EFFECT OF COD/S RATIO ON SULFATE REDUCTION AND THE CHARACTERISTICS OF SUCROSE DEGRADATION IN ACIDOGENIC PHASE

Abstract

The effects of COD/S ratio and HRT on sulfate reduction and the characteristics of sucrose degradation in acidogenic phase were investigated by using continuous anaerobic chemostat reactor at 35°C. Sulfate reduction occurred in acidogenic phase even at HRT of 2h and influent sulfate was effectively removed at HRT of 6 to 10h. Sucrose degradation was not inhibited although total sulfide and free-H₂S increased up to 187mg·1^-1, 99mgS·1^-1, respectively. The metabolites, especially H₂, ethanol and lactate production in acidogenesis were significantly influenced by COD/S ratio.