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J Korean Soc Environ Eng > Volume 37(1); 2015 > Article
J Korean Soc Environ Eng 2015;37(1): 60-68. doi: https://doi.org/10.4491/KSEE.2015.37.1.60
Microwave를 이용한 폐활성슬러지의 가용화 반응에서 강산과 이온성 물질의 첨가가 미치는 영향
이정민1, 이재호1, 임지성1, 김영우1, 변임규2, 박태주1
1부산대학교 사회환경시스템공학부
2부산대학교 환경기술・산업개발 연구소
The Effect of Strong Acid and Ionic Material Addition in the Microwave-assisted Solubilization of Waste Activated Sludge
Jeongmin Lee1, Jaeho Lee1, Jisung Lim1, Youngwoo Kim1, Imgyu Byun2, Taejoo Park1
1School of Civil and Environmental Engineering, Pusan National University
2Institute for Environmental Technology and Industry, Pusan National University
Corresponding author  Taejoo Park ,Tel: 051-510-2432, Fax: 051-514-9574, Email: taejoo@pusan.ac.kr
Received: October 16, 2014;  Revised: November 14, 2014;  Accepted: January 29, 2015.  Published online: January 31, 2015.
The study of waste activated sludge (WAS) solubilization has been increased for sludge volume reduction and enhancing the efficiency of anaerobic digestion. Microwave (MW)-assisted solubilization is an effective method for the solubilization of WAS because this method can lead to thermal, nonthermal effect and ionic conduction by dielectric heating. In this study, the solubilization of WAS by MW heating and conductive heating (CH) was compared and to enhance the MW-assisted solubilization of WAS at low MW output power, chemical agents were applied such as H2SO4 as the strong acid and CaCl2, NaCl as the ionic materials. Compared to the COD solubilization of WAS by CH, that by MW heating was approximately 1.4, 6.2 times higher at 50℃, 100 ℃, respectively and the highest COD solubilization of WAS was 10.0% in this study of low MW output power condition. At the same MW output power and reaction time in chemically agents assisted experiments, the COD solubilization of WAS were increased up to 18.1% and 12.7% with the addition of H2SO4 and NaCl, however, that with the addition of CaCl2 was 10.7%. This result might be due to the fact that the precipitation reaction occurred by calcium ion (Ca2+) and phosphate ion (PO43-) produced in WAS after MW-assisted solubilization. In this study, H2SO4 turned out to be the optimal agent for the enhancement of MW efficiency, the addition of 0.2 M H2SO4 was the most effective condition for MW-assisted WAS solubilization.
Key Words: Microwave-assisted Solubilization, Waste Activated Sludge, COD Solubilization, Strong Acid, Ionic Material
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