Light wavelength modulation and emerging contaminant stress: Deciphering adaptive responses in microalgal-bacterial granular sludge systems

IF 6.7 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of water process engineering Pub Date : 2025-07-21 DOI:10.1016/j.jwpe.2025.108358

Xiaohan Li , Shanshan Hou , Shujuan Meng , Bihui Niu , Guoliang Ma , Yuanli Gao , Yunzong Lamu , Linyan Yang , Bin Ji , Meng Zhang

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Abstract

The escalating global water crisis, intensified by antibiotic contamination, presents urgent threats to ecological security and public health. Microalgal-bacterial granular sludge (MBGS) emerges as a sustainable wastewater treatment technology with inherent capabilities for phototrophic energy utilization. This study systematically investigated the treatment efficiency of MBGS and the evolution of its microbial community under different light wavelengths and the stress of emerging contaminants, amoxicillin (AMX) and ciprofloxacin (CF). Experimental results reveal that red light irradiation (620–650 nm) significantly enhances photosynthetic performance through elevated chlorophyll accumulation (26.1 mg/g) and dissolved oxygen production (21.7 mg/L). Simultaneously, it stimulates extracellular polymeric substance (EPS) biosynthesis (144.5 mg/g), thereby improving system stability and contaminant removal efficacy. In contrast, blue light conditions result in lower processing efficiency compared to alternative wavelengths. Furthermore, under high-concentration antibiotic conditions, MBGS exposed to red light showed superior contaminant removal capacity due to the adsorption and shielding effect of EPS on antibiotic toxicity. Additionally, microbial community analysis reveals that red light significantly increases the abundance of Cyanobacteria (52.6 % abundance), AMX favors the proliferation of Cyanobacteria, while CF promotes the growth of Acidobacteriota. These findings establish red light optimization as an effective strategy for enhancing MBGS performance in antibiotic-laden wastewater treatment, providing crucial theoretical foundations for process optimization in sustainable water remediation.

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光波长调制和新出现的污染物压力：解读微藻-细菌颗粒污泥系统中的适应性反应

全球水危机不断升级，抗生素污染加剧，对生态安全和公众健康构成紧迫威胁。微藻-细菌颗粒污泥（MBGS）是一种可持续的污水处理技术，具有固有的光营养能量利用能力。本研究系统研究了不同光波下MBGS的处理效率及其微生物群落的演变，以及新出现的污染物阿莫西林（AMX）和环丙沙星（CF）的胁迫。实验结果表明，红光照射（620 ~ 650 nm）可通过提高叶绿素积累（26.1 mg/g）和溶解氧产量（21.7 mg/L）显著提高光合性能。同时，刺激细胞外聚合物（EPS）生物合成（144.5 mg/g），从而提高系统稳定性和污染物去除效果。相比之下，与其他波长相比，蓝光条件导致较低的处理效率。此外，在高浓度抗生素条件下，由于EPS对抗生素毒性的吸附和屏蔽作用，暴露于红光下的MBGS表现出优异的污染物去除能力。此外，微生物群落分析显示，红光显著增加了蓝藻的丰度（52.6%丰度），AMX有利于蓝藻的增殖，而CF促进酸杆菌的生长。这些研究结果表明红光优化是提高MBGS在含抗生素废水处理中的性能的有效策略，为可持续水修复的工艺优化提供了重要的理论基础。

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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