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Optimization of hydraulic retention time and organic loading rate for volatile fatty acid production from low strength wastewater in an anaerobic membrane bioreactor

Author:
Khan, Mohd Atiqueuzzaman, Ngo, Huu Hao, Guo, Wenshan, Liu, Yiwen, Nghiem, Long Duc, Chang, Soon Woong, Nguyen, Dinh Duc, Zhang, Shicheng, Luo, Gang, Jia, Hui
Source:
Bioresource technology 2019 v.271 pp. 100-108
ISSN:
0960-8524
Subject:
carbon, fermentation, glucose, isobutyric acid, membrane bioreactors, methanogens, pH, propionic acid, volatile fatty acids, wastewater
Abstract:
This study aims to investigate the production of volatile fatty acids (VFAs) from low strength wastewater at various hydraulic retention time (HRT) and organic loading rate (OLR) in a continuous anaerobic membrane bioreactor (AnMBR) using glucose as carbon source. This experiment was performed without any selective inhibition of methanogens and the reactor pH was maintained at 7.0 ± 0.1. 48, 24, 18, 12, 8 and 6 h-HRTs were applied and the highest VFA concentration was recorded at 8 h with an overall VFA yield of 48.20 ± 1.21 mg VFA/100 mg CODfeed. Three different ORLs were applied (350, 550 and 715 mg CODfeed) at the optimum 8 h-HRT. The acetic and propanoic acid concentration maximums were (1.1845 ± 0.0165 and 0.5160 ± 0.0141 mili-mole/l respectively) at 550 mg CODfeed. The isobutyric acid concentration was highest (0.3580 ± 0.0407 mili-mole/l) at 715 mg CODfeed indicating butyric-type fermentation at higher organic loading rate.