Fe3+除磷对缺氧好氧膜生物反应器工艺运行性能及生物除磷的影响  

Effect of iron addition on the performance of anoxic-oxic membrane process and biological phosphorus removal

作　　者：刘盼 王玉兰[1] 苏馈足[1] LIU Pan;WANG Yulan;SU Kuizu(Department of Civil Engineering, Hefei University of Technology, Hefei 230009, Chin)

机构地区：[1]合肥工业大学土木与水利工程学院

出　　处：《应用与环境生物学报》2018年第3期557-562,共6页Chinese Journal of Applied and Environmental Biology

基　　金：安徽省自然科学基金(JZ2015AKZR0058);合肥工业大学青年教师科研创新项目(2013HGQC0002)资助~~

摘　　要：针对膜生物反应器（MBR）较长的污泥龄导致磷的处理效果差的问题,采用铁盐强化除磷,向反应器中投加n（Fe）/n（P）=2.0的Fe Cl3·6H2O,系统考察膜生物反应器对氮、有机物及磷的去除效果,重点考察膜生物反应器投加铁盐前后运行性能、活性污泥菌群及膜污染速率变化情况.结果显示,在氮、有机物去除方面,投加前后没有发生明显的变化,去除率始终保持在90%左右.在磷去除方面,投加前磷的平均去除率为52%,投加后去除率提高了近40%,去除效果显著提升.实验进一步研究了加入三价铁盐前后对活性污泥优势菌群和生物除磷的影响.铁盐的投加降低了活性污泥菌群多样性及部分已知聚磷菌的相对丰度,对生物除磷造成一定的负面影响.在膜污染方面,通过跨膜压差（TMP）记录分析此浓度的铁盐并没有导致膜生物反应器膜组件膜污染的加剧.本研究表明,该浓度（n（Fe）/n（P）=2.0）的铁盐进入膜生物反应器会对体系内活性污泥聚磷菌的相对丰度及生物除磷效率造成一定程度上的降低,但对膜污染没有明显影响,可以使出水各项指标尤其是磷的尾水排放浓度达标.In order to solve the problem of poor treatment of phosphorus in membrane bioreactor（MBR） with long sludge retention time（SRT）, a ferric salt was added to enhance phosphorus removal; FeCl_3·6H_2 O（Fe/P = 2.0） was added to the reactor. The removal efficiency of nitrogen, organic matters, and phosphorus in the MBR was investigated systematically. Moreover, this study focused on the membrane performance, the change of active sludge flora, and the effect of adding a ferric salt on membrane fouling before and after the addition. It was seen that adding the ferric salt could not affect the removal of COD and NH_4~＋-N and the removal rate of COD and NH4＋-N reached over 90%. However, the average removal rate of phosphorus was 52%, while the removal rate increased by nearly 40% after adding the ferric salt. The effects of adding ferric salts on the dominant bacteria and biological phosphorus removal of activated sludge were further studied. The results showed that the addition of ferric salt（Fe/P = 2.0） decreased the diversity of active sludge flora and relative abundance of some phosphorusaccumulating organisms and had a negative effect on biological phosphorus removal. The analysis of transmembrane pressure difference（TMP） recording revealed that the concentration of iron salts did not exacerbate membrane fouling. The results showed that the concentration of iron salts entering the membrane bioreactor would reduce the relative abundance and phosphorus removal efficiency of the activated sludge in the system to a certain extent, but it had no obvious effect on membrane fouling. It allowed the eff luent to attain acceptable standards, especially with respect to phosphorus removal efficiency.

关 键 词：缺氧好氧膜生物反应器(A/O-MBR) 化学除磷 菌群结构 生物除磷 膜污染 

分 类 号：X703[环境科学与工程—环境工程]