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...
Guardado en:
Autores principales: | , , |
---|---|
Formato: | article |
Lenguaje: | EN |
Publicado: |
IWA Publishing
2021
|
Materias: | |
Acceso en línea: | https://doaj.org/article/b1b5bbde4b164df08cf295721941382d |
Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
id |
oai:doaj.org-article:b1b5bbde4b164df08cf295721941382d |
---|---|
record_format |
dspace |
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 |