A novel fluidized-bed reactor with multi-stage oxygen distribution: Application to toxic and recalcitrant wastewater

IF 7.6 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Environmental Pollution Pub Date : 2025-02-15 DOI:10.1016/j.envpol.2025.125869

Haoling Li , Zhuocheng Wei , Jia Wan , Gengrui Wei , Bin Zhang , Xianghong Guan , Chaohai Wei , Shuang Zhu , Haizhen Wu

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Abstract

The development of efficient and low-energy consumption processes and reactors for the treatment of highly concentrated, recalcitrant, and toxic organic wastewater has been a significant challenge. This study presents a novel fluidized-bed reactor, equipped with multi-stage oxygen distribution zones, designed to enhance detoxification, carbon removal, and nitrogen removal. Experimental investigations using coking wastewater demonstrated that the multi-stage oxygen fluidized-bed reactor achieved COD and TN removal rates of 86.9 ± 1.2% and 93.1 ± 2.7% at a hydraulic retention time (HRT) of 70 h, significantly outperforming the traditional aerobic fluidized-bed reactor (84.4 ± 1.6% and 41.8 ± 2.2%). The multi-stage oxygen distribution in the reactor facilitated the enrichment of various functional microorganisms in activated sludge, leading to the formation of a highly diverse microbial community. This community simultaneously performed organic degradation, nitrification, and denitrification, enhancing the COD degradation and TN removal efficiency in coking wastewater. The fluidized-bed reactor with multi-stage oxygen distribution exhibited performance in treating coking wastewater, offering valuable insights for the design of reactors intended for bio-processing toxic, recalcitrant, and high-concentration industrial wastewater.

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来源期刊

Environmental Pollution 环境科学-环境科学

CiteScore

16.00

自引率

6.70%

发文量

2082

审稿时长

2.9 months

期刊介绍： Environmental Pollution is an international peer-reviewed journal that publishes high-quality research papers and review articles covering all aspects of environmental pollution and its impacts on ecosystems and human health. Subject areas include, but are not limited to: • Sources and occurrences of pollutants that are clearly defined and measured in environmental compartments, food and food-related items, and human bodies; • Interlinks between contaminant exposure and biological, ecological, and human health effects, including those of climate change; • Contaminants of emerging concerns (including but not limited to antibiotic resistant microorganisms or genes, microplastics/nanoplastics, electronic wastes, light, and noise) and/or their biological, ecological, or human health effects; • Laboratory and field studies on the remediation/mitigation of environmental pollution via new techniques and with clear links to biological, ecological, or human health effects; • Modeling of pollution processes, patterns, or trends that is of clear environmental and/or human health interest; • New techniques that measure and examine environmental occurrences, transport, behavior, and effects of pollutants within the environment or the laboratory, provided that they can be clearly used to address problems within regional or global environmental compartments.