Abstract
Conventional treatment such as sedimentation, aeration and activated sludge are only capable to remove organic matter. The color removal in the waste water treatment required as post-treatment at the end of the process. Dye can reduce the aesthetic value of a water body. Dye containing are not included in the textile industry’s quality standards in Indonesia. The subjective of this study is to improve the quality of waste water for textile waste water treatment plants using the ozone oxidation process. Real waste water from the waste water treatment plant were used and treated by biological processes. The ozone treatment reactor has 2 L volume and flowed with ozone at a dose 0.05 and 0.5 mg/minute. The main parameters that is removed in this study are color and COD. Efficiency of colors removal reached 92% and 93%, whilst efficiency of COD removal reached 78% and 83.5%. Based on the quality standards of textile waste water in Minister of Environment Regulation No. 51/2014 and Government Regulation of Republic of Indonesia No. 82/2001 (Class 4 designation) parameters COD, BOD5, total phenol, and total ammonia (NH3-N) have met the quality standards.
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