International Journal of Environmental Sciences

Volume 4 Issue 5 2014- March 2014    Pages: 709-718  <<Previous    Next>>

Application of A2/O bio-reactor & constructed wetlands for removing organic and nutrient concentrations from rural domestic sewage

Author Information:

John Leju Celestino LADU1 2; Lu Xiwu1; Zheng Meiling1, Wei Ting1
1-School of Energy and Environment, Department of Environmental Science and Engineering, Southeast University, Nanjing 210096, P. R. China
2- College of Natural Resources and Environmental Studies, Department of Environmental Studies, University of Juba, South Sudan

ABSTRACT

This paper examined the efficiency of integrated bio-reactor processes (A2/O) combining anaerobic, anoxic, waterfall aeration contact oxidation (oxic) and constructed wetlands for removing organic and nutrient concentrations from rural domestic sewage. The study was carried from June 2012 to November 2012. Chemical oxygen demand (COD), total phosphorus (TP) and total nitrogen (TN) in the effluent from this process was stably below 50 mg/l, 0.6 mg/l and 13.2 mg/l respectively. The results of the system denoted that this integrated process was efficient in organics and nutrients removal from rural domestic sewage. COD was mainlyy removed in anaerobic, anoxic and in waterfall aeration contact oxidation (oxic) columns. Nitrogen was typically reduced by nitrification in contact oxidation unit and denitrification in anaerobic and anoxic column. Constructed wetland played an imperative role in phosphorus removal by filter interception, plant adsorption and microbial transformation. Scraped plaster added in the constructed wetland reacted with orthophosphate and relieved the influence of temperature on phosphorus removal in cold days. Overall, this integrated process was efficient and in rural domestic sewage treatment.

Keywords: A2/O bio-reactor; constructed wetland; rural domestic sewage; waterfall aeration; orthophosphate

.DOI:10.6088/ijes.2014040404511

© 2014 Copyright by the authors, licensee Integrated Publishing Association.This is an open access article distributed under the Creative Commons Attribution License (3.0) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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