The Effect of Pacaddition on the pH, Conductivity Total Solids and Turbidity in Wastewater at The Terjun Subdistrict Final Waste Disposal Site, Medan Marelan, North Sumatra

Abstract

Leachate, a hazardous liquid waste from landfills (landfills), is characterized by low pH, high turbidity, and high concentrations of dissolved solids and ions. This study evaluated the effects of various doses of Poly Aluminum Chloride (PAC) coagulant on leachate quality parameters, including pH, conductivity, total solids, and turbidity. PAC was applied at doses ranging from 0 to 1.0 g per 100 mL of leachate. The optimal dose, 0.6 g/100 mL, increased pH from 5.2 to 6.6, reduced turbidity from 680 NTU to 90 NTU, and reduced total solids from 3,200 mg/L to 1,850 mg/L. However, conductivity increased from 1,250 μS/cm to 1,800 μS/cm, indicating higher concentrations of dissolved ions. These results indicate that PAC is effective in improving leachate quality, mainly by reducing turbidity and total solids, although careful dosage selection is required to reduce the potential for dissolved ion accumulation.