This paper is a study of the Selective Waste Collection System at the city of Sao Paulo, Brazil. Sao Paulo is the largest city in Latin America and one of the world´s largest, with a population of over 11 million people. However, although being an economic reference and having the largest industrial park and financial center of the country, selective waste collection and recycling reaches only 46% of households, that represent only about 2.6% of the waste collected in the city, and yet even this is very mixed with waste. Disposal of solid waste causes significant environmental impact, and its known that poor solid waste city management have major impact on health and on the local and global environment due to the physical pollution of soil, water and polluting emissions generated by the release of harmful gases; moreover there is an addition to the significant increased economic costs in handling such waste that were not treated properly from the beginning. The lack of Waste Management has a great impact regarding the pollution of soil and air factors, becoming one of the main causes of flooding due to lack of collection and inadequate disposal in soils and waters. This paper is a study of Solid Waste Management at the city of Sao Paulo, following regional and national objectives. By checking all the logistics of the process, it was possible to identify steps and actors that contribute to 2.6% of recycled materials in the city, of possible 35%. Finally five players of the system from different areas were interviewed that describe challenges and opportunities of the selective collection system that may end up bringing benefits to the city.
Influencing factors of Solid Waste Management global cost and efficiency: a multi-objective optimization focusing on the collection system
