Preparation method of biochar-immobilized and microorganism-filled permeable reaction wall

Abstract

The invention discloses a preparation method of a biochar-immobilized and microorganism-filled permeable reaction wall, belonging to the field of groundwater pollution remediation. The permeable reaction wall provided by the invention comprises four layers of structures, i.e., a coal slag inflow layer, an iron powder mixed packing layer, an immobilized microbial layer and a coal slag effluent layer, wherein the coal slag inflow layer, the coal slag effluent layer and the iron powder mixed packing layer can achieve the purpose of reducing dissolved oxygen in water; biochar is used for producingimmobilized granules of degrading bacteria in an immobilized microbial layer, and is filled into a permeable reaction wall body after being mixed with quartz sand; the coal slag effluent layer is added at the downstream; immobilized anaerobic microorganisms are applied to degradation of the pollutants in groundwater, so that the loss of bacterial species is reduced, and the sewage treatment efficiency can be improved; the permeable reaction wall provided by the invention is low in cost, less in microbial loss, high in activity and strong in impact resistance, and can be applied to the 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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