Study on Flow Distribution Pattern and Conductivity of Porous Media in Bioretention Cells

In order to evaluate the long-term performance of bioretention cell (BRC), a study was undertaken to assess the flow distribution and conductivity. Despite initial conductivity of the original medium being the common predictor of hydraulic performance, most of the BRCs are affected by conductivity v...

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Autores principales:	Yajun Wang, Yunmei Si, Sheng Yang, Rajendra Prasad Singh
Formato:	article
Lenguaje:	EN
Publicado:	Taylor & Francis Group 2021
Materias:	bioretention cell flow distribution microbial behaviour conductivity numerical simulation tracer test Biotechnology TP248.13-248.65
Acceso en línea:	https://doaj.org/article/181d96f49cfe4c4782790e0423131c06
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spelling	oai:doaj.org-article:181d96f49cfe4c4782790e0423131c062021-11-11T14:23:43ZStudy on Flow Distribution Pattern and Conductivity of Porous Media in Bioretention Cells2165-59792165-598710.1080/21655979.2021.1997131https://doaj.org/article/181d96f49cfe4c4782790e0423131c062021-11-01T00:00:00Zhttp://dx.doi.org/10.1080/21655979.2021.1997131https://doaj.org/toc/2165-5979https://doaj.org/toc/2165-5987In order to evaluate the long-term performance of bioretention cell (BRC), a study was undertaken to assess the flow distribution and conductivity. Despite initial conductivity of the original medium being the common predictor of hydraulic performance, most of the BRCs are affected by conductivity variations during actual operation. This happen due to the fact that microbial behavior plays an important role in the conductivity variations. This linkage may occur when bacteria as inert colloids transports between particles and biodegrades dissolved pollutants, either promoting or retarding flow distribution and conductivity in BRC. Flow distribution was determined by numerical simulation and tracer test, the correlation between conductivity and flow distribution was revealed by conductivity experiment coupled with flow distribution analysis. Results revealed a non-uniform flow distribution in BRC and seepage flow in submerged zone was virtually impossible push flow. Conductivity had an inversely proportional relationship with hydraulic efficiency where hydraulic efficiency reached the highest value (0.297) under a low hydraulic conductivity (0.000107 m/s, approximately K/Kini = 0.79). Primary cause of hydraulic capacity reduction was the initial permeability decrease due to medium structure changes. Results revealed a sharp upward trend followed by a slight decrease, and then, stabilized to a stable infiltration stage. Permeation process of sewage influent was similar to the one of potable water where the permeability reduced to 0.000102 m/s after 450 h and declined continuously. Thus, it is clear that flow distribution and conductivity in bioretention must be estimated more accurately on a microscopic scale.Yajun WangYunmei SiSheng YangRajendra Prasad SinghTaylor & Francis Grouparticlebioretention cellflow distributionmicrobial behaviourconductivitynumerical simulationtracer testBiotechnologyTP248.13-248.65ENBioengineered, Vol 0, Iss 0 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	bioretention cell flow distribution microbial behaviour conductivity numerical simulation tracer test Biotechnology TP248.13-248.65
spellingShingle	bioretention cell flow distribution microbial behaviour conductivity numerical simulation tracer test Biotechnology TP248.13-248.65 Yajun Wang Yunmei Si Sheng Yang Rajendra Prasad Singh Study on Flow Distribution Pattern and Conductivity of Porous Media in Bioretention Cells
description	In order to evaluate the long-term performance of bioretention cell (BRC), a study was undertaken to assess the flow distribution and conductivity. Despite initial conductivity of the original medium being the common predictor of hydraulic performance, most of the BRCs are affected by conductivity variations during actual operation. This happen due to the fact that microbial behavior plays an important role in the conductivity variations. This linkage may occur when bacteria as inert colloids transports between particles and biodegrades dissolved pollutants, either promoting or retarding flow distribution and conductivity in BRC. Flow distribution was determined by numerical simulation and tracer test, the correlation between conductivity and flow distribution was revealed by conductivity experiment coupled with flow distribution analysis. Results revealed a non-uniform flow distribution in BRC and seepage flow in submerged zone was virtually impossible push flow. Conductivity had an inversely proportional relationship with hydraulic efficiency where hydraulic efficiency reached the highest value (0.297) under a low hydraulic conductivity (0.000107 m/s, approximately K/Kini = 0.79). Primary cause of hydraulic capacity reduction was the initial permeability decrease due to medium structure changes. Results revealed a sharp upward trend followed by a slight decrease, and then, stabilized to a stable infiltration stage. Permeation process of sewage influent was similar to the one of potable water where the permeability reduced to 0.000102 m/s after 450 h and declined continuously. Thus, it is clear that flow distribution and conductivity in bioretention must be estimated more accurately on a microscopic scale.
format	article
author	Yajun Wang Yunmei Si Sheng Yang Rajendra Prasad Singh
author_facet	Yajun Wang Yunmei Si Sheng Yang Rajendra Prasad Singh
author_sort	Yajun Wang
title	Study on Flow Distribution Pattern and Conductivity of Porous Media in Bioretention Cells
title_short	Study on Flow Distribution Pattern and Conductivity of Porous Media in Bioretention Cells
title_full	Study on Flow Distribution Pattern and Conductivity of Porous Media in Bioretention Cells
title_fullStr	Study on Flow Distribution Pattern and Conductivity of Porous Media in Bioretention Cells
title_full_unstemmed	Study on Flow Distribution Pattern and Conductivity of Porous Media in Bioretention Cells
title_sort	study on flow distribution pattern and conductivity of porous media in bioretention cells
publisher	Taylor & Francis Group
publishDate	2021
url	https://doaj.org/article/181d96f49cfe4c4782790e0423131c06
work_keys_str_mv	AT yajunwang studyonflowdistributionpatternandconductivityofporousmediainbioretentioncells AT yunmeisi studyonflowdistributionpatternandconductivityofporousmediainbioretentioncells AT shengyang studyonflowdistributionpatternandconductivityofporousmediainbioretentioncells AT rajendraprasadsingh studyonflowdistributionpatternandconductivityofporousmediainbioretentioncells
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Study on Flow Distribution Pattern and Conductivity of Porous Media in Bioretention Cells

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