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Treatment of Kulim and Kuala Sepetang Landfills Leachates in Malaysia using Poly-Aluminium Chloride (PACl)

Author Affiliations

  • 1 School of Civil Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, MALAYSIA

Res.J.chem.sci., Volume 3, Issue (3), Pages 52-57, March,18 (2013)

Abstract

The main concern in sanitary landfill management is leachate generation that is known to be highly polluted wastewater. Migrations of untreated leachates are potential sources of hazardous contaminants in soil, groundwater and surface water. This paper is focused on landfill leachate treatment by coagulation-flocculation process using poly-aluminum chloride (PACl) as coagulant. The performance of PACl was evaluated by removal of suspended solid (SS), turbidity, colour, chemical oxygen demand (COD) and ammonia nitrogen (NH-N) by jar-test experiments. Samples used in this study were collected from Kulim Landfill Site (KLS) and Kuala Sepetang Landfill Site (KSLS) in Malaysia. The results show that, pH optimum for KLS was obtained at pH 7 while KSLS at pH 6. In this study, optimum dosage of PACl for KLS and KSLS leachates was concluded at 500 mg/L and 1000 mg/L respectively. At optimum dosage, PACl successfully removed 98% SS, 92% turbidity, 100% colour, and 70% COD in KLS leachates while the removal percentage of SS, turbidity, colour and COD in KSLS leachate were 94%, 96%, 95%, and 70% respectively. These results showed a good performance of PACl as coagulants in landfill leachates treatment. However, PACl was less effective in treating NH3-N. Low removal efficiency may be due to NH3-N and PACl cationic nature, it is suggested that additional of coagulant aids with anionic characteristic may improve the performance of coagulation–flocculation process in removing contaminants like NH3-N in landfill leachates.

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