Abstract
Landfill leachate is a highly polluted and generated from water infiltration through solid waste produced domestically and industrially. In this study, a coagulation–flocculation process using a combination of Polyaluminium chloride (PACl) as a coagulant and Dimocarpus longan seed powder (LSP) as coagulant aid was used in treating landfill leachate. LSP has been tested as the main coagulant and as coagulant aid with PACl. As the main coagulant, the optimum dosage and pH for PACl were 5 g/L and 6, respectively, with removal efficiencies of 67.44%, 99.47%, and 98% for COD, SS, and color, respectively. For LSP as the main coagulant, results show that LSP is not effective where the removal efficiencies obtained for COD, SS, and color were 39.40%, 22.20%, and 28.30%, respectively, with the optimum dosage of 2 g/L and pH 4. The maximum removal efficiencies of COD, SS, and color were 69.19%, 99.50%, and 98.80%, respectively, when LSP was used as coagulant aid with PACl. Results show that using LSP as coagulant aid was found to be more effective in the removal of COD, SS, and color with less PACl dosage. The PACl dosage was decreased from 5 to 2.75 g/L when LSP was used as a coagulant aid. Cost estimation for using PACl alone and using LSP as the coagulant aid showed a reduction in the cost of approximately 40% of the cost of using PACl alone. Overall, this study confirmed the efficiency of LSP to be used as a natural coagulant aid in leachate treatment.
Highlights
Landfill is the most widely accepted and prevalent methods for municipal solid waste (MSW)disposal in developing in many countries around the world due to its inherent forte in terms cost saving and simpler operational mechanism [1]
The main goal of this study is to investigate the applicability of composite coagulant made from longan seed powder (LSP) as a natural coagulant in removing color, chemical oxygen demand (COD) and Suspended Solids (SS) from stabilized leachate
Compared to when polyaluminum chloride (PACl) was used alone, a slight improvement of COD, color, The application of the coagulation–flocculation process to landfill leachate was examined in this and SS removal efficiencies were obtained when PACl was used as a main coagulant and LSP as a study using longan seed powder (LSP) as a natural coagulant aid
Summary
Landfill is the most widely accepted and prevalent methods for municipal solid waste (MSW)disposal in developing in many countries around the world due to its inherent forte in terms cost saving and simpler operational mechanism [1]. Landfill is the most widely accepted and prevalent methods for municipal solid waste (MSW). Environmental pollution caused by the landfill leachate has been one of the typical dilemmas of landfilling method [2]. Leachate is the liquid produced when water percolates through solid waste and contains dissolved or suspended materials from various disposed materials and decomposition process. It is often high-strength wastewater with extreme pH, chemical oxygen demand (COD), biochemical oxygen demand (BOD), inorganic salts and toxicity [3,4]. Its composition differs over the time and space within a particular landfill, influenced by a broad spectrum of factors such as waste composition, landfilling practice (solid waste contouring and compacting), local climatic conditions [5], landfill’s physicochemical conditions, biogeochemistry and landfill age [6].
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
