Ozonation of wastewater effluent by the MEMBRO3X contactor: Micropollutants abatement and bromate mitigation

IF 11.4 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research Pub Date : 2025-05-17 DOI:10.1016/j.watres.2025.123853

Jaedon Shin, Tony Merle, Arnaud Cockx, Caroline Gachet Aquilon, Urs von Gunten

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Abstract

Wastewater treatment plants (WWTPs) are significant sources of micropollutants, potentially adversely affecting freshwater ecosystems. Ozonation is an effective way to abate micropollutants during treatment of wastewater effluent, however, the presence of bromide may lead to bromate, a potentially carcinogenic byproduct. The applicability of a hollow fiber porous membrane-based ozone contactor (MEMBRO₃X) was assessed for wastewater effluent treatment for the simultaneous abatement of micropollutants and bromate mitigation by investigating the effects of operating conditions (e.g., hydraulic retention times, gas phase concentrations of ozone and hydrogen peroxide dosing) and water quality parameters (concentration of dissolved organic matter (DOM) and level of alkalinity). In synthetic water containing Suwannee River Natural Organic Matter and bromide, MEMBRO₃X showed better performance for relative micropollutant abatement with minimal bromate formation compared to the conventional ozonation in the presence of high DOC concentration and high alkalinity for ozone gas phase concentrations of ≤ 10 gO₃ Nm^-3. Key ozone mass transfer parameters, including liquid velocity and membrane length, were also investigated to support interpretation of treatment performance. Adding H₂O₂ improved ozone mass transfer at the membrane interface, but also elevated bromate formation, making this an unfavorable option. Three secondary wastewater effluent samples were investigated, and a similar trend as for synthetic DOM-containing water was observed regarding water quality and process operating conditions. The calculated required membrane surface areas for the MEMBRO₃X process are 15 to 60 m² per cubic meter of treated water per hour, which aligns with typical membrane-based filtration systems. This suggests that the MEMBRO₃X process is a practical solution for effective micropollutant abatement with minimized bromate formation.

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MEMBRO3X接触器对废水的臭氧化处理：微污染物减排和溴酸盐减排

污水处理厂（WWTPs）是微污染物的重要来源，可能对淡水生态系统产生不利影响。臭氧化是在废水处理过程中减少微污染物的有效方法，然而，溴化物的存在可能导致溴酸盐的产生，这是一种潜在的致癌副产品。通过研究操作条件（如水力滞留时间、臭氧气相浓度和过氧化氢投加量）和水质参数（溶解有机物（DOM）浓度和碱度）的影响，评估了中空纤维多孔膜臭氧接触器（MEMBRO3X）在废水处理中同时减少微污染物和溴酸盐的适用性。在含Suwannee河天然有机物和溴化物的合成水中，当臭氧气相浓度≤10 gO3 Nm-3时，在高DOC和高碱度条件下，MEMBRO3X在溴酸盐生成最少的情况下表现出比常规臭氧化更好的相对微污染物减排效果。关键的臭氧传质参数，包括液体速度和膜长度，也进行了研究，以支持对处理性能的解释。添加H2O2改善了膜界面上的臭氧传质，但也增加了溴酸盐的形成，这是一个不利的选择。对3个二次废水出水样品进行了调查，在水质和工艺操作条件方面观察到与含dom合成水相似的趋势。计算出MEMBRO3X工艺所需的膜表面积为每小时每立方米处理水15至60平方米，这与典型的膜基过滤系统一致。这表明MEMBRO3X工艺是一种有效减少溴酸盐生成的微污染物的实用解决方案。

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来源期刊

Water Research 环境科学-工程：环境

CiteScore

20.80

自引率

9.40%

发文量

1307

审稿时长

38 days

期刊介绍： Water Research, along with its open access companion journal Water Research X, serves as a platform for publishing original research papers covering various aspects of the science and technology related to the anthropogenic water cycle, water quality, and its management worldwide. The audience targeted by the journal comprises biologists, chemical engineers, chemists, civil engineers, environmental engineers, limnologists, and microbiologists. The scope of the journal include: •Treatment processes for water and wastewaters (municipal, agricultural, industrial, and on-site treatment), including resource recovery and residuals management; •Urban hydrology including sewer systems, stormwater management, and green infrastructure; •Drinking water treatment and distribution; •Potable and non-potable water reuse; •Sanitation, public health, and risk assessment; •Anaerobic digestion, solid and hazardous waste management, including source characterization and the effects and control of leachates and gaseous emissions; •Contaminants (chemical, microbial, anthropogenic particles such as nanoparticles or microplastics) and related water quality sensing, monitoring, fate, and assessment; •Anthropogenic impacts on inland, tidal, coastal and urban waters, focusing on surface and ground waters, and point and non-point sources of pollution; •Environmental restoration, linked to surface water, groundwater and groundwater remediation; •Analysis of the interfaces between sediments and water, and between water and atmosphere, focusing specifically on anthropogenic impacts; •Mathematical modelling, systems analysis, machine learning, and beneficial use of big data related to the anthropogenic water cycle; •Socio-economic, policy, and regulations studies.