A comparative study of the nutrient status of two reservoirs in southeast Ghana

Ansa-Asare, O.D.; Asante, Kwadwo Ansong

doi:10.1046/j.1440-1770.1998.00074.x

Cited by 15 publications

(9 citation statements)

References 2 publications

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“…Ansa-Asare and Asante (1998) reported that there is a general decrease in the nutrient concentration in the dry season. Of all the nutrients, sulphate had very high concentration followed by phosphate in all the samples.…”

Section: Resultsmentioning

confidence: 99%

Changes in water quality in the Owabi water treatment plant in Ghana

et al. 2014

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The study was conducted on the status of the quality of water from the Owabi water treatment plant that supplies drinking water to Kumasi, a major city in Ghana, to ascertain the change in quality of water from source to point-of-use. Physico-chemical, bacteriological water quality parameters and trace metal concentration of water samples from five different treatment points from the Owabi water treatment plant were investigated. The raw water was moderately hard with high turbidity and colour that exceeds the WHO guideline limits. Nutrient concentrations were of the following order: NH 3 \ NO 2 -\ -NO 3 -\ PO 4 3-\ SO 4 2-and were all below WHO permissible level for drinking water in all the samples at different stages of treatment. Trace metal concentrations of the reservoir were all below WHO limit except chromium (0.06 mg/L) and copper (0.24 mg/L). The bacteriological study showed that the raw water had total coliform (1,766 cfu/100 mL) and faecal coliform (257 cfu/100 mL) that exceeded the WHO standard limits, rendering it unsafe for domestic purposes without treatment. Colour showed strong positive correlation with turbidity (r = 0.730), TSS (r C 0.922) and alkalinity (0.564) significant at p \ 0.01. The quality of the treated water indicates that colour, turbidity, Cr and Cu levels reduced and fall within the WHO permissible limit for drinking water. Treatment process at the water treatment plant is adjudged to be good.

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Section: Resultsmentioning

confidence: 99%

Changes in water quality in the Owabi water treatment plant in Ghana

et al. 2014

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“…Climatic conditions are tropical with wet season having moderate rainfall which peak in June and September with dry season spanning between December and March. Previous reports on Weija Reservoir include its physico-chemical characteristics, fish composition, fisheries and socio-economic status (Ameka et al, 2000;Ansa-Asare & Asante, 1998;Dassah & Abban, 1979;Abban, 1979;Balarin, 1988;…”

Section: Study Areamentioning

confidence: 99%

Potential fish yield and Physico-chemical characteristics of Weija reservoir in Ghana

Quarcoopome

Asmah

2018

Ghana J. Agric. Sci

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The Weija Reservoir is an important resource for the production and supply of potable water, fish and irrigation services in Ghana. The study was undertaken to estimate the potential fish yield of Weija Reservoir to provide information for planning and management and to address the challenges of paucity of information on the potential fish yield of reservoirs in Ghana. Fish and water samples were collected monthly between March and December 2011 at Intake, Machigeni and Galilea sampling stations in the Weija Reservoir. Based on the physico-chemical parameters evaluated, the Weija Reservoir is adequate for fish survival, growth and production despite indications of low levels of organic contamination. Estimates of mean fish yield and potential fish yield for the three (3) stations based on morpho-edaphic index indicate that Machigeni has the highest yields followed by Intake and Galilea due to differences in anthropogenic activities, contamination and species richness. Monthly variations in potential fish yield and physico-chemical parameters follow similar pattern at all three sites with Machigeni recording the highest values and Intake the lowest. For the section of the reservoir sampled, the mean potential fish yield was 68.27 kg ha-1 while the mean fish yield was 229.45 t yr-1 giving indication of declining fish yield compared to the earlier life of the reservoir which is attributable to physico-chemical, environmental, biological and anthropogenic changes. For successful fisheries management, regular monitoring of the fish species as well as control of fish habitat and environmental degradation are recommended.

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“…It was constructed in 1981 on the Volta River system mainly to provide hydroelectricity to supplement power generated from the Volta River dam. It has a total surface area of 38 km 2 , maximal depth of 15 m with a mean depth of 5 m, and a mean annual flow 1183 m 3 s -1 (Ansa-Asare and Ansong- 94 Asante, 1998;Quarcoopome et al, 2011). The Kpong Reservoir apart from power generation is also used for drinking water production, irrigation, recreation and also well known for its fisheries, especially the tilapias.…”

Section: Study Areamentioning

confidence: 99%

“…1). It has a surface area of about 38 km 2 , a mean depth of 5 m and a mean annual flow of 54.2 m 3 s -1 (AnsaAsare and Ansong- Asante, 1998, Asante et al, 2008. The Weija Reservoir was built in 1977 on the Densu River system.…”

Section: Study Areamentioning

confidence: 99%

Cyanobacteria and microcystin contamination in untreated and treated drinking water in Ghana

Addico¹,

Hardege²,

Kohoutek³

et al. 2017

Adv Ocean Limnol

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Although cyanobacterial blooms and cyanotoxins represent a worldwide-occurring phenomenon, there are large differences among different countries in cyanotoxin-related human health risk assessment, management practices and policies. While national standards, guideline values and detailed regulatory frameworks for effective management of cyanotoxin risks have been implemented in many industrialized countries, the extent of cyanobacteria occurrence and cyanotoxin contamination in certain geographical regions is underreported and not very well understood. Such regions include major parts of tropical West and Central Africa, a region constisting of more than 25 countries occupying an area of 12 million km 2 , with a total population of 500 milion people. Only few studies focusing on cyanotoxin occurrence in this region have been published so far, and reports dealing specifically with cyanotoxin contamination in drinking water are extremely scarce. In this study, we report seasonal data on cyanobacteria and microcystin (MC) contamination in drinking water reservoirs and adjacent treatment plants located in Ghana, West Africa. During January-June 2005, concentrations of MCs were monitored in four treatment plants supplying drinking water to major metropolitan areas in Ghana: the treatment plants Barekese and Owabi, which serve Kumasi Metropolitan Area, and the plants Kpong and Weija, providing water for Accra-Tema Metropolitan Area. HPLC analyses showed that 65% samples of raw water at the intake of the treatment plants contained intracellular MCs (maximal detected concentration was 8.73 µg L -1 ), whereas dissolved toxins were detected in 33% of the samples. Significant reduction of cyanobacterial cell counts and MC concentrations was achieved during the entire monitoring period by the applied conventional water treatment methods (alum flocculation, sedimentation, rapid sand filtration and chlorination), and MC concentration in the final treated water never exceeded 1 µg L -1 (WHO guideline limit for MC-LR in drinking water). However, cyanobacterial cells (93-3,055 cell mL -1 ) were frequently found in the final treated water and intracellular MCs were detected in 17% of the samples (maximal concentration 0.61 µg L -1 ), while dissolved MCs were present in 14% of the final treated water samples (maximal concentration 0.81 µg L -1 ). It indicates a borderline efficiency of the water treatment, thus MC concentrations in drinking water might exceed the WHO guideline limit if the treatment efficiency gets compromised. In addition, MC concentrations found in the raw water might represent significant human health risks for people living in areas with only a limited access to the treated or underground drinking water.

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A comparative study of the nutrient status of two reservoirs in southeast Ghana

Cited by 15 publications

References 2 publications

Changes in water quality in the Owabi water treatment plant in Ghana

Changes in water quality in the Owabi water treatment plant in Ghana

Potential fish yield and Physico-chemical characteristics of Weija reservoir in Ghana

Cyanobacteria and microcystin contamination in untreated and treated drinking water in Ghana

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