管式膜MBR技术在垃圾渗滤液处理中的应用-环境与化学工程专业论文.docxVIP

摘 摘 要 本文采用管式膜生物反应器(TMBR)工艺对垃圾焚烧场渗滤液进行处理。 考察了TMBR工艺对垃圾渗滤液的处理效果及管式膜性能的变化，为其在高浓 度有机废水的处理应用提供有价值的理论依据和经验。针对TMBR工艺处理垃 圾渗滤液出水COD仍较高的问题，采用纳滤、石灰法深度处理MBR出水，以 提高出水水质。具体的研究结果归纳如下： l、采用“兼氧+一级好氧+二级好氧TMBR”工艺处理垃圾焚烧场渗滤液。 在迸水COD为42071--68583mg／L，氨氮1156～2342mg／L，pH5．3～7．4，电导 11．02～14．32mS／cm，水力停留时间为分别为8d、6d、6d的情况下，COD的总去 除率在96．3—99．1％之间，氨氮的总去除率大于99％。增加MBR向兼氧反应器的 混合液回流(回流比3：1)，对MBR出水水质影响不大。当一级好氧反应器COD 较低时，渗滤液中可生化部分有机物已被大量去除，二级好氧反应器的COD去 除率也较低。MBR出水中硝氮含量为100～233mg／L，亚硝氮含量基本上小于 0．2mg／L。 2、采用“兼氧+好氧TMBR”工艺处理垃圾焚烧场渗滤液，考察了操作压力、 循环流量、温度、污泥浓度等对膜性能的影响及长时间运行下的膜通量的变化、 膜衰减情况及膜清洗恢复情况。结果表明，随着压力和温度的升高，膜通量也随 之升高，污泥浓度对膜通量影响不大，污泥浓度在30--459／L时，膜通量仍能维 持在70～100L／m2．h之问，11．25h内膜通量平均衰减了约15％。通过适当的清洗 (NaCl0清洗)，管式膜能保持在较高的通量(70,～100L／m2h以上，温度在 27．4~32．1。C)下长时间稳定运行。 3、采用纳滤技术对垃圾焚烧场渗滤液TMBR出水进行深度处理，探讨了该 方法应用于垃圾渗滤液深度处理的可行性。结果表明，COD去除率维持在90％ 左右，氨氮去除率在50～70％之间。实验过程中膜通量和脱盐率的变化不大，膜 性能稳定。本课题丰要探索垃圾渗滤液深度处理的实验效果，为垃圾渗滤液处理 提供参考。 4、采用石灰法对垃圾焚烧场渗滤液TMBR出水进行深度处理，探讨了该方 法应用于垃圾渗滤液深度处理的可行性。结果表明，Ca(OH)2投加质量浓度为 89／L时，pH达到12．57，COD和色度的去除率分别为40．6％，82．8％。 关键词：管式膜；MBR：垃圾渗滤液；纳滤：深度处理；膜通量；石灰 AbstractThe Abstract The treatment of the incineration plant leachate were investigated by tubular membrane MBR(TMBR)this thesis．The treating effect of TMBR to landfill leachate and the changes of membrane performance were studied with the aim of supplying valuable theory and experience to the field of high concentration organic wastewater winl耶MBR．The results are as follows： l、The‘hypoxia+aerobic 1+aerobic2 TMBR’process Was selected to treat the incineration plant leachate．The water quality of this leachate Was as follows：COD、 NH4+、pH and conductivity was 42071-68583mg／L、1 156-2342mg／L、5．3-7．4、 “．02-14．32mS／cm respectively，HRT were 8d,6d．6d．COD total removal rate Was 96．3—99．1％．and NI-14+total removal rate Was greater than 99％．there was little effect on the MBR effluent when increased the MBR backnOW to reactor(reflux ratio Was 3：l 1．The second aerobic reactor COD removal rate was low when the aerobicl reactor COD Was low，because it had been removal ofa