人工快速渗滤系统对污染物的去除机制

Mechanism of contamination removal in constructed rapid infiltration system

人工快速渗滤系统(CRI)是在传统的污水快速渗滤处理系统(RI)的基础上发展起来的一种新型的污水土地处理技术。通过对CRI的模拟,揭示了非生物机制与生物机制对有机物、营养元素的降解机制。结果表明,CRI对污水中污染物的去除是在非生物机制与生物机制协同作用下完成的。对污水中的有机物和氮的降解以生物机制为主、非生物机制为辅;对磷的降解则以非生物机制为主、生物机制为辅。生物机制对有机物、氮的去除占70%以上,非生物机制对磷的去除占61.9%。系统中氮转化以硝化效果为主,反硝化效果较弱。

Constructed rapid infiltration （CRI） was a new wastewater disposal technology evolved from the conventional rapid infiltration （RI）. Investigations were performed to determine the relative contribution of biodegradation and abiotic interception to the observed removal of TOC and nutrients in a pilot scale CRI system in a Shanghai wastewater treatment plant. Both biodegradation and abiotic interception were important to the removal of organic pollutants and N＆P nutrients. Biodegradation was responsible for removing 〉70% of TOC and the nitrogen nutrient, while abiotic interception was responsible for removing about 61.9% of phosphorus species. Nitrification accounted for most of the overall nitrogen transformation taking place in the CRI system; denitrification was far less important.