PROGRESS IN SANITARY-LANDFILL TECHNOLOGY AND REGULATIONS IN JAPAN - AREVIEW

The Japanese guideline for municipal solid waste (MSW) landfill was re vised for the first time in nearly 10 years. This permitted the introd uction of various changes in the philosophy associated with municipal solid waste (MSW) management. The focal points of the revision were a review of the criteria for site design and operation prescribed in the old version, and supplemented with details of new technologies and ex periences in sanitary landfill accumulated in the past decade. However , there still remain several ambiguous issues to be resolved. These in clude geotechnical parameters of fill materials, stability analysis of embankment and fill materials, selection criteria for lining material s, quality assurance and quality control of liner installation, predic tion of quality and quantity of leachate, appropriate design of leacha te lagoons, and monitoring and treatment of groundwater contamination near to waste landfill sites. Of particular concern is a development o f cost-effective land disposal technology for MSW incinerator ashes an d flue gas cleaning residues.