焚烧炉渣填埋对填埋场土工膜结垢的影响  

Effects of incineration bottom ash on geotextile scaling in landfills

作　　者：王前[1] 杨帆[1] 徐期勇[1] 

机构地区：[1]北京大学深圳研究生院环境与能源学院聚硅酸盐复合环保材料工程实验室,深圳518055

出　　处：《环境工程学报》2017年第9期5262-5266,共5页Chinese Journal of Environmental Engineering

基　　金：深圳市科技计划(JCYJ20150616145013931;CXZZ20151117141320317)

摘　　要：我国垃圾焚烧快速发展,其中炉渣作为主要焚烧副产物产量巨大,目前仍以进入生活垃圾填埋场进行填埋处置为主。为探究炉渣加入对填埋场土工膜结垢性质的影响,设置对照组A(新鲜渗滤液)、实验组B(渗滤液通过炉渣)、空白组C(超纯水)3组实验。结果表明,B组结垢现象比A组更明显,C组未出现结垢现象。炉渣的加入导致渗滤液中含钙量由2 407 mg·L^(-1)提升到5 701 mg·L^(-1),第20天时,新鲜渗滤液中土工膜增加质量为0.02 g·cm-2,而炉渣渗滤液中土工膜增加质量达到0.05 g·cm-2。钙离子与填埋气中二氧化碳接触,加速了土工膜结垢现象的产生。同时,二氧化碳消耗量结果表明炉渣与生活垃圾混填导致土工膜结垢反应速率先加快后减慢。结果表明,炉渣进入填埋场加剧了填埋场土工膜堵塞的风险。With the increasing of waste incineration in China,more and more bottom ash has been generated annually. Currently,the most commonly used method for bottom ash is co-disposed with MSW in landfills,which may cause some potential environmental problems. Laboratory studies were conducted to explore the effect of codisposed bottom ash on geotextile scaling in landfills. Different scenarios were simulated,including a fresh leachate（control group A）,a fresh leachate with bottom ash（experimental group B）,and ultra-pure water（blank group C）. The results showed the geotextile in group B with bottom ash had more scale formation than that in group A,while the geotextile in group C didn＇t scaled. The addition of bottom ash increased calcium concentration in leachate from 2 407 mg·L^-1to 5 701 mg·L^-1. The mass of geotextile in fresh leachate increased 0. 02 g·cm^-2in day 20,while it increased 0. 05 g·cm^-2in the group B. The results indicated that carbon dioxide in landfill gas reacted with the calcium ions in leachate,to large extent,resulting in geotextile scaling. In addition,the consumption of carbon dioxide indicated that the scaling rate was decreased over time.Results indicated that bottom ash co-disposed with MSW in landfills,to large extend,improve the risk of geotextile scaling.

关 键 词：炉渣 城市生活垃圾 土工膜 渗滤液 结垢 

分 类 号：X705[环境科学与工程—环境工程]