Degradation of textile dyes Remazol Brilliant Blue using plasma electrolysis method with the addition of microbubble and Fe²⁺ ion

Dye waste is a liquid waste that mostly generated from the textile industry and is very dangerous for the environment. Plasma electrolysis method is an effective method in degrading dye waste because of its ability to produce radical OH in large quantities. This study aims to test the ability of plasma electrolysis method to degrade one of the textile dyes, Remazol Brilliant Blue, with the addition of Fe²⁺ ion and microbubble. The dye waste degredation reached 99.74% for 180 minutes with the addition of 40 mg/L of Fe²⁺ ion as a result of fenton reaction. The addition of microbubble will also increase OH radical production by up to 4.8% and be able to reduce energy consumption by 11.3%. The COD value decreased until 20.56 mg/L and has fulfilled the Government standard of 50 mg/L. In addition, the dye waste concentration decreased significantly from 150 mg/L to 0.388 mg/L. Maximum conditions are obtained by using 0.02 M Na₂SO₄, 700 Volt operating voltage, and 1 cm anode depth.