摘要
为了探寻人工快速渗滤(CRI)系统除磷效率和机制,并优化CRI系统除磷效率和促成CRI系统进一步推广应用,以铁粉和传统CRI常用基质——天然砂为研究对象,在室内相同运行条件下,构筑人工试验土柱(以下简称模型柱)模拟CRI系统,通过监测普通模型柱和加强除磷模型柱中出水TP,分析CRI系统的除磷机制和效率。结果表明:采用天然砂作为滤料主要组分的CRI系统的除磷效率较差,出水TP不能达到《城镇污水处理厂污染物排放标准》(GB 18918—2002)一级B标准(1mg/L),在CRI系统中添加适量铁粉构建的CRI系统对TP的去除率有较大的提高,平均去除率为84.2%,比普通CRI系统高出39.5百分点;CRI系统在滤料层初始段TP去除率最高,随着系统深度的增加,CRI系统对TP的总去除率逐渐升高,但去除速率随着系统深度的增加而降低。
In order to explore the mechanism of phosphorus removal by constructed rapid infiltration（CRI）system,optimize the performance and facilitate the application of the CRI system,the author constructed 2soil columns which filling with coarse sand and iron powder＋coarse sand separately to simulated the CRI system.Two CRI systems were operated under the same conditions for treating sewage,TP concentration in the inlet and outlet of simulation columns was monitored,and the change rules of TP during the operation process was obtained.Results showed that the CRI system with coarse sand as filter presented poor TP removal efficiency,the ultimate effluent TP could not qualify the standard B（≤1mg/L）of Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant（GB 18918-2002）.Adding appropriate amount of iron could obviously improve the TP removal efficiency,TP removal rate increased to 84.2%,which was 39.5percent point higher than common CRI system（filter simulation column 1）. The initial segment of CRI system achieved the highest TP removal efficiency,with increasing the depth of system, more TP in simulation column was removed while the TP removal efficiency was decreased.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2014年第5期29-32,共4页
Environmental Pollution & Control
基金
国家自然科学基金资助项目(No.51109019)
四川省教育厅科研计划项目(No.14ZB0073)
贵阳市社会发展与民生科技计划项目(No.[2012103]65)
高等学校博士学科点专项科研基金资助项目(No.20135122120020)
关键词
人工快速渗滤系统
滤料
TP
除磷效率
constructed rapid infiltration system
filter material
TP
phosphorus removal efficiency
