E2.09 Maltos 2018 ReNUWIt Annual Meeting Poster

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Abstract/Contents

Abstract: Conventional activated sludge (CAS) is a simple and low-cost technology that utilizes microorganisms to remove organics and nutrients from wastewater. Because of the operational and cost benefits of CAS, it is implemented by more than 70% of wastewater treatment plants (WWTPs) in the United States. A major problem with these systems occurs during the settling process where biosolids (floc) are removed from the effluent by gravity in clarifiers. A long settling process results in longer hydraulic retention time, lower productivity, higher pumping cost, and higher concentration of solids escaping the clarifier (Figure 1A). Poorly settling floc is common due to the design of the clarifiers, which continuously recycles both good and bad microorganisms, perpetuating poor settling activated sludge. In order to manage poor settling biosolids, additional clarifiers can be used in WWTPs; however, most utilities do not have excess clarifiers on standby and would need to construct new clarifiers, which is expensive and may not be possible for landlocked WWTPs with no space for expansion. Thus, a method for increasing the separation rate of activated sludge from the effluent is needed.

Type of resource	other
Date created	May 2018

Subject	Re-inventing the Nation’s Urban Water Infrastructure
Subject	ReNUWIt
Subject	E2.09
Subject	Efficient Engineered Systems
Subject	Energy and resource recovery
Subject	Mines Park
Subject	Golden
Subject	Colorado
Subject	activated sludge
Subject	bacteria
Subject	sludge

Related Publication	Maltos, R. A., Holloway, R. W., & Cath, T. Y. (2018). Novel Hydraulic Selection Technology for the Improvement of Sludge Setting and Aerobic Granular Sludge Startup. Paper presented at the Proceedings of the Water Environment Federation. https://doi.org/10.2175/193864718825136152
Location	https://purl.stanford.edu/dj381wk8188

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Preferred Citation: Maltos, R. A., Hall, C., Nieczkoski, E., Holloway, R. W., & Cath, T. Y. (2018). E2.09 Maltos 2018 ReNUWIt Annual Meeting Poster. Stanford Digital Repository. Available at: https://purl.stanford.edu/dj381wk8188

Re-inventing the Nation's Urban Water Infrastructure (ReNUWIt)

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