Petroleum hydrocarbon contaminated soil remedying agent and using method thereof

Abstract

The invention discloses a petroleum hydrocarbon contaminated soil remedying agent and a using method thereof, and belongs to the field of the soil contamination remediation. Aiming at solving the technical problem, the invention provides the petroleum hydrocarbon contaminated soil remedying agent and a remedying method capable of effectively degrading petroleum hydrocarbon in soil, and avoiding soil acidification. The petroleum hydrocarbon contaminated soil remedying agent is prepared from a surfactant, sodium persulfate, citric acid, ferrite and alkaline peroxide. The method is capable of using the surfactant to release the adsorbed-state petroleum hydrocarbon which has a strong binding force with soil colloid, using the citric acid to complex Fe<2+>, continuously activating the sodium persulfate to generate SO4<->.degraded petroleum hydrocarbon, and using the alkaline peroxide to adjust a soil pH, thereby improving the remediation effect of a petroleum hydrocarbon pollutant in the soil, and avoiding a soil acidification problem caused by the sodium persulfate at the same time.

Description

technical field [0001] The invention belongs to the technical field of soil pollution control, and in particular relates to a petroleum hydrocarbon-contaminated soil remediation agent and an application method thereof. Background technique [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, covering an area of ​​3.2×105km 2 , of which about 4.8×106hm 2 According to reports, as of 2018, my country's oil companies have produced about 9 million tons of ground oil due to exploration, exploitation, transportation and storage, and the total petroleum hydrocarbon content in the soil around some oil fields far exceeds the national risk control standards. After petroleum pollutants enter the soil, they are generally concentrated on the surface of the soil, but as time goes by, or due to excessive concentration, abnormal soil geological structure, etc., the pollutants are easy to migrate to the d...

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Problems solved by technology

However, under normal temperature conditions, the reaction between sodium persulfate and petroleum hydrocarbon pollutants is slow, and the degradation effect is weak. Later, some scholars found that under the action of alkali, heat, transition metals, etc., sodium persulfate produced stronger oxidizing properties. SO 4 - , increased the degradation rate and degradation efficiency of petroleum hydrocarbons; the cost of thermal activation is high and the engineering implementation is inconvenient; compared with the activation of transition metals, the degradation efficiency of alkali activation is relatively low; some researchers activated with zero-valent iron and calcium peroxide The method of sodium persulfate to degrade petroleum hydrocarbons is better for the degradation of volatile, free and dissolved states, but the treatment of adsorbed petroleum hydrocarbons with strong binding force with soil colloids needs to be strengthened; some researchers also use transition metals Fe 2+ Catalytic sodium persulfate, but Fe 2+ The metering is difficult to control, the excess Fe 2+ easily quenched SO 4 - , to reduce the effect of reducing petroleum hydrocarbons; in addition, most research focuses only on how sodium persulfate efficiently degrades petroleum hydrocarbons, but does not pay attention to the problem of soil acidification caused at the same time

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