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Show AIR POLLUTION CONTROL FOR WASTE-TO-ENERGY PLANTS M. YAHAGISIII, T. YOKOYAMA E.SHIBUYA NIPPON KOKAN WASTE TREATMENT PLANT TECHNICAL SERVICES DEPT. 1. HOx emission standard and the technology in Japan 1-1) Emission standard for NOx The emission standard (corrected to 12% 02, hereinafter to be treated the same) by the government of Japan on NOx discharge from Waste-toEnergy Plants is as shown below: Applicable areas Control method E~ission standard Tokyo Metropolitan Immutable Weight Control New Plant Government ... Approx. 80 ppm Special wards and Existing Plant 5 cities ... Approx. 110 ppm Kanagawa Prefecture Hew Plant Yokohama City, ... Approx. 90 ppm Kawasak i City, Exi s ting Plant Yokosuka City, .. . Approx . 130 ppm Osaka Prefecture New Plant Osaka City and . .. Approx. 145 ppm ]6 cities and Exi s lin~ Pl ant 1 province ... !lpprox . 175 ppm Other than above Discharge Control 250 ppm However, cities adjacent to the area subject to control by immutable weight and other major cities have established a more stringent standard. For example, Kawasaki City ........... 800 g/refuse, ton (Approx. 70 ppm) Nagoya City ............. 70 ppm Hi rosh i ma City .......... 100 ppm Sendai City ............. 125 ppm there are also many other cities which have established values less than 150 ppm by more stringent standards. 1 |