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Article

Comparison of Effluent Suspended Solid Concentrations from Two Types of Rectangular Secondary Clarifiers

Department of Environmental Energy Engineering, Kyonggi University, Suwon 16227, Korea
Academic Editor: Christos S. Akratos
Water 2022, 14(10), 1577; https://doi.org/10.3390/w14101577
Received: 27 March 2022 / Revised: 10 May 2022 / Accepted: 12 May 2022 / Published: 14 May 2022
(This article belongs to the Topic Water Reclamation and Reuse)
Secondary clarifiers play a significant role in the successful operation of activated sludge systems. Because of the restriction of available land, South Korean domestic wastewater treatment plants tend to employ rectangular clarifiers to settle mixed liquor suspended solids (MLSS) for activated sludge systems. A high MLSS concentration must be maintained in the bioreactor to ensure nitrification during winters, and achieve stringent effluent quality. The effluent suspended solid (SS) concentrations of two clarifier types currently being used in South Korea, primary rectangular clarifier-type and Gould Type I secondary clarifiers, were compared using computerized fluid dynamic simulations and hourly secondary effluent suspended solid concentrations. In addition, operational data such as hourly influent flow, daily MLSS concentrations, and sludge volume index were obtained and reviewed. This comparison reveals that the Gould Type I secondary clarifier is resilient to loading variation and produces effluent with a consistently lower suspended solid concentration than the primary rectangular clarifier-type under similar loading conditions and higher loading variations. The results suggest that the existing primary rectangular clarifier-type secondary clarifiers must be converted to Gould Type I. View Full-Text
Keywords: rectangular clarifier; Gould Type I; secondary clarifier rectangular clarifier; Gould Type I; secondary clarifier
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MDPI and ACS Style

Lee, B. Comparison of Effluent Suspended Solid Concentrations from Two Types of Rectangular Secondary Clarifiers. Water 2022, 14, 1577. https://doi.org/10.3390/w14101577

AMA Style

Lee B. Comparison of Effluent Suspended Solid Concentrations from Two Types of Rectangular Secondary Clarifiers. Water. 2022; 14(10):1577. https://doi.org/10.3390/w14101577

Chicago/Turabian Style

Lee, Byonghi. 2022. "Comparison of Effluent Suspended Solid Concentrations from Two Types of Rectangular Secondary Clarifiers" Water 14, no. 10: 1577. https://doi.org/10.3390/w14101577

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