Economic analysis of solid waste gravimetric composition in a City of 60,000 inhabitants in Brazil
Análise económica da composição gravimétrica dos resíduos sólidos numa Cidade de 60.000 habitantes no Brasil
Keywords:municipal solid waste, gravimetric composition, public waste management
This study aimed to analyze the gravimetric composition of solid waste in a city of 60,000 inhabitants, and the economics aspects related to the gravimetric composition. The research was performed through the characterization of waste bags from three types of waste collections in the city: urban (USW), rural (RSW) and selective (SSW). First, waste were divided into twelve categories and, later, in three: organic matter; recyclable; and rejects. The percentage of recyclable waste reached in USW (51,7%) and organics waste reached on the SSW (10,5%) indicated the need of educational and information campaigns to divulgate the days of selective waste collection and how to separate waste. The percentage of organics waste on the RSW (20,1%) indicated the need of projects and campaigns of how to elaborate house composting. It was found that the municipality of this study spends R$ 2,791,901.57 by year with all operations related to municipal waste management. If 50% of all organic matter found in three collections types was used in house composting and if 50% of all recyclables found in USW and RSW collections were send to a sorting center, it would be possible to save R$ 288,628.88 by year in municipal waste management, which could be used in environmental awareness programs. So, the correct solid waste management could bring environmental and economic profits to the city, such as the reduction of waste disposed in landfill and consequently its costs of disposal.