EFFECT OF FeCl3 COAGULAN DOSAGE ON DECREASING TURBIDITY OF LEATHER TANNERY WASTE PROCESSING

Nanda Brilian Tantri; Swatika Juhana; Ragil Yuliatmo

Nanda Brilian Tantri Prodi Teknologi Pengolahan Kulit, Politeknik ATK Yogyakarta, Jl. Ateka, Ngoto, Bangunharjo, Sewon, Bantul, 55187
Swatika Juhana Prodi Teknologi Pengolahan Kulit, Politeknik ATK Yogyakarta, Jl. Ateka, Ngoto, Bangunharjo, Sewon, Bantul, 55187
Ragil Yuliatmo Prodi Teknologi Pengolahan Kulit, Politeknik ATK Yogyakarta, Jl. Ateka, Ngoto, Bangunharjo, Sewon, Bantul, 55187

Keywords: koagulan, FeCl3, turbiditas, limbah penyamakan kulit, kadar krom

Abstract

The leather tanning industry is one of the industries that produces liquid waste. The liquid waste of the leather tanning industry contains pollutants with a high level of turbidity. This research was conducted to determine variations in the dose of FeCl₃ as a coagulant to reduce the turbidity of leather tanning wastewater. The coagulant added was 5 mL of FeCl₃ with various doses of 1%, 2%, 3%, 4% and 5%. The optimum dose of FeCl3 coagulant to treat 300 mL of liquid waste is 3% with a volume of 5 mL, which means that 500 mg/L or 500 ppm is needed. The results showed a decrease in turbidity at the optimum dose was 94%, a decrease in chromium content of 83,53%. This shows that the effect of FeCl₃ on reducing total chromium content and turbidity gives quite good results.