Advanced nitrogen removal from semiconductor wastewater under fluoride stress via continuous plug-flow anaerobic/oxic/anoxic process: Performance, microbial evolution and mechanisms

IF 6.7 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of water process engineering Pub Date : 2025-07-16 DOI:10.1016/j.jwpe.2025.108315

Shuo Chen , Wenyi Dong , Fupeng Wang , Huaguang Liu , Zilong Hou , Yanchen Li , Pingyan Zhou , Ruzhen Huang , Hongjie Wang

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Abstract

The presence of fluoride ions (F⁻) in nitrogen-containing wastewater from the semiconductor industry poses significant challenges to biological wastewater treatment plants (WWTPs) receiving semiconductor effluents, particularly for the widely used activated sludge process. This study firstly investigated the application of the novel continuous plug-flow sludge dual-reflux anaerobic/oxic/anoxic (AOA) process for treating semiconductor wastewater under F⁻ stress through long-term operation. Key findings include the system's ability to maintain high nitrogen removal efficiency under varying hydraulic retention times (HRT) and F⁻ concentrations (up to 25 mg/L). The average effluent total inorganic nitrogen (TIN) concentration was 5.0 mg/L with a removal efficiency of 73 % under F⁻ concentration of 22.8 ± 3.0 mg/L. A slight removal effect on F attributed to adsorption and co-precipitation mechanisms with activated sludge was achieved. Results of nitrogen balance calculations indicated simultaneous nitrification and denitrification (SND), endogenous denitrification (END) and exogenous denitrification (EXD) collectively contributed to highly efficient nitrogen removal. Microbial community analysis revealed the abundance of typical glycogen accumulating organisms (GAOs) Candidatus_Competibacter (4.7 % to 6.0 %) were selectively enriched under F⁻ stress, thereby enhancing the system's denitrification capacity. These findings advance our understanding of the resilience and adaptability of biological wastewater treatment systems in treating semiconductor wastewater.

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连续塞流厌氧/氧/缺氧工艺对氟胁迫下半导体废水的深度脱氮：性能、微生物进化及机理

半导体工业含氮废水中氟离子（F−）的存在对接收半导体废水的生物废水处理厂（WWTPs）提出了重大挑战，特别是对于广泛使用的活性污泥法。本研究首先通过长期运行，研究了新型连续塞流污泥双回流厌氧/氧/缺氧（AOA）工艺在F−胁迫下处理半导体废水中的应用。主要发现包括该系统在不同的水力停留时间（HRT）和F -浓度（高达25 mg/L）下保持高氮去除效率的能力。F−浓度为22.8±3.0 mg/L时，出水总无机氮（TIN）平均浓度为5.0 mg/L，去除率为73%。由于活性污泥的吸附和共沉淀机制，对F有轻微的去除效果。氮平衡计算结果表明，同时硝化和反硝化（SND）、内源反硝化（END）和外源反硝化（EXD）共同促进了高效脱氮。微生物群落分析表明，F−胁迫下，典型的糖原积累菌（GAOs） Candidatus_Competibacter丰度（4.7% ~ 6.0%）选择性富集，从而增强了系统的反硝化能力。这些发现促进了我们对生物废水处理系统在处理半导体废水中的弹性和适应性的理解。

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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