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Open AccessReview

Constructed Wetlands: A Review on the Role of Radial Oxygen Loss in the Rhizosphere by Macrophytes

by Qian Wang 1,*,†, Yanbiao Hu 1,†, Huijun Xie 2 and Zhongchen Yang 3
1
College of Geography and Environment, Collaborative Innovation Center of Human-Nature and Green Development in Universities of Shandong, Shandong Normal University, Jinan 250358, China
2
Environment Research Institute, Shandong University, Jinan 250100, China
3
College of Environmental Science and Engineering, Peking University, Beijing 100871, China
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Water 2018, 10(6), 678; https://doi.org/10.3390/w10060678
Received: 8 April 2018 / Revised: 19 May 2018 / Accepted: 23 May 2018 / Published: 24 May 2018
(This article belongs to the Section Water and Wastewater Treatment)
Constructed wetlands (CWs) are extensively used as an economical and environmentally friendly sewage treatment under ecological engineering technology. Knowledge of the oxygen in the rhizosphere is of primary importance in understanding the function and regulation of microbial communities and macrophytes. Numerous studies on radial oxygen loss (ROL) have greatly elucidated the mechanism of contaminant removal in CWs. The main sources of oxygen in CWs are atmospheric reoxygenation, macrophyte transmission, and artificial aeration. However, artificial aeration is very expensive, and atmospheric reoxygenation is limited. Therefore, ROL by macrophytes is an essential and economical approach for oxygen input in CWs. In this review, we attempted to study the role of macrophytes in CWs. We described the mechanism of ROL and summarized the methods for determining ROL. We also investigated the role of ROL in contaminant removal in CWs. This review will provide considerable useful information on the oxygen input of CWs. View Full-Text
Keywords: constructed wetlands; radial oxygen loss; rhizosphere; macrophytes; microorganisms constructed wetlands; radial oxygen loss; rhizosphere; macrophytes; microorganisms
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Wang, Q.; Hu, Y.; Xie, H.; Yang, Z. Constructed Wetlands: A Review on the Role of Radial Oxygen Loss in the Rhizosphere by Macrophytes. Water 2018, 10, 678.

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