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Influence of HRT and carbon source on the enhancement of nutrient removal in an Anaerobic-Oxic-Anoxic (AOA) system
Environmental Technology ( IF 2.2 ) Pub Date : 2021-02-16 , DOI: 10.1080/09593330.2021.1882586
Thayse Nathalie Ferro 1 , Karina Querne de Carvalho 2 , Mateus Xavier de Lima 3 , Ana Cláudia Barana 4 , Cristiane Kreutz 5 , Olga Regina Gauza 6 , Fernando Hermes Passig 6
Affiliation  

ABSTRACT

The eutrophication and increase in toxicity promoted by the continuous or abundant supply of nutrients in water bodies threaten the safety of drinking water and human health. In this regard, this study proposes the investigation of wastewater treatment focusing on the simultaneous removal of nitrogen and phosphorus in the anaerobic–oxic–anoxic (AOA) system. The AOA system was operated in three different stages to verify the influence of the external carbon source addition in the anoxic reactor and the reduction of hydraulic retention time (HRT) in the anaerobic and oxic reactors for nutrient removal optimization. Results showed that the best performance of the AOA system on nutrient removal was obtained in Stage 3, with the reduction of the HRT in the anaerobic and oxic reactors (HRT = 4 h) while maintaining HRT of 6.4 h in the anoxic reactor with no addition of the external carbon source. Under these conditions, the average removal efficiencies reached 98% for Chemical Oxygen Demand (COD), 88% for Total Ammonia Nitrogen (TAN), 81% for Total Kjeldahl Nitrogen (TKN), and 70% for Total Phosphorus (TP). The results also demonstrate that the highest phosphorus removal efficiency was achieved in the anoxic reactor, thus indicating the occurrence of denitrifying phosphorous removal by Denitrifying Phosphate Accumulating Organisms (DNPAOs). This configuration was efficient regarding the simultaneous removal of nitrogen and phosphorus; besides, the advantages of this system include robust configuration and excellent performance on the nutrient removal.



中文翻译:

HRT 和碳源对促进厌氧-好氧-缺氧 (AOA) 系统中养分去除的影响

摘要

水体中持续或丰富的营养物质供应所促进的富营养化和毒性增加,威胁着饮用水的安全和人类健康。在这方面,本研究提出了以厌氧-好氧-缺氧(AOA)系统中同时去除氮和磷为重点的废水处理研究。AOA 系统在三个不同阶段运行,以验证在缺氧反应器中添加外部碳源的影响以及在厌氧和好氧反应器中减少水力停留时间 (HRT) 以优化营养去除。结果表明,AOA 系统在营养物去除方面的最佳性能在第 3 阶段获得,厌氧和好氧反应器中的 HRT 降低(HRT = 4 h),同时保持 HRT 为 6。在没有添加外部碳源的缺氧反应器中 4 小时。在这些条件下,化学需氧量 (COD) 的平均去除效率达到 98%,总氨氮 (TAN) 达到 88%,总凯氏定氮 (TKN) 达到 81%,总磷 (TP) 达到 70%。结果还表明,在缺氧反应器中实现了最高的除磷效率,从而表明反硝化磷蓄积生物(DNPAOs)发生了反硝化除磷。这种配置在同时去除氮和磷方面是有效的;此外,该系统的优点包括坚固的配置和出色的营养去除性能。化学需氧量 (COD) 的平均去除效率达到 98%,总氨氮 (TAN) 达到 88%,总凯氏氮 (TKN) 达到 81%,总磷 (TP) 达到 70%。结果还表明,在缺氧反应器中实现了最高的除磷效率,从而表明反硝化磷蓄积生物(DNPAOs)发生了反硝化除磷。这种配置在同时去除氮和磷方面是有效的;此外,该系统的优点包括坚固的配置和出色的营养去除性能。化学需氧量 (COD) 的平均去除效率达到 98%,总氨氮 (TAN) 达到 88%,总凯氏氮 (TKN) 达到 81%,总磷 (TP) 达到 70%。结果还表明,在缺氧反应器中实现了最高的除磷效率,从而表明反硝化磷蓄积生物(DNPAOs)发生了反硝化除磷。这种配置在同时去除氮和磷方面是有效的;此外,该系统的优点包括坚固的配置和出色的营养去除性能。结果还表明,在缺氧反应器中实现了最高的除磷效率,从而表明反硝化磷蓄积生物(DNPAOs)发生了反硝化除磷。这种配置在同时去除氮和磷方面是有效的;此外,该系统的优点包括坚固的配置和出色的营养去除性能。结果还表明,在缺氧反应器中实现了最高的除磷效率,从而表明反硝化磷蓄积生物(DNPAOs)发生了反硝化除磷。这种配置在同时去除氮和磷方面是有效的;此外,该系统的优点包括坚固的配置和出色的营养去除性能。

更新日期:2021-02-16
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