도시하수슬러지의 혐기성소화시 고액분리 특성에 미치는 소화온도의 영향
(주)코리아스칼라
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- 2023.08.28
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- 1994.01
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서지정보
ㆍ발행기관 : 대한상하수도학회
ㆍ수록지정보 : 상하수도학회지 / 8권 / 1호
ㆍ저자명 : 한장운, 장덕, 김성순
영어 초록
Laboratory experiments were conducted to investigate the effect of digestion temperature on the settleability and dewaterability of anaerobically digested sludge. The digesters were operated at a hydraulic retention time of 20 days with a loading rate of 0.63~0.66kg volatile solids per cubic meter per day at the temperature of $35^{circ}C$ and $55^{circ}C$. A mixed primary and secondary municipal sludge was used as a feed. The interface height of the sludge during settling test was recorded to identify settleability. As a measure of dewaterability of the sludge, specific resistance and capillary suction time were also measured with and without chemical conditioning. Higher digestion efficiency was obtained at $55^{circ}C$ than $35^{circ}C$. However, the settleability and dewaterability of the sludge at $35^{circ}C$ were quite higher than those of the sludge digested at $55^{circ}C$. The optimum dosages of ferric chloride for sludge conditioning were 0.4% and 0.6% at $35^{circ}C$ and $55^{circ}C$, respectively. The filtrate COD of the sludge digested at $55^{circ}C$ was higher than at $35^{circ}C$, which means that poor dewaterability of the sludge result in high filtrate COD.
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