Journal of Environmental Conservation Engineering
Online ISSN : 1882-8590
Print ISSN : 0388-9459
ISSN-L : 0388-9459
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Volume 39, Issue 11
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  • Influence of Water Velocity on Sludge Accumulation in a Primary Treatment Tank of On-site Wastewater Systems
    Yosuke TABATA, Ken NAKANISHI, Jun NAKAJIMA
    2010 Volume 39 Issue 11 Pages 681-687
    Published: November 20, 2010
    Released on J-STAGE: November 01, 2011
    DOIhttps://doi.org/10.5956/jriet.39.681
    JOURNAL FREE ACCESS
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    In this study, the relationship between outflow of settled sludge and water velocity in a primary treatment tank of on-site wastewater systems (johkasou) was examined. In the experiment, settled sludge outflowed easily when the height of settled sludge increased to a certain value. Water velocity (simulated by computational fluid dynamics (CFD) agreed well with the velocity measured by an acoustic Doppler velocimeter (ADV) . The water velocity on the surface of settled sludge was relatively fast when the sludge was outflowed, and affected on outflow (the total outflow quantity) of the settled sludge. To prevent outflow of settled sludge, the distance from the lower end of the inlet baffle to the surface of the settled sludge must be kept greater than 30 cm. Therefore, the results suggest that the sludge would be stored until its thickness increases to the difference between the water depth and 70cm.
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