Study On The Classification And Reduction Of Municipal Solid Wastes In Shanghai

The burgeoning economy, high population density and accelerated urbanization process of Shanghai Metropolis have fairly increased the capita municipal wastes transferring quantity. According to the report issued by 2013, Shanghai Metropolis generally processed 20,000 tons wastes per day, which is equivalent to a ratio of per capita of 0.83 kg/day. Issues regarding "Wastes Siege" therefore have been threats to the health and living environment of civilians. The relevant authorities in Shanghai have been years implementing wastes classification, but the post-processes including wastes transfer, final disposal, system assessment and legislation do not streamline the whole treatment system; and these all have resulted in the underperformance of wastes classification systemThis study analyzed the status quo of wastes classification in Shanghai from the perspective of municipal wastes collection, transfer and treatment in depth, and further discerned the bottleneck problems. Some mathematic models were constructed to predict the wastes generation amount of Shanghai in 15 years. The main modeling results are:(i) based on the logistics balance model, the total amount of wastes transfer amount will be around 8.176 million tons by the year of 2020; (ii) based on the multiple regression, the total wastes transferring quantity will be amount to 8.691 million tons; and this number will be 9.29 million tons according to GM(1,1) model.The predicted results suggest that minimizing the municipal wastes amount necessitate approaches concerning wastes classification and reduction in the community-scale. Here the demonstrational exploiting newly developed wastes processing technologies were constructed to assess their performance metrics with respects to economic sustainability and technical feasibility. The obtained results show that this technologies can reduce 67.4% wastes generated from target residential areas and meanwhile the following wastes collection costs only 70% of the unpretreated ones; and this value could additionally drop by 70%, if the recycling benefits were considered. Therefore, this system technically provides a new scheme for on-site wastes classification and thereby lessens the loads for the medium and post treatment in the wastes processing chain.Overall, this study based on the predicted wastes generation amounts analyzed the current situation of wastes classification in Shanghai and other developed economics; and further proposed comprehensive strategies including wastes reduction, transfer, treatment and regulation that could benefit the implementing wastes classification of wastes from sources and wastes reduction in Shanghai.