Packing medium for permeable reactive barrier and application of packing medium to aspect of in-situ treatment on underground water nitrate pollution and method thereof

A technology of infiltrating reaction walls and filling media, which is applied in the fields of water pollutants, chemical instruments and methods, and contaminated groundwater/leachate treatment, etc. and other problems, to achieve the effect of low operation and management, low cost and little secondary pollution

Active Publication Date: 2016-02-24
四川发展环境科学技术研究院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is also a collection of various materials, denitrifying bacteria and buffer solutions, and the production and preservation are relatively cumbersome.
[0008] The Chinese patent CN102923854A published on February 13, 2013 discloses a method for removing nitrate in groundwater through solid-phase heterotrophy and sulfur autotrophy integrated denitrification using wood chips as a carbon source, but the wood chips carbon source used in this invention will The chroma of the effluent is high, so it is not suitable to deal with the nitrate pollution in the groundwater used as drinking water source

Method used

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  • Packing medium for permeable reactive barrier and application of packing medium to aspect of in-situ treatment on underground water nitrate pollution and method thereof

Examples

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Embodiment 1

[0038] use figure 1 In the water treatment system, a homogeneous mixture of polyhydroxyalkanoate and ceramsite is filled in the R1 biological packed bed reactor as a treatment group, and the particle diameters of the polyhydroxyalkanoate and the ceramsite are respectively 4 to 6.5mm and 5-8mm, the mass ratio of the two is 100:2817; ceramsite is filled in the R2 biological packed bed reactor as the control group, the filling height is 40cm, and the effective volume is 1567ml. When the concentration of nitrate nitrogen in the influent is in the range of 44.75-54.4mg / L and the hydraulic retention time (HRT) is 5.2h, the water outlet of the bioreactor R1 in the start-up operation phase (3d, 4d, 6d, 9d, 11d) Sampling of effluent from S1, S2, S3, S4 and S4 outlet of bioreactor R2, analysis and determination of nitrate nitrogen concentration and pH value.

[0039] It was found that after 11 days of operation, the concentration of nitrate nitrogen in each outlet of the treatment grou...

Embodiment 2

[0041] use figure 1 In the water treatment system, a homogeneous mixture of polyhydroxyalkanoate and ceramsite is filled in the R1 biological packed bed reactor as a treatment group, and the particle diameters of the polyhydroxyalkanoate and the ceramsite are respectively 4 to 6.5mm and 5-8mm, the mass ratio of the two is 100:2817; ceramsite is filled in the R2 biological packed bed reactor as the control group, the filling height is 40cm, and the effective volume is 1567ml. When the concentration of nitrate nitrogen in the influent is in the range of 46.50-68mg / L and the hydraulic retention time (HRT) is 2.6h, the bioreactor in the operation stage (3d, 10d, 17d, 23d, 24d) of the biological packed bed reactor Sampling of water outlets S1, S2, S3, S4 of R1 and S4 outlet of bioreactor R2, analysis and determination of nitrate nitrogen concentration and pH value.

[0042] During the operation of the reactor, the hydraulic retention time is only half of that during the start-up p...

Embodiment 3

[0044] On the vertical path of the inflow and outflow of groundwater polluted by nitrates, a 10-40cm thick permeable reaction wall constructed by a homogeneous mixture of polyhydroxyalkanoate and ceramsite is set, and the polyhydroxyalkanoate is mixed with the The particle sizes of the ceramsite mentioned above are 4-6.5mm and 5-8mm respectively, and the mass ratio of the two is 100:2817; after 11-23 days of continuous operation, the concentration of nitrate nitrogen in the effluent is below 3mg / L.

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Abstract

The invention provides a packing medium for a permeable reactive barrier and application of the packing medium to an aspect of in-situ treatment on underground water nitrate pollution, and a method thereof. The packing medium is formed by evenly mixing polyhydroxyalkanoate and ceramsite with the grain sizes of 4-6.5mm and 5-8mm respectively according to a ratio; raw material components of the packing medium are simple, and simple and easy to obtain. The invention also provides the application of the packing medium to an aspect of treatment on underground water nitrate pollution, in particular to the application to an aspect of in-situ treatment on underground water nitrate pollution. In addition, the invention also provides a method for in situ removal of underground water nitrate pollutants; the method takes a mixture of the polyhydroxyalkanoate and the ceramsite as the packing medium for the permeable reactive barrier. The method has the advantages of being simple and practicable, low in cost, long in service life, and small in secondary pollution, not easily causing aquifer blocking, and the like.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a filling medium for a permeable reaction wall and its application and method in in-situ treatment of groundwater nitrate pollution. Background technique [0002] In the past ten years, the nitrate pollution of groundwater in my country has become more and more serious. Drinking nitrate-contaminated groundwater can lead to an increase in the probability of infants suffering from methemoglobinemia and adults suffering from cancer. my country's "Drinking Water Sanitation Standard" (GB5749-2006) stipulates that the upper limit of nitrate nitrogen concentration is 10mg / L, and the World Health Organization also stipulates that the upper limit of nitrate nitrogen concentration is 11.3mg / L. Therefore, how to safely remove nitrate pollution in groundwater has become a hot issue in the field of water pollution control. At present, the methods of removing nitrate in gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C02F103/06C02F101/16
CPCC02F1/58C02F3/305C02F3/341C02F2101/163C02F2103/06C02F2203/004C02F2305/06
Inventor 叶良涛江文韬方彩霞左胜鹏刘荣琼
Owner 四川发展环境科学技术研究院有限公司
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