Bacterial Contamination Levels of Lettuce Irrigated with Waste Water in the Kumasi Metropolis

Consumption of vegetables contaminated with pathogenic micro organisms, particularly, in areas where urban waste water is used to irrigate vegetable crops is suspected to be a factor in outbreaks of some public health diseases. The microbiological quality of lettuce on three farms where waste water is used in the Kumasi Metropolis in Ghana was therefore studied for their Total colifoms, faecal coliforms, enterococci, E. coli and Salmonella CFU levels using standard methods. Total coliforms on the lettuce varied from 4.93×104CFU to 6.17×104CFU. Faecal coliforms ranged from 3.48×103CFU to 4.66×104CFU and E. coli 2.98×103CFU to 3.86×104CFU. Samonella and enterococci levels ranged from 2.50×102CFU to 2.72×102CFU and 0.68×100CFU to 2.05×100CFU respectively. In most cases the highest bacterial contamination was associated with lettuce grown at Atonsu and the lowest was at Karikari farms located within the Kumasi Metropolis. The differences in total colifom counts at the two locations were significant (P < 0.001). Differences in bacteria counts for faecal colifoms (P < 0.000) and E. coli (P < 0.000) were significantly higher than counts associated with the other bacteria from all the three farms. In general, bacterial counts on farm lettuce exceeded the recommended World Health Organization (WHO) and International Commission on Microbiological Specifications for Food (ICMSF) standards of 103. Wastewater use on farms therefore, could be the main contributor to lettuce contamination and outbreak of communicable diseases. Education on use of effective de-contamination methods before eating will help reduce the risk associated with the consumption of such contaminated vegetables. Key Words: lettuce, contamination, bacteria, Kumasi, Ghana

Quality Determination of Groundwater for Drinking at Nkawkaw in the Eastern Region of Ghana

The physical, trace element and microbiology of groundwater randomly collected from four boreholes namely (BH3, BH5, BH103 and BH105) at Nkawkaw in the Eastern Region of Ghana were examined by comparing it to the Ghana standards for drinking water using various standard methods of analysis and the results were compared to the Ghana standards in 2011. The microbiological data indicated that the water from all the boreholes surveyed was safe for drinking since no thermotolerant colifom bacteria were detected in them. Although the results revealed evidence of minimum physical variations in terms of colour (0.67 Pt. Co - 61.0 Pt. Co), conductivity (819µs/cm - 1052µs/cm) and turbidity (0.59 NTU - 23.5 NTU), as well as relatively higher manganese (0.038mg/L - 0.638mg/L) and aluminum (0.064 - 0.479mg/L) concentrations in some boreholes, the values obtained were generally acceptable when compared to the Ghana water Company’s Standards and WHO Guideline values. The boreholes with high levels of manganese were all located in the same area which signified a possible rock mineral and groundwater interaction.  Additionally, nitrogen concentration was found to be within the acceptable limits according to Ghana Water Company’s Standard even though at p<0.05, both forms of nitrogen (ammonium and nitrate), showed significant difference (p<0.00094) among their corresponding means (0.058, 0.054, 0.072 and 0.060) mg/L in BH3, BH5, BH103 and BH105 respectively. Frequent monitoring programmes and education are recommended to ensure implementation of safe water plans for the Nkawkaw area where tapping of groundwater from richer aquifer reserves appears unavoidable.   Keywords: Groundwater, Nkawkaw, Borehole, Ghana Water Company, Bacteria, Physico-chemical, Traced Metal

Traced Metals and Nutrients in Mosquito Breeding Sites at the Obuasi Municipality of Ashanti Region in Ghana

A survey was conducted in the Obuasi Municipality to assess the impact of some trace metals and nutrients on mosquito breeding sites from 15 randomly selected communities. The water samples, collected fortnightly for eight months, were analyzed using spectrophotometry and other standard laboratory protocols at the AngloGold Ashanti Environmental Quality Assurance Laboratory. The results on trace metals, and nutrients did not reveal any significant pattern of attendant pollution that would influence the breeding patterns of mosquitoes. However, the trace metals ranged from 0.12±0.01mg/L - 13.42±0.01mg/L and 0.01±0.01mg/L - 0.30±0.01mg/L for Fe and Pb respectively in the waters whilst As and Zn were not detected. For the nutrients - nitrate values which were > 1 ranged from 2mg/L – > 40mg/L. Sulphate levels varied between < 20mg/L and > 200mg/L and were above the EPA Maximun Permissible Limit of 1.5 mg/L  for polluted  natural water bodies. There was no definite pattern in the concentrations of phosphates which varied between 0.1mg/L and 1.5mg/L in the waters. It is apparent that under rising temperature conditions of climate change, the mosquito’s habitat may be highly favoured for adaptation and prolific breeding in the tropics and this further creates the opportunity for research partners to get actively involved in finding integrated control measures to counteract the life cycle of the pest. Keywords: Anglogold Ashanti, Obuasi Municipality, Traced Metal Analysis, Mosquito Breeding Water

Effects of Different Solid Loading Rates of Faecal Sludge on the Dewatering Performance of Unplanted Filter Bed.

