Improved waste-activated sludge dewatering using sludge/oil emulsion, ultrasonic and microwave technologies
- Authors
- Kim, Seungjin; Kim, Jong Oh; Chung, Jinwook
- Issue Date
- Oct-2014
- Publisher
- WATER RESEARCH COMMISSION
- Keywords
- emulsion; energy efficiency; microwave; sludge dewatering; ultrasonication
- Citation
- WATER SA, v.40, no.4, pp.677 - 685
- Indexed
- SCIE
- Journal Title
- WATER SA
- Volume
- 40
- Number
- 4
- Start Page
- 677
- End Page
- 685
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/158966
- DOI
- 10.4314/wsa.v40i4.13
- ISSN
- 0378-4738
- Abstract
- Conventional dewatering technologies, such as centrifuges, belt filter presses, and rotary vacuum filters, are not effective methods for treating sewage sludge with high water content. This study evaluated the field-scale feasibility of new technologies that use emulsion, ultrasonication, and microwaves to dewater sludge. Emulsion technology lowered the water content in sludge to 60%, but the overall process was too complex to incorporate into the design of commercial plants due to the requirement for oil-and methanol-recovery facilities. Ultrasonication had low dewatering and energy efficiency with long irradiation times, indicating that it would be difficult to implement in a field plant. The water content of sludge was reduced to 60% within 120 s using microwaves, but dewatering efficiency depended on the thickness and volume of the sludge. In a pilot-scale test, the average energy consumption was 0.54 kWh/kg of water removed, and the final water content of the sludge cake reached 60% within 30 min.
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