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2014 (Vol. 7, Issue: 2)
Article Information:

Experimental Study on Anoxic/Oxic Bioreactor and Constructed Wetland for Rural Domestic Wastewater Treatment

John Leju Celestino Ladu, Xiwu Lu and Ahmed Mohammed Osman
Corresponding Author:  Xiwu Lu 

Key words:  Alkalinity, denitrification, Hydraulic Retention Time (HRT), nitrification, recycle ratios, ,
Vol. 7 , (2): 354-363
Submitted Accepted Published
April 19, 2013 May 03, 2013 January 10, 2014
Abstract:

This study examined the removal of nutrients from the domestic wastewater through the application of integrated anoxic/oxic (A/O) bio-reactor and constructed wetland system. Influent and effluent samples were collected from the system and experimented for Chemical Oxygen Demand (COD), NH4+-N, NO3--N and TP in the laboratory. Different Hydraulic Retention Time (HRT) and recycle ratios were applied in the reactor to evaluate their influence on removal efficiency of nutrients. The temperature was controlled between 20 to 24C and pH ranges was 7.6-8.1. The result revealed average COD removal efficiencies of 47, 68, 74, 83 and 85% at HRT of 1.5, 4, 2, 3 and 5 h. The average removal of NH4+-N was 60.3, 63.0, 64.4, 71 and 91.8 % operated with HRT of 2, 3, 5, 1.5 and 4 h, respectively. The average removal of NO3- -N was 92, 94, 95 and 97% run with HRT of 2, 1.5, 3, 5 and 4 h, respectively. The average removal of TP was 78, 85, 88 and 89% operated with HRT of 5, 3, 2 and 1 h. This system removed up to 74.1, 94.4 and 85% of NH4+-N, NO3- -N and TP with proper pH control using external source of alkalinity. The result showed the optimum recycle ratio of 3. The results obtained attest that, the integrated anoxic/oxic bioreactor and constructed wetland is feasible and efficient for wastewater treatment.
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  Cite this Reference:
John Leju Celestino Ladu, Xiwu Lu and Ahmed Mohammed Osman, 2014. Experimental Study on Anoxic/Oxic Bioreactor and Constructed Wetland for Rural Domestic Wastewater Treatment.  Research Journal of Applied Sciences, Engineering and Technology, 7(2): 354-363.
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ISSN (Online):  2040-7467
ISSN (Print):   2040-7459
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