title: Growth condition and bacterial community for maximum hydrolysis of suspended organic materials in anaerobic digestion of food waste-recycling wastewater.
abstract: This paper reports the effects of changing pH (5-7) and temperature (T, 40-60 degrees C) on the efficiencies of bacterial hydrolysis of suspended organic matter (SOM) in wastewater from food waste recycling (FWR) and the changes in the bacterial community responsible for this hydrolysis. Maximum hydrolysis efficiency (i.e., 50.5% reduction of volatile suspended solids) was predicted to occur at pH 5.7 and T = 44.5 degrees C. Changes in short-chain volatile organic acid profiles and in acidogenic bacterial communities were investigated under these conditions. Propionic and butyric acids concentrations increased rapidly during the first 2 days of incubation. Several band sequences consistent with Clostridium spp. were detected using denaturing gel gradient electrophoresis. Clostridium thermopalmarium and Clostridium novyi seemed to contribute to butyric acid production during the first 1.5 days of acidification of FWR wastewater, and C. thermopalmarium was a major butyric acid producer afterward. C. novyi was an important propionic acid producer. These two species appear to be important contributors to hydrolysis of SOM in the wastewater. Other acidogenic anaerobes, Aeromonas sharmana, Bacillus coagulans, and Pseudomonas plecoglossicida, were also indentified.
authors.affiliation: Department of Civil, Environmental, and Architectural Engineering, Korea University, Anam-dong, Seongbuk-gu, Seoul 136-701, Republic of Korea.
authors.forename: Man Deok
authors.initials: MD
authors.lastname: Kim
authors.forename: Minkyung
authors.initials: M
authors.lastname: Song
authors.forename: Minho
authors.initials: M
authors.lastname: Jo
authors.forename: Seung Gu
authors.initials: SG
authors.lastname: Shin
authors.forename: Jee Hyeong
authors.initials: JH
authors.lastname: Khim
authors.forename: Seokhwan
authors.initials: S
authors.lastname: Hwang
mesh_terms: D000693:Anaerobiosis; D001419:Bacteria / Q000145:classification / Q000254:growth & development* / Q000378:metabolism*; D001673:Biodegradation, Environmental; D019149:Bioreactors; D020148:Butyric Acid / Q000378:metabolism; D003247:Conservation of Natural Resources; D005285:Fermentation; D005502:Food; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D011422:Propionates / Q000378:metabolism; D013696:Temperature; D014865:Waste Disposal, Fluid; D014866:Waste Products; D014871:Water Microbiology
chemical_list: D011422:Propionates; D014866:Waste Products; D020148:Butyric Acid; C029658:propionic acid