Medium chain fatty acids production from anaerobic fermentation of waste activated sludge

Wu，Shu Lin1; Luo，Gang2,3; Sun，Jing1,3; Wei，Wei1; Song，Lan4,5; Ni，Bing Jie1,3

2021-01-10

10.1016/j.jclepro.2020.123482

Journal of Cleaner Production   影响因子和分区

0959-6526

1879-1786

The utilization of waste activated sludge (WAS) to recover energy in the form of methane or short-chain fatty acids (SCFAs) is generally restricted by the low energy density of products and poor degradability of WAS. Herein, this study reported a novel alternative WAS fermentation technology to produce high-energy medium-chain fatty acids (MCFAs) from WAS in a one-stage anaerobic fermentation system using ethanol as electron donor. The MCFAs production and WAS degradation at different ethanol levels were investigated. The increased ethanol levels resulted in increasing MCFAs production (from 1875 to 6115 mg chemical oxygen demand (COD)/L) and selectivity (from 30.3 to 56.2%). The main MCFAs products were n-caproate and n-caprylate at lower level of ethanol, while n-caproate was the sole MCFA product at higher level of ethanol with longer chain alcohol (i.e., n-hexanol) produced as well. The ethanol markedly increased WAS degradation, with the greatest degradation (0.72 g COD/g volatile solids (VS)) being 1.9 times of that without ethanol (0.38 mg COD/mg VS, at 0 mmol/L), which was ascribed to the advancement of sludge solubilization, hydrolysis and acidification. Microbial community revealed that the ethanol participation induced the community shift to the favorable direction for hydrolysis-acidification and chain elongation in anaerobic WAS fermentation.

Anaerobic fermentation Chain elongation Degradation Ethanol Medium-chain fatty acid Waste activated sludge

SCI ; EI

英语

其他

National Natural Science Foundation of China[51578391,51608374] ; State Key Laboratory of Pollution Control and Resource Reuse Foundation, China[PCRRK18007]

Science & Technology - Other Topics ; Engineering ; Environmental Sciences & Ecology

Green & Sustainable Science & Technology ; Engineering, Environmental ; Environmental Sciences

WOS:000595857400006

ELSEVIER SCI LTD

20203409088268

Hydrolysis ; Volatile fatty acids ; Acidification ; Chemical oxygen demand ; Fermentation

Chemical Reactions:802.2 ; Organic Compounds:804.1 ; Food Processing Operations:822.2

2-s2.0-85089563275

Scopus

1.State Key Laboratory of Pollution Control and Resources Reuse,College of Environmental Science and Engineering,Tongji University,Shanghai,200092,China
2.Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP),Department of Environmental Science and Engineering,Fudan University,Shanghai,200433,China
3.Shanghai Institute of Pollution Control and Ecological Security,Shanghai,200092,China
4.School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
5.Shenzhen Institute of Sustainable Development,Shenzhen,518055,China

Wu，Shu Lin,Luo，Gang,Sun，Jing,et al. Medium chain fatty acids production from anaerobic fermentation of waste activated sludge[J]. Journal of Cleaner Production,2021,279.

Wu，Shu Lin,Luo，Gang,Sun，Jing,Wei，Wei,Song，Lan,&Ni，Bing Jie.(2021).Medium chain fatty acids production from anaerobic fermentation of waste activated sludge.Journal of Cleaner Production,279.

Wu，Shu Lin,et al."Medium chain fatty acids production from anaerobic fermentation of waste activated sludge".Journal of Cleaner Production 279(2021).