Cyanobacterial bloom causes the release of algal organic matter (AOM), which inevitably affects the treatment processes of natural organic matter (NOM). This study works on treating micro-polluted surface water (SW) by emerging coagulant, namely titanium sulfate (Ti(SO₄)₂), followed by Low Pressure Ultrafiltration (LPUF) technology. In particular, we explored the respective influence of extracellular organic matter (EOM) and intracellular organic matter (IOM) on synergetic EOM-NOM/IOM-NOM removal, functional mechanisms and subsequent filtration performance. Results show that the IOM inclusion in surface water body facilitated synergic IOM-NOM composite pollutants removal by Ti(SO₄)₂, wherein loosely-aggregated flocs were produced, resulting in floc cake layer with rich porosity and permeability during LPUF. On the contrary, the surface water invaded by EOM pollutants increased Ti(SO₄)₂ coagulation burden, with substantially deteriorated both UV₂₅₄-represented and dissolved organic matter (DOC) removal. Corresponded with the weak Ti(SO₄)₂ coagulation for EOM-NOM removal was the resultant serious membrane fouling during LPUF procedure, wherein dense cake layer was formed due to the compact structure of flocs. Although the IOM enhanced NOM removal with reduced Ti(SO₄)₂ dose and yielded mitigated membrane fouling, larger percentage of irreversible fouling was seen than NOM and EOM-NOM cases, which was most likely due to the substances with small molecular weight, such as microcystin, adhering in membrane pores. This research would provide theoretical basis for dose selection and process design during AOM-NOM water treatment.

蓝藻水华导致藻类有机物（AOM）的释放，这不可避免地影响了天然有机物（NOM）的处理过程。这项研究工作是通过使用新兴的混凝剂，即硫酸钛（Ti（SO ₄）₂），然后是低压超滤（LPUF）技术来处理微污染的地表水（SW）。特别是，我们探索了细胞外有机物（EOM）和细胞内有机物（IOM）对协同EOM-NOM / IOM-NOM去除，功能机制和后续过滤性能的各自影响。结果表明，在地表水体中加入IOM有助于Ti（SO ₄）₂协同去除IOM-NOM复合污染物。，其中产生了松散聚集的絮凝物，从而在LPUF期间形成了具有丰富孔隙率和渗透性的絮凝物滤饼层。相反，被EOM污染物入侵的地表水增加了Ti（SO ₄）_2的凝结负担，同时显着降低了以UV ₂₅₄表示的水和溶解性有机物（DOC）的去除。伴随着弱的Ti（SO ₄）₂凝结以去除EOM-NOM，是在LPUF过程中严重的膜污染，其中由于絮凝物的致密结构而形成了致密的滤饼层。尽管IOM通过减少Ti（SO ₄）₂增强了NOM的去除剂量和产生的膜结垢得到缓解，与NOM和EOM-NOM病例相比，发现不可逆结垢的比例更高，这很可能是由于粘附在膜孔中的分子量较小的物质（例如微囊藻毒素）引起的。这项研究将为AOM-NOM水处理过程中的剂量选择和工艺设计提供理论依据。