Polyaluminium chloride dosing effects on coagulation performance: case study, Barekese, Ghana

Alum, the predominant coagulant in conventional drinking water treatment schemes, has various disadvantages including the production of large volumes of sludge, lowering water pH (requiring pH adjustment using lime), limited coagulation pH range of 6.5 to 8.0, etc. At the Barekese Water Treatment Pl...

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Autores principales:	Samuel Owusu Nti, Richard Buamah, Janet Atebiya
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	coagulant dose coagulation mixing speed polyaluminium chloride polyelectrolyte Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/b1b5bbde4b164df08cf295721941382d
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spelling	oai:doaj.org-article:b1b5bbde4b164df08cf295721941382d2021-11-05T21:16:54ZPolyaluminium chloride dosing effects on coagulation performance: case study, Barekese, Ghana1751-231X10.2166/wpt.2021.069https://doaj.org/article/b1b5bbde4b164df08cf295721941382d2021-10-01T00:00:00Zhttp://wpt.iwaponline.com/content/16/4/1215https://doaj.org/toc/1751-231XAlum, the predominant coagulant in conventional drinking water treatment schemes, has various disadvantages including the production of large volumes of sludge, lowering water pH (requiring pH adjustment using lime), limited coagulation pH range of 6.5 to 8.0, etc. At the Barekese Water Treatment Plant in Ghana, an alternative, the polyelectrolyte – polyaluminium chloride (PAC) is also used in coagulation but limited information is available on the operating conditions required to achieve better performance than alum-based coagulation. The aim of this study was to determine the optimal coagulant dose, mixing speed and operating pH for enhanced performance in water treatment. The effects on the treatment process of three different sets of mixing speed pairs – 180/40, 180/25 and 150/25 revolutions per minute (fast/slow) – in a pH range of 6.5 to 8.0 were investigated. The mixing speed and PAC dose yielding the best coagulation were 150/25 rpm and 15 mg/L respectively. The optimal pH range for PAC coagulation performance was 7.5 to 8.0. HIGHLIGHTS The coagulation process in conventional water treatment could be enhanced and the ensuing water pH decline reduced appreciably by applying the right dosage of polyaluminium chloride and appropriate process conditions of pH, fluid mixing speed matrix and residence time.; Application of polyaluminium chloride under the recommended process conditions produces relatively better quality treated water than alum application.;Samuel Owusu NtiRichard BuamahJanet AtebiyaIWA Publishingarticlecoagulant dosecoagulationmixing speedpolyaluminium chloridepolyelectrolyteEnvironmental technology. Sanitary engineeringTD1-1066ENWater Practice and Technology, Vol 16, Iss 4, Pp 1215-1223 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	coagulant dose coagulation mixing speed polyaluminium chloride polyelectrolyte Environmental technology. Sanitary engineering TD1-1066
spellingShingle	coagulant dose coagulation mixing speed polyaluminium chloride polyelectrolyte Environmental technology. Sanitary engineering TD1-1066 Samuel Owusu Nti Richard Buamah Janet Atebiya Polyaluminium chloride dosing effects on coagulation performance: case study, Barekese, Ghana
description	Alum, the predominant coagulant in conventional drinking water treatment schemes, has various disadvantages including the production of large volumes of sludge, lowering water pH (requiring pH adjustment using lime), limited coagulation pH range of 6.5 to 8.0, etc. At the Barekese Water Treatment Plant in Ghana, an alternative, the polyelectrolyte – polyaluminium chloride (PAC) is also used in coagulation but limited information is available on the operating conditions required to achieve better performance than alum-based coagulation. The aim of this study was to determine the optimal coagulant dose, mixing speed and operating pH for enhanced performance in water treatment. The effects on the treatment process of three different sets of mixing speed pairs – 180/40, 180/25 and 150/25 revolutions per minute (fast/slow) – in a pH range of 6.5 to 8.0 were investigated. The mixing speed and PAC dose yielding the best coagulation were 150/25 rpm and 15 mg/L respectively. The optimal pH range for PAC coagulation performance was 7.5 to 8.0. HIGHLIGHTS The coagulation process in conventional water treatment could be enhanced and the ensuing water pH decline reduced appreciably by applying the right dosage of polyaluminium chloride and appropriate process conditions of pH, fluid mixing speed matrix and residence time.; Application of polyaluminium chloride under the recommended process conditions produces relatively better quality treated water than alum application.;
format	article
author	Samuel Owusu Nti Richard Buamah Janet Atebiya
author_facet	Samuel Owusu Nti Richard Buamah Janet Atebiya
author_sort	Samuel Owusu Nti
title	Polyaluminium chloride dosing effects on coagulation performance: case study, Barekese, Ghana
title_short	Polyaluminium chloride dosing effects on coagulation performance: case study, Barekese, Ghana
title_full	Polyaluminium chloride dosing effects on coagulation performance: case study, Barekese, Ghana
title_fullStr	Polyaluminium chloride dosing effects on coagulation performance: case study, Barekese, Ghana
title_full_unstemmed	Polyaluminium chloride dosing effects on coagulation performance: case study, Barekese, Ghana
title_sort	polyaluminium chloride dosing effects on coagulation performance: case study, barekese, ghana
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/b1b5bbde4b164df08cf295721941382d
work_keys_str_mv	AT samuelowusunti polyaluminiumchloridedosingeffectsoncoagulationperformancecasestudybarekeseghana AT richardbuamah polyaluminiumchloridedosingeffectsoncoagulationperformancecasestudybarekeseghana AT janetatebiya polyaluminiumchloridedosingeffectsoncoagulationperformancecasestudybarekeseghana
_version_	1718444002164867072

Polyaluminium chloride dosing effects on coagulation performance: case study, Barekese, Ghana

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