スクロースの酸醗酵に及ぼす硫酸塩還元の影響

概要

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Effects of COD/S ratio and hydraulic retention time (HRT) on the degradation of sucrose in acidogenic phase were evaluated by using anaerobic chemostat at 35°C. The COD/S ratio and HRT were changed in the range of 13 to 3,500 (control) and 2 to 10h, respectively. In order to study the effect of sulfate reduction on the acidogenic phase, the gas production rates of hydrogen, hydrogen sulfide and methane, removal efficiencies of sulfate and sucrose, and sulfide-S concentration were analyzed quantitatively under steady-state condition. Sulfate reduction occurred in acidogenic phase even at 2h of HRT. In particular, sulfate removal efficiency was reached to 46% at COD/S ratio of 13 and to 98% at COD/S ratio of 50 when HRT was longer than 6h. Hydrogen production rate was evidently decreased with decreasing COD/S ratio. Sulfate-reducing bacteria would utilize hydrogen as electron donor in acidogenic phase. Degradation of sucrose was not affected by the free-hydrogen sulfide although the concentration increased up to 99 mg-S·l-1. The results of this study suggested that, with two-phase process, sulfate in wastewater could be effectively removed in acidogenic phase.
社団法人　日本水環境学会の論文
1995-11-10