SBR工艺去除模拟城市污水中双酚A的研究

The study of removing Bisphenol A using synthetic wastewater by the sequencing batcher reactor (SBR) technique

依次改变SBR系统(厌氧—好氧—缺氧模式)的水力停留时间(HRT)、好氧—缺氧段时间比以及污泥龄(SRT),并采用液相色谱法对系统双酚A(BPA)浓度进行了检测,从BPA去除的角度对SBR工艺进行了评估,同时对部分工艺运行参数进行了优化。结果表明,SBR工艺对BPA有较好的去除能力;在温度为20℃、充水比(SBR工艺1个周期中进入反应器的污水量与反应器有效容积之比)为50%的条件下,最佳的工艺运行参数为总HRT=480min,SRT=25d,厌氧、好氧、缺氧段HRT分别为90、150、180min;好氧—缺氧段时间比为0.83,此时COD、TN和PO34--P的总去除率分别达到89%、69%和95%,BPA总去除率达到99%,其中厌氧、好氧、缺氧段BPA去除率分别占BPA总去除率的66%、32%和1%。BPA在上述SBR系统中的去除主要是通过厌氧段污泥吸附和好氧段的生物降解实现的。

The laboratory scale study of removing Bisphenol A （BPA） in synthetic wastewater by using sequential batch reactor （SBR） was studied. The concentration of BPA was measured by HPLC. We followed the sequence change of the SBR system （anaerobic,aerobic, anoxic）, hydraulic retention time （HRT）, the change in the sludge retention time （SRT）,and the ratio of aerobic/anoxic change in order to investigate the effects on BPA removing efficiency. The results demonstrated that BPA can be effectively removed in SBR. The optimum operation parameters for both nutrient and BPA removal were： HRT= 480 min and SRT= 25 d; anaerobic,aerobic and anoxic time is 90 min, 150 min and 180 min,respectively; the time ratio of aerobic/anoxic is 0.83. Under the above optimum conditions,the removal efficiency of chemical oxygen demand （COD）, TN and PO4^3- -P were 89 %, 69 % and 95 %, respectively. The BPA removing efficiency reached the level of 99 %. Under aerobic,anaerobic and anoxic conditions, the BPA removal percentages were 66%, 32% and 1%, respectively. In the SBR system, BPA was removed by the sorption on the sludge in the anaerobic stage and followed biodegradation in the aerobic stage.