期刊
JOURNAL OF ENVIRONMENTAL SCIENCES
卷 51, 期 -, 页码 275-283出版社
SCIENCE PRESS
DOI: 10.1016/j.jes.2016.07.008
关键词
Baffled constructed wetland; Combined substrate; Wood-chip; Nitrogen; Removal
资金
- National Natural Science Foundation of China [41401548]
- Jilin Provincial Research Foundation for Basic Research, China [20150520151JH]
- Open Project of State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology [ES201510, HC201622]
Removal of nitrogen in wastewater before discharge into receiving water courses is an important consideration in treatment systems. However, nitrogen removal efficiency is usually limited due to the low carbon/nitrogen (C/N) ratio. A common solution is to add external carbon sources, but amount of liquid is difficult to determine. Therefore, a combined wood-chip-framework substrate (with wood, slag and gravel) as a slow-release carbon source was constructed in baffled subsurface-flow constructed wetlands to overcome the problem. Results show that the removal rate of ammonia nitrogen (NH4+-N), total nitrogen (TN) and chemical oxygen demand (COD) could reach 37.5%-85%, 57.4%-86%, 32.4%-78%, respectively, indicating the combined substrate could diffuse sufficient oxygen for the nitrification process (slag and gravel zone) and provide carbon source for denitrification process (wood-chip zone). The nitrification and denitrification were determined according to the location of slag/gravel and wood-chip, respectively. Nitrogen removal was efficient at the steady phase before a shock loading using slag-wood-gravel combined substrate because of nitrification-denitrification process, while nitrogen removal was efficient under a shock loading with wood-slag-gravel combined substrate because of ANAMMOX process. This study provides a newidea for wetland treatment of high-strength nitrogen wastewater. (C) 2016 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据