Electric-microbial combined in-situ remediation method for contaminated soil

Abstract

The invention belongs to the technical field of electric-microbial in-situ remediation of petroleum hydrocarbon contaminated soil, and particularly relates to an in-situ electric-microbial combined remediation technology based on petroleum hydrocarbon concentration difference in a contaminated area and application of the in-situ electric-microbial combined remediation technology. Investigation andpollution range analysis are conducted on a polluted site, high-concentration petroleum hydrocarbon polluted soil, medium-concentration petroleum hydrocarbon polluted soil and low-concentration petroleum hydrocarbon polluted soil are divided, and then an electric-microbial combined remediation material composed of an anode densification electrode set, an electric-microbial synergistic electrode set and a biological enhancement electrode set and an application mode are designed for soil of different pollution degrees. Technical parameters including the voltage intensity, a pole inversion period, an electrode spacing, an acid liquid supply amount and the like are designed in a matched manner, and power output of a variable frequency pump, an acid liquid storage tank and a bacterial liquid storage tank is utilized, so that high-concentration petroleum hydrocarbon contaminated soil is removed through a chemical oxidation effect, the medium-concentration petroleum hydrocarbon contaminatedsoil is degraded through a synergistic effect of chemical oxidation and microbial metabolism, and the low-concentration petroleum hydrocarbon contaminated soil is removed through enhanced microbial metabolism. The invention constructs a set of complete electric-microbial combined remediation technical system for in-situ soil with different pollution degrees.

Description

technical field [0001] The invention belongs to the technical field of electrokinetic-microbial remediation of soil environment, and furthermore, develops a combined in-situ remediation method of electrokinetic-microbial remediation of contaminated soil based on the distribution of petroleum hydrocarbon concentration based on the difference in the degree of petroleum hydrocarbon pollution in in-situ polluted soil, so as to realize Targeted in-situ remediation of petroleum hydrocarbon-contaminated soil with differentiated pollution degree characteristics. Background technique [0002] With the vigorous development of the petrochemical industry and the continuous improvement of economic benefits, the development and output of petrochemical products are booming. However, the production process of petroleum and its products has brought about the problem of soil environmental pollution. For example, the oil spilled on the ground during crude oil extraction, leakages and accident...

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Problems solved by technology

Among them, the ectopic repair technology has higher repair strength, stronger controllability, and generally higher repair efficiency in the process of treatment, but the economic cost caused by the process of ectopic transfer and repair is also higher, involving loading, transportation, unloading, etc. A series of processes such as material, skid-mounted equipment assembly, disposal and return increase the repair cost

In-situ remediation has the advantages of convenience and economy, but it has defects such as low efficiency and poor repair uniformity in disposal, especially for polluted plots with significant regional differences in pollution levels, and unified technical disposal is difficult to meet the requirements for high-concentration The need for joint treatment with low-concentration oil-contaminated soil has caused problems such as uneven restoration and substandard land as a whole

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