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论文类型： 期刊论文

发表时间： 2013-04-01

发表刊物： CHEMICAL ENGINEERING JOURNAL

收录刊物： SCIE、EI

卷号： 221

页面范围： 37-43

ISSN号： 1385-8947

关键字： Domestic sewage; Anaerobic acidogenesis; Multiple factors; Volatile fatty acids; Biofilm reactor

摘要： Anaerobic acidogenesis in an up-flow non-woven biofilm reactor was investigated to convert chemical oxygen demand (COD) into volatile fatty acids (VFAs) as carbon source in the subsequent nitrogen removal process in synthetic domestic sewage pretreatment. A specifically designed non-woven padding inserted vertically into the reactor proved very favorable for acidogenic bacterial attachment. The characterization of the microorganisms was performed using scanning electron microscopy and fluorescent in situ hybridization. Multiple factors, including hydraulic retention time (HRT), pH, and influent COD and NH4+-N concentrations, played comprehensive roles in acidogenesis. Based on the Taguchi orthogonal array, the ordering sequence of the influential factors for VFAs production was influent NH4+-N (R = 41.4) > pH (R = 37.3) > influent COD (R = 20.2) > HRT (R = 14.8). The suitable conditions were HRT = 1.5 h, pH = 8.5, influent COD = 100 mg L-1, and influent NH4+-N = 30 mg L-1. Moreover, acetic acid, propionic acid, and n-butyric acid prevailed over other VFAs. Finally, the most influential factor for each VFA was demonstrated. (C) 2013 Elsevier B.V. All rights reserved.