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熱分解에 依한 可懶性廢棄物의 處理및 資源回收에 關한 硏究
金三權(Sam Cwan Kim),鄭文植(Moon Shik Zong) 한국환경보건학회 1987 한국환경보건학회지 Vol.13 No.1
As a result of technical advances and industrialization, the characteristics of domestic and industrial wastes are becoming more complex. Accordingly, improved treatment and disposal systems are being continuously sought to take account of complex characteristics and to comply with economic restrictions. In this study, an application of pyrolysis to the treatment of industrial wastes, inc1uding waste scrap rubber, waste raw material used in making the slipper bottom and waste PVC pipe, and the effectivoeness of pyrolysis in resource recovery from these wastes were investigated. Batches of wastes were pyrolysed by external heating to a tempcrature of 400-800oC in a 32 mm diameter x 0.9 m long silica tube to produce combustible gases, oils and chars. Before the start of pyrolysis runs, the entire system was purged with nitrogen gas to exc1ude the air. The temperature inside the retort was controlled by the thermocouple in the gas stream, and referred to as the pyrolysis temperature. Under these conditions three products were separately collected and further analyzed. The results were summarized as follows. 1. More gases and less chars were produccd with highcr pyrolyzing tcmpcraturc and with higher rates of heating, but the yields of oils tended downwards at tcmpcratures abovc 7000 C. Accordingly, operating conditions of pyrolysis should be varied with desired material. 2. Calorific values and sulfur contcnts of produced oiJs were sufficicnt anc1 suitablc for fuel use. Chars from waste rubber had high heating values with low sulfur contents, but calorific values of chars from waste PVC and waste slipper were as low as 3,065-4,273 kcalfkg and 942-2 ,545 kcalfkg, respectively. Therefore, char from these wastes are inappropriate for fuel. 3. Soluble contents of Pb, Cd , C11 and Zn in chars from waste rubber and waste slipper were below the Specific Hazardous Waste Treatment Standards. However soluble contents of pb alld Cd in chars from waste PVC were one or two times and five or seven times exceedingly the Specific Hazardous Waste Treatment Standards, respectively. 4. Post high heating is desirab le for treatment method of waste PVC which generates toxic hydrogen chloride. 5. The proportions of hydrogen, methalle and ethane in produced gases were in the range of 3.99-35.61% VjV, 18 .22-32.50% VfVand 5.1 7-5.87% VjV, respectively. 6. Pyrolysis is a useful disposal method in case of waste slipper, which was hardly combustible, and thus investigations of this kind of materials are required for effective management of industrial waste. 7. Based upon the possible market development for products, overall pyrol) 、economics to take account of treatment values of noncombustible or hazardous materials should be evaluated.