In membrane-based water and wastewater treatment processes, understanding the interactive effect of various types of organic components on membrane fouling is crucial in order to identify effective fouling mitigation strategies. In this study, the effect of humic acid on alginate filtration was examined under both dead-end and crossflow constant flux microfiltration conditions using low viscosity and medium viscosity alginate as model foulants. The presence of humic acid (100 mg/L) appeared to accelerate alginate fouling under both dead-end and crossflow filtration conditions, following cake layer filtration mechanism (dead-end) and a combined intermittent pore blocking and cake layer filtration mechanism (crossflow) respectively. Under the crossflow filtration condition, the fouling mechanism of the alginate-humic acid mixture was dependent with the permeate flux and alginate nature, e.g., less pore blocking with more cake layer fouling were present at a higher permeate flux during filtration medium viscosity alginate-humic acid mixture. When intermittent relaxation was employed during crossflow filtration, the presence of humic acid could alleviate medium viscosity alginate fouling. This was attributed by a significant shift of irreversible fouling to reversible cake layer fouling, which was readily removed by shear force during relaxation. A comparison of membrane performance during intermittent filtration with periodical flushing using clean water, NaClO (5%), and persulfate (100 mg/L) at 50 °C indicates that high temperature clean water flushing was effective in maintaining membrane performance during filtrating alginate-humic acid complex, which majorly contributed to a reduction of reversible cake layer fouling.

在基于膜的水和废水处理过程中，了解各种有机组分对膜结垢的相互作用影响对于确定有效的结垢缓解策略至关重要。在这项研究中，使用低粘度和中等粘度的藻酸盐作为模型污垢剂，在死角和错流恒定通量微滤条件下，考察了腐殖酸对藻酸盐过滤的影响。腐殖酸（100 mg / L）的存在似乎在死层和错流过滤条件下均加速藻酸盐结垢，这遵循滤饼层过滤机理（死端）以及间歇性的孔阻塞和滤饼层过滤机理（错流）分别。在错流过滤条件下 海藻酸盐-腐殖酸混合物的结垢机理取决于渗透通量和藻酸盐性质，例如，在过滤介质粘度高的藻酸盐-腐殖酸混合物过程中，较高的渗透通量下，较少的孔堵塞和更多的滤饼层结垢存在。当在错流过滤过程中采用间歇性松弛时，腐殖酸的存在可以减轻中等粘度的藻酸盐结垢。这归因于不可逆结垢向可逆滤饼层结垢的显着变化，这在松弛过程中很容易通过剪切力去除。比较间歇性过滤和定期用清水，NaClO（5％）冲洗的膜性能