包埋硝化菌颗粒对17β-雌二醇的去除特性研究

Removal of 17β-estradiol by Embedded Nitrobacteria Pellets

通过升流式内循环流化床对包埋硝化菌进行驯化,研究了包埋硝化菌对17β-雌二醇(E2)的去除特性。包埋硝化菌驯化后期的扫描电镜图片表明,生物膜中的微生物主要是硝化菌。在E2初始浓度为880.0 ng/L、包埋硝化菌投加体积比为5%的条件下,6 h后出水中E2的生物降解中间产物雌酮(E1)的浓度由零升至435.3 ng/L。包埋硝化菌颗粒对E2有良好的降解能力,而且颗粒材料对E2也有一定的物理吸附作用,在两者的共同作用下,对E2的去除率最高可达94.4%;当水温为15℃时,E2的生物降解反应速率常数为0.11 h-1,符合一级反应动力学模型。

Embedded nitrobacteria were acclimated in a lab-scale up-flow inner circulation reactor to investigate the removal characteristics of E2. The photo of SEM showed the microorganisms were mainly nitrobacteria in the late acclimation phase. When the initial concentration of E2 was 880.0 ng/L and embedded nitrifying pellets were added at 5% , the concentration of estrone （ E1 ） , which is the product of E2 biodegradation, in the effluent of reactor increased from 0 to 435.3 ng/L after 6 h. This indicated that E2 was biodegraded by embedded nitrobacteria led to E2 removal rate as high as 94.4%. The bi model, and the rate constant for E2 was 0. 11 h^- 1 , and E2 was partially adsorbed by pellets, two effects odegradation kinetics followed the first-order reaction at 15 ℃.