AC/PMS去除饮用水中Cd^(2+)及膜污染控制机理的研究

Removal of Cd^(2+) from Drinking Water by AC/PMS and Control of membrane Fouling Mechanism

研究了活性炭(AC)耦合过硫酸氢盐(PMS)预处理与超滤工艺联合使用,目的是去除水体内的有机物及Cd^(2+)来保障饮用水安全及缓解膜污染。实验配制了含10 mg/L的腐殖酸与30 μg/L的Cd^(2+)混合水样并采用AC/PMS进行预处理实验,研究表明:当 AC 和 PMS 投加量为分别为 40 mg/L 和 100 μM,预处理时间为 60 min 时,UV_(254)、DOC 和 Cd^(2+)的去除率分别为94.3%、59.1%和91.7%;过滤实验中膜比通量恢复了105.26%;XDLVO理论预测模型发现,混合微污染物的接触角由71.2°降低到了43.3°,胶粒-膜相互作用的总界面能降低了81.51%,超滤膜污染的问题得到了有效地缓解。

Activated carbon (AC) coupled with potassium peroxymonosulfate (PMS) pretreatment process combined with ultrafiltration was studied to remove organic matter and Cd^(2+) in drinking water, and this process ensures drinking water safety and control ultrafiltration membrane fouling. The 10mg/L humic acid (HA) and 30 μg/L Cd^(2+) mixed solution was prepared in the experiment, and the pretreatment process was carried out with activated carbon activated hydrogen persulfate (AC/PMS). The results showed that the removal rates of UV_(254), DOC, and Cd^(2+) under the condition of 40 mg/L of AC, 100 μM of PMS addition, and 60 min pretreatment time were 94.3%, 59.1%, and 91.7%, respectively. The specific flux of the membrane was recovered by 105.26% in the ultrafiltration. The XDLVO theoretical prediction model found that the contact angle of mixed micro pollutants decreased from 71.2 ° to 43.3 ° , and the total interfacial energy of the colloid-membrane interaction decreases by 81.51%, thus the ultrafiltration membrane fouling was effectively alleviated.