倒置A2/O工艺参数变化对污水中医药类污染物去除的影响

通过实验室模拟的倒置A2/O工艺装置，改变水力停留时间（HRT）、pH、温度和进水浓度等参数来考察医药类污染物非那西丁（PNT）、咖啡因（CAF）、吉非罗齐（GFZ）、双氯芬酸（DCF）和胆固醇（CH）的缺氧、厌氧和好氧生物降解效果，从而了解城市污水中医药类污染物的生物去除规律。研究发现，PNT的生物降解性最好，长的HRT、较高温度和pH中性条件下可被完全降解；CAF在好氧、温度较高与中性条件下，其去除效率为99%；GFZ在中性条件和水温25℃时去除效率达95%；DCF部分吸附到污泥中得到降解，但在酸性条件下，77%的DCF可被污泥吸附而去除；CH在各工艺参数变化下去除效果没有明显的差异，其去除为污泥吸附与微生物降解共同作用。

Influence of technological parameters in inversed A2/O process on removal of pharmaceutical pollutants in wastewater

Pharmaceutical pollutants,such as phenacetin (PNT),gemfibrozil (GFZ),caffeine (CAF),diclofenac acid (DCF) and cholesterol (CH),were biodegraded by a simulated reversed A2/O (anoxic,anaerobic and aerobic) process laboratory apparatus,and effects of hydraulic retention time (HRT),pH,temperature and initial concentration were examined in order to investigate bio-elimination rules of pharmaceutical pollutants in municipal sewage.It showed that PNT had the best biodegradability and could be completely degraded under longer HRT,higher temperature and neutral pH.CAF had biodegradation rate of almost 99% under conditions of aeration,high temperature and neutral pH.GFZ had biodegradation rate of 95% under 25℃ water temperature and neutral pH.Part of DCF was adsorbed to the sludge for degradation,but had biodegradation rate of 77% under acidic condition.Removal efficiency of CH did not differ obviously under different conditions,and its removal capacity was the combined action between sludge adsorption and biodegradation.