title: Factors affecting on hythane bio-generation via anaerobic digestion of mono-ethylene glycol contaminated wastewater: Inoculum-to-substrate ratio, nitrogen-to-phosphorus ratio and pH.
abstract: This study aims to assess the effect of inoculum-to-substrate ratio (ISR) and nitrogen-to-phosphorus balance on hythane production from thermophilic anaerobic decomposition of mono-ethylene glycol (MEG) contaminated wastewater. ISRs ranging from 2.65 to 13.23gVSS/gCOD were employed, whereas the tested N/P ratios varied from 4.6 to 8.5. Maximum methane and hydrogen yields (MY and HY) of 151.86±10.8 and 22.27±1.1mL/gCODinitialwere achieved at ISRs of 5.29 and 3.78gVSS/gCOD, respectively. HY increased 1.45-fold by decreasing N/P from 8.5 to 4.6, while MY improved 1.6-fold by increasing N/P from 4.6 to 5.5. Methane production was strongly influenced by initial NH4-N, compared to initial PO4-P. Optimal HY of 47.55mL/gCODinitialwas achieved at pH 5.0 and ISR of 3.78gVSS/gCOD using thermal-treated sludge. Three-dimensional regression model was applied for the combined effect of initial MEG, NH4-N and PO4-P on hythane production. Potential economic benefits of hythane production from MEG contaminated wastewater were assessed.
authors: Department of Civil and Environmental Engineering, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8552, Japan; Environmental Engineering Department, Egypt-Japan University of Science and Technology (E-JUST), P.O. Box 179, New Borg Al-Arab City, 21934 Alexandria, Egypt. Electronic address: elreedy.a.aa@m.titech.ac.jp.
authors: Ahmed
authors: A
authors: Elreedy
authors: Department of Civil and Environmental Engineering, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8552, Japan.
authors: Manabu
authors: M
authors: Fujii
authors: Environmental Engineering Department, Egypt-Japan University of Science and Technology (E-JUST), P.O. Box 179, New Borg Al-Arab City, 21934 Alexandria, Egypt. Electronic address: ahmed.tawfik@ejust.edu.eg.
authors: Ahmed
authors: A
authors: Tawfik
mesh_terms: D000693:Anaerobiosis; D019149:Bioreactors; D019855:Ethylene Glycol / Q000032:analysis* / Q000737:chemistry; D009584:Nitrogen / Q000032:analysis* / Q000737:chemistry; D010758:Phosphorus / Q000032:analysis* / Q000737:chemistry; D012044:Regression Analysis; D012722:Sewage / Q000737:chemistry; D018505:Waste Management / Q000379:methods; D062065:Wastewater / Q000737:chemistry*
chemical_list: D019855:Ethylene Glycol; D009584:Nitrogen; D010758:Phosphorus; D012722:Sewage; D062065:Wastewater
keywords: Energy recovery; Hydrogen and methane; Mono-ethylene glycol; Nitrogen-to-phosphorus balance; Regression model