http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : ( Ji-hun Nab ) (검색결과 1 건)
- 무료
- 기관 내 무료
- 유료
-
Co-digestion of Sewage Sludge and Human Waste
( Changmin Lee ),( Byeong-chel Kim ),( Ji-hun Nab ),( Jae Young Kim ) 한국폐기물자원순환학회(구 한국폐기물학회) 2019 ISSE 초록집 Vol.2019 No.-
Low anaerobic degradability of sewage sludge has raised demands for co-digestion with other organic wastes such as food waste, livestock manure and agricultural by-products. Human waste (HW) captured from septic tanks also can be used as a co-digestion substrate through supplying of additional carbon and nutrients. In this study, the possibility of sewage sludge and HW codigestion was investigated. The specific objectives were to 1) compare CH4 generation of primary sludge (PS), excess sludge (ES), HW and their mixtures by biochemical methane potential (BMP) test; 2) identify synergistic co-digestion effects on their biodegradability; 3) elucidate the co-digestion effects based on the changes of physicochemical characteristics by mixing. The test ratios between PS, ES and HW were R1=40:60:0, R2=28:43:30, R3=24:34:42, R4=18:26:56, R5=15:23:62, R6=100:0:0 (PS control), R7=0:100:0 (ES control), R8=0:0:100 (HW control) by dry wt., respectively. The maximum mixing ratio of HW (R5) was determined based on the wet wt. ratio between PS, ES produced in a WWTP, Seoul and HW gathered in the WWTP. The BMP tests were conducted by using the same ratio of substrate to inoculum (1:2 by dry wt.) meaning that the same amount of volatile solids (VS) was added to all test assays. As a result, with the increase of HW ratio, CH<sub>4</sub> generation was increased. This is because the amount of carbon in the same VS of substrate was increased. CH<sub>4</sub> potentials were R1: 174 44, R2: 226 2, R3: 250 16, R4: 268 15, R5: 262 9, R6: 158 1, R7: 164 38, R8: 299 54 mL/g-VS. For CH<sub>4</sub> generation dynamics, codigestion did not affect the lag phase of CH<sub>4</sub> generation. The synergistic effect of co-digestion on the biodegradability, which is the ratio of maximum CH<sub>4</sub> generation to theoretical CH<sub>4</sub> potential, was identified for the mixing assays of PS, ES and HW (R2 - R5) but not for the mixing assay of PS and ES (R1). When the HW was mixed, biodegradability was enhanced by 8 - 16% compared to the weighted average considering the mixing ratio of raw samples. In conclusion, HW can be utilized as a substrate for the co-digestion of sewage sludge by replenishing carbon to increase CH<sub>4</sub> production. And C/N ratio can be balanced to enhance the degradability of the mixed substrate rather than each substrate.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
