School of Civil, Environmental and Architectural Engineering, Korea University, Seoul, 02841, Republic of Korea.
School of Civil, Environmental and Architectural Engineering, Korea University, Seoul, 02841, Republic of Korea.
Environ Pollut. 2022 Aug 15;307:119513. doi: 10.1016/j.envpol.2022.119513. Epub 2022 May 21.
The use of membrane-based technology has evolved into an important strategy for supplying freshwater from seawater and wastewater to overcome the problems of water scarcity around the world. However, the presence of natural organic matter (NOM), including humic substances affects the performance of the process. Here, we present a systematic report on the mineralization of humic acid (HA), as a model for NOM, in high concentration of salts using the ultraviolet light-activated peroxymonosulfate (UV/PMS) system as a potential alternative for HA elimination during membrane-based seawater desalination and water treatment processes. Effects of various parameters such as PMS concentration, solution type, pH, anions, and anion-cation matrix on HA mineralization were assessed. The results show that 100%, 78% and 58% of HA (2 mg/L TOC) were mineralized with rate constants of 0.085 min, 0.0073 min, and 0.0041 min after 180 min reaction time at pH 7 when 0.5 mM PMS was used in deionized water, sodium chloride solution (35,000 ppm) and synthetic seawater, respectively. The reduced efficiency under saline conditions was attributed to the presence of anions in the system that acted as sulfate and hydroxyl radicals' scavengers. Furthermore, the safety of the treated synthetic seawater was evaluated by analyzing the residual transformed products. Overall, pretreatment with the UV/PMS system mitigated fouling on the RO membrane.
膜基技术的应用已经发展成为从海水中供应淡水和处理废水的重要策略，以解决全球水资源短缺问题。然而，天然有机物（NOM）的存在，包括腐殖质，会影响处理过程的性能。在这里，我们系统地报告了在高盐浓度下用光活化过一硫酸盐（UV/PMS）系统矿化腐殖酸（HA）的情况，HA 是 NOM 的模型化合物，该系统是海水淡化和水处理过程中去除 HA 的潜在替代方法。评估了各种参数的影响，如 PMS 浓度、溶液类型、pH 值、阴离子以及阴离子-阳离子基质对 HA 矿化的影响。结果表明，在 pH 值为 7 时，当使用 0.5 mM 的 PMS 分别在去离子水、氯化钠溶液（35,000 ppm）和人工海水中反应 180 分钟后，2 mg/L TOC 的 HA 的矿化率分别达到 100%、78%和 58%，相应的速率常数分别为 0.085 min、0.0073 min 和 0.0041 min。在盐度条件下效率降低是由于系统中存在阴离子，它们充当了硫酸盐和羟基自由基的清除剂。此外，通过分析处理后的人工海水的残留转化产物来评估其安全性。总体而言，用 UV/PMS 系统进行预处理可以减轻 RO 膜的污染。
