Ozone 9 standard5/18/2023 ![]() ![]() This ammonia elimination was capable of preventing eutrophication in the waterbody. Wastewater treatment with activated sludge operated by different DO levels showed efficiency of 44.2 % (R1) and 68.2 % (R2). Ozone pretreatment reduced NH3-N and COD by 23.8 and 34.1 %. Biological Oxygen Demand (BOD)/COD level increased with ozone pretreatment, from 0.25 to 0.38, COD/TKN level stated at 3.26. This acclimatization study showed the efficiency degradation of NH3-N and COD by 17.7 and 27.5 %. Wastewater treatment began with the seeding and acclimatization process. There are 2 scenarios of treatments in this study: with ozone pretreatment (R1) and without ozone pretreatment (R2). Tis paper aims to know the degradation process of Ammonia-Nitrogen (NH3-N) and Chemical Oxygen Demand (COD) with ozone pretreatment in operated by different DO level activated sludge. Textiles industry like Endek is the main source of Nitrogen and organic matter. Nitrogen and organic matter are part of the pollutant causing eutrophication in freshwater.
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