预混合和预沉积MIEX-超滤处理含藻水的膜污染控制  

Membrane fouling control in ultrafiltration treatment of containing algal water with pre-mixing and pre-deposition MIEX

作　　者：马聪[1,2] 张萌 王冠英 王亮[1,2] MA Cong;ZHANG Meng;WANG Guanying;WANG Liang(School of Environmental Science and Engineering,Tiangong University,Tianjin 300387,China;State Key Laboratory of Separation Membranes and Membrane Processes,Tiangong University,Tianjin 300387,China)

机构地区：[1]天津工业大学环境科学与工程学院,天津300387 [2]天津工业大学省部共建分离膜与膜过程国家重点实验室,天津300387

出　　处：《天津工业大学学报》2024年第1期42-49,共8页Journal of Tiangong University

基　　金：国家自然科学基金资助项目(51978465);天津市教委科研计划项目(2019KJ009)。

摘　　要：为了降低超滤处理含藻水的膜污染,探究了预混合和预沉积磁性离子交换树脂(MIEX)超滤处理含藻水的膜污染控制。对实验过程中的总阻力、可逆阻力及不可逆阻力进行分析,并使用扫描电子显微镜、三维荧光光谱、不可逆污染组分及超滤过滤模型对膜污染机理进行探究。结果表明:在相同投加量下,预沉积MIEX比预混合MIEX膜污染的控制更好,最大预沉积量为235.2 mL/m^(2)时,膜污染控制最好,此时预沉积MIEX的总阻力、可逆阻力和不可逆阻力分别比预混合MIEX的相应值低52.7%、65.7%和50.1%;蛋白质均是造成2种投加方式不可逆阻力的主要原因;随着预混合投加量的增加,滤饼层厚度从4.82 m降低至4.07 m,滤饼层内藻细胞及胞外有机物(EOM)含量降低;在预沉积MIEX中,随着沉积量的增加,沉积层形态发生变化,当沉积量最大时,沉积层拦截较多藻细胞和EOM,形成明显的藻类滤饼层。In order to reduce the membrane fouling of algal water treated by ultrafiltration,the pre-mixed and pre-deposited magnetic ion exchange resin (MIEX) on algal fouling control was studied.The total resistance,reversible resistance and irreversible resistance in this study were analyzed,and the membrane fouling mechanism was studied by scanning electron microscope,three-dimensional fluorescence spectrum,irreversible pollution component and ultrafiltration model.The results showed that under the same dosage,the membrane fouling control of pre-deposited MIEX was better than that of pre-mixed MIEX.The best control of membrane fouling was achieved at the maximum pre-deposited amount of 235.2 mL/m^(2),then the total resistance,reversible resistance and irreversible resistance of pre-deposited MIEX are 52.7%,65.7%and 50.1%lower than the corresponding values of pre-mixed MIEX,respectively.Both proteins were the main cause of irreversible resistance for both dosing strategies.the thickness of the algal cake layer decreased from 4.82 m to 4.07 m with the increase of pre-mixed dosages,and the content of algal cells and extracellular organic matter (EOM) in the algal cake layer decreased.In the pre-deposited MIEX,the morphology of the sediment layer changed with the increase of the dosage of MIEX,and when the dosage was maximum,the sediment layer intercepted more algal cells and EOM,forming an obvious algal filter cake layer.

关 键 词：超滤 磁性离子交换树脂 含藻水 膜污染 预混合 预沉积 

分 类 号：TQ028.8[化学工程]