Journal
ECOLOGICAL ENGINEERING
Volume 93, Issue -, Pages 120-128Publisher
ELSEVIER
DOI: 10.1016/j.ecoleng.2016.05.033
Keywords
Constructed wetlands; Algal pond; Sewage-filling ways; Microbial carbon source; Water treatment
Funding
- National Natural Science Foundation of China [51279207, 51309503, 51409267]
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Algae can increase dissolved oxygen (DO) in water body by photosynthesis and affect the wastewater treatment performance of constructed wetlands (CWs). Two laboratory-scale vertical flow constructed wetlands combined with algal pond were designed and constructed to treat simulated wastewater in replicated experiments. The two units (half-vertical subsurface flow constructed wetlands and shallow algal pond-vertical subsurface flow constructed wetlands) could decrease chemical oxygen demand (COD), total nitrogen (TN), and total phosphorus (TP) at low temperature condition (0-10 degrees C). The study showed that algal pond significantly improved TN and TP removal by 26.2-30.6% and 16.5-21.2% in CWs, respectively. The COD removal was only increased by 16.8-20.2% probably due to microbial carbon source accumulation originated from dead algae and algal debris. The study suggested that the designed new system with algal pond might be a green water treatment solution. (C) 2016 Elsevier B.V. All rights reserved.
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