마이크로파 및 초음파를 이용한 하수슬러지의 전처리 효율 비교 (Comparison of Solubilization Efficiency Using Microwave and Ultrasound for Pre-treatment of Sewage Sludge)

서지정보

· 발행기관 : 한국폐기물자원순환학회
· 수록지 정보 : 한국폐기물자원순환학회지 / 25권 / 6호 / 546 ~ 553페이지
· 저자명 : 한인섭, 이은경, 민병대

초록

Currently, main portion of sludge disposal is ocean dumping, but it will be completely placed in 2011 under an embargo by the 96 Protocol of London Convention. In order to solve this problem, it is necessary that technology is developed and applied towards reducing the production of the sludge such as pre-treatment using microwave and ultrasound. This study focused upon the efficiency of pre-treatment techniques (microwave, ultrasound) for reduction of sewage sludge and improvement in efficiency of anaerobic digestion. For proper comparison, Pre-treatment experiments were carried out at the same volume of sample (500 mL) and same variation of input energy (200, 400, 600, 800, 1000 W). The sludge for experiments was collected from recycle pipeline of activated sludge at J Wastewater Treatment Plant in Seoul, Korea, and then was adjusted to 1.0% and 1.5% total solids concentration through gravity settling. In case of pre-treatment using microwave, solubilization efficiency was maximum 0.0773 (400 W, 5 min) in TS 1.0%, 0.1239 (400 W, 5 min) in TS 1.5%. In addition, ultrasound showed 0.1370 (1000 W, 60 min) in TS 1.0%, 0.3317 (1000 W, 60 min) in TS 1.5%. All pre-treatment methods led to solids solubilization. However, in the same reaction time (5 min), microwave was more efficient than ultrasound in each experimental item (soulbilization efficiency, protein etc.). In conclusion, on the economic evaluation, microwave was more efficient than ultrasound. Also, microwave is applicability in wastewater treatment plants.

영어초록

Currently, main portion of sludge disposal is ocean dumping, but it will be completely placed in 2011 under an embargo by the 96 Protocol of London Convention. In order to solve this problem, it is necessary that technology is developed and applied towards reducing the production of the sludge such as pre-treatment using microwave and ultrasound. This study focused upon the efficiency of pre-treatment techniques (microwave, ultrasound) for reduction of sewage sludge and improvement in efficiency of anaerobic digestion. For proper comparison, Pre-treatment experiments were carried out at the same volume of sample (500 mL) and same variation of input energy (200, 400, 600, 800, 1000 W). The sludge for experiments was collected from recycle pipeline of activated sludge at J Wastewater Treatment Plant in Seoul, Korea, and then was adjusted to 1.0% and 1.5% total solids concentration through gravity settling. In case of pre-treatment using microwave, solubilization efficiency was maximum 0.0773 (400 W, 5 min) in TS 1.0%, 0.1239 (400 W, 5 min) in TS 1.5%. In addition, ultrasound showed 0.1370 (1000 W, 60 min) in TS 1.0%, 0.3317 (1000 W, 60 min) in TS 1.5%. All pre-treatment methods led to solids solubilization. However, in the same reaction time (5 min), microwave was more efficient than ultrasound in each experimental item (soulbilization efficiency, protein etc.). In conclusion, on the economic evaluation, microwave was more efficient than ultrasound. Also, microwave is applicability in wastewater treatment plants.

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