The object of this study is to feasibility assesment for co-digestion efficiency of food waste recycling wastewater(FWR) with thermal hydrolysis process dehydration cake (THP Sludge). As a result of THP pre-treatment experimental conditions to 160oC and 30 minutes, the solubility rate(conversion rate of TCOD to SCOD) of the THP sludge increased by 34%. And the bio-methane potential in the THP sludge increased by about 1.42 times from 0.230 to 0.328 m3 CH4/kg VS compared to the non-pre-treatment. The substrates of the co-digestion reactor were FWR and THP sludge at a 1:1 ratio. Whereas, only FWR was used as a substrate in the digestion reactor as a control group. The experimental conditions are 28.5 days of hydraulic retention time(HRT) and 3.5 kg VS/m3-day of organic loading rate(OLR). During the 120 days operation period, the co-digestion reactor was able to operate stably in terms of water quality and methane production, but the FWR digestion reactor deteriorated after 90 days, and methane production decreased to 0.233 m3 CH4/kg VS, which is 67% of normal condition. After 120 days of the experiment, organic loading rate(OLR) of co-digestion reactor was gradually increased to 4.5 kg VS/m3-day and operated for 80 days. Methane production during 80 days was evaluated to be good at the level of 0.349 m3 CH4/kg VS. As a result of evaluating the dehydration efficiency of the sludge before/after 150-180oC THP using a filter press, it was confirmed that the moisture content of the sludge treated before THP at 180oC was 75% and improved by 8% from 83-85% level. Therefore, it is expected that the co-digestion reactor of FWR and THP sludge will ensure stable treatment water quality and increase bio-methane production and reduction effect of dehydration sludge volume.

ABSTRACT
1. 서 론
2. 실험재료 및 방법
    2.1 음폐수 및 하수슬러지의 성상
    2.2 열가수분해
    2.3 잠재적 메탄발생량 (BMP : Biochemical MethanePotential)
    2.4 혐기소화
    2.5 필터프레스
3. 결과 및 고찰
    3.1 열가수분해 가용화율에 따른 시료 선정
    3.2 음폐수 단독처리, 음폐수/열가수분해 하수슬러지병합처리 메탄발생량 평가
    3.3 혐기소화 처리수 수질 평가
    3.4 탈수성 평가
    3.5 경제성 평가
4. 결 론
References

• 허 준(인하대학교 공학대학원 환경공학과) | Heo Jun (Department of Environmental Engineering, Graduate School of Engineering, Inha University) Corresponding author