報告書番号

V04019

タイトル（和文）

石膏ボード廃棄物のリサイクルに関する現状調査・分析 -－脱硫石膏需要に及ぼす今後の影響推定－-

タイトル（英文）

Study and analysis of the actual state of gypsum board waste recycling -Estimation of impacts on the demand for desulfurization gypsum-

概要 （図表や脚注は「報告書全文」に掲載しております）

石膏ボードリサイクルに関する現状調査・分析を行った。その結果，今後規制強化に伴い石膏ボードのリサイクル量が急増する可能性があること，リサイクル量推進に伴う電気事業の脱硫石膏の将来の需要減少は年間約20～30万ｔに達すると見られること，脱硫石膏に残された最大の需要枠は石膏ボードメーカーの輸入する天然石膏の代替用途であることが明らかとなり，今後は脱硫石膏に関して更なる性状改善が必要となることが示された。

概要 （英文）

The amount of the desulfurization flue gas (DFG) gypsum from Japanese electric utilities is about 1.6 Mt in 2003, and the volume is the second largest within by-products of coal power plants. At present, all of the DFG gypsum is used as a raw material of gypsum board and cement additives. On the other side, for the reasons of occurrence of environmental problems in the gypsum-board disposal-sites, construction and demolition (C&D) waste recycles are progressed by administrators. The recycle uses of gypsum board are almost competitive with DFG gypsum uses and consequently the 100% recycle of DFG gypsum will be more difficult. In this study, the states of gypsum board recycle at home and abroad are reviewed, and the effects on the demands of DFG gypsum of Japanese electric utilities are estimated.Principal results are as follows:1. The amount of gypsum board waste (GBW) is now increasing and that will be 1.76Mt/yr within 2010. The main recycle use of GBW are a raw material of gypsum board and cement additives. Japanese authority estimates the potential capacity of the demands for recycle uses of the GBW at 2.1Mt/yr.2. Both in Japan and US, many incidents of H2S gas generation from disposal landfill sites of GBW have been reported from 1990's. Many states in US tend to legislate ban of gypsum disposal from landfills. Pursuant to the Japanese regulation, GBW disposed at inert type sanitary landfill sites must meet the limit value of the ignition loss under 5% of weight. This regulation is not sufficient to prevent the H2S gas generation. In EU, more rigid regulation has been in force from 2002. Hence, the regulation of Japan might be reinforced in the years ahead, and these actions will enlarge the supply of the GBW as raw materials.3. From the target index of GBW utilization until 2010 by board industry, and from the amount of by-product gypsum used by cement industry, the decrease in demand of DFG gypsum from electric utilities is estimated at about 0.2 ～0.3 Mt/yr. The greatest remained demand for the DFG gypsum is a alternative use of natural gypsum for board production. The developments of the technologies for the improvement of the characteristics of DFG gypsum are necessary for enlarge of the use.

報告者

キーワード