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首页> 外文期刊>The Science of the Total Environment >Ozonation mechanism of carbamazepine and ketoprofen in RO concentrate from municipal wastewater treatment: Kinetic regimes, removal efficiency and matrix effect
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Ozonation mechanism of carbamazepine and ketoprofen in RO concentrate from municipal wastewater treatment: Kinetic regimes, removal efficiency and matrix effect

机译：卡马西平和酮洛芬在城市污水处理反渗透浓缩物中的臭氧化机理：动力学机制，去除效率和基质效应

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A relatively important disadvantage of reverse osmosis (RO) application to municipal wastewater reclamation is related to management of a concentrated waste stream containing high levels of organic contaminants. The present study investigated ozonation performance of RO concentrate from municipal wastewater treatment in a stirred semi-batch reactor. In this work, carbamazepine (CBZ. as a representative of ozone-reactive micropollutants) and ketoprofen (KET, one of ozone-resistant organic chemicals) were selected as target micropollutants. The absence of dissolved ozone within the first 60 min corresponding to initial ozone demand (IOD) complement suggested that chemical reactions took place quite fast, and ozone mass transfer was considered as a limiting step. A complete elimination of CBZ and an excellent removal of KET were observed in this period, indicating that molecular ozone was a dominated oxidant responsible for the decomposition of the target micropollutants in RO concentrate containing initial dissolved organic carbon (DOC_0. ~50.8 mg L~(-1)). >90% of ozone-reactive CBZ was eliminated at a low ozone dose of 0.33 g consumed ozone per g DOCo. More ozone dose requirement for an equivalent removal of KET was ascribed to its low ozone kinetic rate constant below 10 L mol~(-1) s~(-1). In addition, the presence of high contents of organic matters and alkalinity in RO concentrate exhibited pronounced effects on the degradation of KET because of a competition with oxidants. Overall, ozonation appeared to be a promising alternative for disposal of RO concentrate in terms of micropollutant removal. However, additional technologies should be followed to further enhance the degradation rate of organic matters for a zero liquid discharge treatment scheme.
机译：反渗透（RO）应用于市政废水回收的一个相对重要的缺点与管理含有高水平有机污染物的浓缩废水有关。本研究研究了在搅拌式半分批反应器中处理城市废水中的RO精矿的臭氧性能。在这项工作中，选择了卡马西平（CBZ。作为臭氧反应性微污染物的代表）和酮洛芬（KET，耐臭氧的有机化学品之一）作为目标微污染物。在最初的60分钟内没有溶解的臭氧对应于初始臭氧需求（IOD）补充，这表明化学反应发生得非常快，并且臭氧质量转移被视为限制步骤。在此期间观察到CBZ的完全消除和KET的优异去除，表明分子臭氧是一种主要氧化剂，负责分解含有初始溶解有机碳（DOC_0。〜50.8 mg L〜（ -1））。在每克DOCo 0.33 g消耗臭氧的低臭氧剂量下，消除了> 90％的与臭氧反应的CBZ。等效去除KET的更多臭氧剂量要求归因于其低于10 L mol〜（-1）s〜（-1）的低臭氧动力学速率常数。另外，由于与氧化剂的竞争，RO精矿中高含量有机物的存在和碱度对KET的降解表现出显着的影响。总的来说，就微量污染物的去除而言，臭氧处理似乎是一种可替代RO浓缩物的有前途的替代品。但是，对于零液体排放处理方案，应遵循其他技术来进一步提高有机物的降解率。

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