Sewage purification device used in thermal desorption treatment of soil

Abstract

The invention relates to a sewage purification device used in thermal desorption treatment of soil. The sewage purification device comprises a thermal desorption chamber (1), wherein the thermal desorption chamber (1) is connected with a cooler (2); a lower end outlet of the cooler (2) is arranged opposite to a screening tank (3); the screening tank (3) comprises a vibrating screen plate (31), a metal filter screen (32) and a wastewater pool (33) from top to bottom; the wastewater pool (33) is connected with a purification tower (5) through a water outlet pipe (7); the purification tower (5) is sequentially provided with a sprayer (51), a soot blower (52), a first-layer filter screen (53), a second-layer screen (54) and a third-layer filter membrane (55) from top to bottom; the purification tower (5) is connected with a biological filter (6); and a biological membrane (61) and a rotary spraying device (62) are arranged in the biological filter (6). The sewage purification device has the advantages that pollutants having been subjected to thermal desorption are separated layer by layer, the area and time of contact between active matters and the pollutants are increased, the pollutants are more sufficiently and effectively purified, and purification efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of soil remediation sewage treatment, in particular to a sewage purification device in soil thermal desorption treatment. Background technique [0002] Thermal desorption is to heat the polluted medium and the organic pollutants contained in it to a sufficient temperature through direct or indirect heat exchange, usually heated to 150~540°C, so that the organic pollutants can be volatilized or separated from the polluted medium It is usually divided into two categories: low-temperature thermal desorption technology for soil or sediment heating temperature of 150-315 °C; high-temperature thermal desorption technology for temperature of 315-540 °C. [0003] Thermal desorption is used to vaporize toxic and harmful organic pollutants so that they can be separated from solid matter, and then other systems are used to treat the desorbed organic matter. Thermal desorption separates the pollutants from the soil, th...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of poor and difficult treatment of pollutants after soil thermal desorption, and to provide a sewage purification device in soil thermal desorption treatment, which can separate layers of pollutants after thermal desorption treatment, and can increase the contact area and time between active substances and pollutants, so that they can more fully and effectively purify pollutants and improve purification efficiency

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