Why is organic wastewater by anaerobic slow, but this phenomenon accelerates when called recirculation of waste water into the sewage system (e.g. biobed)?
Hi Mustapha
In anaerobic condition, the rate of bacteria metabolism is slow and they need to more time for utilization of organic matter as a sole carbon and energy source than others. Thus, when waste water is recirculated in system, this bacteria have enough time for bio degradation and mineralization of organic compounds, even in high organic loading rates of recalcitrant compounds. Of course, this stage (re-circulation of wastewater) may be needed only for acclimation phase of biomass to specific organic compound and then system can be operated continuous mode with appropriate of hydraulic retention time (HRT).
Article Anaerobic Biodegradation of High Strength 2-Chlorophenol-Con...
Ten years old, but the general principles are still valid:
Mogensen AS, Dolfing J, Haagensen F, Ahring BK. 2003. Potential for anaerobic conversion of xenobiotics. Adv Biochem Eng Biotechnol. 82: 69-134.
Abstract
This review covers the latest research on the anaerobic biodegradation of aromatic xenobiotic compounds, with emphasis on surfactants, polycyclic aromatic hydrocarbons, phthalate esters, polychlorinated biphenyls, halogenated phenols, and pesticides. The versatility of anaerobic reactor systems regarding the treatment of xenobiotics is shown with the focus on the UASB reactor, but the applicability of other reactor designs for treatment of hazardous waste is also included. Bioaugmentation has proved to be a viable technique to enhance a specific activity in anaerobic reactors and recent research on reactor and in situ bioaugmentation is reported.
https://www.researchgate.net/profile/Frank_Haagensen/publications/
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