Water quality assessment in Bangwe Township, Blantyre City, Malawi

This study assessed microbial contamination of water in sources (boreholes and open wells) and selected households in four Malawian villages (situated in Bangwe Township, Blantyre city) by analyzing the presence of faecal coliforms using membrane filtration. Additionally, pH, conductivity and temperature of the water sources were also determined. Conductivity ranged from 150.5 to 1575 μS/cm. About 70% of all water sources were above World Health Organization (WHO) and Malawi Bureau of Standards (MBS) limits for conductivity (indicating salty water in the area). Water temperature ranged from 21.5 to 24.7°C and pH from 5.28 to 6.95 with no significant difference (p > 0.05) for these physical parameters among the sampling points. Water pH was within MBS range while 60% of water sources were below WHO range. Faecal coliform levels exceeding WHO and MBS safe standards were observed in 79% of all samples analysed in this study. Mean household faecal coliform levels were as follows (village (mean)); Nalivata (437 CFU/100 mL), Mpingwe 1 (172 CFU/100 mL), Mpingwe (266 CFU/100 mL) and Salvation Army (15 CFU/100 mL). All mean faecal coliform counts were above WHO (0  CFU/100 mL) and MBS (0 CFU/100 mL) safe values. The results suggest that the quality of water in the villages often fails to meet one or more WHO and MBS recommended safe levels as such, poses a potential risk to the health of those individuals living in such villages. Local and National Governments should therefore target the provision of safe water to such populations. The findings of this study also highlight the need for improved dissemination of good hygienic practices amongst such communities.Key words: Boreholes, drinking water, faecal coliforms, health, pollution

Comparison of plant nutrient levels between compost from Sky loo and Fossa alterna toilets

Recent scholars have highlighted the benefit of harvesting compost from eco-san toilets for application as plant nutrients. However, levels of nutrients in eco-san compost may vary depending on the type of toilet and also the type of top soil in a particular geographical region. This study compared levels of nitrogen, phosphorous, potassium, calcium and sodium between compost from Sky loo and Fossa alterna toilets. Samples were collected from Zimora and Ng’ombe villages in Chikhwawa district, southern Malawi. Statistical analysis using SPSS showed significantly higher levels of nitrogen, calcium and moisture in compost from Fossa alterna toilets than in Sky loo (p < 0.05). However, there were no significant differences in the levels of potassium in the two types of eco-san compost studied. This study has revealed that compost from Fossa alterna is generally a richer source of plant nutrients than that from Sky loo thereby presenting poor, local communities in sub-Saharan Africa with a cheaper alternative to commercial fertilizer.Key words: Eco-san toilets, compost, Malawi, plant nutrients, soil quality

Climate variation based on temperature and solar radiation data over a 29 year period in Lilongwe City, Malawi

Economies that mainly depend on agriculture are to a large extent being negatively impacted by climate change. In this study, temperature and solar radiation data from Chitedze Weather Station, Lilongwe City, Malawi for a 29-year period (1985 to 2013) were assessed for the possibility of climate variation. In addition, the concentration of carbon dioxide over Malawi within the same period as temperature and solar radiation data was assessed for inferences. The highest mean minimum temperature (15.7°C) was recorded in 2010. The highest mean maximum temperature (27.9°C) and solar radiation (21.5 MJm-2day-1) were recorded in 2005. The mean minimum temperature showed an increasing pattern but both mean maximum temperature and solar radiation data showed a lot of variation. There were significant differences (p < 0.05) among mean minimum and maximum temperature and solar radiation. The carbon dioxide concentration over Malawi has been increasing over the years which is one of the contributors to rising mean minimum temperatures.Key words: Climate variation, solar radiation, temperature, weather

Biodegradation of diuron in artificially contaminated water and seawater by wood colonized with the white-rot fungus Trametes versicolor

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