Combining mixing regimes for optimized anaerobic wastewater treatment |
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Authors: | Kleerebezem Robbert |
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Institution: | (1) Kluyver Laboratory of Biotechnology, Delft University of Technology, Julianalaan 67, 2628 BC Delft, The Netherlands |
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Abstract: | Operational practice of high-rate anaerobic bioreactors such as upflow anaerobic sludge bed (UASB) reactors is generally based
on maximization of the biomass concentration and, in the case of more than one reactor compartment, operation in parallel.
In this article, a modeling approach is used to postulate that the treatment performance of anaerobic bioreactors can be improved
by simple operational measures. To achieve minimized effluent soluble substrate concentrations, operation of two reactors
in series combined with active exchange of biomass between both reactors is suggested. In this way, substrate concentrations
lower than the minimum achievable concentration in a completely mixed reactor can be achieved. It is furthermore suggested
that maximized biomass concentrations (and solid retention times SRTs]) do not necessarily lead to minimized effluent concentrations
of organic material. At elevated SRTs, the soluble microbial products resulting from biomass turnover are shown to represent
the main fraction of soluble organic material in the effluent of the reactor, limiting treatment efficiency. |
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Keywords: | Anaerobic wastewater treatment operation optimization soluble microbial products staged reactor concepts upflow anaerobic sludge bed reactor |
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