The impact of influent mode on nitrogen removal in horizontal subsurface flow constructed wetlands: A simple analysis of hydraulic efficiency and nutrient distribution

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• 作者：Yuhui Wang ; Xinshan Song ; Yi Ding ; Ruihua Niu ; Xiaoxiang Zhao ; Denghua Yan
• 关键词：Constructed wetland ; Influent mode ; Nitrogen removal ; Hydraulic efficiency ; Carbon source distribution
• 刊名：Ecological Engineering
• 出版年：November, 2013
• 年：2013
• 卷：60
• 期：Complete
• 页码：271-275
• 全文大小：1230 K

文摘

Influent mode in constructed wetlands can cause changes of hydraulic efficiency and carbon source distribution. In this study, impacts of four influent modes on nitrogen removal were studied by hydraulic tracer test and nutrient distribution analysis. NH₄⁺-N, TN and COD were sampled along the reactors in different layers. Results showed that diffusive inflow contributed highest NH₄⁺-N and TN removal reaching 64.3% and 60.9%, respectively. It proved that diffusive inflow achieved higher effective volume ratio and hydraulic efficiency. Moreover, nutrient distribution analysis implied that diffusive inflow enhanced reaeration causing efficient NH₄⁺-N reduction. Compared with other modes, diffusive inflow has also resulted in well-distributed carbon source for denitrification in bottom layer. In addition, ANOVA test analyzed the significance among influent modes indicating that diffusive inflow had obvious effects on enhancing nitrogen removal. The study documented the feasibility of using diffusive inflow to enhance the treatment by improving hydraulic conditions and carbon source distribution in CWs.