This paper presents a summary of the ideas expounded in the presentations and the resulting discussions at the workshop held in Valladolid, Spain (24-26 September 1990). The formal presentations and discussions are included in the articles which comprise the rest of this issue. The main topics summarized are the characteristics of the anaerobic process, its technological implications relating to different reactor concepts and to different designs, the importance of correct waste characterization for appropriate treatment, the characterization of the biomass, and the influence of all these factors on the design and operation of anaerobic treatment systems. Sections outlining the research and development needs for the enhancement of this technology are also included.
Different series of experimental runs were performed in order to study the interaction of support/microorganisms (stimulatory or inhibitory effects) and the colonisation capability of five different supports. PUR foam followed by plastic PVC rings were the media with better colonisation characteristics. One of the mineral materials tested, namely clay, was found to be a serious inhibitor of biofilm formation.
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