가축분뇨의 신재생연료 활용을 위한 발효과정 유래 악취 저감 연구

When livestock manure is processed into solid fuel, it can have huge benefits. This process not only provides a new energy source but helps initiate the recycling process. However, one large hurdle to the conversion of livestock manure into renewable energy is the generation of environmentally toxic and unpleasant odorous gas from fermentation of livestock manure. In this study, we developed an optimized odor reduction system to reduce odors down to environmentally acceptable level. The odor reduction system is operated via serial steps, including chemical treatment using alkali solutions, photooxidation treatment using UV and ozone, and plasma treatment before releasing the gas into air. At each reduction step, odor gas was collected and analyzed by Ewha Environment Co., Ltd, a certified gas analysis institute. The results demonstrate that the concentrations of ammonia, hydrogen sulfide, dimethyl sulfide, and methylmercaptan, which are the main causes of odor, were reduced to lower levels than acceptable values. Dimethyl disulfide, trimethylamine, n-butyric acid, n-valeric acid, and isovaleric acid were not detected.