摘要
多介质土壤层系统（MSL）是一种适合于农村地区处理生活污水的新型分散式污水处理系统。试验设计了4个长、宽、高分别为50、10、60 cm的MSL系统,该系统由土壤混合层和通水层交叠成层组成。土壤混合层选用普通砂土,添加木屑混合木炭/秸秆、铁粒/膨润土按照7∶2∶1的干质量比例均匀混合,通水层选用沸石或者普通砾石。MSL系统在水力负荷500 L.m-2.d-1下连续运行2个月。结果表明,4个MSL系统对CODCr的平均去除率差别不大,为79.58%~80.22%;对TP去除率为47.83%~82.60%,添加沸石和膨润土可以较大程度地增加TP去除率;对TN的去除率为29.74%~57.89%,通水层为沸石的MSL系统去除率明显优于砾石;木炭混合木屑较秸秆更适合作为MSL系统的有机碳源。
Multi-media-soil-layering（MSL） is a new type of decentralized domestic wastewater treatment system,especially fit for rural areas.In the experiment four MSL systems were constructed in box（50 cm×10 cm×60 cm） comprising typically soil mixture layers alternated with permeable layers.The soil mixture layer contained sandy soil,sawdust and charcoal/straw,iron scraps/bentonite mixed at a ratio of 7∶2∶1 by dry weight,and the permeable layer was composed of zeolite and gravel.The MSL systems ran continuously for two months at a hydraulic loading rate（HLR） of 500 L·m-2·d-1.Results show that the four MSL systems did not differ much in average CODCr removal rate,varying in the range of 79.58%-80.22%;and their TP removal rate was in the range of 47.83%-82.60%,and addition of zeolite and bentonite in the permeable layers increased TP removal rate by a large margin;their TN removal rate varied in the range of 29.74%-57.89%.Permeable layers of zeolite were better than those of gravel.The mixture of charcoal and sawdust was more suitable as organic carbon source than straw in the MSL systems.
出处
《生态与农村环境学报》
CAS
CSSCI
CSCD
北大核心
2010年第A01期14-18,共5页
Journal of Ecology and Rural Environment
基金
公益性科研院所基本科研业务费项目
关键词
MSL系统
材料选配
生活污水
去除率
MSL system
material matching
domestic sewage
removal rate
