Regional shipping strategy assessment based on installing a refuse-derived-fuel process in a municipal incinerator.

Abstract

The rising prices of raw materials and the concerns of energy recovery have resulted in an increasing interest in processing the waste streams. In recent years, a number of credible surveys have shown that recycling and waste-to-energy processes appear to work well together. Compatibility exists for several reasons related to economic, environmental, political, and social aspects. However, the regional impacts of installing a centralised refused-derived fuel (RDF) process prior to waste-to-energy facilities remain unclear due to the inherent complexity of solid waste composition, generation rate, energy and material recovery goals, and the existing shipping patterns. This paper illustrates a thorough evaluation for a RDF pilot study from both quantitative and qualitative aspects. Such a process, consisting of the standard unit operations of shredding, magnetic separation, trommel screening, and air classification, might be useful for integrating the recycling and presorting efforts with a large-scale municipal incinerator in a region. A series of sampling and analyses of the waste streams were performed in Taipei County, Taiwan in order to characterise its potentials for recycling. Based on the proper estimation of solid waste generation, the goal programming modelling analysis not only focuses on an evaluation of how the waste inflows with different rates of generation, physical and chemical compositions, and heating values in the service areas can be processed by a centralised RDF facility to meet both the energy recovery and throughput requirements in different municipal incinerators but also indicates the optimal shipping pattern associated with several incinerators due to such an installation in a regional sense. A case study designed to explore the regional impacts on shipping patterns in the southwestern of Taipei County, Taiwan verifies the application potential of such a planning methodology.