Order Received for Large Industrial Waste Disposal Plant
Artist's impression of the Kanagawa prefectural industrial waste disposal plant to be built by NKK
NKK has received a ¥8.56-billion full-turnkey order from Kanagawa Waste Disposal Foundation,Inc. to construct a large-scale plant for intermediate disposal of industrial wastes collected in Kanagawa Prefecture bordering Tokyo. The plant will be one of the largest industrial waste disposal facilities ever planned by a public organization in Japan. The project is also epochmaking in being supported by three local municipalities including the Kanagawa prefectural government and two government-designated cities, Yokohama and Kawasaki. The project resulted from the fact that in Kanagawa Prefecture, which generates some 22 million tons of industrial wastes per year, around 20% of the wastes, or about 4 million tons, are disposed of as land fill. To respond to the shortage of permanent disposal sites in the prefecture and comply with applicable regulations, the local municipalities jointly set up the Waste Disposal Foundation to promote this project as a model for future industrial waste disposal plants built by private operators. The plant will be constructed in the coastal industrial area of Kawasaki City on Tokyo Bay,with completion scheduled for the spring of 2001. The major facilities to be constructed by NKK include a 100 tons-per-day preprocessing plant (crusher: 85 tons/5 hours, sludge dehydrator:15m3/5 hours) and three incinerators with a combined daily capacity of 210 tons, comprising two sets of rotary kiln/post-combustion stoker furnaces (70 tons/24 hours each) for sludge and bulky wastes and a fluidized-bed furnace (70 tons/24 hours) for smaller wastes. As well, the plant will incorporate power generators utilizing waste-heat energy to generate 4,800 kilowatts with three furnaces operating simultaneously. The electricity will be used to run various facilities at the plant, with the surplus electricity to be sold to a power company. The plant will be capable of processing a variety of waste materials including plastics, organic sludge and specially controlled industrial wastes such as medical wastes and building material mixtures. The incinerators' high combustion temperature of over 900°C combined with activated carbon and thermal decomposition treatments effectively control the concentration of dioxin in flu gas to less than 0.l nanogram (1ng is one billionth of a gram), meeting the standard set by the Japanese Health and Welfare Ministry, and any remaining dioxin in fly ash is also extracted. As a model facility, the disposal plant will also be equipped with the most advanced environmental pollution control systems including an economizer,a temperature reducing reaction tower, a harmful gas removal system, a three-filter dust collector,a catalytic denitration system, and a dioxin decomposer. With these systems, the plant can reduce the amounts of dust in flu gas to less than 0.02g/m3, SOx to less than 30 ppm, HCl to less than 50 ppm,and NOx to less than 31 ppm. NKK has been playing a prominent role in supplying broad-coverage waste disposal and recycling facilities in Japan and abroad. The company already has received 12 orders for industrial waste disposal plants including in-house incinerators. As far as municipal waste disposal plants are concerned, NKK has been involved in more than100 projects. NKK intends to undertake the latest plant construction project by fully utilizing its abundant experience and technical know-how gained through the years. |
