Landfill seepage-proof system for prolonging breakdown time of heavy metal irons and breakdown monitoring method

Abstract

The invention discloses a landfill seepage-proof system for prolonging breakdown time of heavy metal irons and a breakdown method. The system comprises a seepage-proof cushion layer, a number direct current power supply, an electric current sensor, a computer and an alarming device. The seepage-proof cushion layer comprises a lower outer layer high-density polyethylene geomembrane, a lower conductive geotextile, a middle swelling clay layer, an upper conductive geotextile and an upper outer layer high-density polyethylene geomembrane. The upper conductive geotextile is connected with a negative pole of the number direct current power supply to serve as a cathode. The lower conductive geotextile is connected with a positive pole of the number direct current power supply to serve as an anode. Electric field force is applied to the middle seepage-proof cushion layer through the upper conductive geotextile and the lower conductive geotextile, so that the pollution irons of heavy metal and the like move reversely, and accordingly, the service life of the seepage-proof cushion layer is greatly prolonged. A microstructure of the middle swelling clay layer changes into a particle packing structure from an original flocculent structure under the effect of the electric field force, so that the transportation and diffusion of pollutants are better prevented.

Description

technical field [0001] The invention belongs to the field of anti-seepage of landfills, and in particular relates to a method for realizing delayed breakdown of heavy metal ions through landfill anti-seepage cushions and monitoring damages such as breakdown of anti-seepage cushions by controlling ion migration. Background technique [0002] With the rapid development of my country's economy and the acceleration of urbanization, urban domestic waste has increased dramatically, and the number of landfills has also continued to increase. Most of the urban waste in my country is kitchen waste, and the development of treatment technology is relatively late, and there is no early classification treatment before landfill, which leads to high water content in landfill waste. The relatively high water content leads to a relatively high water level of the landfill leachate. Under the action of the high water level leachate, the landfill is prone to leakage problems, causing the surrou...

AI Technical Summary

Problems solved by technology

According to the domestic test data, the service life of the anti-seepage cushion is within 20 years, while the design service life of the landfill is generally about 40 years. Under the long-term action of the leachate, the pollutants will gradually pass through the high-density polyethylene geomembrane (HDPE) The bentonite clay layer entering the middle layer, if certain measures are not taken, the heavy metal ions in the leachate will break through the anti-seepage cushion layer in the later stage of landfill use, causing irreparable pollution to the surrounding soil and groundwater

The existing technology improves the anti-seepage layer of bentonite by adding additives to improve the anti-seepage performance of clay. This method is time-consuming and labor-intensive and difficult to achieve industrialization.

In addition, there is currently no suitable and economical method for monitoring the breakdown or damage of the anti-seepage cushion in the landfill, resulting in the failure of the anti-seepage cushion to be discovered in time, and the delay in taking measures often leads to a wider range of disasters. Pollution

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