The Anaflux process, an upflow anaerobic fluidized bed reactor using a mineral bacterial support, has been employed industrially for ten years treating a variety of food-processing and paper industry wastewaters. This paper describes five aspects of the design and operation of the anaerobic fluidized bed which have proven, from industrial experience, to be essential. The optimization of these factors enables a stable functioning of the process and allows the application of high loading rates. Included are the results of a semi-industrial pilot study, treating wine distillation wastewaters, which demonstrate the present capabilities (OLR=70 kg COD/m3·d) of this type of reactor.

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