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Title: An innovative wood-chip-framework substrate used as slow-release carbon source to treat high-strength nitrogen wastewater
Author: H. Li, Z. F. Chi, B. X. Yan, L. Cheng and J. Z. Li
Corresponding Author: 李怀
Source: Journal of Environmental Sciences
Issued Date: 2017
DOI: 10.1016/j.jes.2016.07.008
Volume: 51, Pages:275-283
Abstract: 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.
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Content Type: 期刊论文
URI: http://ir.iga.ac.cn/handle/131322/7575
Appears in Collections:湿地与全球变化学科组_期刊论文

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