Leveraging feast and famine selection pressure during startup of continuous flow aerobic granulation systems to manage treatment performance,Environmental Science: Water Research & Technology

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Leveraging feast and famine selection pressure during startup of continuous flow aerobic granulation systems to manage treatment performance
Environmental Science: Water Research & Technology ( IF 3.5 ) Pub Date : 2021-07-02 , DOI: 10.1039/d1ew00314c
Zhaohui An ₁ , Charles B. Bott ₂ , Bob Angelotti ₃ , Matt Brooks ₃ , Zhi-Wu Wang ₁

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Hydraulic selection pressure that selectively washes out flocculent microbial sludge has been a conventional approach to drive flocculent systems towards aerobic granulation. Such substantial sludge washout inevitably compromises treatment performance during reactor startup, which is unacceptable in full-scale applications of aerobic granulation technology. This study explored the possible use of feast and famine conditions to increase selection pressure to drive aerobic granulation while avoiding substantial sludge washout during startup. Experimental results demonstrated that continuously returning the sludge in the underflow and overflow of a gravity selector to the feast and famine zones of a plug flow reactor, respectively, can effectively drive a smoother transition from flocculent activated sludge to granular sludge without dramatic sludge concentration and effluent quality decline during reactor startup. In comparison to a more conventional approach with only hydraulic selection pressure, adding the microbial sludge selection afforded through feast and famine conditions offers a novel startup strategy that can better maintain treated water quality by controlling system solids retention time. It is anticipated that the outcome from this study will provide further engineering guidance to promote full-scale applications of continuous flow aerobic granulation technology.

中文翻译：

在连续流好氧制粒系统启动期间利用盛宴和饥荒选择压力来管理处理性能

选择性冲洗絮状微生物污泥的液压选择压力一直是驱动絮凝系统进行需氧造粒的常规方法。在反应器启动期间，这种大量的污泥冲洗不可避免地会影响处理性能，这在好氧造粒技术的全面应用中是不可接受的。本研究探讨了可能使用盛宴和饥荒条件来增加选择压力以驱动好氧造粒，同时避免启动期间大量污泥冲刷。实验结果表明，在重力选择器的底流和溢流中的污泥分别连续返回到活塞流反应器的盛宴区和饥荒区，可以有效地推动从絮状活性污泥到颗粒污泥的更平稳过渡，而不会在反应器启动期间出现污泥浓度和出水质量的急剧下降。与仅使用水力选择压力的更传统方法相比，添加通过盛宴和饥荒条件提供的微生物污泥选择提供了一种新的启动策略，可以通过控制系统固体保留时间更好地保持处理后的水质。预计这项研究的结果将为促进连续流好氧造粒技术的全面应用提供进一步的工程指导。添加通过盛宴和饥荒条件提供的微生物污泥选择提供了一种新的启动策略，可以通过控制系统固体保留时间更好地保持处理后的水质。预计这项研究的结果将为促进连续流好氧造粒技术的全面应用提供进一步的工程指导。添加通过盛宴和饥荒条件提供的微生物污泥选择提供了一种新的启动策略，可以通过控制系统固体保留时间更好地保持处理后的水质。预计这项研究的结果将为促进连续流好氧造粒技术的全面应用提供进一步的工程指导。

更新日期：2021-07-13

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