Sand-attapulgite vertical anti-seepage wall material for landfill and preparation method thereof

Abstract

The invention discloses a sand-attapulgite vertical anti-seepage wall material for a landfill, which belongs to the technical field of garbage landfill vertical anti-seepage. The sand-attapulgite vertical anti-seepage wall material includes standard sands and powdery attapulgite, wherein the weight percentage of standard sands does not exceed 90%, and the balance is powdery attapulgite. The present invention also discloses a method of the material. The sand-attapulgite vertical anti-seepage wall material solves some problems existing in the soil-bentonite anti-seepage wall material. When the content of attapulgite in the backfill is not less than 30%, the permeability coefficient k is lower than 10-9m / s, the compressibility of the backfill is controlled, and the attapulgite content in thebackfill does not exceed 60%. The preparation method of the invention has simple steps, and the attapulgite has large reserve in China and the price is low; the attapulgite is applied to the verticalanti-seepage wall material of landfill, the anti-fouling performance of anti-seepage wall can be increased, construction costs can be saved, and the application of attapulgite in the field of environmental protection can be enlarged.

Description

technical field [0001] The invention belongs to the technical field of vertical anti-seepage of garbage landfills, and in particular relates to a sand-attapulgite vertical anti-seepage wall material used in garbage landfills and a preparation method thereof. Background technique [0002] At present, China's urban waste output is close to 200 million tons per year, growing at a rate of 10%, which seriously threatens the ecological environment and the health of residents. Most of the landfills built in the early stage in my country were relatively simple, and the natural clay layer was mainly used as the anti-seepage liner. The leachate of many simple landfills has caused serious pollution to the surrounding water and soil. Since there is no way to prevent the seepage of the base, vertical seepage prevention is particularly important in order to prevent the impact of the seepage of the simple landfill on the surrounding environment. [0003] The vertical anti-seepage system ...

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Problems solved by technology

[0004] However, studies by scholars have shown that the increase of the concentration of electrolyte and organic solution will significantly increase the permeability of soil-bentonite cutoff wall material and reduce its antifouling performance, while the concentration of pollutants in landfill leachate is generally high; due to long-term As the groundwater level fluctuates, the upper part of the soil-bentonite vertical cut-off wall is constantly subjected to dry-wet cycles, and its permeability coefficient will also increase

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