SEDIMENTATION CHARACTERISTICS OF PARTICULATE MATTERS IN RUNOFF DETENTION TANK VIA CFD METHOD

WANG Jian-long; QIN Mei-na; HUANG Tao; TU Nan-nan

doi:10.13205/j.hjgc.202112007

Volume 39 Issue 12

Mar. 2022

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WANG Jian-long, QIN Mei-na, HUANG Tao, TU Nan-nan. SEDIMENTATION CHARACTERISTICS OF PARTICULATE MATTERS IN RUNOFF DETENTION TANK VIA CFD METHOD[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(12): 44-50. doi: 10.13205/j.hjgc.202112007

Citation:

WANG Jian-long, QIN Mei-na, HUANG Tao, TU Nan-nan. SEDIMENTATION CHARACTERISTICS OF PARTICULATE MATTERS IN RUNOFF DETENTION TANK VIA CFD METHOD[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(12): 44-50. doi: 10.13205/j.hjgc.202112007

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SEDIMENTATION CHARACTERISTICS OF PARTICULATE MATTERS IN RUNOFF DETENTION TANK VIA CFD METHOD

doi: 10.13205/j.hjgc.202112007

1. Key Laboratory of Urban Stormwater System and Water Environment, Beijing University of Civil Engineering and Architecture, Beijing 100044, China;
2. Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control,Beijing University of Civil Engineering and Architecture, Beijing 100044, China;
3. Beijing Capital Planning Design Engineering Consulting, Beijing 100045, China;
4. Beijing Branch, North China Municipal Engineering Design & Research Institute Co., Ltd, Beijing 100044, China

Received Date: 2020-09-21
Available Online: 2022-03-30
Publish Date: 2022-03-30

Abstract

Abstract

The runoff detention tank plays an important role in peak flow control and combined sewer overflow pollution control, but the sedimentation characteristics of particles in the stormwater runoff detention tank are still lack of systematic study. Using computational fluid dynamics(CFD) simulation technology, the sedimentation characteristics of particles in the runoff detention tank under different structures and different working conditions were systematically studied. The simulation results showed that when the influent velocity increased from 0.276 m/s to 0.553 m/s, the particle removal rate of the detention tank with smooth bottom(typeⅠ), additional baffles(typeⅡ) and energy dissipating holes(type Ⅲ) decreased by 14.90%, 13.89% and 15.32%, respectively. When the particle size of influent increased from 0.075 mm to 0.15 mm, the particle removal rate increased by 9.10%, 62.48% and 36.65% in the detention tank of typeⅠ, typeⅡand type Ⅲ structure, respectively; when the influent particle concentration increased from 1000 mg/L to 2000 mg/L, the particle removal rate increased by 3.60%, 2.84% and 13.30% in the detention tank of typeⅠ, typeⅡ and type Ⅲ structure, respectively. The importance of different influencing factors on the water quality control in the typeⅠdetention tank was in sequence of influent velocity>particle size>influent particle concentration, and that on the water quality control in both the type Ⅱ and type Ⅲ detention tank were in sequence of particle size>influent velocity>influent particle concentration.
- detention tank,
- particulate matter,
- sedimentation,
- computational fluid dynamics(CFD)

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References(23)

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