Characterization and Chemical Treatment of Taman Beringin Landfill Leachate

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Nor Asikir M
Agamuthu P

Abstract

Characterization of landfill leachate from Taman Beringin landfill, Kuala Lumpur, Malaysia was carried out immediately after sample collection. Subsequently, it was treated using alum, ferric chloride (FeCl₃), Fenton's reagent and polyaluminium chloride (PAC) individually. Raw leachate contained COD (5400 mg/L), BOD (1900 mg/L), NH₃-N (3500 mg/L), sulphide (68 mg/L), chloride (260 mg/L) and heavy metals such as Pb (3.38 mg/L), Cu (0048 mg/L), Zn (4.5 mg/L) and Fe (35.8 mg/L). All these parameters were above the EQA 1974 (Standard A and B) limit. At optimal ratio of 1:6 (Fe to H₂O₂), with rapid and slow mixing at 100 - 120 rpm and 30 - 40 rpm, respectively Fenton's reagent was able to reduce about 62% of COD, 58% of BOD, 65% of NH₃-N, 100% of Pb, Cu and Zn, 95% of Al and 82% of Fe. PAC, also at optimal concentration of 0.4g/500 ml, and at pH of 7 with rapid and slow mixing at 100 - 120 rpm and 30 - 40 rpm, was capable of reducing COD and BOD by 59% and 55% respectively. The reduction of NH₃-N, Pb, Al, Fe, Cu and Zn ranged from 51% to 100%. At the optimum concentration of 5g/500ml, alum was capable of reducing about 53% of COD, 49% of BOD, 63% of NH₃-N, 99% of Pb, 100% of Cu, 91% of Al, 100% of Zn and 81% of Fe. Finally, FeCl₃, at optimum concentration, pH and mixing speed, reduced COD by 38% while BOD was reduced by 42%. The reduction of NH₃-N, Pb, Al, Zn and Fe ranged from 41 % to 85%. Fenton's reagent was most effective in reducing most of the above parameters compared to PAC, alum and FeCl₃. Some parameters such as COD, BOD, NH₃-N, Al and Fe still exceeded the EQA 1974 (Standard A and B), although Fenton's reagent was able to reduce Pb, Cu and Zn to below the EQA Standard.
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How to Cite
M, N. A., & P, A. (2007). Characterization and Chemical Treatment of Taman Beringin Landfill Leachate. Malaysian Journal of Science, 26(1), 43–55. Retrieved from http://ojie.um.edu.my/index.php/MJS/article/view/7971
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