Masataka Hanajima

(Research Committee for the Development of Facility for Waste Treatment & Disposal,Chairman, Professor of Fukuoka University)

Abstract

In order to resolve the recent lack of proper solutions for waste disposal, studies conducted on disposal sites culminated in a decision to proceed with more in-depth studies of various types of closed-system disposal sites. The studies on the closed systems are presented in this paper. The closed-system sites may be covered by arch, dome or flat roof. This prevents the entry of external rain water and therefore eliminates the need of leachate treatment equipment. This also prevents the free diffusion of produced gases, foul odors, etc. Depending upon the structural design of the disposal site covers, it becomes feasible to use the area above the cover for any other purpose deemed suitable while the lower portion is used as the disposal area. However, to evolve a mature engineering methodology along the lines of a closed system, there still remain many problems to be resolved concerning not only the structure of the disposal site but also procedures covering enviromental control, transportation, landfill methods and procedures to ensure the stabilization of waste. Further studies to integrate engineering knowhow to attain an improved concept are planned.

Key words: waste, disposal site, closed system, artificial ground, utilization of land reclaimed with waste