河岸渗滤作用脱氮机理及其特点的试验

Experimental Research on Nitrogen-Removal and Its Mechanism During Riverbank Filtration

开展河岸渗滤作用脱氮功能研究对保证饮用水水质安全有重要意义。本文采用室内试验、现场试验及理论分析的方法,研究了河岸渗滤作用脱氮机理及特点。结果表明,河岸渗滤作用脱氮的主要动力是硝化与反硝化作用。河岸渗滤作用过程中先发生硝化作用,后发生反硝化作用,界面位于河床沉积层内,两者速率的匹配与提高,以及增加系统的尺度,可提高河岸渗滤作用的脱氮能力与效率。

Riverbank filtration water is an important component of the drinking production in many countries. It is important to drinking water safety to study the efficacy of riverbank filtration for the removal of nitrogen. The mechanism and characteristics of the removal-nitrogen by the riverbank filtration is studied by inner and field experiments. The results show that, the main mechanism of the removal-nitrogen of the riverbank filtration are nitrification and denitrification, and nitrification is carried on the first passage and denitrification carried latter in flowpath, and their interface existed in sediments. It is the ways to improve the efficacy of riverbank filtration' nitrogen-removal by enhancing and matching nitrification and denitrification, and enlarging the scale of the system.