摘要
污泥中含有大量的微生物和易降解有机质,向垃圾填埋场中混入污泥会对生活垃圾的生化降解过程产生一定的影响,从而影响填埋场的稳定化进程。针对这种问题,开展污泥-生活垃圾混合填埋体室内模拟生化降解试验研究,从渗滤液的pH、化学需氧量COD、氨氮浓度以及产气规律等角度研究混合填埋体降解过程变化规律。结果表明:生化降解初期,填埋体渗滤液的COD浓度和氨氮浓度逐渐增大,当生化降解进入稳定阶段后,填埋体渗滤液的COD浓度和氨氮浓度逐渐减小;有机质降解产生的有机酸等小分子有机质在渗滤液中积累导致COD浓度增加;随着污泥掺入量的增加,累计产气量逐渐增大,但是当污泥掺入量超过30%后,累计产气量逐渐减少;垃圾中掺入污泥可以促进垃圾的生化降解过程,但污泥的掺入量并不是越多越好,污泥掺入量超过30%时,反而会抑制生化降解过程。
The sludge contains a large number of microorganisms and easily degradable organic matter.Mixing sludge into waste landfill will have a certain impact on the biochemical degradation process of domestic waste,and affect the stabilization process of landfill.To solve this problem,the study on the biochemical degradation of mixed landfills with sludge and municipal solid waste(MSW)was carried out,and the change law of the degradation process of mixed landfills was studied from the perspectives of pH,COD,and ammonia concentration of leachate and gas production law.The results showed that the concentration of COD and ammonia nitrogen in landfill leachate gradually increased at the initial stage of biodegradation,and when the biochemical degradation entered the stabilization stage,the concentration of COD and ammonia nitrogen gradually decreased.Organic matter degradation produced organic acids and other small molecular organic matter,and accumulated in leachate,increasing COD concentration.With the increase of sludge proportion,the total amount of gas produced gradually increased,but when the sludge amount exceeded 30%,the total amount of gas production gradually decreased.Mixing sludge into MSW can promote the biochemical degradation process of MSW,but the proportion of sludge is not the more the better,when the sludge amount exceeds 30%,it will inhibit the biochemical degradation process.
作者
王佩
李磊
WANG Pei;LI Lei(Anhui&Huaihe River Institute of Hydraulic Research,Hefei 230000,China;Earth Science and Engineering,Hohai University,Nanjing 210098,China)
出处
《人民长江》
北大核心
2024年第4期81-86,共6页
Yangtze River
基金
国家自然科学基金项目(51478167)
安徽省(淮委)水科院青年创新计划项目(KY202206)。
关键词
污泥
生活垃圾
混合填埋体
渗滤液
产气规律
最佳掺入量
生化降解
sludge
domestic waste
mixed landfill
leachate
gas production law
optimal mixing amount
biochemistry degradation
