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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.
Highlights
In past decades, anaerobic bioreactors have been utilized to recover value-added chemicals and bioenergy from different waste materials (Khan et al, 2016a; Wang et al, 2018)
NO3- removal performance was maximum at the longest hydraulic retention time (HRT) (48 hrs) referring to the condition where the microorganisms were allowed enough time to undertake the denitrification process
The reason may be associated with the fact that the contact time between the feed wastewater and the denitrifying bacteria was lowered and shorter HRTs
Summary
Anaerobic bioreactors have been utilized to recover value-added chemicals and bioenergy from different waste materials (Khan et al, 2016a; Wang et al, 2018). Industrial application for anaerobic membrane bioreactors has been limited because the product revenue earned from this process is not constant This is because of the variable production rate of VFA, biohydrogen, and methane due to the frequent change of carbon content in feed wastewater (Khan et al, 2016b; Pretel et al, 2016). In addition to this discussion, recovering VFA and biohydrogen, where biogas production can improve revenues earned from anaerobic processes and eventually improve the economic feasibility of largescale production. For treating municipal wastewater, the influent COD typically varies from 150 to 350 g/L, it can be concentrated further for resource recovery purposes (Ji et al, 2014; Zheng et al, 2018)
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