Petroleum-hydrocarbon-contaminated soil repairing medicament and use method

Abstract

The invention relates to a petroleum-hydrocarbon-contaminated soil repairing medicament and a use method and belongs to the technical field of soil environment repairing. The medicament is composed of sodium persulfate (Na2S2O8), zero-valent iron (Fe <0>) and calcium peroxide (CaO2), and the molar ratio of the Na2S2O8 to Fe <0> to CaO2 is 5: 2: 2. The Na2S2O8 is fed into a slurry system, the Fe <0> and the CaO2 are added for interphase activation, two types of free radicals with extremely high oxidability including a sulfate radical anion and a hydroxyl radical (.OH) can be obtained simultaneously for decomposing petroleum hydrocarbon in soil, wherein the formula of the sulfate radical anion can be found in the specification. According to use parameters of the repairing medicament, the feeding amounts of the sodium persulfate, the zero-valent iron and the calcium peroxide are 2 mmol / g, 0.8 mmol / g and 0.8mmol / g of soil correspondingly; the water soil ratio (milliliter: g) is 2.5: 1; a reaction is performed for 4-8 hours after the water and soil are uniformly mixed; and the water can be used repeatedly. Compared with a traditional chemical method, the range of acted organic pollutants is wider; the Fe <0> and the CaO2 are wide in resource, easy to obtain and low in cost; the two types of activating agents including the CaO2 and the Fe <0> are fed, the activating effect is better, and secondary pollution is avoided; and the reaction is mild, and safety is high.

Description

technical field

[0001] The invention relates to a repairing agent for petroleum hydrocarbon contaminated soil and a method for using the same, mainly through the activation of sodium persulfate by an activator to generate sulfate radicals and hydroxyl radicals (·OH), two highly oxidizing free radicals, remove petroleum pollutants in soil, and belong to the technical field of organic polluted soil remediation. Background technique

[0002] Petroleum is the most important energy source in today's society. With the rapid development of our country's society and economy, the demand for oil has also increased dramatically. Soil oil pollution caused by oil extraction, transportation, processing and use is also becoming more and more serious. According to the 2015 soil pollution survey report, at least 5 million hectares of soil in my country have been polluted by oil, accounting for about 20% to 30% of the total area of ​​oilfield mining areas. Due to my country's backward oil...