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污泥与生活垃圾混合填埋对渗滤液导排系统堵塞的影响
Effect of mixed landfill of sludge and MSW on clogging of leachate collect system
投稿时间:2018-07-31  修订日期:2018-11-16
DOI:
中文关键词:  污泥  生石灰  填埋  渗滤液  导排系统  堵塞  
英文关键词:Sludge  quicklime  landfill  leachate  LCS  clogging
基金项目:生活垃圾填埋场污染控制措施适用性评估与全过程监管方法研究(201509055)
作者单位E-mail
孙伟新 固体废物处理与环境安全教育部重点实验室 13240434867@163.com 
刘意立 固体废物处理与环境安全教育部重点实验室  
刘建国 固体废物处理与环境安全教育部重点实验室 jgliu@tsinghua.edu.cn 
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中文摘要:
      污泥经预处理达到入场标准后与生活垃圾混合填埋是我国现阶段污泥处理的主要方式。由于污泥与生活垃圾特性差异较大,会影响渗滤液物理、化学、生物特性,进而对填埋场渗滤液导排系统产生不利影响。本研究通过柱实验对比了污泥与生活垃圾混填前后产生的渗滤液水质变化,得到如下结论:(1)污泥与生活垃圾混填后渗滤液中颗粒物浓度及大颗粒物占比均有显著提升;(2)采用生石灰对污泥预处理提高了污泥自身有机质(VFAs等)的释放速率;(3)8%的生石灰预处理污泥(10%混合比例)掺加量会提高生活垃圾产生的渗滤液中Ca2+浓度31.6%。结合填埋场导排系统堵塞的影响因素:微细颗粒物沉淀、微生物膜生长及钙基化合物沉积,从减缓填埋场导排系统堵塞、延长填埋场使用年限的角度来看,污泥宜单独分区填埋,生石灰预处理污泥不宜与生活垃圾混填。
英文摘要:
      Sludge is pretreated to meet the landfill admission standard and then mixed with MSW to landfill, it’s the main disposal method nowadays in China. Because of the conspicuous difference between the sludge and MSW, mixing process will influence the physical、chemical and biological characters of leachate and then have a bad influence on the landfill leachate collection system. The leachate properties of sludge and municipal solid waste (MSW) are compared by the column experiments and the conclusions are as followings: (1) Mixing sludge with MSW to landfill will increase the concentration of Total Suspended Solid (TSS) and improve the proportion of large particles significantly; (2) Sludge pretreated by the quick lime improves the releasing rate of the organic materials in sludge; (3) Adding 8% of quick lime pretreated sludge (Mixing ratio:10%) can improve calcium ion concentration in leachate by 31.6%. Considering the influence factors causing clogging of leachate collection system (LCS ):the sediment of particles、the growth of biofilm and the precipitation of calcium carbonate. From the perspective of slowing down the clogging the LCS and prolonging running time of landfill, sludge should be zoning landfill the quick lime pretreated sludge should not be mixed with MSW to landfill.
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