1. A techno-economical assessment of treatment by coagulation-flocculation with aluminum and iron-bases coagulants of landfill leachate membrane concentrates.
- Author
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Turan, Ayşenur, Kobya, Mehmet, Iskurt, Cisel, Gengec, Erhan, and Khataee, Alireza
- Subjects
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LEACHATE , *LANDFILLS , *HUMUS , *REVERSE osmosis , *COST analysis , *COAGULANTS , *REVERSE osmosis process (Sewage purification) - Abstract
Landfill leachate treatment involved with the membrane bioreactor (MBR) combined with membrane treatment via nanofiltration (NF) and/or reverse osmosis (RO) is widely used in Turkey. This treatment produces landfill leachate membrane concentrates (LLMCs) with an undesirably high concentration of contaminants. In the study, two different nanofiltration concentrates of leachate were coagulated. Coagulant dosages from 0.10 to 5.0 g of Me3+/L (Me3+: Al3+ or Fe3+), and the pH values ranged from 4.0 to 8.0 and 3.0–9.0 for Al-based and Fe-based coagulants, respectively. The most efficient pH values were 5.0 and 4.0 for Al3+ and Fe3+, respectively. These pH values are lower than those known to be effective in coagulants. The reason for this is the presence of humic substances in the wastewater. The cost of Fe 2 (SO 4) 3. xH 2 O was the lowest than other coagulants at the end of the cost analyses obtained from İstanbul region landfill leachate NF concentrate (NFCL-1) and Kocaeli region landfill leachate NF concentrate (NFCL-2). Under optimum conditions, the costs for NFCL-1 and NFCL-2 were calculated as 0.55 and 0.46 $/removed kg COD, respectively. [Display omitted] • Landfill leachate membrane concentrates was coagulated. • In total, four different types of Al3+ and Fe3+ salts were used. • Detailed cost analysis of the obtained results was presented. • Ferric sulfate and aluminum sulfate were determined as cost-effective coagulants. • The best precipitations were obtained at pH 5 for Al3+ and at pH 4 for Fe3+. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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