Wasteyard impermeable material based on polyvinyl alcohol- aluminum chloride combined modification and preparation method thereof

Abstract

The invention discloses a wasteyard impermeable material based on polyvinyl alcohol-aluminum chloride combined modification and a preparation method thereof and belongs to the field of underground construction for domestic refuse disposal and pollution prevention and control. The impermeable material provided by the invention is prepared from ordinary Portland cement, bentonite, coal ash, polyvinyl alcohol, aluminum chloride, polycarboxylic acid high-performance water reducer and sodium carbonate, wherein polyvinyl alcohol and aluminum chloride are used for jointly modifying bentonite. The prepared impermeable material is characterized by stone rate above 99.9%, induration 28d permeability coefficient of 0.86*10<-8>-7.7*10<-10>cm / s and unconfined compressive strength of 0.43-1.65MPa; the retardant rate of the solid pulp to CODCr, BOD5, NH4-N, TP and SS is 96% or above and the retardant rate to heavy metal ions, such as, Hg and Pb, is 99.95% or above; the pulp stone has ultrahigh enduring stability and is capable of guaranteeing the impermeable separating wall without crack or invalidation within designed working life; the impermeable pulp provided by the invention is low in cost, is nontoxic and environment-friendly, is high in controllability for setting time and is convenient for construction site preparation and use.

Description

technical field [0001] The invention relates to the underground engineering field of domestic garbage disposal and pollution prevention and control, more specifically, relates to a garbage dump anti-seepage slurry based on polyvinyl alcohol and aluminum chloride co-modified and a preparation method thereof. Background technique [0002] Municipal solid waste refers to all kinds of solid waste and landfill leachate produced in urban daily life or activities that provide services for urban daily life. Our country produces about 200 million tons of domestic waste every year, and it increases at a rate of 8% to 10% per year. According to the survey of domestic waste in nearly 700 cities in China, more than 230 cities are surrounded by garbage. [0003] During the landfill process of municipal solid waste, leachate (or leachate) is formed due to the anaerobic decomposition of garbage microorganisms, leaching of precipitation, surface runoff and groundwater infiltration. Due to t...

AI Technical Summary

Problems solved by technology

However, the anti-seepage slurry material needs to use a large amount of high-cost soda ash, resulting in high cost of the anti-seepage slurry material; moreover, the anti-seepage slurry material has problems such as poor fluidity and short pumping period, which lead to its on-site construction. It is inconvenient; moreover, the anti-seepage performance of the anti-seepage slurry and the blocking and adsorption rate of pollutants need to be further improved

At the same time, due to the complex composition of landfill leachate, there is no slurry material in the prior art that can achieve high retardation rate and low permeability coefficient at the same time.

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