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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| Format: | Article |
| Language: | English |
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IWA Publishing
2021-10-01
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| Series: | Water Practice and Technology |
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| Online Access: | http://wpt.iwaponline.com/content/16/4/1215 |
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| author | Samuel Owusu Nti Richard Buamah Janet Atebiya |
| author_facet | Samuel Owusu Nti Richard Buamah Janet Atebiya |
| author_sort | Samuel Owusu Nti |
| collection | DOAJ |
| 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.; |
| first_indexed | 2024-12-19T03:54:01Z |
| format | Article |
| id | doaj.art-b1b5bbde4b164df08cf295721941382d |
| institution | Directory Open Access Journal |
| issn | 1751-231X |
| language | English |
| last_indexed | 2024-12-19T03:54:01Z |
| publishDate | 2021-10-01 |
| publisher | IWA Publishing |
| record_format | Article |
| series | Water Practice and Technology |
| spelling | doaj.art-b1b5bbde4b164df08cf295721941382d2022-12-21T20:36:51ZengIWA PublishingWater Practice and Technology1751-231X2021-10-011641215122310.2166/wpt.2021.069069Polyaluminium chloride dosing effects on coagulation performance: case study, Barekese, GhanaSamuel Owusu Nti0Richard Buamah1Janet Atebiya2 RWESCK, Department of Civil Engineering, Kwame Nkrumah University of Science and Technology, Kumasi, PMB, Ghana RWESCK, Department of Civil Engineering, Kwame Nkrumah University of Science and Technology, Kumasi, PMB, Ghana RWESCK, Department of Civil Engineering, Kwame Nkrumah University of Science and Technology, Kumasi, PMB, 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 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.;http://wpt.iwaponline.com/content/16/4/1215coagulant dosecoagulationmixing speedpolyaluminium chloridepolyelectrolyte |
| spellingShingle | Samuel Owusu Nti Richard Buamah Janet Atebiya Polyaluminium chloride dosing effects on coagulation performance: case study, Barekese, Ghana Water Practice and Technology coagulant dose coagulation mixing speed polyaluminium chloride polyelectrolyte |
| title | 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_short | Polyaluminium chloride dosing effects on coagulation performance: case study, Barekese, Ghana |
| title_sort | polyaluminium chloride dosing effects on coagulation performance case study barekese ghana |
| topic | coagulant dose coagulation mixing speed polyaluminium chloride polyelectrolyte |
| url | http://wpt.iwaponline.com/content/16/4/1215 |
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