Simulation and optimization of hydraulic performance of small baffled subsurface flow constructed wetland

The water body inside the constructed wetland is affected by various factors, and the flow state is relatively complicated. There will always be a certain degree of low velocity area and rapid outflow phenomenon, which makes part of the space in the wetland unable to be effectively used. Based on Co...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Rongzhen Wang, Lirong Xu, Xiangxi Xu, Zhenghe Xu, Xin Cong
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	baffle setting fluent hydraulic performance modeling substrate laying Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/eedee5ddc9e1472a9d2e76b0395f31e3
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:eedee5ddc9e1472a9d2e76b0395f31e3
record_format	dspace
spelling	oai:doaj.org-article:eedee5ddc9e1472a9d2e76b0395f31e32021-11-06T11:16:31ZSimulation and optimization of hydraulic performance of small baffled subsurface flow constructed wetland0273-12231996-973210.2166/wst.2021.249https://doaj.org/article/eedee5ddc9e1472a9d2e76b0395f31e32021-08-01T00:00:00Zhttp://wst.iwaponline.com/content/84/3/632https://doaj.org/toc/0273-1223https://doaj.org/toc/1996-9732The water body inside the constructed wetland is affected by various factors, and the flow state is relatively complicated. There will always be a certain degree of low velocity area and rapid outflow phenomenon, which makes part of the space in the wetland unable to be effectively used. Based on Computational Fluid Dynamics (CFD) technology, this paper uses Fluent's porous media model and discrete phase model to establish a hydrodynamic model of up and down baffled subsurface flow constructed wetland system. The internal flow field of the wetland is simulated, and the hydraulic performance of different baffle settings and substrate laying methods in the wetland is systematically evaluated. The results show that when the number of baffles is the same, the hydraulic efficiency is higher when the first baffle is located on the lower part of the substrate. Compared with the position of the baffle, the increase in the number of baffles does not significantly improve the hydraulic efficiency of the constructed wetland. The substrate layer thickness ratio has a significant effect on the two parameters of the variance of the hydraulic residence time distribution (σ2) and the flow divergence (σ02). By increasing the thickness of the middle substrate, the low flow rate phenomenon caused by the small porosity substrate area of the upper layer and the rapid outflow phenomenon of the lower substrate can be improved to a certain extent, the utilization efficiency of the middle substrate layer is improved, and the hydraulic performance is increased. The research results are of great significance for improving the utilization of wetland space and ensuring its efficient decontamination and purification function. HIGHLIGHTS The hydraulic performance of constructed wetland is affected by baffle setting and substrate laying.; The first baffle is located at the lower part of the substrate with higher hydraulic efficiency.; The layer thickness ratio of the substrate mainly affects the hydraulic residence time distribution and the flow divergence.;Rongzhen WangLirong XuXiangxi XuZhenghe XuXin CongIWA Publishingarticlebaffle settingfluenthydraulic performancemodelingsubstrate layingEnvironmental technology. Sanitary engineeringTD1-1066ENWater Science and Technology, Vol 84, Iss 3, Pp 632-643 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	baffle setting fluent hydraulic performance modeling substrate laying Environmental technology. Sanitary engineering TD1-1066
spellingShingle	baffle setting fluent hydraulic performance modeling substrate laying Environmental technology. Sanitary engineering TD1-1066 Rongzhen Wang Lirong Xu Xiangxi Xu Zhenghe Xu Xin Cong Simulation and optimization of hydraulic performance of small baffled subsurface flow constructed wetland
description	The water body inside the constructed wetland is affected by various factors, and the flow state is relatively complicated. There will always be a certain degree of low velocity area and rapid outflow phenomenon, which makes part of the space in the wetland unable to be effectively used. Based on Computational Fluid Dynamics (CFD) technology, this paper uses Fluent's porous media model and discrete phase model to establish a hydrodynamic model of up and down baffled subsurface flow constructed wetland system. The internal flow field of the wetland is simulated, and the hydraulic performance of different baffle settings and substrate laying methods in the wetland is systematically evaluated. The results show that when the number of baffles is the same, the hydraulic efficiency is higher when the first baffle is located on the lower part of the substrate. Compared with the position of the baffle, the increase in the number of baffles does not significantly improve the hydraulic efficiency of the constructed wetland. The substrate layer thickness ratio has a significant effect on the two parameters of the variance of the hydraulic residence time distribution (σ2) and the flow divergence (σ02). By increasing the thickness of the middle substrate, the low flow rate phenomenon caused by the small porosity substrate area of the upper layer and the rapid outflow phenomenon of the lower substrate can be improved to a certain extent, the utilization efficiency of the middle substrate layer is improved, and the hydraulic performance is increased. The research results are of great significance for improving the utilization of wetland space and ensuring its efficient decontamination and purification function. HIGHLIGHTS The hydraulic performance of constructed wetland is affected by baffle setting and substrate laying.; The first baffle is located at the lower part of the substrate with higher hydraulic efficiency.; The layer thickness ratio of the substrate mainly affects the hydraulic residence time distribution and the flow divergence.;
format	article
author	Rongzhen Wang Lirong Xu Xiangxi Xu Zhenghe Xu Xin Cong
author_facet	Rongzhen Wang Lirong Xu Xiangxi Xu Zhenghe Xu Xin Cong
author_sort	Rongzhen Wang
title	Simulation and optimization of hydraulic performance of small baffled subsurface flow constructed wetland
title_short	Simulation and optimization of hydraulic performance of small baffled subsurface flow constructed wetland
title_full	Simulation and optimization of hydraulic performance of small baffled subsurface flow constructed wetland
title_fullStr	Simulation and optimization of hydraulic performance of small baffled subsurface flow constructed wetland
title_full_unstemmed	Simulation and optimization of hydraulic performance of small baffled subsurface flow constructed wetland
title_sort	simulation and optimization of hydraulic performance of small baffled subsurface flow constructed wetland
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/eedee5ddc9e1472a9d2e76b0395f31e3
work_keys_str_mv	AT rongzhenwang simulationandoptimizationofhydraulicperformanceofsmallbaffledsubsurfaceflowconstructedwetland AT lirongxu simulationandoptimizationofhydraulicperformanceofsmallbaffledsubsurfaceflowconstructedwetland AT xiangxixu simulationandoptimizationofhydraulicperformanceofsmallbaffledsubsurfaceflowconstructedwetland AT zhenghexu simulationandoptimizationofhydraulicperformanceofsmallbaffledsubsurfaceflowconstructedwetland AT xincong simulationandoptimizationofhydraulicperformanceofsmallbaffledsubsurfaceflowconstructedwetland
_version_	1718443768515919872

Simulation and optimization of hydraulic performance of small baffled subsurface flow constructed wetland

Ejemplares similares