Evaluation of Poly Aluminium Chloride efficiency in removal COD, TSS, color and turbidity of wastes landfill leachate in Qazvin city in 2011

The most common disposal method in the most countries of the world is in municipal landfills. Contamination from landfill leachate can pose irreparable risks to the environment، particularly to the groundwater. Today، the use of coagulants in water and wastewater treatment is common and use of this material is increasing. The aim of this study was to determine poly aluminium chloride efficiency in removal of COD، TSS، color and turbidity of wastes landfill leachate of Qazvin city. in this study leachate were taken from landfill of Qazvin. Samples were taken during 6 months and the sampling interval was every 2 weeks. The Samples were transported to the laboratory and stored at 4 °C until testing. Experiments were performed according to standard methods for water and wastewater testes. The results showed that the optimum pH and poly aluminium Chloride amount was 7. 5 and 2. 5 gr / L، respectively. The removal efficiency in the optimum conditions for COD، TSS، turbidity and color was 48. 5%، 82. 5%، 73. 5% and 70. 5%، respectively. Qazvin has a high production rate of landfill leachate. Besides، cost effectiveness and high removal efficacy of poly aluminium chloride makes this method a convenient، no high tech technique for treatment of landfill leachate.