Efficient organic removal from hypersaline reverse osmosis concentrates through a hybrid microbubble ozonation-coagulation process: A two-stage removal procedure caused by two-sided effect of salinity

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

Water Research Pub Date : 2025-05-24 DOI:10.1016/j.watres.2025.123880

Mengwen Liu, Yuhan Yang, Yiqiao Shi, Caitong Shi, Shiyi Hu, Yadong Wang, Lu Xu, Xue Bai, Xuan Shi, Xin Jin, Pengkang Jin

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Abstract

Removal of organic matter in hypersaline reverse osmosis concentrate (ROC) poses significant challenges. In this study, the hybrid microbubble ozonation-coagulation (HOC) process was established for actual hypersaline ROC treatment from energy chemical industry. In this HOC process, the hypersaline environment facilitated the formation of microbubbles, which enhanced ozone mass transfer and ensured an adequate dissolved ozone concentration. Efficient organic removal was achieved through a two-stage procedure: a rapid-removal stage dominated by coagulation (≤ 30 min) and a slow-removal stage dominated by ozone oxidation (> 30 min). Moreover, salinity exhibited two-sided effect on oxidation and coagulation in the HOC process. In the first stage of the treatment process, the alkaline conditions in hypersaline environment promoted oxidation and coagulation through increased •OH production and polymerized Al species generation. However, as the pH decreased owing to coagulant hydrolysis, excessive anions in hypersaline environment inhibited both oxidation and coagulation processes by quenching •OH and promoting large floc generation in the second stage. Furthermore, the two-stage organic removal mechanism was elucidated from the perspectives of oxidative transformation and floc entrapment. In the first stage, high-coagulability organics were directly removed through enhanced coagulation. Meanwhile, low-coagulability organics were oxidized into high-coagulability structures, which were removed via coagulation. In the second stage, organic matter was mainly removed through molecular ozone oxidation, while the coagulation process was inhibited. This study unveiled the two-sided effect of hypersaline environment on oxidation and coagulation, and provided new approaches for enhanced organic removal in the ozone-based process for hypersaline wastewater.

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通过混合微泡臭氧-混凝工艺高效去除高盐反渗透浓缩液中的有机物：由盐度的双面效应引起的两阶段去除过程

去除高盐反渗透浓缩物（ROC）中的有机物提出了重大挑战。在本研究中，建立了混合微泡臭氧-混凝（HOC）工艺，用于能源化工实际高盐的ROC处理。在这个HOC过程中，高盐环境促进了微泡的形成，从而增强了臭氧传质并确保了足够的溶解臭氧浓度。通过两个阶段的程序实现高效的有机去除：以混凝为主的快速去除阶段（≤30分钟）和以臭氧氧化为主的缓慢去除阶段(>；30分钟)。此外，在HOC过程中，盐度对氧化和混凝表现出双重影响。在处理过程的第一阶段，高盐环境中的碱性条件通过增加•OH的生成和聚合Al种的生成来促进氧化和凝血。然而，由于混凝剂水解导致pH降低，高盐环境中过量的阴离子通过淬灭•OH，促进第二阶段大絮凝体的生成，从而抑制氧化和混凝过程。并从氧化转化和絮团包裹两阶段有机去除机理进行了探讨。在第一阶段，通过强化混凝直接去除高混凝性有机物。同时，低混凝性有机物被氧化成高混凝性结构，通过混凝去除。在第二阶段，有机物主要通过分子臭氧氧化去除，同时抑制混凝过程。本研究揭示了高盐环境对氧化和混凝的双重影响，为臭氧法强化高盐废水的有机去除提供了新的途径。

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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.