AN ASSESSMENT FOR ENERGY POTENTIAL OF SOLID WASTE FROM SHIP SCRAPING YARD AT ALANG - SOSIYA, INDIA

摘要

Alang - Sosiya (Lat 21°5′; 21° 29′ N, Long 72°5′; 72°15′E) is the largest ship-scraping yard in the world, established in 1982. This yard has gained world prominence on account of certain topographical advantages like, high tidal range (～ 13m), gentle sloping and firm bottom etc. Every year an average of 365 ships having a mean weight of 2.10 x 10~6 +- 7.82 x 10~5 LDT (light dead weight tonnage) are scrapped. This yard generates a huge amount of combustible solid waste in the form of scrapped wood, plastic, insulation material, paper, hard wood, glass wool, thermocol pieces, sponge, oiled rope, cotton waste, rubber, etc. Hence the present study has been designed to assess the energy potential of the solid waste generated from the ship-scraping yard. Thirty different types of solid waste materials have been collected for a period of six months (May to October, 2002) covering an area of 2.52 sq. km. Their proximate and ultimate analyses were carried out by standard ASTM & IS methods and the energy content was calculated by DuLong's equation. The average energy content calculated as collected, dry, moisture and ash free basis were 23781.03 KJ/kg, 25645.9 KJ/kg, and 28475.98 KJ/kg respectively. The average gross heating value (HHV) was 24160.34 KJ/kg. The results of this study revealed that the solid waste of the ship-scraping yard could yield energy of 90 million KJ/hr, in the form of steam energy 63 million KJ/hr and electric power 5.28 MW. The estimation of energy potential has been calculated considering the probable losses in process of energy generation.