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도시하수처리장의 혐기성소화슬러지에 있어서 황산염환원균의 거동
라원식,서정인,권대원 한국위생과학회 1997 한국위생과학회지 Vol.3 No.1
Behaviors of sulfate-reducing bacteria in anaerobic sludges of five municipal anaerobic sewage treatment plant were investigated to clarify the role of sulfate reducing-bacteria. In all sludges, methane production was mostly inhibited, and accumulation of hydrogen was observed in presence of chloroform, inhibitor for methanogenesis. In the high sulfate-containing sludge, the contribution ratio of hydrogen to methane production was significantly higher than other sludges. On the other hand, methane production was increased by 13% in the presence of molybdate, inhibitor for sulfate-reducing bacteria in all sludges. Also sulfide production increased in a direct proportion with time after addition of 1 mM sulfate. These results Show that sulfate-reducing bacteria could complete with methane-producing bacteria for the common substrates for sulfate-reducing bacteria and methane-producing bacteria except for hydrogen, and degradation of lipids, proteins and carbohydrates of sewage sludge was stimulated by sulfate-reducing bacteria.
황산염저부하조건에서 순양한 혐기성오니에 있어서 황산염환원균의 역할
서정인,라원식,남택호 嶺南大學校 環境問題硏究所 1996 環境硏究 Vol.15 No.2
황산염 저부하조건에서 순양한 혐기성오니에 있어서 황산염환원균의 역활을 명확히 하기 위해 메탄생성과 황화물생성에 대한 황산염, 황화물 및 휘발성지방산의 영향을 검토했다. 메탄생성은 황화물과 황산염의 첨가에 의해서 증가되는 경향을 보였다. 동시에 황산염의 환원에 의해 황화물이 생성되었으며, 그 생성속도는 0.30 μ mol·g VSS^-1·hr^-1이고 첨가한 휘발성 지방산의 종류와 관계가 있었다. 그리고 메탄생성속도는 Acetate를 제외한 휘발성지방산이 산화됨과 동시에 황화물생성속도와 함께 증가하였다. 따라서 황산염환원균은 황산염저부하 혐기성오니하에서 Acetate를 제외한 휘발성지방산을 발효적 대사에 이용하여 서식하는 것으로 판단된다. 그리고, 발효적 대사에 의해 생육하는 황산염환원균은 황산염저부하조건에서 Hydrogen-producing acetogens의 역할을 하는 것으로 추측되었다. The effect of sulfate, sulfide and volatile fatty acids on methane production and sulfide production in anaerobic sludge acclimated with sulfate-poor medium was investigated to clarify the role of sulfidogens. Methane production was shown to be stimulated by the addition of sulfide or sulfate. At the same time, sulfide production was measured in serum bottle test in which the sulfate reduction was measured during incubation. The production rate was 0.30 μ mol·g VSS^-l·hr^-1, and was related to the kinds of added volatile fatty acids. And methane production rate was increased with increasing with sulfide production rate in which oxidation of volatile fatty acids exception of acetate was measured during incubation. These results shows that many sulfidogens should inhabit by their fermentation from volatile fatty acids exception of acetate In sulfate-poor anaerobic sludge. And, fermentative-sulfidogens appear to assume the a role of hydrogen-producing acetogens in sulfate-poor condition.
공단 폐슬러지에 있어서 응집제첨가에 따른 탈수특성에 관한 연구
엄태규,라원식,엄원탁,한기백 嶺南大學校 工業技術硏究所 1992 연구보고 Vol.20 No.1
To reduce the rate of water contained in the sludge of the industrial wastewater, this study was conducted by comparatively considering the dewatering effect according to addition of coagulant and dewaterability properties of sludge. The result of this study is summarized as follows. 1. The dewaterability properties of sludge presented that the suitable difference in pressure necessary a good dewaterability seems to be 200, 300㎜Hg. 2. When adding an ploymer coagulant to the sludge, its dewaterability properties showed that the higher the rate of addition, the better its dewaterability. Also, it appeared that the adequate rate of addition is about 0.3-0.7% when SS concentration of sludge is 18,000㎎/l, and that is about 0.3-0.4% when SS concentration of sludge is 35,000㎎/l, when this rate is more than 0.5%, it was shown that the dewaterability is insufficient due to both initial moment dewaterability and closing condition of the filter basin. 3. When adding 0.4% ploymer coagulant, the adding rate of inorganic coagulant indicated that the more the added inorganic coagulant, the lower the specific resistance. When the rate of addition is more than 9.0%, however, the filter water indicated a light yellow. For the reason, it is expected that the inorganic coagulant flows out ineffectively. It is expected that the adequate rate of inorganic coagulant addition is between 6.0-9.0%, therefore, while it is better to use both polymer and inorganic coagulant for dewatering the sludge.