Biological-humic-acid green in-situ restoration process for polluted soil containing medium-low-concentration oil hydrocarbon

Abstract

The invention discloses a biological-humic-acid green in-situ restoration process for polluted soil containing medium-low-concentration oil hydrocarbon. The biological-humic-acid green in-situ restoration process is characterized in that dominant strains for removing aromatic hydrocarbons are screened in the soil containing oily sludge, are inoculated, supported and cultured in nutrient solution,and then are loaded on biomass pyrolysis semicoke to prepare a semicoke restoration agent; then the semicoke restoration agent and humic acid are uniformly mixed with polluted soil containing low-concentration oil, aging is carried out for 5 days, and fast-growing grass for absorbing polycyclic aromatic hydrocarbons can be planted as a biomass gasifying material; the effects of removing the polycyclic aromatic hydrocarbons and immobilizing heavy metals reach national standard requirements and the self-restoration and planting functions of the soil are recovered.

Description

1. Technical field [0001] The green in-situ remediation process of biological humic acid in soil polluted by medium and low concentration oily hydrocarbons provided by the invention relates to the purification and treatment of polluted soil, in particular to the remediation of crude oil polluted soil. 2. Background technology [0002] As one of the top ten oil-producing countries in the world, my country has explored and developed more than 400 oil and gas fields and reservoirs, which are distributed in 25 provinces, municipalities, and autonomous regions across the country, and the working area of ​​oil fields is nearly 200,000 km2. According to estimates, as of 2011, my country's oil companies produced about 7 million tons of ground oil every year. Oil pollution to soil is mainly caused in the process of oil exploration, exploitation, transportation and storage, and the large area of ​​soil around oil fields is generally susceptible to serious pollution. Liu Wuxing from t...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the shortcomings of the existing low-concentration petroleum hydrocarbon-contaminated soil remediation technology and to invent a green in-situ remediation process for biological humic acid in medium-low concentration oily hydrocarbon-contaminated soil. The native dominant flora under local soil and climate conditions efficiently eliminate PAHs, plant fast-growing grasses that are easy to absorb PAHs as raw materials for biomass gasification, and humic acid promotes the metabolic activities of native dominant flora and the growth of fast-growing grasses to strengthen PAHs The three methods of removing and solidifying heavy metals are combined to ensure that the treated soil meets the standards, shorten the detoxification time, restore soil self-repair and planting and greening functions, and realize safe, low-cost, permanent and sustainable green in-situ restoration