Impacts of of salinity on degradation of pollutions in hybrid constructed wetlands

doi:10.1016/j.ibiod.2017.05.018

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Please use this identifier to cite or link to this item: https://ir.cnu.edu.tw/handle/310902800/31662

Title:	Impacts of of salinity on degradation of pollutions in hybrid constructed wetlands
Authors:	Chyan, Jih Ming Huang, Shi Che Lin, Chien Jung
Contributors:	Chia Nan Univ Pharm & Sci, Dept Environm Resources Management Chia Nan Univ Pharm & Sci, Dept Environm Sci & Engn
Keywords:	Constructed wetland Salinity impact Biochemical oxygen demand Ammonia-nitrogen Total phosphorus
Date:	2017-10
Issue Date:	2018-11-30 15:51:59 (UTC+8)
Publisher:	Elsevier Sci Ltd
Abstract:	To investigate the impact of salinity on the pollution removal performance of constructed wetlands (CWs), four sets of hybrid CWs (HCW) were considered herein. The HCW5 were composed of free water surface flow (FWS) and subsurface flow (SSF) CWs that were planted with cattail (Typha orientalis Presl.) and reed (Phragmites communis Trin.), respectively. After a preliminary experiment of almost seven months with influent fresh wastewater, NaCI was added at concentrations of 5 ppt, 10 ppt, and 20 ppt to simulate the impact of salinity. The removal performance was compared with that of the control CWs, and the impact of salinity on FWS CWs, SSF CWs, and HCWs were investigated. According to the experimental results, the biochemical oxygen demand (BOD) removal ratio in FWS CWs decreased from 70.3% to 58.3% as salinity increased from 0 ppt to 20 ppt, while that in SSF CWs fell significantly from 53.5% to 36.9% as salinity increased to >= 10 ppt. However, hybrid CWs offered more stable BOD removal and ammonia-nitrogen (NH3-N) removal under salinity impact. Salinity >= 10 ppt stimulated the removal performance of NH3-N in FWS CWs to 19.4% while salinity <= 5ppt had no significant effect. In SSF CWs, a linear relationship was observed between removal loading and salinity, and NH3-N removal completely ceased at a salinity of 30.6 ppt. All removal ratios of NO3--N>94.9% in FWS CWs revealed that salinity had almost no impact because the environment was anaerobic and contained sufficient organic carbon. The TP removal ratio in FWS CWs decreased from 14.7% to 9.2% as salinity increased from 0.ppt to 20 ppt and that in SSF CWs decreased monotonically from 7.2% to -0.2%. The impact period of salinity showed versatile reaction patterns of pollution removals in FWS CWs, SSF CWs, and HCW5. It distributed from 28 days to 186 days, after which the removal performance of CWs was restored. (C) 2017 Elsevier Ltd. All rights reserved.
Relation:	International Biodeterioration & Biodegradation, v.124, pp.176-187
Appears in Collections:	[Dept. of Environmental Engineering and Science (including master's program)] Periodical Articles [Dept. of Environmental Resources Management] Periodical Articles

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