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KMID : 1024519980070060867
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Journal of the Environmental Sciences
1998 Volume.7 No. 6 p.867 ~ p.873
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Dewatering and Settling Characteristics of Digested Sludge from the Anaerobic Sequencing Batch Reactor for Treatment of Nightsoil
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Lee Joon-Geol
Chang Duk
Hur Joon-Moo
Son Bu-Soon
Jang Bong-Ki
Park Jong-An
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Abstract
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Laboratory study was conducted to provide basic data for operating anaerobic sequencing batch reactor(ASBR) process for treatment of nightsoil. The experiments were concerned with digestion characteristics, settleabiltity and dewaterability of digested sludge in ASBR system. Completely-mixed dally-fed control reactor without solid-liquid separation step was also operated to evaluate the baseline performance since the nature of nightsoil was changed with time. In all case, gas production from the ASBR shows 1.3 to 1.44 times higher than that from control, in spite of almost similar trend in organics removal. During thickening period, remarkable decrease in surface settling velocity was observed at the ASBRs compared with the control. In case of the ASBR run, flotation of mixed digested sludge was not occurred. Also, ultimate thickened volume of ASBRs increased 1.2~1.5 times compared with control. Dewaterability of digested sludge without conditioning decreased when the completely-mixed daily-fed reactor for ASBR run was converted to the ASBR. However, improvement of dewaterability of digested sludge from the ASBRs was observed as a result of addition of FeCl to digested sludge for conditioning.
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KEYWORD
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Dewatering, settling, digested sludge, anaerobic sequencing batch reactor(ASBR), nightsoil
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