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A self-sustaining effect induced by iron sulfide generation and reuse in pyrite-woodchip mixotrophic bioretention systems: An experimental and modeling study
Water Research ( IF 11.4 ) Pub Date : 2024-08-23 , DOI: 10.1016/j.watres.2024.122311
Yan Yang 1 , Jixing Li 2 , Zheng Kong 3 , Jingchen Ma 4 , Yu Shen 2 , Haiyuan Ma 5 , Yi Yan 6 , Kang Dan 7 , Hongxiang Chai 5
Affiliation  

Dual electron donor bioretention systems have emerged as a popular strategy to enhance dissolved nitrogen removal from stormwater runoff. Pyrite-woodchip mixotrophic bioretention systems showed a promoted and stabilized removal of dissolved nutrients under complex rainfall conditions, but the sulfate reduction process that can induce iron sulfide generation and reuse was overlooked. In this study, experiments and models were applied to investigate the effects of filler configuration and dissolved organic carbon (DOC) dissolution rate on treatment performance and iron sulfide generation in pyrite-woodchip bioretention systems. Key parameters govern that DOC dissolution and microbe-mediated processes were obtained by experiments. The water quality models that integrate one-dimensional constant flow, sorption and microbial transformation kinetics were used to predict the performance of bioretention systems. Results showed that the mixotrophic bioretention system with woodchip mixed in the vadose zone and pyrite in the saturated zone achieves a better performance in both nitrogen removal efficiency and by-product control. Comparably, woodchip and pyrite mixed in the saturated zone could encounter a high secondary pollution risk. The sensitivity coefficients of oxic/anoxic DOC dissolution rates to total nitrogen removal are 0.36 and -2.43 respectively. Iron sulfide generation was affected by DOC distribution and the competition between heterotrophic denitrifiers, autotrophic denitrifiers, and sulfate-reducing bacteria (SRB). DOC accumulation has an antagonistic effect on iron production and sulfate reduction. Extra DOC accumulation favors sulfate reduction while high DOC concentration inhibits pyrite-based denitrification and reduces Fe(III) production. The recycling of iron sulfide can improve the robustness and sustainability of bioretention systems.

中文翻译:


黄铁矿-木片混合营养生物滞留系统中硫化铁的生成和再利用引起的自我维持效应:实验和建模研究



双电子供体生物滞留系统已成为增强雨水径流中溶解氮去除的流行策略。黄铁矿-木片混合营养生物滞留系统在复杂的降雨条件下表现出促进和稳定地去除溶解养分的作用,但忽略了可诱导硫化铁生成和再利用的硫酸盐还原过程。在本研究中,应用实验和模型研究了填料配置和溶解有机碳(DOC)溶解速率对黄铁矿-木片生物滞留系统的处理性能和硫化铁生成的影响。通过实验获得控制 DOC 溶解和微生物介导过程的关键参数。集成一维恒流、吸附和微生物转化动力学的水质模型用于预测生物滞留系统的性能。结果表明,包气区混合木屑、饱和区混合黄铁矿的混合营养生物截留系统在脱氮效率和副产物控制方面均取得了较好的效果。相比之下,木片和黄铁矿在饱和区混合存在较高的二次污染风险。好氧/缺氧DOC溶解速率对总氮去除的敏感系数分别为0.36和-2.43。硫化铁的生成受到 DOC 分布以及异养反硝化菌、自养反硝化菌和硫酸盐还原菌 (SRB) 之间竞争的影响。 DOC积累对铁的产生和硫酸盐的还原具有拮抗作用。额外的 DOC 积累有利于硫酸盐还原,而高 DOC 浓度会抑制基于黄铁矿的反硝化并减少 Fe(III) 的产生。 硫化铁的回收可以提高生物滞留系统的稳健性和可持续性。
更新日期:2024-08-23
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