Life cycle assessment of construction and demolition waste management based on waste generation projections of residential buildings in Metro Manila, the Philippines
Laurenze John G. Estrada, Jun Nakatani, Toru Hayashi, Tsuyoshi Fujita
Abstract
The environmental impact of the existing and improved management systems of the estimated current and future generation of construction and demolition waste (CDW) in Metro Manila, the Philippines, was evaluated in terms of global warming potential (GWP) and urban land occupation (ULOP). CDW generation quantities were estimated using dynamic material flow analysis, and the environmental impacts of different CDW management systems were evaluated based on life cycle assessment using the ReCiPe midpoint method. The results showed that the recycling and reuse of CDW, especially steel, contributes to reducing the environmental impact of recycling systems; however, landfilling is still a better option unless the demand for recovered CDW increases. This study highlights the need for maximizing the use of secondary materials recovered from CDW; accordingly, the introduction of specialized sorting to the waste chain should show promise in reducing both the GWP and ULOP of CDW management.