Removal of nitrogenous compounds from polluted river water by floating constructed wetlands using rice straw and ceramsite as substrates under low temperature conditions
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- 作者：Wenping Caoa ; b ; wenpingcao2013@163.com" class="auth_mail" title="E-mail the corresponding author ; Yinmei Wanga ; Ling Suna ; Jinlong Jiangb ; Yanqiu Zhangc
- 关键词：Floating constructed wetlands (FCWs) ; Bio-remediation ; Low temperature ; Nitrogenous compounds removal ; Substrates
- 刊名：Ecological Engineering
- 出版年：2016
- 出版时间：March 2016
- 年：2016
- 卷：88
- 期：Complete
- 页码：77-81
- 全文大小：732 K
文摘
To reduce the loading of nitrogenous compounds under low temperature conditions (4.3–9.2 °C), we used two floating constructed wetlands (FCWs), assembled from either rice straw (FCW-RS) or light ceramsite (FCW-LC) as a substrate for microorganisms and macrophytes. Under batch conditions, the concentrations of total nitrogen (TN), ammonium nitrogen (NH4+
N), nitrate nitrogen (NO3−N) and nitrite nitrogen (NO2−N) in raw water were 1.32–2.97, 0.50–1.32, 0.41–1.10, and 0.18–1.24 mg/L. The average removal rates of TN, NO3−N and NH4+N after 7 d using FCW-RS and FCW-LC were 78.2%, 62.1%, 81.2% and 65.5%, 42,2%, 71.6%, respectively. Both the FCW-RS and FCW-LC systems proved to be proficient in nitrogenous compounds removal, and FCW-RS showed less NO2−N accumulation.
N), nitrate nitrogen (NO3−N) and nitrite nitrogen (NO2−N) in raw water were 1.32–2.97, 0.50–1.32, 0.41–1.10, and 0.18–1.24 mg/L. The average removal rates of TN, NO3−N and NH4+N after 7 d using FCW-RS and FCW-LC were 78.2%, 62.1%, 81.2% and 65.5%, 42,2%, 71.6%, respectively. Both the FCW-RS and FCW-LC systems proved to be proficient in nitrogenous compounds removal, and FCW-RS showed less NO2−N accumulation.