title: Harnessing dark fermentative hydrogen from pretreated mixture of food waste and sewage sludge under sequencing batch mode.
abstract: Food waste and sewage sludge are the most abundant and problematic organic wastes in any society. Mixture of these two wastes may provide appropriate substrate condition for dark fermentative biohydrogen production based on synergistic mutual benefits. This work evaluates continuous hydrogen production from the cosubstrate of food waste and sewage sludge to verify mechanisms of performance improvement in anaerobic sequencing batch reactors. Volatile solid concentration and mixing ratio of food waste and sludge were adjusted to 5 % and 80:20, respectively. Five different hydraulic retention times (HRT) of 36, 42, 48, 72, and 108 h were tested using anaerobic sequencing batch reactors to find out optimal operating condition. Results show that the best performance was achieved at HRT 72 h, where the hydrogen yield, the hydrogen production rate, and hydrogen content were 62.0 mL H2/g VS, 1.0 L H2/L/day, and ~50 %, respectively. Sufficient solid retention time (143 h) and proper loading rate (8.2 g COD/L/day as carbohydrate) at HRT 72h led to the enhanced performance with better hydrogen production showing appropriate n-butyrate/acetate (B/A) ratio of 2.6. Analytical result of terminal-restriction fragment length polymorphism revealed that specific peaks associated with Clostridium sp. and Bacillus sp. were strongly related to enhanced hydrogen production from the cosubstrate of food waste and sewage sludge.
authors.affiliation: Jeju Global Research Center, Korea Institute of Energy Research, 200 Haemajihaean-ro, Gujwa-eup, Jeju, 695-971, Korea.
authors.forename: Joo-Youn
authors.initials: JY
authors.lastname: Nam
authors.affiliation: Department of Civil Engineering, Inha University, 253 Yonghyun-dong, Namgu, Incheon, 402-751, Korea.
authors.forename: Dong-Hoon
authors.initials: DH
authors.lastname: Kim
authors.affiliation: Department of Environmental Engineering, Daegu University, 201 Daegudae-ro, Gyeongsan, Gyeongbuk, 712-714, Korea.
authors.forename: Sang-Hyoun
authors.initials: SH
authors.lastname: Kim
authors.affiliation: School of Civil and Environmental Engineering, Kumoh National Institute of Technology, 61 Daehak-ro, Gumi, Gyeongbuk, 730-701, Korea.
authors.forename: Wontae
authors.initials: W
authors.lastname: Lee
authors.affiliation: Department of Civil and Environmental Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon, 305-338, Korea.
authors.forename: Hang-Sik
authors.initials: HS
authors.lastname: Shin
authors.affiliation: Department of Environmental Engineering, Chonbuk National University, 567 Baekjedae-ro, Deokjin-gu, Jeonju, Jeonbuk, 561-756, Korea. hyunwoo@jbnu.ac.kr.
authors.forename: Hyun-Woo
authors.initials: HW
authors.lastname: Kim
mesh_terms: D000693:Anaerobiosis; D001407:Bacillus / Q000235:genetics; D061249:Batch Cell Culture Techniques; D056804:Biofuels / Q000032:analysis; D019149:Bioreactors; D003013:Clostridium / Q000235:genetics; D005285:Fermentation; D005502:Food; D005735:Garbage; D006859:Hydrogen / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D058889:Molecular Typing; D012150:Polymorphism, Restriction Fragment Length; D012722:Sewage / Q000737:chemistry*
chemical_list: D056804:Biofuels; D012722:Sewage; D006859:Hydrogen
keywords: Dark fermentative hydrogen; Food wastes; Pretreatment; Sequencing-batch; Sewage sludge