earticle

영어

The food waste leachate(FWL) produces from food waste resource plant as a compost and feed. The objective of this study is to investigate the affecting factors on volatile fatty acid(VFA) production in anaerobic acid fermentation of food waste leachate. These factors were pH(4∼7), temperature(15, 25, 35℃) and HRT(1∼5days), NaCl concentration(0.61∼1.62%). The VFA production at temperature of 35℃ was 1.8, 1.6 times higher than those at temperatures of 15℃, 25℃. The solubilization efficiency(Es) of FWL showed the highest value of 47.3% at HRT of 2days, temperature of 35℃. Also the maximum concentration and production rate of VFA under these conditions were 25,556 mg/L and 90%, respectively. These values were showed to decrease as the HRT increased. The major components of VFA produced from the acidogenesis of FWL were the short chain fatty acids such as acetic acid, propoinic acid, and butyric acid. These acids were 73∼80% in composition of VFA. The VFA concentration was decreased about 14% according to the increase of the Cl-(NaCl) concentration from 3,700 mg/L(0.61% NaCl) to 9,800 mg/L(1.62% NaCl).

한국어

음폐수는 퇴비화와 사료화와 같은 음식물류 자원화 시설로부터 발생된다. 본연구의 목적은 음폐수의 혐기성 산발효시 VFA생성에 미치는 영향인자에 대해 조사 분석 하는데 있다. 이들 영향인자는 pH(4∼7), 온도(15, 25, 35℃), 체류시간(1∼5일), NaCl농도(0.61∼1.62%)등이다. 온도 35℃에서 VFA생성은 15℃, 25℃에 비해 각각 1.8배, 1.6배 높았다. 음폐수의 가용화 효율(ES)은 온도 35℃, 체류시간 2일에서 47.3%의 최대값을 나타냈다. 또한 이들 조건에서 VFA농도 및 생성율은 각각 25,556 mg/L, 90%로 가장 높았으며 체류시간이 길어질수록 감소하였다. 음폐수의 산발효시 생성된 VFA의 조성은 acetic acid, propoinic acid, butyric acid와 같은 short chain 유기산으로 73∼80%를 차지하였다. 염분농도 3,700 mg Cl-/L(0.61% NaCl)에서 9,800 mg Cl-/L(1.62%NaCl) 범위에서 염분농도가 증가 할수록 VFA 농도는 약 14% 감소하였다.