Anaerobic treatment of cheese whey in a two‐phase uasb reactor

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Abstract
The whey produced by the cheese industries can be anaerobically treated. The main operational limitations for single phase reactors are instability and the necessity of adding alkalinity. A double phase reactor has been used and a new operational strategy is proposed. The recirculation of the eflluent of the metanization reactor produces a dilution of the influent that allows a good stability of the system without the necessity of adding alkalinity. COD removal higher than 99% can be obtained operating with Bv = 30 Kg m‐3 d‐1 in the acidification reactor (t=0.45 d) and Bv= 15 Kg m‐3 d‐1 in the metanization reactor (t =0.75 d).

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