本文阐述了常规预处理中混凝剂残留的影响 （快速混合、絮凝、沉淀和双介质过滤）在聚酰胺上反向 渗透（RO）膜性能。测试包括铝的实验 硫酸盐（明矾）、氯化铝（ACH）和三氯化铁混凝剂，各种 助凝剂（阳离子、阴离子和非离子有机聚合物）、游离氯和总氯， 以及基于膦酸盐和聚羧酸的阻垢剂。 结果表明 铝的残余物，尤其是明矾的凝结，造成了反渗透的胶体污染 膜通过与周围二氧化硅相互作用形成硅酸铝，以及 阻垢成分。此外，铝含量升高阻碍了阻垢剂的使用 用于缓解硫酸盐沉淀物的功效。氯化铁混凝 大大降低了胶体污染倾向，Fe（III）的腐蚀性可能会受到侵蚀 非病理性保护金属，导致增强的聚酰胺膜氧化 释放的Fe（II）离子导致氯胺的存在。与三氯化铁类似，ACH 尽量减少胶体污染和潜在的铝阻垢剂相互作用。 然而，膜性能数据表明，ACH预处理条件可能会改变 也有助于增强聚酰胺膜表面的氧化反应。包括30个参考文献、表格和图表。

This paper illustrates the effects of coagulant residuals from conventional pretreatment (rapid mix, flocculation, sedimentation, and dual-media filtration) on polyamide reverse osmosis (RO) membrane performance. Testing included experiments with aluminum sulfate (alum), aluminum chlorohydrate (ACH), and ferric chloride coagulants, various coagulant aids (cationic, anionic, and nonionic organic polymers), free and total chlorine, and phosphonate- and polycarboxylic acid-based antiscalants. Results indicate that aluminum residuals, most notably from alum coagulation, caused colloidal fouling of RO membranes through interactions with ambient silica to form aluminum silicates, and antiscalant components. Furthermore, elevated aluminum hindered antiscalant efficacy used to mitigate sulfate-based precipitates. While ferric chloride coagulation greatly reduced colloidal fouling propensity, the corrosive nature of Fe (III) may attack uncathodically protected metals, leading to enhanced polyamide membrane oxidation in the presence of chloramines by liberated Fe (II) ions. Similar to ferric chloride, ACH minimized colloidal fouling and potentially minimized aluminum-antiscalant interactions. However, membrane performance data suggested that ACH-pretreatment conditions may also facilitate enhanced oxidation reactions on the polyamide membrane surface. Includes 30 references, tables, figures.