title: Optimization of VFAs and ethanol production with waste sludge used as the denitrification carbon source.
abstract: An acidification metabolite such as volatile fatty acids (VFAs) and ethanol could be used as denitrification carbon sources for solving the difficult problem of carbon source shortages and low nitrogen removal efficiency. A proper control of environmental factors could be essential for obtaining the optimal contents of VFAs and ethanol. In this study, suspended solids (SS), oxidation reduction potential (ORP) and shaking rate were chosen to investigate the interactive effects on VFAs and ethanol production with waste sludge. It was indicated that T-VFA yield could be enhanced at lower ORP and shaking rate. Changing the SS, ORP and shaking rate could influence the distribution of acetic, propionic, butyric, valeric acids and ethanol. The optimal conditions for VFAs and ethanol production used as a denitrification carbon source were predicted by analyzing response surface methodology (RSM).
authors.affiliation: College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China E-mail: geletu@ouc.edu.cn; Key Laboratory of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China.
authors.forename: Liang
authors.initials: L
authors.lastname: Guo
authors.affiliation: College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China E-mail: geletu@ouc.edu.cn.
authors.forename: Jiawen
authors.initials: J
authors.lastname: Zhang
authors.affiliation: PLA Navy Submarine Academy, Qingdao 266042, China.
authors.forename: Li
authors.initials: L
authors.lastname: Yin
authors.affiliation: College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China E-mail: geletu@ouc.edu.cn.
authors.forename: Yangguo
authors.initials: Y
authors.lastname: Zhao
authors.affiliation: College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China E-mail: geletu@ouc.edu.cn.
authors.forename: Mengchun
authors.initials: M
authors.lastname: Gao
authors.affiliation: College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China E-mail: geletu@ouc.edu.cn.
authors.forename: Zonglian
authors.initials: Z
authors.lastname: She
mesh_terms: D019149:Bioreactors; D002244:Carbon; D058440:Denitrification; D000431:Ethanol / Q000378:metabolism*; D005232:Fatty Acids, Volatile / Q000378:metabolism*; D009584:Nitrogen; D012722:Sewage; D013223:Statistics as Topic; D018505:Waste Management
chemical_list: D005232:Fatty Acids, Volatile; D012722:Sewage; D000431:Ethanol; D002244:Carbon; D009584:Nitrogen