In this experimental study the treatment efficiency on a milk based synthetic organic waste is examined of a fixed bed reactor with immobilized cells in organic support (straw). The aim of this research effort was to demonstrate an anaerobic treatment system which is flexible enough and can be used widely at small agroindustrial units as a low-energy-demanding treatment system. It can also be possibly used for the stabilization of the organic support, which can consequently be incorporated for the faster evolution of the composting phenomenon. A significant number of concentrations at the entrance of the fixed bed reactor, with a volume of V = 10.7 1, constructed from plexiglass and downflow fed, has been applied at different hydraulic retention times and at different temperatures (35°, 25°, 15°C). The examined reactor operates in plug-flow mode and the conclusions that were drawn from the experiments, with the above anaerobic treatment system are as follow. The treatment system can treat high and low strength effluents with considerable treatment efficiency. It can treat low strength effluents, with sufficient treatment efficiency, at medium and low temperatures, for anaerobic digestion standards. The time for adaption between different applied loadings at the inlet is quite short, which indicates the considerable flexibility and utility of the system.

In the departments of Attika and Viotia there are about 1,100 industries. The total amount of produced waste from the above mentioned branches is 20 × 106 t/year, 600,000t of which contain toxic substances. By contract from October 1st, 1992 between the Ministry of the Environment, Regional Planning and Public Works and three collaborating offices (among them the office of C. Malliaros) has been assigned to the latter, the realisation of a study of the management of toxic waste (liquid) and sludges, in the Departments of Attika and Viotia. The study presented in this paper investigates the following: - collection and evaluation of data and estimation of the hydraulic and pollution loads - classification of industries according to sewage facilities - further possibilities for changes of improvements in the production process of the industrial branches for the reduction of pollution and representation of these industries on maps - proposals for the collection and transport of the liquid toxic waste and sludges - pre-treatment at the source and disposal of the liquid waste and sludges - presentation of administrative and legislative regulations - forming a policy for the management and monitoring of this waste - technical and financial evaluation and investigation of the alternative methods of treatment - suggestions for the development of the area concerning the activities and the expenses at various levels.

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