potential use of polyaluminium chloride and tobacco leaf as coagulant and coagulant aid in post-treatment of landfill leachate

a study was conducted to treat stabilized leachate by applying polyaluminium chloride (pac) and tobacco leaf extract as a coagulant and coagulant aid. experimental results indicated that the tobacco leaves were positively charged. the removal rate of the chemical oxygen demand, using 1500 mg/l pac as a sole coagulant, was approximately 63% and increased to 91% when 1000 mg/l pac was mixed with 1000 mg/l tobacco leaf. additionally, 1500 mg/l pac with 250 - 1000 mg/l tobacco leaf and 54% ammoniacal nitrogen was removed, compared with only 46% reduction using 1500 mg/l with only 46% reduction.