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Nitrogen and phosphorus removed from a subsurface flow multi-stage filtration system purifying agricultural runoff

文献类型： 外文期刊

作者： Zhao, Yaqi 1 ; Huang, Lei 1 ; Chen, Yucheng 1 ;

作者机构： 1.Southwest Univ, Coll Resource & Environm, Key Lab Three Gorges Reservoir Reg Ecoenvironm, Minist Educ, Chongqing 400715, Peoples R China

2.Chongqing Key Lab Agr Resources & Environm, Chongqing 400716, Peoples R China

关键词： Agricultural runoff; loading; multi-stage filtration system; nitrogen; phosphorus

期刊名称：ENVIRONMENTAL TECHNOLOGY （ 影响因子：2.2； 五年影响因子：2.4 ）

ISSN： 0959-3330

年卷期： 2018 年 39 卷 13 期

页码：

收录情况： SCI

摘要： Agricultural nonpoint source pollution has been increasingly serious in China since the 1990s. The main causes were excessive inputs of nitrogen fertilizer and pesticides. A multi-stage filtration system was built to test the purification efficiencies and removal characteristics of nitrogen and phosphorus when treating agricultural runoff. Simulated runoff pollution was prepared by using river water as source water based on the monitoring of local agricultural runoff. Experimental study had been performed from September to November 2013, adopting 12h for flooding and 12h for drying. The results showed that the system was made adaptive to variation of inflow quality and quantity, and had good removal for dissolved total nitrogen, total nitrogen, dissolved total phosphorus (DTP), and total phosphorus, and the average removal rate was 27%, 36%, 32%, and 48%, respectively. Except nitrate, other forms of nitrogen and phosphorus all decreased with the increase of stages. Nitrogen was removed mainly in particle form the first stage, and mostly removed in dissolved form the second and third stage. Phosphorus was removed mainly in particulate during the first two stages, but the removal of particulate phosphorus and DTP were almost the same in the last stage. An approximate logarithmic relationship between removal loading and influent loading to nitrogen and phosphorus was noted in the experimental system, and the correlation coefficient was 0.78-0.94.

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