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
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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
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