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Colour removal from landfill leachate by coagulation and flocculation processes.
Hamidi Abdul Aziz1, Salina Alias, Mohd Nordin Adlan
1School of Civil Engineering, Universiti Sains Malaysia, Engineering Campus, 14300 Nibong Tebal, Penang, Malaysia. cehamidi@eng.usm.my
Bioresource Technology
|January 3, 2006
Summary
Ferric chloride effectively removes 94% of color from semi-aerobic landfill leachate. This study highlights ferric chloride as a viable coagulant for managing leachate color issues.
Area of Science:
- Environmental Science
- Water Treatment
Background:
- Landfill leachate poses environmental challenges due to its color.
- Semi-aerobic landfill leachate in Malaysia requires effective treatment for color removal.
Purpose of the Study:
- To investigate the efficiency of coagulation and flocculation for removing color from landfill leachate.
- To compare the effectiveness of four different coagulants: aluminum (III) sulfate, ferric (III) chloride, ferrous (II) sulfate, and ferric (III) sulfate.
Main Methods:
- Standard jar test apparatus was used to evaluate coagulant performance.
- Coagulant dosages and pH were optimized for color removal.
- Color, Chemical Oxygen Demand (COD), turbidity, and suspended solids were measured.
Main Results:
- Ferric chloride demonstrated superior performance, achieving 94% color removal.
- The optimum dose for ferric chloride was 800 mg/l at pH 4.
- Coagulant dosage effects on color removal correlated with changes in COD, turbidity, and suspended solids.
Conclusions:
- Color in landfill leachate is primarily attributed to organic matter and insoluble suspended solids.
- Ferric chloride is a highly effective and viable coagulant for treating colored landfill leachate.
- Coagulation and flocculation are efficient processes for mitigating color pollution from landfills.