Vertical-flow constructed wetlands treating domestic wastewater contaminated by hydrocarbons

Al-Isawi, R, Sani, A, Almuktar, S and Scholz, M ORCID: 2015, 'Vertical-flow constructed wetlands treating domestic wastewater contaminated by hydrocarbons' , Water Science and Technology, 71 (6) , pp. 938-946.

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The aim was to compare the impact of different design (aggregate size) and operational (contact time, empty time and chemical oxygen demand (COD) loading) variables on the long-term and seasonal performance of vertical-flow constructed wetland filters operated in tidal flow mode before and after a one-off spill of diesel. Ten different vertical-flow wetland systems were planted with Phragmites australis (Cav.) Trin. ex Steud. (common reed). Approximately 130 g of diesel fuel was poured into four wetland filters. Before the spill, compliance with secondary wastewater treatment standards was achieved by all wetlands regarding ammonia-nitrogen (NH4-N), nitrate-nitrogen (NO3-N) and suspended solids (SS), and non-compliance concerning biochemical oxygen demand and ortho-phosphate-phosphorus (PO4-P). Higher COD inflow concentrations had a significantly positive impact on the treatment performance for COD, PO4-P and SS. The wetland with the largest aggregate size had the lowest mean NO3-N outflow concentration. However, the results were similar regardless of aggregate size and resting time for most variables. Clear seasonal outflow concentration trends were recorded for COD, NH4-N and NO3-N. No filter clogging was observed. The removal efficiencies dropped for those filters impacted by the diesel spill. The wetlands system shows a good performance regarding total petroleum hydrocarbon removal.

Item Type: Article
Themes: Built and Human Environment
Schools: Schools > School of Computing, Science and Engineering > Salford Innovation Research Centre
Journal or Publication Title: Water Science and Technology
Publisher: IWA Publishing
Refereed: Yes
ISSN: 0273-1223
Related URLs:
Funders: Funder not known
Depositing User: B Li
Date Deposited: 17 Mar 2015 14:46
Last Modified: 27 Aug 2021 20:14

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