Treatment of landfill leachate by using lateritic soil as a natural coagulant

JOURNAL OF ENVIRONMENTAL MANAGEMENT

卷:112

Article

Syafalni¹  Lim, Han Khim¹  Ismail, Norli²  Abustan, Ismail¹  Murshed, Mohamad Fared¹  Ahmad, Anees³ 

[1] Univ Sains Malaysia, Sch Civil Engn, Nibong Tebal 14300, Penang, Malaysia

[2] Univ Sains Malaysia, Sch Ind Technol, Usm Penang 11800, Malaysia

[3] Aligarh Muslim Univ, Dept Chem, Analyt & Environm Chem Div, Aligarh 202002, Uttar Pradesh, India

关键词: Coagulation-flocculation;    Landfill leachate;    Lateritic soil;    Natural coagulant;   

DOI  :  10.1016/j.jenvman.2012.08.001

来源: Elsevier

【 摘 要 】

In this research, the capability of lateritic soil used as coagulant for the treatment of stabilized leachate from the Penang-Malaysia Landfill Site was investigated. The evaluation of lateritic soil coagulant in comparison with commercialized chemical coagulants, such as alum, was performed using conventional jar test experiments. The optimum pH and coagulant dosage were identified for the lateritic soil coagulant and the comparative alum coagulant. It was found that the application of lateritic soil coagulant was quite efficient in the removal of COD, color and ammoniacal-nitrogen content from the landfill leachate. The optimal pH value was 2.0, while 14 g/L of lateritic soil coagulant was sufficient in removing 65.7% COD, 81.8% color and 41.2% ammoniacal-nitrogen. Conversely, the optimal pH and coagulant dosage for the alum were pH 4.8 and 10 g/L respectively, where 85.4% COD, 96.4% color and 47.6% ammoniacal-nitrogen were removed from the same leachate sample. Additionally, the Sludge Volume Index (SVI) ratio of alum and lateritic soil coagulant was 53:1, which indicated that less sludge was produced and was an environmentally friendly product. Therefore, lateritic soil coagulant can be considered a viable alternative in the treatment of landfill leachate. (C) 2012 Elsevier Ltd. All rights reserved.

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