好氧段是什么意思？具体概念是什么？

好氧段是指工业工艺中需要消耗氧气的工业阶段
英语解释为Aerobic Stage 或aerobic phase
例句：
Study on Influence Factors to Treatment of Coke Plant Wastewater at Aerobic Stage in A_1-A_2-O Biofilm System
A_1-A_2-O生物膜系统处理焦化废水试验中好氧段影响因素的研究
If the temperature of anaerobic phase drops to 15 ℃, the HRT of anaerobic phase needs to extend to 12.7 h, and the HRT of aerobic phase needs to extend to 33.1 h, we can get the same result; but the temperature of aerobic phase must be above 25 ℃,and the COD of effluent can be less than 300 mg/L.
当缺氧段温度降至15℃时,缺氧段和好氧段HRT分别延长至12.7h和33.1h,才可达到同样的效果,但好氧段温度必须满足25℃,才能使出水COD达到300mg/L以下的目标。