Effects of treatment on leaching behaviour of mixed waste material from Semakau Landfill

• Main Author: Lim, Romy Boon Jing
• Other Authors: Fei Xunchang
• Format: Final Year Project
• Language: English
• Published: Nanyang Technological University 2023
• Subjects: Engineering::Environmental engineering
• Online Access: https://hdl.handle.net/10356/167217
• Institution: Nanyang Technological University

Given the current rate at which waste is being generated, it is anticipated that Semakau Landfill, which is Singapore's sole landfill, will reach its capacity and be completely filled by the year 2035. Consequently, government agencies like NEA have been working alongside companies and researchers to explore resource recovery methods for specific ash types like IBA and IFA. However, since the current studies are excessively focused on these individual ashes, further research is required to investigate Mixed Waste Material (MM) found at Semakau Landfill. Therefore, the objectives of this project involve evaluating the leaching properties of MM both before and after undergoing treatment, as well as examining the most effective water-washing conditions for MM samples. This will be achieved by manipulating two key variables: the L/S ratio and washing duration. In particular, a sequence of batch leaching tests will be carried out to measure the concentration of heavy metals and soluble salts that are leached from MM. These tests will be conducted following two consecutive treatments: Initially, the process of metal recovery will be performed, followed by a subsequent treatment involving water washing.