Method for extracting arsenic and combustible gas from soil polluted by arsenic by using biotechnology

Abstract

The invention relates to a method for extracting arsenic and combustible gas from soil polluted by arsenic by using biotechnology. According to the method, the soil polluted by the arsenic is used as a raw material. The extraction method comprises the following steps: breeding earthworms in the soil polluted by the arsenic and collecting the earthworms rich in arsenic by using a gasification device, a separation device, a gas filtration device and a gas storage tank, namely breeding the earthworms in the soil polluted by the arsenic and collecting the earthworms after four months, intensively airing and gasifying. When the gas flows through the filtration device, an arsenic compound attached to a filtration screen and a combustible gas are obtained; the solid is an arsenic-rich mixture; the earthworms are collected by using a water bath expelling method; the gas filtration device aims at filtering the arsenic to directly obtain an arsenic compound; when the arsenic compound is filtered out of the gas, a combustible gas rich in CO is obtained; and most of the earthworms are pheretima guillemis. The method for extracting arsenic and combustible gas from soil polluted by arsenic by using biotechnology has the beneficial effects that the arsenic in the soil polluted by the arsenic is gathered by the artificially bred earthworms; the secondary pollution to the soil in the overall process is avoided; the investment cost is low; and moreover, the decrease of the soil fertility caused by the damage to the soil structure can be avoided.

Description

technical field [0001] The invention aims at extracting arsenic and combustible gas from arsenic-polluted soil with biotechnology. Background technique [0002] Arsenic is a harmful substance in the environment. For arsenic-contaminated soil, when the arsenic content accumulates in the soil to a certain extent, the most harmful thing is the crop rice, and it may directly endanger human health through the food chain and other ways. [0003] Now commonly used arsenic-contaminated soil remediation techniques include: stable solidification method: first analyze the pollution degree of the treated pollutants, and then match the targeted treatment agents, and mix the arsenic-contaminated soil with 10-30% of the well-proportioned agents Mix, add mixing water and stir in the mixer for 3-5 minutes, discharge and grade for 3-5 days. This can effectively wrap heavy metals in the crystal. So as to achieve the problem of heavy metal pollution control. However, arsenic and heavy metal...

AI Technical Summary

Problems solved by technology

Engineering measures to control heavy metal-contaminated soil have the characteristics of thoroughness and stability, but the large amount of engineering and high investment costs will destroy the soil structure and cause soil fertility to decline