Based on stationing monitoring and sampling analysis for a Xi'an sewage treatment works operating with A2/O process and medium loading process, the distribution and transformation regularity of pharmaceutical pollutants were studied. The results showed that there were six typical Pharmaceuticals, Phenacetin, Gemfibrozil, Caffeine, Aminopyrine, Clofibrate acid and Diclofenac acids in flooding water at the concentrations of 14. 98 μg · L-1, 0. 64 μg·L-1, 19. 36 μg· L-1, 2. 15 μg·L-1, 0. 95μg·L-1 and 1. 35 μg· L-1 respectively. And it was found that in both processes the removal efficiencies of Diclofenac acid and Gemfibrozil were about 80%, and over 94% another four pollutants could be removed. The removal efficiency for Clofibrate acid and Aminopyrine is higher in A2/O aeration process than in medium load one. Phenacetin and Gemfibrozil can not be significantly removed by primary treatment, but six typical pharmaceuticals can be obviously adsorbed by sludge for both A2/O and medium load processes, especially for Caffeine, the concentrations in sludge was 1. 42 μg · g-1 for A2/O process, and 1. 24 μg ·g-1 for medium load process. The sludge adsorption capacity in A2/O process was 2-4 times of that in medium load process.%对西安市某污水处理厂A2/O工艺和中负荷工艺布点监测,以分析医药类污染物的分布与迁移转化规律.检测分析表明,污水厂进水中含有非那西丁、吉非罗齐、咖啡因、氨基比林、降固醇酸和双氯芬酸等6种医药类污染物,其浓度分别为14.98 μg·L-1、0.64μg·L-1、19.36 μg·L-1、2.15 μg·L-1、0.95 μg·L-1和1.35 μg·L-1.研究发现,两种工艺下双氯芬酸和吉非罗齐的去除率在80％左右,非那西丁、咖啡因、氨基比林和降固醇酸去除率均大于94％;非那西丁和吉非罗齐的一级处理效果不明显.A2/O曝气池对降固醇酸和氨基比林的去除效果好于中负荷曝气池.两种工艺污泥对6种医药污染物均有一定程度的吸附作用,其中咖啡因的污泥吸附效果最好,污泥浓度达到1.42 μg·g-1 (A2/O),1.24 μg·g-1(中负荷);A2/O工艺的污泥吸附能力是中负荷污泥的2～4倍.
展开▼
