A kind of landfill anti-seepage slurry material based on sodium carboxymethyl cellulose modification and preparation method

A technology for landfills and pulp materials, applied in the field of environmental engineering, can solve the problems of high retardation rate, high cost, complex composition of landfill leachate, etc., and achieve the effects of good durability, stability, plasticity and toughness

Active Publication Date: 2021-03-12
JIANGSU JIANYUAN CONSTR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of organically treating bentonite with polyvinyl alcohol is relatively high
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

Method used

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  • A kind of landfill anti-seepage slurry material based on sodium carboxymethyl cellulose modification and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The anti-seepage slurry material of the garbage dump of the present embodiment uses each agent component and content as (unit kg / m 3 ): cement 245, bentonite 255, fly ash 200, sodium carboxymethyl cellulose 1.6, aluminum chloride 1.5, polycarboxylate superplasticizer 0.4, soda ash 1.5, pure water 730.

[0026] ①Take 1.5kg of soda ash, dissolve it in 25kg of water at room temperature, and let it stand for more than 1 hour for use;

[0027] ②Take 1.6kg of sodium carboxymethyl cellulose, dissolve it in 50kg of water at room temperature, and let it stand for more than 2 hours for use;

[0028] ③Take 1.5kg of aluminum chloride, put it into 25kg of water to dissolve at room temperature, and let it stand for more than 2 hours for use;

[0029] 4. get bentonite (montmorillonite mineral content is 60% clay) 255kg, put into above-mentioned sodium carboxymethyl cellulose solution, add soda ash solution and aluminum chloride solution to it then, carry out common modification treat...

Embodiment 2

[0033] The anti-seepage slurry material of the garbage dump of the present embodiment uses each agent component and content as (unit kg / m 3 ): cement 220, bentonite 220, fly ash 180, sodium carboxymethyl cellulose 0.6, aluminum sulfate 0.6, polycarboxylate superplasticizer 0.3, soda ash 0.6, pure water 760.

[0034] ① Take 0.6kg of soda ash, dissolve it in 25kg of water at room temperature, and let it stand for more than 1 hour for use;

[0035] ②Take 0.6kg of sodium carboxymethyl cellulose, dissolve it in 50kg of water at room temperature, and let it stand for more than 2 hours for use;

[0036] ③Take 0.6kg of aluminum sulfate, dissolve it in 25kg of water at room temperature, and let it stand for more than 2 hours for use;

[0037] 4. get bentonite 220kg (montmorillonite mineral content is the clay of 40%), put into above-mentioned sodium carboxymethyl cellulose solution, add soda ash solution and aluminum sulfate solution to it then, carry out common modification treatment...

Embodiment 3

[0041] The anti-seepage slurry material of the garbage dump of the present embodiment uses each agent component and content as (unit kg / m 3 ): cement 280, bentonite 280, fly ash 220, sodium carboxymethyl cellulose 3.2, aluminum chloride 2.5, polycarboxylate superplasticizer 0.5, soda ash 3.2, pure water 700.

[0042] ①Take 3.2kg of soda ash, dissolve it in 25kg of water at room temperature, and let it stand for more than 1 hour for use;

[0043] ②Take 3.2kg of sodium carboxymethyl cellulose, dissolve it in 50kg of water at room temperature, and let it stand for more than 2 hours for use;

[0044] ③Take 2.5kg of aluminum chloride, dissolve it in 25kg of water at room temperature, and let it stand for more than 2 hours for use;

[0045] 4. get bentonite 280kg (montmorillonite mineral content is the clay of 80%), put into above-mentioned sodium carboxymethyl cellulose solution, add soda ash solution and aluminum chloride solution to it then, carry out common modification treatme...

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Abstract

The invention discloses a garbage dump anti-seepage slurry material modified based on sodium carboxymethyl cellulose and a preparation method thereof. The anti-seepage slurry material formula is composed of cement, bentonite, fly ash, sodium carboxymethyl cellulose, aluminum salt polycarboxylate high-performance water reducer, soda ash, etc., sodium carboxymethyl cellulose, soda ash and aluminum salt are combined As a modifier for bentonite. The stone rate of the anti-seepage slurry material is greater than 99.9%, and the 28d permeability coefficient of the consolidated body is 0.55×10 ‑8 ~6.7×10 ‑10 cm / s, the unconfined compressive strength is 0.40~1.95MPa; Cr 、BOD 5 , NH 4 ‑N, TP, SS, etc. have a blocking rate of over 96.5%, and the blocking rate of Hg, Pb and other heavy metal ions is over 99.95%. The slurry stone body has good durability and stability, suitable compressive strength and elastic modulus, good plasticity and toughness, and coordinates with the foundation deformation of the landfill to ensure that the anti-seepage separation wall does not crack within the design service life with failure. The anti-seepage slurry material of the invention is low in cost, non-toxic and environment-friendly, has strong controllability of setting time, and is convenient for preparation and use on the construction site.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering for domestic garbage disposal and pollution prevention, and in particular relates to a garbage dump anti-seepage slurry material and a preparation method. Background technique [0002] Household garbage refers to all kinds of solid waste generated in urban daily life or activities that provide services for urban daily life. Our country produces about 200 million tons of various household garbage every year, and it increases at a rate of 8% to 10% per year. According to the survey on the domestic garbage situation 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 the complex composition of the leachate (COD Cr 、BOD 5...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04
Inventor 代国忠章泽南李书进施维成史贵才李雄威李鹏波许家境
Owner JIANGSU JIANYUAN CONSTR CO LTD
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