Biological permeable reactive barrier for combined pollution site and preparation method thereof

Abstract

The invention discloses a combined pollution site biological permeable reactive barrier which comprises a concrete base, a concrete top cover, a reactive barrier cavity and a reaction area filler, andthe reaction area filler comprises a phosphate-solubilizing bacillus mineralization layer, an anaerobic bacillus degradation layer and an aerobic bacillus degradation and oxygen release layer which are sequentially arranged in the seepage direction of underground water; the phosphate-solubilizing bacillus mineralization layer comprises phosphate-solubilizing bacillus, first quartz sand and phosphate ore powder; the anaerobic bacillus degradation layer comprises anaerobic bacillus, second quartz sand and first activated carbon; the aerobic bacillus degradation and oxygen release layer comprises aerobic bacillus, peroxide, third quartz sand and second activated carbon; heavy metal-organic matter combined pollution remediation can be achieved, and the purification capacity is high; the service strength can be elastically adjusted according to pollution degree changes, and the reactive barrier service life is prolonged; the combined pollution site biological permeable reactive barrier canbe used for preventing and treating high-risk sudden pollution sites.

Description

technical field [0001] The invention relates to the technical field of groundwater pollution remediation, in particular to a biologically permeable reaction wall for complex polluted sites and a preparation method thereof. Background technique [0002] In developing countries driven by industry, complex situations such as various types of heavy metals, organic and compound pollution, and combined soil and water pollution are common. Existing methods for treating polluted groundwater include in-situ remediation and ex-situ remediation. Permeable reaction wall technology is a commonly used in-situ treatment technology in groundwater remediation. It is constructed perpendicular to the direction of contaminated groundwater flow. The permeable reaction wall The internal reactive material removes pollutants that flow through the groundwater. Permeable reactive walls have the advantages of continuous in-situ treatment of pollutants, treatment of various pollutants, small disturban...

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Problems solved by technology

[0004] However, the existing microbial permeable reaction walls have the following defects: poor remediation effect and weak purification ability for heavy metals and heavy metal-organic compound pollution; microbial nutrients in the permeable reaction walls are continuously consumed, making the life of the reaction walls short; microbial activity Determined by the existing nutrient content in the reaction wall, it is impossible to adopt appropriate metabolic activity according to the degree of pollution. Therefore, for polluted sites with variable pollution degrees, the restoration intensity cannot be adjusted flexibly according to the degree of pollution; once the microbial reaction wall is put in, the survival and metabolism of microorganisms will start. , which cannot meet the requirements of the permeable reaction wall for standby service in the prevention and control of high-risk sudden pollution sites

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