Alresheedi Mohammad T
Department of Civil Engineering, College of Engineering, Qassim University, Buraydah 51452, Saudi Arabia.
Membranes (Basel). 2024 Jul 7;14(7):150. doi: 10.3390/membranes14070150.
Organic matter has been identified as a significant type of foulant in membrane processes for water treatment. Its fouling tendency is highly affected by the presence of ions and inorganics. While the effects of ions addition on organic fouling have been extensively researched in the past, studies on the effect of positively-charged inorganics, such as Fe and Mg, on organic fouling are limited. This study investigates the influence of Fe and Mg addition on fouling properties of the Suwannee River Organic Matter (SROM) solution in the MF process, with and without Ca ions. Results showed that increasing the concentration of Fe and Mg from 0-5 mM promoted SROM fouling, and resulted in an increased flux decline up to 33% and 58%, respectively. Cake layer resistance became more dominant with the addition of Fe and Mg, and was counted for more than 60% of the fouling. Mg, however, caused higher internal pore blocking, and facilitated the formation of a less permeable cake layer, compared to Fe. This was evident in the analysis of the cake layer properties and the visualization of the fouling layer. In all cases, SROM fouling with Fe and Mg worsened with the addition of Ca ions. The results of the study indicated the importance of understanding the interaction between organic matter and Fe and Mg, which would provide useful insights on their fouling mechanism and control.
在水处理的膜工艺中，有机物已被确定为一种重要的污垢类型。其结垢趋势受离子和无机物的存在影响很大。虽然过去对添加离子对有机污垢的影响进行了广泛研究，但关于带正电荷的无机物（如铁和镁）对有机污垢影响的研究却很有限。本研究调查了在有无钙离子存在的情况下，添加铁和镁对微滤过程中苏万尼河有机物（SROM）溶液污垢特性的影响。结果表明，将铁和镁的浓度从0 - 5 mM增加会促进SROM污垢形成，通量下降分别增加高达33%和58%。添加铁和镁后，滤饼层阻力变得更加显著，占污垢的60%以上。然而，与铁相比，镁导致更高的内部孔隙堵塞，并促进形成渗透性更低的滤饼层。这在滤饼层特性分析和污垢层可视化中很明显。在所有情况下，添加钙离子会使铁和镁存在时的SROM污垢情况恶化。该研究结果表明了解有机物与铁和镁之间相互作用的重要性，这将为它们的污垢形成机制和控制提供有用的见解。
