CHN Energy Shendong Coal Group Co., Ltd, Erdos 017209, China.
School of Civil Engineering, Chang'an University, Xi'an 710054, China.
Water Sci Technol. 2024 Jun;89(11):3093-3103. doi: 10.2166/wst.2024.154. Epub 2024 May 29.
Hydraulic oil leaks during mechanical maintenance, resulting in flushing wastewater contaminated with dispersed nano-oil droplets. In this study, 75 mg L of polysilicate aluminum ferric (PSAF) was stirred at 350 rpm and the optimal chemical oxygen demand (COD) removal was 71%. The increase of PSAF led to more hydrolysis of Fe, and 1,175 cm hydroxyl bridged with negative oil droplets. At the same molar concentration, PSAF hydrolyzes cationic metals more rapidly than polymeric aluminum chloride (PAC). PSAF forms flocs of smaller complex structures with greater bridging. The Al-O and Si-O peaks occurred at 611 and 1,138 cm, indicating the formation of Si-O-Fe and Si-O-Al bonds on the flocs surface. Higher stirring speeds did not change the free energy of the flocs surface , mainly because the decrease in the van der Waals force () offset the increase of Lewis acid-base force (). Preserving the non-polar surface, in summary, owing to its bridging abilities and affinity for non-polar surfaces, PSAF demonstrates superior efficiency over PAC in capturing and removing oil droplets.
在机械维修过程中，液压油发生泄漏，导致冲洗废水受到分散纳米油滴的污染。在这项研究中，以 350rpm 的速度搅拌 75mg/L 的聚硅铝铁（PSAF），其最佳化学需氧量（COD）去除率为 71%。PSAF 的增加导致更多的 Fe 水解，并与带负电的油滴桥接 1175cm 的羟基。在相同的摩尔浓度下，PSAF 比聚合氯化铝（PAC）更快地水解阳离子金属。PSAF 与较小的复杂结构絮体形成更大的桥接。Al-O 和 Si-O 峰分别出现在 611 和 1138cm 处，表明在絮体表面形成了 Si-O-Fe 和 Si-O-Al 键。更高的搅拌速度并没有改变絮体表面的自由能，这主要是因为范德华力（）的减小抵消了路易斯酸碱力（）的增加。总的来说，由于其桥接能力和对非极性表面的亲和力，PSAF 在捕获和去除油滴方面比 PAC 更有效。
