Physicochemical wastewater treatment improvement by hydrodynamic cavitation nanobubbles

IF 6.3 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of water process engineering Pub Date : 2024-11-21 DOI:10.1016/j.jwpe.2024.106581

Carlos A. Quintero-González , Julián Martínez , Julio C. Calva-Yáñez , Mercedes T. Oropeza-Guzmán

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Abstract

Hydrodynamic nanobubble aeration is proposed as an innovative approach to enhancing physicochemical wastewater treatment. Integrating a novel cavitation system to replace conventional aeration significantly improves standard oxygen transfer efficiency and energy consumption. The changes in size and surface charge of air, oxygen (O₂), ozone (O₃), and chitosan nanobubbles were studied as a function of the reactor diameter. Interestingly, it was found that increasing the radial dispersion length had no significant effect on the measured parameters. Flotation, Coagulation-flocculation (CF), and Advanced Oxidation (AOPs) processes of municipal wastewater comparing convective air and O₃ NBs aeration were carried out at pilot plant scale. The use of O₃ NBs in the flotation process improves 160 % the suspended solids removal compared to the air-NBs- process. The CF process was evaluated by adding a chitosan dose to the convective processes and monitoring the water quality parameters in real-time. The results demonstrated that the interaction of chitosan with O₃ NBs eliminates more than 80 % of the initial chemical oxygen demand (COD). Finally, the AOP carried out with O₃ NBs reaches a removal efficiency of 99.8 % total suspended solids and 90 % COD. This modular system presents a practical and efficient alternative for removing municipal and industrial wastewater contaminants.

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利用水动力空化纳米气泡改善废水的物化处理效果

水动力纳米气泡曝气是一种提高废水物化处理效果的创新方法。利用新型空化系统取代传统曝气，可显著提高标准氧传输效率和能耗。研究了空气、氧气（O2）、臭氧（O3）和壳聚糖纳米气泡的尺寸和表面电荷随反应器直径的变化。有趣的是，研究发现增加径向分散长度对测量参数没有显著影响。在中试工厂规模的城市污水浮选、混凝-絮凝（CF）和高级氧化（AOPs）过程中，对流空气和 O3 NBs 曝气进行了比较。在浮选工艺中使用 O3 NBs 比使用空气-NBs 工艺提高了 160% 的悬浮固体去除率。通过在对流工艺中添加壳聚糖剂量并实时监测水质参数，对 CF 工艺进行了评估。结果表明，壳聚糖与 O3 NBs 的相互作用消除了 80% 以上的初始化学需氧量（COD）。最后，使用 O3 NBs 进行的 AOP 对总悬浮固体的去除率达到 99.8%，对 COD 的去除率达到 90%。这种模块化系统为去除城市和工业废水污染物提供了一种实用、高效的替代方法。

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来源期刊

Journal of water process engineering Biochemistry, Genetics and Molecular Biology-Biotechnology

CiteScore

10.70

自引率

8.60%

发文量

846

审稿时长

24 days

期刊介绍： The Journal of Water Process Engineering aims to publish refereed, high-quality research papers with significant novelty and impact in all areas of the engineering of water and wastewater processing . Papers on advanced and novel treatment processes and technologies are particularly welcome. The Journal considers papers in areas such as nanotechnology and biotechnology applications in water, novel oxidation and separation processes, membrane processes (except those for desalination) , catalytic processes for the removal of water contaminants, sustainable processes, water reuse and recycling, water use and wastewater minimization, integrated/hybrid technology, process modeling of water treatment and novel treatment processes. Submissions on the subject of adsorbents, including standard measurements of adsorption kinetics and equilibrium will only be considered if there is a genuine case for novelty and contribution, for example highly novel, sustainable adsorbents and their use: papers on activated carbon-type materials derived from natural matter, or surfactant-modified clays and related minerals, would not fulfil this criterion. The Journal particularly welcomes contributions involving environmentally, economically and socially sustainable technology for water treatment, including those which are energy-efficient, with minimal or no chemical consumption, and capable of water recycling and reuse that minimizes the direct disposal of wastewater to the aquatic environment. Papers that describe novel ideas for solving issues related to water quality and availability are also welcome, as are those that show the transfer of techniques from other disciplines. The Journal will consider papers dealing with processes for various water matrices including drinking water (except desalination), domestic, urban and industrial wastewaters, in addition to their residues. It is expected that the journal will be of particular relevance to chemical and process engineers working in the field. The Journal welcomes Full Text papers, Short Communications, State-of-the-Art Reviews and Letters to Editors and Case Studies