Preparation method of permeable reaction wall filled with microorganisms fixed by biological carbon

Abstract

The invention discloses a preparation method of a permeable reaction wall filled with microorganisms fixed by biological carbon, and belongs to the field of groundwater pollution remediation. The permeable reaction wall provided by the invention comprises a four-layer structure comprising a coal cinder water inlet layer, an iron powder mixed filler layer, a fixed microorganism layer and a coal cinder water outlet layer, wherein the coal cinder water inlet layer, the coal cinder water outlet layer and the iron powder mixed filler layer can be used to achieve a purpose of reducing dissolved oxygen in water; biological carbon is used for preparing fixing particles of degrading bacteria in the fixed microorganism layer; the biological carbon is mixed with quartz sand, and then the obtained mixture fills the permeable reaction wall; and the coal cinder water outlet layer is added downstream. Pollutants in underground water can be degraded by applying fixed anaerobic microorganisms, so thatstrain loss is reduced, and sewage treatment efficiency can be improved. In addition, the permeable reaction wall is low in cost, low in microorganism loss, high in activity and high in impact resistance, and can be applied to anaerobic microorganisms.

Description

technical field [0001] The invention belongs to the field of groundwater pollution restoration, and more specifically relates to a preparation method of a permeable reaction wall filled with biochar immobilized microorganisms. Background technique [0002] Soil and groundwater pollution is a serious environmental pollution problem facing society at present. The remediation methods for dealing with contaminated groundwater include in-situ remediation and ex-situ remediation. Although ex-situ remediation has a significant effect in the initial stage of treatment, it has little effect on post-treatment , can only be used as a temporary control method, so ectopic repair technology is gradually replaced by in situ repair technology. [0003] The in-situ remediation technology of groundwater pollution can be divided into physical remediation, chemical remediation, and biological remediation according to the remediation mechanism. Physical remediation such as gas extraction techno...

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Problems solved by technology

[0004] Although bioremediation technology has the above-mentioned advantages, it also has limitations: the effect of microbial remediation is greatly affected by environmental factors, the loss of efficient strains leads to a decrease in bacterial density, and poor competitiveness with indigenous microorganisms, etc.

The adsorption method is easy to operate and does not affect the activity of microorganisms, but it is greatly affected by the type of carrier and the specific surface area, and the bacteria are easily separated from the carrier; the cross-linking method is firmly combined and the cells are highly dense, but chemical cross-linking will affect cell activity and the operation is expensive; The embedding method has strong physical and chemical stability and high particle strength, but the operation process is complicated and has a great impact on mass transfer performance; the interception method can target the reaction substrate, but the membrane is easily fouled and blocked, and the cost is high

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