| 简介 |
PURPOSE : To provide a treatment method of arsenic-contaminated soil by soil washing, wherein the method is capable of reducing treatment cost and increasing process efficiency by stably removing arsenic from an arsenic-contaminated soil through a continuous process.
CONSTITUTION : A treatment method of arsenic-contaminated soil by soil washing comprises : a step(S10, S20) of determining a grain size range of earth and sand an arsenic adsorption amount of which is a standard value or more by drilling a sample of arsenic-contaminated earth and sand; a step(S30) of adjusting pH of a washing separation liquid such that elution of arsenic adsorbed onto the earth and sand is minimized; a step(S40) of separating grains by a wet process using at least one hydrocyclone; a step(S50) of solidifying the dewatered earth and sand after dewatering earth and sand having a grain size smaller than a standard grain size; and a step(S55) of filling in again earth and sand having a grain size larger than the standard grain size or recycling the earth and sand according to an arsenic content of the earth and sand.
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