Comparison of Different Volume Reactor for Batik Wastewater Pre-Treatment with Ozonation to Improve Biodegradability

Batik is a unique ethnic and heritage textile from Indonesia with low biodegradability (BOD5/COD) demanding biological wastewater treatment. However, in its application high value needed. To increase the ozonation process can be used as pre-treatment. The purpose of this study to determine effectiveness ozone pre-treatment color removal, COD changes biodegradability. This was divided into two types reactor volume 2 L 16 each dose 4 mg/min 40 mg/min. results removal showed 85% for 34.6% removal. reduction efficiency occurred 65% L. not evenly distributed at altitude 43; 35; 33% (50; 100; 150 cm). Biodegradability increased 0.143 0,49 (2L reactor) 0.4-0.45 (16L reactor), allows higher Which NH3-N total phenol efficiencies 12.9%-31.4% 3-21.2%, respectively.