课题组张大为同学于《Environmental Research》期刊上发表了题为《Synergistic mitigation of algal-induced ultrafiltration membrane fouling by a sodium alginate and biochar pretreatment strategy》的论文。

生物污染是限制超滤膜技术大规模应用的关键瓶颈。本研究提出了一种海藻酸钠（SA）与生物炭（BC）协同预处理策略，以专门缓解藻致超滤膜污染。结果表明，BC投加量为0.2—1.0 g BC/L时，最终膜通量由48.9 L m⁻² h⁻¹（LMH）显著提升至116.4—243.4 LMH，浊度和溶解性有机碳（DOC）去除率分别达到75.6%—97.7%和45.8%—65.5%；在2.5 mg SA/g BC条件下，膜通量进一步升至239.4 LMH，可逆污染和不可逆污染分别由未处理时的3.19×10¹² m⁻¹和2.09×10¹² m⁻¹降至0.34×10¹² m⁻¹和0.089×10¹² m⁻¹。机理上，BC表面的羟基化钙组分与藻细胞表面的结合态胞外有机物（bEOM）发生特异性絮凝，适量外源SA可进一步增强该作用；且BC-SA联合预处理几乎不受水体pH和阴离子类型影响，可视为一种绿色、通用、高效的策略。该研究为高密度含藻水体的处理提供了有效解决方案。

Abstract

Biofouling is a critical bottleneck restricting the large-scale application of ultrafiltration (UF) membrane technology. This study proposes a synergistic pretreatment strategy using sodium alginate (SA) and biochar (BC) to specifically address UF membrane biofouling. Results showed that BC dosage at 0.2–1.0 g BC/L significantly elevated the final flux increasing from 48.9 L m⁻² h⁻¹ (LMH) to 116.4–243.4 LMH, while the corresponding turbidity and dissolved organic carbon (DOC) removal efficiencies reached 75.6%–97.7% and 45.8%–65.5% respectively. Meanwhile, the addition of SA at a concentration of 2.5 mg SA/g BC further enhanced the flux to 239.4 LMH, while the reversible and irreversible fouling decreased from untreated values of 3.19×10¹² m⁻¹ and 2.09×10¹² m⁻¹ to 0.34×10¹² m⁻¹ and 0.089×10¹² m⁻¹, respectively. Mechanistically, hydroxylated calcium components on BC surface specifically flocculated with bound extracellular organic matter (bEOM) on algal cells, an effect that is further enhanced under the condition of appropriate external SA. More importantly, the combined BC-SA pretreatment is almost unaffected by pH and anions in water, and can therefore be regarded as a green, universal, and efficient strategy. The findings of this study provide an effective solution for the treatment of high-density algae-laden water bodies.

Keywords

Ultrafiltration membrane fouling; Synergistic pretreatment; Sodium alginate; Biochar; Extracellular organic matter

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【文章链接】https://doi.org/10.1016/j.envres.2026.126486