Laboratory characterization of mixed waste materials from Semakau Landfill

Abstract

This study investigates the potential of biopolymers as sustainable stabilizing agents for mixed waste materials (MM) in Singapore's construction industry. Amidst growing concerns over the rapid pace of waste accumulation and the projected saturation of Semakau Landfill by 2035, this research aims to compare the efficacy of these binders, namely kappa gum (KG), xanthan gum (XG), agar gum (AG), guar gum (GG), and sodium alginate (SA). The study specifically examines the Atterberg’s Limit(AL) of them and how it might correlate to their unconfined compressive strength (UCS) and ductility of treated mixed waste samples.

The findings indicate that biopolymers can outperform traditional binders in improving AL of MM. This underscores its potential as a viable, sustainable option for construction practices that require robust and resilient materials. The research delves into the biopolymer's impact on MM properties, particularly the Atterberg limits, compressibility, permeability, and strength. These insights contribute to a deeper understanding of how biopolymers can transform waste materials into functional construction resources.

In addition to highlighting the immediate benefits of biopolymer use, this study lays the groundwork for future research directions. It calls for further investigation into optimizing biopolymer concentrations for different MM types, evaluating the long-term performance of biopolymer-stabilized materials, and conducting comprehensive economic and environmental impact assessments. Such research is pivotal for developing guidelines and practices that align with Singapore's commitment to sustainable urban development and environmental stewardship.

This work not only provides a scientific basis for the use of biopolymers in waste stabilization but also aligns with global sustainability goals, offering a pathway toward more sustainable, resilient, and cost-effective construction practices, particularly in urban environments like Singapore.