title: Lactic acid production from acidogenic fermentation of fruit and vegetable wastes.
abstract: This work focused on the lactic acid production from acidogenic fermentation of fruit and vegetable wastes treatment. A long term completely stirred tank reactor (CSTR) lasting for 50 days was operated at organic loading rate (OLR) of 11 gVS/(L d) and sludge retention time (SRT) of 3 days with pH controlled at 4.0 (1-24 day) and 5.0 (25-50 day). The results indicated that high amount of approximately 10-20 g/L lactic acid was produced at pH of 4.0 and the fermentation type converted from coexistence of homofermentation and heterofermentation into heterofermentation. At pH of 5.0, the hydrolysis reaction was improved and the total concentration of fermentation products increased up to 29.5 g COD/L. The heterofermentation was maintained, however, bifidus pathway by Bifidobacterium played an important role.
authors.affiliation: State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China.
authors.forename: Yuanyuan
authors.initials: Y
authors.lastname: Wu
authors.affiliation: State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China.
authors.forename: Hailing
authors.initials: H
authors.lastname: Ma
authors.affiliation: State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China.
authors.forename: Mingyue
authors.initials: M
authors.lastname: Zheng
authors.affiliation: State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China. Electronic address: wkj@tsinghua.edu.cn.
authors.forename: Kaijun
authors.initials: K
authors.lastname: Wang
mesh_terms: D000143:Acids / Q000737:chemistry / Q000378:metabolism*; D001644:Bifidobacterium / Q000378:metabolism; D019149:Bioreactors / Q000382:microbiology; D005285:Fermentation / Q000502:physiology*; D005638:Fruit / Q000378:metabolism* / Q000382:microbiology; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D019344:Lactic Acid / Q000737:chemistry / Q000378:metabolism*; D012037:Refuse Disposal / Q000379:methods; D012722:Sewage / Q000737:chemistry / Q000382:microbiology; D014675:Vegetables / Q000737:chemistry / Q000378:metabolism* / Q000382:microbiology
chemical_list: D000143:Acids; D012722:Sewage; D019344:Lactic Acid
keywords: Acidogenic fermentation; Anaerobic digestion; Fruit and vegetable wastes; Heterofermentation; Lactic acid