EFFECT OF INFLUENT LOADS ON NITROGEN REMOVAL IN HORIZONTAL SUBSURFACE FLOW CONSTRUCTED WETLANDS WITH CANNA INDICA

文献类型： 外文期刊

第一作者： Zhang, Yan

作者： Zhang, Yan;Liu, Xuelan;Wang, Yueming;Yan, Peipei;Jing, Qingchun;Shi, Tianhong;Dai, Xuejing

作者机构：

关键词： Livestock and poultry breeding wastewaters; Constructed wetlands; Nitrogen removal; Organic matter; Retention time

期刊名称：FRESENIUS ENVIRONMENTAL BULLETIN （ 影响因子：0.489； 五年影响因子：0.479 ）

ISSN： 1018-4619

年卷期： 2018 年 27 卷 2 期

页码：

收录情况： SCI

摘要： The discharge of livestock and poultry breeding wastewaters (LPWs) with high pollution load, particularly wastewater from broiler houses, has increased. This study performed simulation experiments on horizontal subsurface constructed wetlands (HF-CWs) with Canna indica to examine the effect of influent loads on the efficiency of nitrogen removal from wastewater from broiler houses. The results indicated that the removal of different forms of nitrogen was influenced by microorganisms, plants, influent loads and retention time. Plants and retention time accelerated the removal rate of nitrogen; however, high influent loads decelerated the nitrogen removal rate, particularly for ammonium nitrogen (NH4+-N). Moreover, organic matter in water promoted total nitrogen (TN) removal and, in particular, nitrate nitrogen (NO3--N) removal, by enhancing the activity of denitrifying bacteria. This enhanced removal might explain the low NO3--N concentrations observed in wastewaters from livestock and poultry breeding. Furthermore, our results indicate that HF-CWs with Canna indica may be suitable for treating wastewater from livestock and poultry breeding that meet the "Discharge Standard of Pollutants for Livestock and Poultry Breeding" (GB18596-2001). However, HF-CWs with Canna indica should not be used to treat wastewaters from livestock and poultry breeding directly; certain improvements are still needed for their application.

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