Pengolahan Limbah Cair Laboratorium dengan Proses Elektrokoagulasi

Abstract

Liquid Laboratory waste contains dissolved heavy metals, such as mercury (Hg), silver (Ag), and chromium (Cr) in high concentrations and have potential to pollute the environment. The waste produced in small quantities, but the waste are toxic and until now there is no adequate treatment. Electrocoagulation is a liquid waste processing technique by agglomerate and precipitate fine particles in water using electrical energy. The purpose of this research was to determine of variations in power supply voltage and the contact time to find out the best combination of electrocoagulation process regarding the removal efficiency of the pollutants. Liquid waste as much as 500 mL was treated in batch mode using iron electrode. Samples were given a voltage of 6, 9, and 12 V for 1, 2, 3, and 4 hours. The best combination based on the reduction of color, turbidity, and TSS was 12 volts with a contact time of 2 hours. Total cost for the treatment was 85.74 rupiahs per L.