摘要
采用海砂、校园土按一定比例混合作为快滤介质,构建人工土快滤系统用以处理生活污水,实验测定了不同介质的渗透系数,考察了快滤系统的运行情况、对污染物的去除效果。结果表明,砂土混合物具有良好的渗透性;在砂土体积比1.5:1,淹水时间、落干时间分别为8、24 h,水力负荷0.5 m/d的条件下,系统对COD、NH4+-N去除率分别达到80%、88%,出水中该2项指标达到了GB 18918-2002一级标准A标准;出水中硝态氮含量较高,TN去除效果并不理想,污水在系统中水力停留时间过短限制了反硝化作用。此外,砂土体积比为1:1的混合人工土快滤系统尽管有良好的有机物处理效果,但运行一段时间后出现砂土分层现象,系统不能持久运行。
A constructed rapid infiltration （CRI） was developed to treat municipal wastewater with mixture of sea sand and campus soil of different volume ratio. Tests were conducted to investigate infiltration medium＇s permeability coefficient, operation performance and pollutants＇ removal effect of CRI. The results showed that mixture of sea sand and campus soil exhibited a good permeability. COD and NH4＋-N removal efficiency of CRI could reach 80%, 88%, respectively, under the conditions of sea sand and campus soil ratio of 1.5：1, wet time of 8 h, dry time of 24 h, hydraulic loading of 0.5 m/d. COD and NH4＋-N concentration in effluent could be up to A standard in the national discharge standard of pollutants for municipal wastewater treatment plant （GB 18918--2002）. Nitrate and total nitrogen concentration in effluent was high, which is limited by short hydraulic retention time. Furthermore, despite excellent organics removal efficiency of CRI with sand and soil ratio of 1 ： 1, operation was not persistent due to stratification of mixture of sand and soil.
出处
《水处理技术》
CAS
CSCD
北大核心
2014年第5期95-98,共4页
Technology of Water Treatment
基金
烟台市科学技术发展计划项目(2005226)
关键词
人工土快滤
沙土混合物
湿干比
水力负荷
去除率
constructed rapid infiltration
mixture of sand and soil
wet/dry ratio
hydraulic loading
removal efficiency
