Improved production of propionic acid driven by hydrolyzed liquid containing high concentration of l-lactic acid from co-fermentation of food waste and sludge.
This study investigated the feasibility of improved production propionic acid-enriched volatile fatty acid (VFA) from high concentration (Cs) of food waste and waste activated sludge (WAS) via lactic acid pathway by using of Propionibacterium acidipropionici. It was observed that production of l-lactate overwhelmed to d-lactate at first stage, which improved from 3.21 to 35.45gCOD/L with increase of substrate Cs. However, kinetic model analysis indicated that P. acidipropionici growth rate μmax was decreased with increase of l-lactate concentration, which explained second stage free cell fermentation of propionic acid was inhibited when fed by first stage liquid from R-40, R-55 and R-70. Then, the fibrous bed bioreactor was employed to eliminate the feed inhibition. The maximal percentage of propionic acid (68.3%) and production (16.31gCOD/L) was obtained by feeding liquid of R-55, which was improved by 3.33 folds compared to the free cell fermentation.
State Environmental Protection Engineering Centre for Pollution Treatment and Control in Textile Industry, College of Environmental Science and Engineering, Donghua University, 2999 North Renmin Road, Shanghai 201620, China; Jiangsu Tongyan Environm Prod Sci & Technol Co Lt, Yancheng 224000, China.
Xiang
X
Li
State Environmental Protection Engineering Centre for Pollution Treatment and Control in Textile Industry, College of Environmental Science and Engineering, Donghua University, 2999 North Renmin Road, Shanghai 201620, China.
Wenjuan
W
Zhang
State Environmental Protection Engineering Centre for Pollution Treatment and Control in Textile Industry, College of Environmental Science and Engineering, Donghua University, 2999 North Renmin Road, Shanghai 201620, China.
Li
L
Ma
State Environmental Protection Engineering Centre for Pollution Treatment and Control in Textile Industry, College of Environmental Science and Engineering, Donghua University, 2999 North Renmin Road, Shanghai 201620, China.
Sizhou
S
Lai
AgroParis Tech, Paris Institute of Technology For Life, Food & Environmental Science, F-75231 Paris Cedex 05, France.
Shu
S
Zhao
State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China.
Yinguang
Y
Chen
State Environmental Protection Engineering Centre for Pollution Treatment and Control in Textile Industry, College of Environmental Science and Engineering, Donghua University, 2999 North Renmin Road, Shanghai 201620, China. Electronic address: liuyanan@dhu.edu.cn.
Yanan
Y
Liu
D061249:Batch Cell Culture Techniques; D019149:Bioreactors / Q000382:microbiology; D005232:Fatty Acids, Volatile / Q000378:metabolism; D005285:Fermentation / Q000187:drug effects*; D005502:Food; D006868:Hydrolysis; D019344:Lactic Acid / Q000494:pharmacology*; D055620:Optical Phenomena; D011422:Propionates / Q000378:metabolism*; D011424:Propionibacterium / Q000187:drug effects / Q000378:metabolism; D012722:Sewage / Q000382:microbiology*; D014866:Waste Products
D005232:Fatty Acids, Volatile; D011422:Propionates; D012722:Sewage; D014866:Waste Products; D019344:Lactic Acid; C029658:propionic acid
Feed inhibition; Fibrous bed bioreactor; Kinetic model; Propionic acid; l-lactic acid