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DOI : ,    Vol.5, No.4, 3 ~ 12, 1997
Title
Comparison of Advanced Step Aeration(ASA) and Activated Sludge Processes on Nitrogen and Phosphorus Removal
강용태Yong Tae Kang,현길수Kil Soo Hyun,한동우Dong Woo Han
Abstract
For the improvement of effluent quality through nitrogen(N) and phosphorus(P) removal, this research was performed to investigate and analyse the effects of the biological wastewater treatment processes such as Advanced Step Aeration(ASA) and activated sludge processes on cosi-effectiveness operatings and improvement of effluent wastewater quality. The ASA system which was developed by the author for enchancing the efficiency of the conventional activated sludge process(CASP) consist of anoxic sludge tank, anaerobic, aerobic, anoxic, and aerobic tanks in series with all sludge to first tank and the feed distributed to the second and fourth. The pilot-scale plant experiment of the ASA system was carried out at D Wastewater Treatment Plant located at M city. The results shows that the hydraulic retention time(HRT) of the ASA system could be shorter than the CASP through the step feed of raw wastewater to anaerobic and anoxic tanks. The effect of it on nitrogen removal could be maximized by a twice denitrification by endorgeous respiration in the anaerobic and the anoxic reactors. The return sludge to anoxic sludge tank promoted both additional denitrification and maximized release of phosphorus. Due to the above results, the effect of the ASA system on N and P removal was considerably effective in the range of 85 to 90% for N and 90 to 95% for P, respectively. The above results indicate the ASA system is very cost-effectiveness system for N and P removal with an applicable to domestic wastewater with low strength.
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