Compound polymer modified bentonite anti-seepage barrier material as well as preparation method and application thereof

Abstract

The invention discloses a compound polymer modified bentonite anti-seepage barrier material as well as a preparation method and application thereof. The compound polymer modified bentonite anti-seepage barrier material is prepared from the following components in percentage by mass: 80 to 95 percent of sodium modified bentonite, 0.5 to 15 percent of polyanionic cellulose and 0.7 to 2.5 percent of hydroxypropyl methyl cellulose, the polyanionic cellulose and the hydroxypropyl methyl cellulose are a compound polymer. For 20-500 mmol / L of heavy metal, organic matter or combined pollution solution, the composite barrier material can still keep an extremely low permeability coefficient, and the permeability coefficient can be reduced by 100 times compared with the permeability coefficient of a traditional barrier material; the composite material can be used for vertical barrier barriers, horizontal barrier systems or geosynthetic clay liners of heavy metal industrial pollution sites, organic matter industrial pollution sites, household garbage landfills and the like, and the anti-seepage and pollution-intercepting performance of the barrier systems or barriers under the action of composite polluted soil and underground water is greatly improved.

Description

technical field [0001] The invention relates to a compound polymer modified bentonite anti-seepage barrier material and a preparation method and application thereof, belonging to the technical field of barrier control of polluted sites or domestic garbage landfills. Background technique [0002] In recent years, with the transformation or relocation of industrial enterprises, a large number of old industrial sites have been left behind, and the pollution problems in the original sites and groundwater in the sites are prominent, affecting human health and urban development. These industrial polluted sites have the characteristics of multiple pollutant types, high pollution concentration, and multiple polluted sites. In addition, there are many types of solid waste in my country and the output is large. In 2018, my country's solid waste stockpile exceeded 60 billion tons, covering an area of ​​over 2 million hectares. Solid waste stockpiling will produce a large amount of le...

AI Technical Summary

Problems solved by technology

Bentonite is one of the main raw materials in geosynthetic clay liners. Under the action of high concentration of heavy metals / organic matter, its permeability coefficient will increase significantly, which will affect its anti-seepage performance; while the raw material of compacted clay liners is only clay, which has a high impact on heavy metals. / The adsorption effect of organic matter is average, and its permeability coefficient is generally only required to be less than 1×10 -7 cm / s, easy to cause pollutants to infiltrate

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