MECHANICAL BIOLOGICAL TREATMENT OF RESIDUAL WASTES, ADEQUATE LANDFILLING TECHNIQUES AND REHABILITATION OF OLD LANDFILL DEPOSITS

Research work of the last years has been committed to developing residual waste treatment technologies and the corresponding landfilling techniques. Among the research results the mechanical biological residual waste treatment in combination with its newly developed landfilling practice have proven to be cost-efficient and environmentally safe solutions. Characteristics of the new technology are: • reduction of waste volume to be deposited by means of decomposition of biologically degradable components; • separation of valuables and recyclables out of the waste stream results in 30-50 % mass reduction; • stabilization of the waste to be safely deposited, thus decrease of the landfill settling process and reduction of malodor emissions; • reduction of the gas formation potential by 80 to 90 %; • reduction of leachate volume and its contaminant loading through biodegradation of organic matter, contaminants are fixed and immobilized within the stabilized waste; • options for highly compressed installation of stabilized waste into the landfill, installation densities increased from 0.7 t/m3 to 1.4 t/m3; • reduction of hydraulic conductivity to < 10-7 to 10-8 m/s; • landfill space required can be reduced by> 70 %