In-situ remediation method using peat in underground water polluted by petroleum hydrocarbon as an additive medium

Abstract

The invention relates to an in-situ remediation method using peat in underground water polluted by petroleum hydrocarbon as an additive medium, which comprises: domesticating a strain; separating the strain; preprocessing peat; performing amplification culture of functional bacteria; immobilizing the functional bacteria receiving the amplification culture in the wet peat which is heated; uniformly mixing the peat carrying the functional bacteria and coarse sand in a certain volume ratio to prepare a reaction wall supporting medium; and filling the reaction wall supporting medium into a permeable reaction wall. The method has the advantages that: the peat used as a biological reaction wall additive medium can effectively immobilize functional bacteria, are insusceptible to flow away with underground water so as to be lost and can effectively absorb petroleum hydrocarbons, benzenes, toluenes, ethylbenzenes, dimethylbenzenes and naphthalines in the underground water, wherein the immobilization rate of the peat is 87 percent according to measurement in experiment and the absorption effect of the peat on polycyclic aromatic hydrocarbons is particularly obvious; nutrients are effectively fed to the functional bacteria in the reaction wall so as to ensure points in the reaction wall can keep high biomass in an operation period; and the peat used is cheap, widely and readily available and ecologically safe.

Description

Technical field: [0001] The invention relates to a groundwater-contaminated site restoration technology, in particular to a support medium and a permeable reaction wall for in-situ restoration of petroleum hydrocarbon-contaminated groundwater. Background technique: [0002] In view of the seriousness of petroleum hydrocarbons polluting groundwater, scholars from various countries have carried out extensive research on the control and restoration of petroleum hydrocarbons polluted groundwater. Among them, the permeable reactive barrier technology (Permeable Reactive Barrier, PRB) is a method emerging in many developed countries such as Europe and the United States for in-situ removal of polluted components in groundwater. [0003] The U.S. Environmental Protection Agency (USEPA) defines PRB as: placing active material walls underground to intercept pollution plumes, so that after the pollution plumes pass through the reaction medium, their pollutants can be converted into ano...

AI Technical Summary

Problems solved by technology

However, in the actual restoration process, the PRB bioremediation efficiency may be low due to the low temperature in the groundwater environment, oligonutrients, and the possible competition among strains. At the same time, the affinity between the indigenous petroleum hydrocarbon-degrading bacteria and the support medium is weak, making it easy to follow the groundwater. In addition, the bioremediation efficiency is easily affected by the external environment