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Municipal solid waste in Mostaganem city (Western Algeria).
Waste Management 2009 Februrary
The management of municipal solid waste (MSW) and valorisation is based on the understanding of MSW composition by its categories and physicochemical characteristics. In this study, we characterize and determine physicochemical parameters (density, fire loss, electric conductivity, average pH, moisture level, lower calorific value (LCV), total and organic carbon, and nitrogen) in order to establish MSW valorisation models for Mostaganem city (located in Western Algeria). The results show that organic matter represents 64.6% of waste, followed by paper-cardboard 15.9%, plastic 10.5%, glass 2.8%, textile 2.3%, metals 1.9%, and diverse materials 2%. These statistics are similar to results from developing countries, especially if organic matter, paper and plastic are taken into account, but differ from developed countries. This reflects the difference in lifestyle and consumption behaviour between the two communities. The parameters used to determine the possible valorisation model had the following average values: fire loss (63%); ash (37%); pH (6.1); electric conductivity (2.39 ms cm(-1)); total carbon (29.5%); nitrogen (1.5%); LCV (1028.6 kcal/kg), density (0.36), C/N (19.7) and moisture level (58.9%). The study shows that 31.1% of paper-cardboard, plastic, glass and metal wastes are recyclable. Incinerating MSW, with energy recovery, was a poor option because of the weak LCV (1028.6 kcal/kg). However, MSW produced a good methane yield of up to 1852.4 equivalent tons of oil per year. The agricultural benefits, C/N ratio values, levels of moisture and pH and the Tanner diagram all supported compost production.
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