Experimental study on the selection of common adsorption substrates for extensive green roofs (EGRs)

Adsorption substrate in the substrate layer of an extensive green roof (EGR) is one of the most important factors affecting rainwater retention and pollution interception capacity. However, the contact time between runoff and adsorption substrate is extremely short in actual rainfall, and adsorption...

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Autores principales:	Chen Xu, Zaohong Liu, Guanjun Cai, Jian Zhan
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	adsorption extensive green roof retention and interception effect substrate layer Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/f47e2a39ba8e4117ba33b7cc51d1236b
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spelling	oai:doaj.org-article:f47e2a39ba8e4117ba33b7cc51d1236b2021-11-06T10:48:17ZExperimental study on the selection of common adsorption substrates for extensive green roofs (EGRs)0273-12231996-973210.2166/wst.2021.012https://doaj.org/article/f47e2a39ba8e4117ba33b7cc51d1236b2021-02-01T00:00:00Zhttp://wst.iwaponline.com/content/83/4/961https://doaj.org/toc/0273-1223https://doaj.org/toc/1996-9732Adsorption substrate in the substrate layer of an extensive green roof (EGR) is one of the most important factors affecting rainwater retention and pollution interception capacity. However, the contact time between runoff and adsorption substrate is extremely short in actual rainfall, and adsorption substrate cannot show fully rainwater retention and pollution interception capacity. So, selection of adsorption substrate based on its physical properties and theoretical adsorption capacity is unreliable. In this study, eight commonly-used adsorption substrate experimental devices are constructed with the same configuration. The delayed outflow time and runoff reduction rate of each device, along with event measurement concentration (EMC), average EMC, and cumulative pollutant quantity of SS, ammonium (NH4+), nitrate (NO3−), total nitrogen (TN), and total phosphorus (TP) in each device outflow under nine simulated rainfall events are measured and evaluated. The results indicate that vermiculite has a significant interception effect on NH4+ and TP with the advantages of low bulk density, high porosity, low cost, and a good rainfall runoff retention capacity under torrential rain and downpour events. In future practical engineering and related studies of EGR, attention should be paid to ameliorating the deficiencies of the adsorption substrates and optimizing their synergistic effects when combined with nutrient substrates.Chen XuZaohong LiuGuanjun CaiJian ZhanIWA Publishingarticleadsorptionextensive green roofretention and interception effectsubstrate layerEnvironmental technology. Sanitary engineeringTD1-1066ENWater Science and Technology, Vol 83, Iss 4, Pp 961-974 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	adsorption extensive green roof retention and interception effect substrate layer Environmental technology. Sanitary engineering TD1-1066
spellingShingle	adsorption extensive green roof retention and interception effect substrate layer Environmental technology. Sanitary engineering TD1-1066 Chen Xu Zaohong Liu Guanjun Cai Jian Zhan Experimental study on the selection of common adsorption substrates for extensive green roofs (EGRs)
description	Adsorption substrate in the substrate layer of an extensive green roof (EGR) is one of the most important factors affecting rainwater retention and pollution interception capacity. However, the contact time between runoff and adsorption substrate is extremely short in actual rainfall, and adsorption substrate cannot show fully rainwater retention and pollution interception capacity. So, selection of adsorption substrate based on its physical properties and theoretical adsorption capacity is unreliable. In this study, eight commonly-used adsorption substrate experimental devices are constructed with the same configuration. The delayed outflow time and runoff reduction rate of each device, along with event measurement concentration (EMC), average EMC, and cumulative pollutant quantity of SS, ammonium (NH4+), nitrate (NO3−), total nitrogen (TN), and total phosphorus (TP) in each device outflow under nine simulated rainfall events are measured and evaluated. The results indicate that vermiculite has a significant interception effect on NH4+ and TP with the advantages of low bulk density, high porosity, low cost, and a good rainfall runoff retention capacity under torrential rain and downpour events. In future practical engineering and related studies of EGR, attention should be paid to ameliorating the deficiencies of the adsorption substrates and optimizing their synergistic effects when combined with nutrient substrates.
format	article
author	Chen Xu Zaohong Liu Guanjun Cai Jian Zhan
author_facet	Chen Xu Zaohong Liu Guanjun Cai Jian Zhan
author_sort	Chen Xu
title	Experimental study on the selection of common adsorption substrates for extensive green roofs (EGRs)
title_short	Experimental study on the selection of common adsorption substrates for extensive green roofs (EGRs)
title_full	Experimental study on the selection of common adsorption substrates for extensive green roofs (EGRs)
title_fullStr	Experimental study on the selection of common adsorption substrates for extensive green roofs (EGRs)
title_full_unstemmed	Experimental study on the selection of common adsorption substrates for extensive green roofs (EGRs)
title_sort	experimental study on the selection of common adsorption substrates for extensive green roofs (egrs)
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/f47e2a39ba8e4117ba33b7cc51d1236b
work_keys_str_mv	AT chenxu experimentalstudyontheselectionofcommonadsorptionsubstratesforextensivegreenroofsegrs AT zaohongliu experimentalstudyontheselectionofcommonadsorptionsubstratesforextensivegreenroofsegrs AT guanjuncai experimentalstudyontheselectionofcommonadsorptionsubstratesforextensivegreenroofsegrs AT jianzhan experimentalstudyontheselectionofcommonadsorptionsubstratesforextensivegreenroofsegrs
_version_	1718443831185113088

Experimental study on the selection of common adsorption substrates for extensive green roofs (EGRs)

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