지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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초록· 키워드
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The effect of ultrasound pretreatment on sludge degragability was investigated at different condotions: ultrasonic frequency(28, 40, 50kHz), intensity(10, 25, 50W), sonication time(10, 20, 30, 60min). Total suspended solid(TSS) and soluble chemical oxygen demand(SCOD) concentration were measured for the evaluation of pretreatment efficiency. The pretreated sludge was used as the feedstock for anaerobic digestion process. Biogas production and volatile suspended solid(VSS) removal were determined for evaluating the process performance. 1. TSS concentration of the sludge decreased at a constant rate as sonication operation was applied. The degradation rate of TSS increased when ultrasound frequency was decreased from 50kHz to 28kHz and intensity was increased from 10W to 50W. Efficiency of TSS degradation per input energy increased as ultrasonic frequency and intensity were decreased. At the frequency of 28 and 40kHz, SCOD concentration rapidly increased during the initial 30min of sonication time, and then it gradually increased. At 50kHz, SCOD concentration constantly increased for 60min of the sonication time. The SCOD production rate increased with increasing intensity under all ultrasound frequencies. 2. The optimum condition of ultrasound treatment was 28kHz, 50W and 60min for maximizing the biogas production, methane fraction, VSS removal. The highest values in biogas production, methane fraction in biogas, VSS removal were 370ml, 70%, 2.45g, respectively. Methane production rate per input energy increased at ultrasonic frequency and intensity decreased. 3. When raw sludge was pretreated at the condition of ultrasonic frequency of 28 and 40kHz in series, sequential-frequency sonication, intensity of 50W and 60min, biogas production, methane fraction, VSS removal were about the same that of 28kHz single-frequency sonication. When sequential-frequency sonication of 28 and 50kHz was applied in series, biogas production, methane fraction, VSS removal were 356 ~ 423ml, 69 ~ 71%, 2.41 ~ 2.78g, respectively. The pretreatment efficiency of 28-50kHz sequential-frequency sonication which sonication time of 28kHz and 50kHz was 40min and 20min was higher than that of 28kHz single-frequency sonication.
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참고문헌 (14)
참고문헌 신청
Bougrier, C. / 2004 / Solubilisation of waste activated sludge by ultrasonic treatment / Chem .Eng .Journal 106:163~169
Chu, C .P. / 2001 / Observations on changes in ultrasonically treated waste activated sludge / Wat .Res 35(4):1038~1046
Chyi, Y .T / 1994 / Effects of particulate size in anaerobic acidogenesis using cellulose as a sole carbon source / Water Env,Res 66:670~678
Eastman, J .A / 1981 / Solubilization of particulate organic carbon during the acid phase of anaerobic digestion / J.of WPGF 53(3):352~366
Sivakumar, M. / 2002 / Kinetics of pnitrophenol degradation: effect of reaction conditions and cavitational parameters for a multiple frequency system / Chem .Eng .Jour 85:327~338
Chu, C .P. / 2001 / Observations on changes in ultrasonically treated waste activated sludge / Wat .Res 35(4):1038~1046
Chyi, Y .T / 1994 / Effects of particulate size in anaerobic acidogenesis using cellulose as a sole carbon source / Water Env,Res 66:670~678
Eastman, J .A / 1981 / Solubilization of particulate organic carbon during the acid phase of anaerobic digestion / J.of WPGF 53(3):352~366
Sivakumar, M. / 2002 / Kinetics of pnitrophenol degradation: effect of reaction conditions and cavitational parameters for a multiple frequency system / Chem .Eng .Jour 85:327~338
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