This study investigates biological treatment of outlet wastewater from flocculation reactor. This stream has an unpleasant odor. So, a biological treatment unit has been used to separate biological contaminants. Results show that 35 min can be considered as optimum oxygen injection time. Results show that the reduction of nitrate and phosphate is 67% and 60.8% with increasing oxygenation time, respectively. Results show that BOD and COD decrease by about 1.8% and 1% with increasing oxygenation time from 35 to 40 min, respectively. Studies show that organic carbon and petroleum hydrocarbons decrease from 20.1 to 4.8 mg/l and 0.14–0.4 mg/l by increasing oxygen injection time from 5 to 35 min, respectively. Results show that wastewater turbidity decreasing is from 4.3 NTU to 2.1 NTU in biological unit. Results show that range of pH is between 9.9 and 10.4.

本研究探讨了絮凝反应器出口废水的生物处理。这条溪流有难闻的气味。因此，生物处理单元已被用于分离生物污染物。结果表明，35分钟可被认为是最佳注氧时间。结果表明，随着氧化时间的增加，硝酸盐和磷酸盐的减少量分别为 67% 和 60.8%。结果表明，随着充氧时间从 35 分钟增加到 40 分钟，BOD 和 COD 分别降低了约 1.8% 和 1%。研究表明，通过将注氧时间从 5 分钟增加到 35 分钟，有机碳和石油烃分别从 20.1 减少到 4.8 mg/l 和 0.14-0.4 mg/l。结果表明，在生物单元中，废水浊度从 4.3 NTU 降低到 2.1 NTU。结果显示 pH 范围在 9 之间。