- Estimation of feasibility for Sewage sludge as External Carbon Source Using Respirometer
- Kim, Myoung-Sook ; Kim, Hyeong-Seok ;
- Journal of The Korean Society of Civil Engineers, volume 25, issue 1B, 2005, Pages 83~83
Abstract
In this study, we took advantage of a sonication technology, which has been gradually applied in environment industry nowadays, drew sewage sludge dissolution optimization through sonication to improve sewage sludge disintegration much better, and maximized external carbon source production required at BNR process improvement of occurrence acidogenic fermentation. A series of bench-scale, semi-continuous acidogenic fermentation experiments, using sonicated sludge as a substrate, has been conducted to investigate the effects of sonication methods and HRT control on acidogenic fermentation. We could see the BDCOD from acidogenic fermentation after sonication considerably increase comparing with each control plot. Specifically, the increase was shown more than by 50%, 40% each. For the results of respirometry measurements used to estimate availability as substrate for microbial energy production activity, we figured out that content of COD(BDCOD) easily separable increased after sonication. Because the volatile fatty acids(VFAs) is created abundantly at anaerobic digestion step after sonication of sludge rather than before pretreatment, it could be replaced as external carbon source of BNR process, which means an enormous amount of money saved.