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J Korean Soc Environ Eng > Volume 38(8); 2016 > Article
J Korean Soc Environ Eng 2016;38(8): 452-458. doi: https://doi.org/10.4491/KSEE.2016.38.8.452
2상 혐기성 소화에서 음식물쓰레기의 고온 가용화 전처리 pH 영향
이원수1, 강영준2, 서규태1
1창원대학교 환경공학과
2창원대학교 해양플랜트 FEED 공학과
pH Effect at Thermophilic Solubilization Pretreatment of Food Waste in Two Phase Anaerobic Digestion
Won-Soo Lee1, Young-Jun Kang2, Gyu-Tae Seo1
1Department of Environment Engineering, Changwon University
2Department of Eco-friendly Offshore FEED Engineering, Changwon University
Corresponding author  Gyu-Tae Seo ,Tel: 055-213-3746, Fax: 055-281-3011, Email: gts@changwon.ac.kr
Received: June 17, 2016;  Revised: July 7, 2016;  Accepted: July 29, 2016.  Published online: August 31, 2016.
ABSTRACT
The study on pH control at the themophilic solubilization (pretreatment process) was investigated in order to improve the methane gas production of two phase anaerobic digestion of food waste. From a batch experiment, it was observed that the solubilization efficiency was increased from 26.2% to 47.1% and 55.6% by the pH increament from 4.20 ± 0.40 (without pH control) to 7.00 ± 0.50, and 12.00 ± 0.50, respectively. However there was immaterial increase (8.5%) in solubilization efficiency when the pH was increased from 7.00 ± 0.50 to 12.00 ± 0.50. The two phase anaerobic digestion system was operated for laboratory scale experiment under the solubilization condition of pH 4.20 ± 0.40 (Run1) and 7.00 ± 0.50 (Run2). Higher soluble chemical oxygen demand (SCOD) and total volatile fatty acid (TVFA) concentration were observed in Run2 throughout the system resulted by the solubilization effect at the pH 7.00 ± 0.50. The TVFA concentration in acidogenic reactor was 18.4 g/L which was 1.8 times higher than the result of Run1. Consequently the methane gas production was enhanced to 0.333 L/g VS in the methanogenic reactor, which is 18% higher than the result (0.282 L/g VS) of Run1.
Key Words: Thermophilic Solubilization, Methane Gas, Food Waste, Two Phase Anaerobic Digestion, pH Adjustment, Volatile Fatty Acid
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