Effect of the type and concentration of multivalent cations on the durability of polymeric media for degrading quorum sensing signaling molecules in membrane bioreactors

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

Water Research Pub Date : 2025-04-12 DOI:10.1016/j.watres.2025.123637

Hosung Lee , Sojin Min , Dowon Chae , Chanyoung Kim , Hyun-Suk Oh , Kibaek Lee , Jaewoo Lee , Kwang-Ho Choo , Chung-Hak Lee , Pyung-Kyu Park

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Abstract

Quorum quenching (QQ) techniques have been applied to membrane bioreactors (MBRs) to inhibit biofouling in the form of polymeric media entrapping QQ bacteria, called QQ media. However, concerns about the durability of QQ media during long-term operation have been raised. To address this, the degree of cross-linking in QQ media was enhanced by either increasing the Ca²⁺ concentration in the 1st cross-linking solution or changing the type of multivalent metal cation in the 2nd cross-linking solution. The QQ beads fabricated under these conditions were compared to those of previously developed conditions in terms of physical durability and biological QQ efficiency. The improved QQ beads demonstrated greater durability, as confirmed by measurements of hardness, swelling ratio, and alginate leakage. In addition, they showed higher QQ efficiency, which was verified through bioassay and analysis of internal microorganisms. The results indicated optimal performance when the 1st cross-linking solution had 16 % w/v CaCl₂, or when the 2nd cross-linking solution contained Al³⁺ as the metal cation, with 0.1 M Al₂(SO₄)₃. Finally, the lifespan of the improved QQ beads was estimated using an experimentally derived formula, suggesting that the lifespan of 16 % w/v CaCl₂ and 0.1 M Al₂(SO₄)₃ QQ beads indicated an increase by factors of 2.71 and 3.35, respectively, when compared with the conventional QQ beads.

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多价阳离子的类型和浓度对膜生物反应器中降解法定人数感应信号分子的聚合物介质耐久性的影响

定量淬灭（QQ）技术已被应用于膜生物反应器（MBR），以夹带 QQ 细菌的聚合物介质（称为 QQ 介质）的形式抑制生物污垢。然而，人们对 QQ 介质在长期运行过程中的耐用性表示担忧。为了解决这个问题，通过增加第一交联溶液中 Ca²⁺ 的浓度或改变第二交联溶液中多价金属阳离子的类型，提高了 QQ 介质的交联度。将在这些条件下制造的 QQ 珠与之前开发的条件下制造的 QQ 珠在物理耐久性和生物 QQ 效率方面进行了比较。通过测量硬度、膨胀率和藻酸盐渗漏，证实改进后的 QQ 珠具有更高的耐用性。此外，它们还显示出更高的 QQ 效率，这一点通过生物测定和内部微生物分析得到了验证。结果表明，当第一种交联溶液含有 16% w/v CaCl2，或第二种交联溶液含有 Al3+ 作为金属阳离子（0.1 M Al2(SO4)3）时，QQ 的性能最佳。最后，利用实验得出的公式估算了改进型 QQ 珠的寿命，结果表明与传统 QQ 珠相比，16% w/v CaCl2 和 0.1 M Al2(SO4)3 QQ 珠的寿命分别增加了 2.71 和 3.35 倍。

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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.