04 July 2011

Modeling the energy content of combustible ship-scrapping waste at Alang–Sosiya, India, using multiple regression analysis:


Alang–Sosiya is the largest ship-scrapping yard in the world, established in 1982. Every year an average of 171 ships having a mean weight of 2.10 × 106( ± 7.82 × 105) of light dead weight tonnage (LDT) being scrapped. Apart from scrapped metals, this yard generates a massive amount of combustible solid waste in the form of waste wood, plastic, insulation material, paper, glass wool, thermocol pieces (polyurethane foam material), sponge, oiled rope, cotton waste, rubber, etc. In this study multiple regression analysis was used to develop predictive models for energy content of combustible ship-scrapping solid wastes. The scope of work comprised qualitative and quantitative estimation of solid waste samples and performing a sequential selection procedure for isolating variables. Three regression models were developed to correlate the energy content (net calorific values (LHV)) with variables derived from material composition, proximate and ultimate analyses. The performance of these models for this particular waste complies well with the equations developed by other researchers (Dulong, Steuer, Scheurer-Kestner and Bento’s) for estimating energy content of municipal solid waste.

Article Outline:

1. Introduction
2. Materials and methods
2.1. Moisture content (ASTM E949)
2.2. Volatile matter and ash content (ASTM E897)
2.3. Physical composition (ASTM E889)
2.4. Multiple regression analysis
2.5. Regression diagnostics
3. Results and discussion
3.1. Characteristics of ship scrapping waste from Alang–Sosiya ship breaking yard
3.2. Physical composition model
3.3. Ultimate analysis model
3.4. Proximate analysis model
4. Conclusions

Journal Title: Waste Management
Volume 25, Issue 7, 2005, Pages 747-754
Accepted 9 November 2004.  Available online 10 February 2005.

M. Srinivasa Reddy, Shaik Basha, H.V. Joshi, V.G. Sravan Kumar, B. Jha and P.K. Ghosh

Author Affiliation:
Department of Marine Algae and Marine Environment, Central Salt and Marine Chemicals Research Institute, Gijubhai Badheka Marg, Bhavnagar 364 002, Gujarat, India

Corresponding Author: Tel.: +91 278 2561354
Fax: +91 278 2566970/2567562.

Source: Science Direct

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