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DOI : ,    Vol.7, No.2, 13 ~ 23, 1999
Title
A Basic Study on Anaerobic Treatment Process Using Characteristics of Fermentative Metabolism by Sulfidogens
서정인Jung In Suh
Abstract
In order to the enhancement of the efficient of anaerobic treatment process, the characteristics of fermentative metabolism by sulfidogens were investigated in anaerobic sludge that had been acclimated with glucose under sulfate loads(0 to 0.42 ㎏·SO₄^(2-)/㎥/day), while sulfate was withheld from the each anaerobic sludge that had been fed both glucose and sulfate in the steady-state. With the presence of sulfate, methanogenesis was decreased with increasing sulfate load and conversion ratio of input COD into methane was decreased by 17% at Run 6 (0.4 ㎏·SO₄^(2-)/㎥/day) compared with Run 1 (no sulfate load sludge). However, in the sulfate depletion condition, the conversion ratio of input COD into methane was about 79.3% in all condition. Also, methanogenesis from hydrogen was decreased with increasing sulfate load. However, with sulfate depletion condition, methanogenesis from hydrogen was increased, and contribution ratio of hydrogen to methane reached the maximum at Run 5 (sulfate load was converted 0.31 ㎏·SO₄^(2-)/㎥/day to 0 ㎏·SO₄^(2-)/㎥/day). Also sulfide production was stimulated by propionate, lactate, and pyruvate at sulfate depletion sludge. At the same time, the utilization rate of pyruvate and lactate by sulfidogens was maximized at Run 5. These results showed that some sulfidogen should inhabit by their fermentative metabolism using volatile fatty acids exception of acetate in the absence of sulfate. Thus, fermentative-sulfidogens converted pyruvate, propionate, lactate, etc. to acetate and hydrogen in sulfate depletion condition and then these intermediates were utilized by methanogens.
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