Journal
BIORESOURCE TECHNOLOGY
Volume 162, Issue -, Pages 373-378Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2014.03.108
Keywords
Activated sludge; Anoxic-oxic; Nitrification; Recycling sludge; Wastewater treatment
Funding
- Higher Education Commission (HEC), Govt. of Pakistan under the scholarship program titled: MS Level Training in Korean Universities/Industry
- Basic Science Research Program
- Priority Research Centers Program through the National Research Foundation of Korea - Ministry of Education [2013R1A1A4A01008000, 2009-0093819]
- National Research Foundation of Korea [2013R1A1A4A01008000] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This study investigated a bench-scale anoxic-oxic activated sludge system for integrated removal of COD and nitrogen. The experimental unit includes four chambers and continuous feeding in first chamber without recycle of nitrified liquid from aerobic to anoxic chamber unlike the conventional anoxic-oxic process. Recycled excessive sludge was used for the purpose of recycling nitrified mixed liquor. Synthetic wastewater with average loading rates of 0.53 kg COD/m(3)/d and 0.067 kg NH4+-N/m(3)/d was fed to the reactor system at hydraulic residence times (HRT) of 24 and 18 h. The results of 100 days operation showed high removal efficiencies of organic matter of about 97% as total COD and more than 99% removal of ammonia-nitrogen. In anoxic-oxic operation phase, total inorganic nitrogen (TIN) removal was about 66% by pre-denitrification. Moreover, the solid liquid separation through final clarifier was excellent without any suspended solid in the effluent. (C) 2014 Elsevier Ltd. All rights reserved.
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