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Efficiency of Emerging Low-Cost Adsorbent Materials in Removal of Colour from Stabilized Landfill Leachate
Municipal Solid Waste management is becoming an increasing and complex global threat. Leachate generated in landfills contains toxic contaminants that adversely affects the ecosystem if it is not properly treated before discharge. The present study investigates the efficiency of low-cost adsorbents; derivatives of sawdust (SD), rice husk (RH), and chitosan, while focusing on the removal of colour-causing contaminants from a permeate of an Anoxic/Oxic Membrane bioreactor system (A/O MBR) used for stabilized landfill leachate treatment. The results showed that biochar derived using SD (SDBC) and RH (RHBC) could be used as efficient adsorbents with colour removal efficiencies of 38.2% and 36.2% at optimum conditions which were found for pH, contact time, adsorbent dosage, and rotating speed as 2, 24 h, 10 g/l, and 200 rpm respectively. Unexpectedly, no significant enhancement was observed in colour removal after chemical modifications were done to biochars using H3PO4 and KOH, which were contradicting previous studies. However, composites made with biochars and chitosan showed increased removal efficiencies of 51.4% and 53.2% for Chitosan + SDBC and Chitosan + RHBC composites respectively, when the materials were chemically modified into a crosslinked protonated material with Glutaraldehyde (C5H8O2) and Hydrochloric acid (HCl). As an ongoing study, further recommendations are made to use different analytical techniques for characterization of the materials. Nonetheless, the results indicate that the use of low-cost adsorbents composited with biosorbents is much more effective in colour-causing contaminant removal from stabilized landfill leachate compared to the use of raw materials itself.
Efficiency of Emerging Low-Cost Adsorbent Materials in Removal of Colour from Stabilized Landfill Leachate
Municipal Solid Waste management is becoming an increasing and complex global threat. Leachate generated in landfills contains toxic contaminants that adversely affects the ecosystem if it is not properly treated before discharge. The present study investigates the efficiency of low-cost adsorbents; derivatives of sawdust (SD), rice husk (RH), and chitosan, while focusing on the removal of colour-causing contaminants from a permeate of an Anoxic/Oxic Membrane bioreactor system (A/O MBR) used for stabilized landfill leachate treatment. The results showed that biochar derived using SD (SDBC) and RH (RHBC) could be used as efficient adsorbents with colour removal efficiencies of 38.2% and 36.2% at optimum conditions which were found for pH, contact time, adsorbent dosage, and rotating speed as 2, 24 h, 10 g/l, and 200 rpm respectively. Unexpectedly, no significant enhancement was observed in colour removal after chemical modifications were done to biochars using H3PO4 and KOH, which were contradicting previous studies. However, composites made with biochars and chitosan showed increased removal efficiencies of 51.4% and 53.2% for Chitosan + SDBC and Chitosan + RHBC composites respectively, when the materials were chemically modified into a crosslinked protonated material with Glutaraldehyde (C5H8O2) and Hydrochloric acid (HCl). As an ongoing study, further recommendations are made to use different analytical techniques for characterization of the materials. Nonetheless, the results indicate that the use of low-cost adsorbents composited with biosorbents is much more effective in colour-causing contaminant removal from stabilized landfill leachate compared to the use of raw materials itself.
Efficiency of Emerging Low-Cost Adsorbent Materials in Removal of Colour from Stabilized Landfill Leachate
Lecture Notes in Civil Engineering
Dissanayake, Ranjith (editor) / Mendis, Priyan (editor) / Weerasekera, Kolita (editor) / De Silva, Sudhira (editor) / Fernando, Shiromal (editor) / Konthesingha, Chaminda (editor) / Gajanayake, Pradeep (editor) / Wijerathna, W. S. M. S. K. (author) / Lindamulla, L. M. L. K. B. (author) / Rathnayake, R. M. L. D. (author)
International Conference on Sustainable Built Environment ; 2022 ; Yogyakarta, Indonesia
2023-08-10
10 pages
Article/Chapter (Book)
Electronic Resource
English
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