The aim of this study was to investigate which Solid Loading Rate (SLR) of faecal sludge will best improve the dewatering performance of selected sand with particle sizes range of (? 0.1 ? 0.5) mm raised on bench scale filter beds. Public toilet sludge  and septage collected from suction trucks discharging at Dompoase stabilisation  ponds in Kumasi , Ghana, mixed in the ratio of 1:1, 1:2 and 1:3 by volume representing SLR1, SLR2 and SLR3 respectively, were used for the dewatering. Percolate volume was measured every 24 hour. The faecal sludge of SLR1, SLR2 and SLR3 dewatered at average dewatering times of 7, 5 and 4 days respectively. Removal efficiencies of the different solid loading rates though very high for TS, SS, TVS, COD, DCOD, NH3-N, did not show any significant difference. Organic matter build up in the top 10cm of the filter bed was least in SLR3. Again SLR3 showed the highest potential for annual generation of biosolids at 438, 421 and 379 (kg/m2 year) for SL3, SLR2 and SLR1 respectively. Therefore SLR3 of faecal sludge is recommended for dewatering on the selected filter bed. Key words: Faecal sludge, solid loading rate, dewatering time, filter bed, percolate

Numerical Analysis of the Effect of Subgrid Variability in a Physically Based Hydrological Model on Runoff, Soil Moisture, and Slope Stability

In coarse resolution hydrological modeling, we face the problem of subgrid variability, the effects of which are difficult to express and are often hidden in the parameterization and calibration. We present a numerical experiment with the physically based hydrological model ParFlow-CLM with which we quantify the effect of subgrid heterogeneities in headwater catchments within the cell size typically used for regional hydrological applications. We simulate homogeneous domains and domains with subgrid heterogeneities in topography or soil thickness for two climates and soil types. The presence of side slope is the main error source, leading to large underestimation of runoff, and marginally also of evapotranspiration. The spatial distribution of soil saturation in the presence of subgrid variability in topography also leads to underestimation of landslide risk. Soil thickness is the second influential subgrid property, affecting soil moisture distribution and surface runoff formation. Results are consistent for the climates and the soil types considered. The topographic wetness index approach is tested as a way to downscale soil moisture simulations within the domain. Although this method is successful in reproducing some spatial variability and patterns, it fails when the coarse grid mean soil saturation is inaccurate or subgrid topography does not represent subsurface flow paths accurately. We conclude that ignoring subgrid variability in topography and soil thickness in coarse-scale hydrological models may lead locally to underestimation of runoff and slope instability. Users of such models should be aware of these biases and consider ways to include subgrid effects in coarse-scale hydrological predictions.ISSN:0043-1397ISSN:1944-797

Sacred Groves as Potential Ecotourism Sites at Tolon and Diare in Northern Region, Ghana

Purpose: Relic plant communities commonly referred as “sacred groves” in Ghana and comparatively anywhere are ecologically, genetically important resources indigenously protected as “abodes of gods or ancestral habitats” through traditional or religious beliefs and taboos. This study mainly evaluated the potentials of sacred groves for development as tourist sites at Tolon and Diare in the Northern Region of Ghana. Research methodology: Data was collected using semi structured interview questionnaire aided by vegetation survey, observational field walk through the Jaagbo and Tindangung Sacred Groves to screen natural features of the destinations and determine its potential for ecotourism. Findings: Potential areas for visitor amateurism such as the wonderful baobab tree, crocodile pond, misty stone bird sanctuary, were identified in both groves. About 220 different species of plants were identified in the entire groves. The study further discovered that with effective management measures in place, the ecotourism potentials of these sacred groves will optimize if developed to attract visitors and generate income for sustainable socio-economic development of the adjoining communities in northern Ghana. Limitations: Although the target population was above 200 people, relatively small sample size (≤ 36%), could be chosen since the opinion leaders considered the groves as sacred and were less prepared to divulge information about them. Islam and Christianity rather counteracted certain beliefs of the traditional people who adopted local measures to enhance sustainability of these sites for ecotourism functions. Contribution: The study advocates the adoption of bylaws to promote sustainable management of the sacred groves for sustainable benefits. Keywords: Jaagbo, Tindangung, Sacred grove, Crocodile pond, Bird sanctuary, Traditional bylaws, Land use pla