Effect of Outlet Configurations on the Removal of Fine Noncohesive Sediment by Vortex Settling Basin at Small River Abstraction Works

Kiringu, Kuria; Basson, G. R.

doi:10.1061/(asce)ir.1943-4774.0001620

Cited by 1 publication

(1 citation statement)

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“…A hydrodynamic separator is one of the options for sediment control in stormwater treatment before releasing to natural water bodies. The main mechanism for sediment removal is to generate a flow field in a chamber that is favorable for the sediment to settle before exit (Andoh & Saul 2003;Yu & Lee 2009;Kiringu & Basson 2021). These devices separate sediments and floating from stormwater through vortex principles caused by swirling flow fields, and therefore have no moving parts which requires low maintenance.…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

Evaluation on the performance of a swirling-type hydrodynamic separator using physical and numerical models

Weng,

Qian,

Zhu

et al. 2024

Water Science &Amp; Technology

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Hydrodynamic separators are commonly used to control the total suspended solid concentration in stormwater before being discharged to natural water bodies. The separator studied in this paper, featuring a swirling flow generated by tangential inlet and outlet connections, was analyzed for its sediment removal efficiency in relation to sediment and flow rates. For the separator studied in this paper, the numerical model showed that the flow field was favorable for the sediments to gather at the center and settle. A higher flow rate or a smaller sediment diameter corresponded to a lower removal rate and vice versa. The dimension improvement for increasing the sediment removal rate was also studied. It was found that increasing the diameter of the separator showed a higher sediment removal rate compared with corresponding increase in the height of the separator. A dimensionless parameter J was proposed to assess the sediment removal rate of a separator, which may be used for designing and optimizing such a device. The removal rate is positively correlated with the J value. When the J value reaches 0.5 or above, the sediment removal rate exceeds 80%, which is a good initial target value for designing this type of separator.

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Section: Graphical Abstract Introductionmentioning

confidence: 99%