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DOI : 10.17640/KSWST.2015.23.1.55 ,    Vol.23, No.1, 55 ~ 63, 2015
Title
Nitrification Improvement of Activated Sludge at Low Temperature Using Dewatering Water
안광호 Kwang Ho Ahn , 김광수 Kwang Soo Kim , 김이태 I Tae Kim
Abstract
In a domestic waste water treatment plant(WWTP), the amount of recycle water from an anaerobic digestion tank or sludge thickener is approximately 1% to 3% of inflow rate. The water quality of recycle water is very favorable to dominant microorganism of nitrifying bacteria since nitrogen concentration is higher than organic matter concentration and also alkalinity is high. This study was performed to improve nitrification of activated sludge at low temperature. Lab-scale reactor was operated by introducing dewatering water increased the number of nitrifying bacteria. As a result, nitrification reactor become nitritation due to high NO2--N concentrations at HRT 12hr. Nitrification of activated sludge at 10℃ was further improved by injection of dewatering water compared to that of the aeration tank without injection of dewatering water. The best nitrification efficiency was 10% of the dewatering water supply.
Key Words
dewatering water, recycle water, low temperature, nitrification
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