Adsorption and (induced) desorption of Cd(II) from the corrosion scales of water distribution pipes, following a deliberate contamination event

Intrusion of toxic heavy-metal cations into water-distribution systems (WDS) may cause severe adverse health-effects on large populations, along with an undesirable psychological impact. The corrosion (scale) layer, that invariably develops on the pipes’ inner walls, is capable of adsorbing a signif...

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Autores principales:	Shimon Somer, Noga Fridman-Bishop, Paz Nativ, Avi Ostfeld, Ori Lahav
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	cd(ii) adsorption cd(ii) desorption corrosion scales water distribution systems water terrorism Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506
Acceso en línea:	https://doaj.org/article/5301abd1b5304c6191770df14efbd0d2
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spelling	oai:doaj.org-article:5301abd1b5304c6191770df14efbd0d22021-11-06T07:15:05ZAdsorption and (induced) desorption of Cd(II) from the corrosion scales of water distribution pipes, following a deliberate contamination event1606-97491607-079810.2166/ws.2021.014https://doaj.org/article/5301abd1b5304c6191770df14efbd0d22021-06-01T00:00:00Zhttp://ws.iwaponline.com/content/21/4/1525https://doaj.org/toc/1606-9749https://doaj.org/toc/1607-0798Intrusion of toxic heavy-metal cations into water-distribution systems (WDS) may cause severe adverse health-effects on large populations, along with an undesirable psychological impact. The corrosion (scale) layer, that invariably develops on the pipes’ inner walls, is capable of adsorbing a significant mass of metal-cations and releasing them thereafter via diffusion to the water once operation is resumed, thereby causing a secondary contamination event. To overcome this, the contaminant should be completely removed, in a controlled fashion, from both the aqueous and scale phases, with minimum damage to the pipe's physical stature. This study determined the range of the Cd(II) adsorption capacity of corrosion-scales and quantified alternative treatments for desorbing it, using an assortment of metal water-pipes, extracted from the WDS. Batch, water-recirculation and flow-through experiments were conducted to determine the extent of Cd(II) adsorption and the best way to desorb it. Corrosion-scales showed substantial Cd(II)-absorption capacity (up to 0.75 mg Cd(II)/g scale) with an approximately linear relation between the aqueous Cd(II) concentration and the adsorbed mass. Desorption experiments included dosages of various acids. Sequential rinsing (eight pipe-volumes) by pH3 solution was found to be the best approach, releasing close to ∼100% of the adsorbed Cd(II), with only a minor effect on the pipes’ integrity. HIGHLIGHTS Cd(II) adsorbs on the pipe's scales upon the dissolution of cadmium salts in water.; An adsorption capacity of up to 0.75 mg Cd(II)/g scale was found.; The adsorbed Cd(II) mass has to be removed to prevent a secondary contamination event.; Sequential rinsing by pH3 solutions released ∼100% of Cd(II) without damage to the pipe.;Shimon SomerNoga Fridman-BishopPaz NativAvi OstfeldOri LahavIWA Publishingarticlecd(ii) adsorptioncd(ii) desorptioncorrosion scaleswater distribution systemswater terrorismWater supply for domestic and industrial purposesTD201-500River, lake, and water-supply engineering (General)TC401-506ENWater Supply, Vol 21, Iss 4, Pp 1525-1537 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	cd(ii) adsorption cd(ii) desorption corrosion scales water distribution systems water terrorism Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506
spellingShingle	cd(ii) adsorption cd(ii) desorption corrosion scales water distribution systems water terrorism Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506 Shimon Somer Noga Fridman-Bishop Paz Nativ Avi Ostfeld Ori Lahav Adsorption and (induced) desorption of Cd(II) from the corrosion scales of water distribution pipes, following a deliberate contamination event
description	Intrusion of toxic heavy-metal cations into water-distribution systems (WDS) may cause severe adverse health-effects on large populations, along with an undesirable psychological impact. The corrosion (scale) layer, that invariably develops on the pipes’ inner walls, is capable of adsorbing a significant mass of metal-cations and releasing them thereafter via diffusion to the water once operation is resumed, thereby causing a secondary contamination event. To overcome this, the contaminant should be completely removed, in a controlled fashion, from both the aqueous and scale phases, with minimum damage to the pipe's physical stature. This study determined the range of the Cd(II) adsorption capacity of corrosion-scales and quantified alternative treatments for desorbing it, using an assortment of metal water-pipes, extracted from the WDS. Batch, water-recirculation and flow-through experiments were conducted to determine the extent of Cd(II) adsorption and the best way to desorb it. Corrosion-scales showed substantial Cd(II)-absorption capacity (up to 0.75 mg Cd(II)/g scale) with an approximately linear relation between the aqueous Cd(II) concentration and the adsorbed mass. Desorption experiments included dosages of various acids. Sequential rinsing (eight pipe-volumes) by pH3 solution was found to be the best approach, releasing close to ∼100% of the adsorbed Cd(II), with only a minor effect on the pipes’ integrity. HIGHLIGHTS Cd(II) adsorbs on the pipe's scales upon the dissolution of cadmium salts in water.; An adsorption capacity of up to 0.75 mg Cd(II)/g scale was found.; The adsorbed Cd(II) mass has to be removed to prevent a secondary contamination event.; Sequential rinsing by pH3 solutions released ∼100% of Cd(II) without damage to the pipe.;
format	article
author	Shimon Somer Noga Fridman-Bishop Paz Nativ Avi Ostfeld Ori Lahav
author_facet	Shimon Somer Noga Fridman-Bishop Paz Nativ Avi Ostfeld Ori Lahav
author_sort	Shimon Somer
title	Adsorption and (induced) desorption of Cd(II) from the corrosion scales of water distribution pipes, following a deliberate contamination event
title_short	Adsorption and (induced) desorption of Cd(II) from the corrosion scales of water distribution pipes, following a deliberate contamination event
title_full	Adsorption and (induced) desorption of Cd(II) from the corrosion scales of water distribution pipes, following a deliberate contamination event
title_fullStr	Adsorption and (induced) desorption of Cd(II) from the corrosion scales of water distribution pipes, following a deliberate contamination event
title_full_unstemmed	Adsorption and (induced) desorption of Cd(II) from the corrosion scales of water distribution pipes, following a deliberate contamination event
title_sort	adsorption and (induced) desorption of cd(ii) from the corrosion scales of water distribution pipes, following a deliberate contamination event
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/5301abd1b5304c6191770df14efbd0d2
work_keys_str_mv	AT shimonsomer adsorptionandinduceddesorptionofcdiifromthecorrosionscalesofwaterdistributionpipesfollowingadeliberatecontaminationevent AT nogafridmanbishop adsorptionandinduceddesorptionofcdiifromthecorrosionscalesofwaterdistributionpipesfollowingadeliberatecontaminationevent AT paznativ adsorptionandinduceddesorptionofcdiifromthecorrosionscalesofwaterdistributionpipesfollowingadeliberatecontaminationevent AT aviostfeld adsorptionandinduceddesorptionofcdiifromthecorrosionscalesofwaterdistributionpipesfollowingadeliberatecontaminationevent AT orilahav adsorptionandinduceddesorptionofcdiifromthecorrosionscalesofwaterdistributionpipesfollowingadeliberatecontaminationevent
_version_	1718443793695375360

Adsorption and (induced) desorption of Cd(II) from the corrosion scales of water distribution pipes, following a deliberate contamination event

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