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Environmental Engineering Research 2003;8(3): 116-121. DOI: https://doi.org/10.4491/eer.2003.8.3.116
INFLUENCE OF SULFATE AS AN ELECTRON ACCEPTOR ON THE ANAEROBIC HYDROLYSIS AND ACIDOGENESIS OF PARTICULATE ORGANICS
Young-Chae Song, Mi-Kyung Kim, and Jin-Seok Yi
Division of Civil and Environmental System Engineering, Korea Maritime University, Busan 606-791, Korea
Corresponding Author: Young-Chae Song ,Tel: +82-51 -410-4417, Fax: +82-51 -410-4415 , Email: soyc@mail.hhu.ac.kr
Received: December 20, 2002;  Accepted: March 19, 2003.
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ABSTRACT
Influence of sulfate on the anaerobic hydrolysis and acidogenesis of particulate organics was studied in a completely mixed acidogenic reactor. The shattered food waste as a particulate organics was added into the reactor at a daily basis while dilution water containing various concentration of sulfate was continuously supplied. The efficiencies of hydrolysis and acidogenesis at control were 60.1% and 19.4%, respectively while they have increased up to 70.6% and 46.2% respectively at 350 mg/L of the sulfate level in the dilution water. The buffering capacity of the acidogenic system increased with the increase of the sulfate level. The efficiencies of hydrolysis and acidogenesis gradually decreased at over 350 mg/L of the sulfate level in the dilution water. It was caused by the increase of the acidogenesis product used as electron donor for sulfate reduction and inhibition effect of the hydrogen sulfide from sulfate reduction. It could be concluded that sulfate in acidogenesis of particulate organics was used as a useful electron acceptor to create a favorable condition thermodynamically and to produce additional alkalinity for the increase of buffering capacity.
Keywords: acidogenesis | electron acceptor | hydrolysis | particulate organics | sulfate
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