Adsorption studies of COD and Fe2+ from stabilized landfill leachate on activated carbon and calcite containing alginate

• Main Authors: Isa, Awatif Md, Yusoff, Mohd Suffian, Kamaruddin, Mohamad Anuar, Aziz, Hamidi Abdul
• Format: Conference Proceeding
• Language: English
• Subjects: Activated carbon; Adsorbents; Adsorption; Alginates; Calcite; Chemisorption; Landfill; Landfills; Leachates; Mixing ratio; Organic chemistry
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/1.5005695

In this study, composite adsorbent was produced from the combination of activated carbon (AC) and calcite by four (4) different mixing ratios (AC:Calcite) of 9:1, 7:3, 1:1, 3:7, 1:9. The mixture was mixed with alginate as the binder. The composite adsorbent was tested in batch of experimental study to observe the effectiveness of removing COD and Fe2+ from sample of leachate collected from semi-aerobic sanitary landfill at Pulau Burung, Penang, Malaysia. The effect on contact time was conducted to observe its impact on the adsorption of COD and Fe2+. Besides, the adsorption kinetic model was also conducted to study the mechanism of adsorption process by applying pseudo-first order and pseudo-second-order rate equations. Based on experimental results, optimum removal of COD and Fe2+ was obtained at mixing ratio of 7:3 with optimum removal of 54.6% for COD and 68.06% for Fe2+. This result indicates that high amount of AC in mixing ratio of adsorbent contributed to the highest removal of both COD and Fe2+. In addition, the study also proves that a combination of AC and calcite has improved the adsorption efficiency. The results of adsorption kinetic model indicate that both COD and Fe2+ followed the pseudo-second order kinetic model which means that the chemisorptions is the favorable mechanism of adsorption process.