首页|污泥负荷对反硝化过程动力学和亚硝酸盐积累能力的探究

污泥负荷对反硝化过程动力学和亚硝酸盐积累能力的探究

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为提高短程反硝化耦合厌氧氨氧化(PD/Anammox)工艺处理负荷,探究负荷对反硝化中氮转化途径的影响.在批次试验中探究不同污泥负荷对反硝化过程中动力学和亚硝酸盐积累能力的影响,并通过改变连续试验中的污泥负荷,共同探究其对短程反硝化过程的影响.在批次试验中,随着污泥负荷增高,NO2--N及NO3--N的反应速率都降低,但NO2--N积累能力增强,亚硝酸盐积累率(NAR)最高达72.47%;在低污泥负荷下反应加快,同时也促进了NO2--N还原速率,NAR降低至56.46%.在连续试验中,通过缩短HRT增大污泥负荷,反应器短程反硝化能力提升,NAR从26.86%提升至45.62%,污泥活性增加,反硝化活性试验中NAR达90.24%.污泥颗粒化结构明显,粒径和胞外聚合物含量增加.短期批次和长期连续试验结果表明,提升污泥负荷是提高反硝化过程中短程反硝化能力的有效策略.
Effect of sludge loading on kinetics and nitrite accumulation capacity of denitrification process
To enhance the treatment capacity of partial denitrification coupled with Anammox(PD/Anam-mox)process,the impact of loading on nitrogen conversion pathway during denitrification process was investigat-ed.Batch experiments were conducted to explore the effects of different sludge loadings on kinetics and nitrite accumulation capacity during denitrification.Additionally,by altering the sludge loadings in long-term continu-ous experiments,the influence of it on partial denitrification process was verified.In batch experiments,higher loadings resulted in lower reaction rates of NO2--N and NO3--N and higher NO2--N accumulation capacity,with the nitrite accumulation rate(NAR)reaching a maximum of 72.47%.Under lower sludge loading,the reactions were accelerated,the NO2--N reduction rate was increased and the NAR was reduced to 56.46%.In continuous experiments,increasing the sludge loading by shortening HRT improved the reactor's partial denitrification ca-pacity,rose the NAR from 26.86%to 45.62%,the sludge activity was increased,and in the denitrification activi-ty test,the NAR reached 90.24%.The sludge exhibited a more granular structure,with increased particle size and extracellular polymeric substance content.The results of the short-term batch and long-term continuous ex-periments showed that,increasing sludge loading is an effective strategy to enhance the partial denitrification ca-pacity during the denitrification process.

sludge loadingpartial denitrificationNO2--N accumulationreaction kinetics

李林曦、李晓、吴伟鹏、林钰婷、蒋碧馨、张子锟

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厦门峻鸿环境固废处置有限公司,福建 厦门 361101

厦门大学 环境与生态学院,福建 厦门 361102

污泥负荷 短程反硝化 NO2--N积累 反应动力学

2024

工业用水与废水
东化工程科技股份有限公司

工业用水与废水

CSTPCD
影响因子:0.649
ISSN:1009-2455
年,卷(期):2024.55(5)