Optimizations on supply and distribution of dissolved oxygen in constructed wetlands: A review

•Oxygen supply and distribution characteristics in different types of CWs are analyzed.•Optimizations of DO in CWs for decontamination purpose are summarized and discussed.•Atmospheric reaeration plays an important role on oxygen intensification. Dissolved oxygen (DO) is one of the most important fa...

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Bibliographic Details
Published in:Bioresource technology 2016-08, Vol.214, p.797-805
Main Authors: Liu, Huaqing, Hu, Zhen, Zhang, Jian, Ngo, Huu Hao, Guo, Wenshan, Liang, Shuang, Fan, Jinlin, Lu, Shaoyong, Wu, Haiming
Format: Article
Language:English
Subjects:
Adsorption
Atmosphere
Characteristics
Constructed wetlands
Dissolved oxygen
Environmental Pollutants - chemistry
Environmental Restoration and Remediation
Gases
Nitrogen - chemistry
Oxygen - chemistry
Phosphorus - chemistry
Plants
Pollutants removal
Supply and distribution
Waste Water
Wetlands
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Summary:•Oxygen supply and distribution characteristics in different types of CWs are analyzed.•Optimizations of DO in CWs for decontamination purpose are summarized and discussed.•Atmospheric reaeration plays an important role on oxygen intensification. Dissolved oxygen (DO) is one of the most important factors that can influence pollutants removal in constructed wetlands (CWs). However, problems of insufficient oxygen supply and inappropriate oxygen distribution commonly exist in traditional CWs. Detailed analyses of DO supply and distribution characteristics in different types of CWs were introduced. It can be concluded that atmospheric reaeration (AR) served as the promising point on oxygen intensification. The paper summarized possible optimizations of DO in CWs to improve its decontamination performance. Process (tidal flow, drop aeration, artificial aeration, hybrid systems) and parameter (plant, substrate and operating) optimizations are particularly discussed in detail. Since economic and technical defects are still being cited in current studies, future prospects of oxygen research in CWs terminate this review.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2016.05.003