Sidestream RAS Fermentation for Stable Bio-P Combined with Short Cut Nitrogen Removal in an A/B Process

Ferguson, Lindsey; Campolong, Cody; Klaus, Stephanie; Wilson, Chris; Wett, Bernhard; Murthy, Sudhir; Bott, Charles

doi:10.2175/193864718824940466

Cited by 2 publications

(2 citation statements)

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“…8 Another suggestion is to perform side-stream fermentation using the diverted organics and return it to the B-stage. 9 However, such a proposal significantly reduces the amount of organics recovered. Hence, maximizing P removal shall be considered as an additional objective for the A-stage process.…”

Section: Introductionmentioning

confidence: 99%

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Going Beyond Carbon Redirection: Integrating Operational Conditions to Maximize Carbon and Phosphorus Removal in the A-Stage Process

AlSayed,

Soliman,

Hendy

et al. 2024

ACS EST Water

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This study explores the use of the alternating activated adsorption (AAA) system to achieve a balance between sustaining high COD redirection toward recovery streams and high effluent quality, in terms of COD and phosphorus removal. It investigates a novel integrative operational approach that includes hydraulic retention time (HRT), solid retention time (SRT), dissolved oxygen (DO) concentration, and effluent recirculation. Results indicated that integrating long HRT (4 h) with limited DO concentration (below 0.5 mgO 2 /L) effectively controlled COD oxidation while allowing for high COD redirection. Effluent recirculation further improved solid capture and COD redirection, while short SRT limited the associated oxidation through hydrolysis. Notably, this resulted in achieving COD redirection and removal above 50 and 80%, respectively. Meanwhile, such conditions achieved biophosphorus removal efficiencies as high as 55−60%, which surpasses other A-stage systems. To achieve higher phosphorus removal, enhanced biological phosphorus removal (EBPR) should be induced under conditions that slightly diminish the COD redirection and, to a lesser extent, the COD removal efficiency. Significantly, this research suggests a novel approach to designing and operating the A-stage process, particularly AAA, acknowledging its holistic role in fostering sustainable and energy-efficient wastewater treatment.

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Section: Introductionmentioning

confidence: 99%

“…As a result, WWTPs use chemical precipitation to remove phosphorus, which is costly and environmentally unsustainable . Another suggestion is to perform side-stream fermentation using the diverted organics and return it to the B-stage . However, such a proposal significantly reduces the amount of organics recovered.…”

Section: Introductionmentioning

confidence: 99%