluents. The reactor start-up time is 20 days. When the hydraulic retention time is 2h, the concentration of nitrate nitrogen in the effluent is reduced to 3mg / L, and no nitrite is detected in the effluent. .

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Abstract

A method for in-situ or ex-situ remediation of groundwater nitrate pollution by utilization of wheat straws is characterized in that wheat straws and / or pretreatment products of the wheat straws are taken as denitrification carbon source, and under the action of denitrifying bacteria flora, the contaminant (namely, nitrate nitrogen) in groundwater is removed through biological denitrification. The method provided by the invention has the advantages that on one hand, wheat straws and other agricultural waste are recycled, and on the other hand, nitrate pollution of groundwater can be eliminated. The invention belongs to the field of application of water treatment technology; carbon source does not need to be supplemented additionally; a biological treatment unit is simplified; the method can be used for in-situ remediation as well as for building an extraction type ex-situ remediation reactor; and the reaction rate is high, and less secondary pollution is caused.

Description

technical field [0001] The invention relates to an in-situ or / and ex-situ removal method for nitrate nitrogen in water, belonging to the application field of water treatment technology. The present invention is characterized in that wheat stalks or / and pretreated products thereof are used as denitrification carbon sources, and pollutant nitrate nitrogen in groundwater is removed through biological denitrification under the action of denitrification bacterial flora. The invention does not need additional liquid carbon source, the biological treatment unit is simplified, can be used for in-situ repair, and can also establish a pull-out hetero-site repair reactor, with fast reaction speed and less secondary pollution. technical background [0002] With the large-scale application of artificial nitrogen fertilizers in modern agriculture and the emergence of large-scale artificial nitrogen fixation activities (such as industrial nitrogen fixation), the nitrogen fixation capacity ...

Claims

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Application Information

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IPC IPC(8): C02F3/34C02F3/28
Inventor 万东锦刘永德王宁陈静张迎明孙旭镯李波刘文举
Owner HENAN UNIVERSITY OF TECHNOLOGY
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