Removal of Escherichia coli and Enterococcus faecalis from synthetic wastewater using thermally treated palygorskite as a bacterial adsorbent in fixed bed reactors

IF 2.8 4区生物学 Q3 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Journal of chemical technology and biotechnology Pub Date : 2024-08-02 DOI:10.1002/jctb.7722

Aristodimos Mavrikos, Athanasia.G Tekerlekopoulou, Danae Venieri, Christina.V Lazaratou, Dimitris Vayenas, Dimitris Papoulis

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引用次数: 0

Abstract

BACKGROUND

In pursuit of innovative wastewater treatment solutions, this study investigates the use of thermally treated palygorskite (TP) as an adsorbent to remove Escherichia coli and Enterococcus faecalis from synthetic wastewater. The goal is to explore a natural alternative to chlorine-based disinfectants by utilizing TP's antimicrobial properties. Columns were packed with two granulometries (G1: 0.25–0.6 mm; G2: 1.40–2.36 mm) of TP and arranged in three different configurations (CA1, CA2 and CA3) to assess their bacterial removal efficiency, kinetic behavior and potential for reuse after dry heat sterilization.

RESULTS

The CA3 column configuration, with its multilayer arrangement of TP, achieved the highest bacterial removal efficiency, reaching 99.1% for E. coli and 98.1% for E. faecalis. Kinetic experiments revealed that most bacterial adsorption occurred within the first 3 min, with E. coli requiring up to 10 min to reach maximum removal. TP's antibacterial effectiveness remained above 90% after two reuses. Additionally, dry heat sterilization allowed for repeated use of TP, showing stable removal efficiencies for E. faecalis and a slight decline for E. coli with each successive reuse.

CONCLUSIONS

TP demonstrates significant potential as an adsorbent for wastewater disinfection, particularly in the CA3 multilayer configuration. Its rapid adsorption kinetics and resilience to heat sterilization underscore its reusability, making it a viable natural alternative to chemical disinfectants. Further research should focus on scaling this method to real wastewater treatment applications to validate its functionality in real-world conditions. © 2024 Society of Chemical Industry (SCI).

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在固定床反应器中使用经热处理的堇青石作为细菌吸附剂去除合成废水中的大肠杆菌和粪肠球菌

背景为了寻求创新的废水处理解决方案，本研究调查了使用热处理过的堇青石（TP）作为吸附剂去除合成废水中的大肠杆菌和粪肠球菌的情况。目的是利用 TP 的抗菌特性，探索氯基消毒剂的天然替代品。用两种粒度（G1：0.25-0.6 毫米；G2：1.40-2.36 毫米）的热塑性硫化弹性体填满色谱柱，并按三种不同配置（CA1、CA2 和 CA3）排列，以评估其细菌去除效率、动力学行为和干热灭菌后的再利用潜力。结果CA3 色谱柱配置的热塑性硫化弹性体多层排列，细菌去除效率最高，对大肠杆菌的去除率达到 99.1%，对粪肠球菌的去除率达到 98.1%。动力学实验表明，大多数细菌的吸附发生在最初的 3 分钟内，而大肠杆菌则需要 10 分钟才能达到最大去除率。TP 的抗菌效果在重复使用两次后仍保持在 90% 以上。此外，干热灭菌允许重复使用 TP，每次重复使用后，粪肠球菌的去除率都很稳定，而大肠杆菌的去除率则略有下降。其快速的吸附动力学和对热消毒的适应性突出了它的可重复使用性，使其成为化学消毒剂的一种可行的天然替代品。进一步的研究应侧重于将这种方法推广到实际的废水处理应用中，以验证其在实际条件下的功能。© 2024 化学工业学会（SCI）。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of chemical technology and biotechnology 工程技术-工程：化工

CiteScore

7.00

自引率

5.90%

发文量

268

审稿时长

1.7 months

期刊介绍： Journal of Chemical Technology and Biotechnology(JCTB) is an international, inter-disciplinary peer-reviewed journal concerned with the application of scientific discoveries and advancements in chemical and biological technology that aim towards economically and environmentally sustainable industrial processes.