Wastewater use in urban agriculture: an exposure and risk assessment in Accra, Ghana

Wastewater use in urban agriculture is common as a result of rapid urbanisation and increasingcompetition for water. This study sought to assess critical exposures associated with the transmission of faecal pathogens among farmers and consumers of wastewater irrigated produce andto assess the adoption of the multiple-barrier approach advocated by the WHO guidelines tominimise health risks. From September 2012 to August 2013, 323 soil and irrigation water samples,and 501 raw produce and ready-to-eat salad samples were collected from fields, markets,and kitchens in Accra, Ghana. All samples were analysed for E. coli using standard procedures.In addition, 693 participants including farmers, vendors, and consumers were interviewed andobserved. The results showed that irrigation water was significantly more contaminated thanfarm soil, though exposure to soil was found to pose the key risk to farmers due to hand-to mouth  events (10 events/day). Over 80% of the produce samples were found contaminated with E. coli, with street food salad found to be the most contaminated (4.23 Log E. coli/g). Risk factors identified for produce contamination included farm soil, wastewater use, and poor food and environmental hygiene. Awareness of the source of irrigation water was low, but despite the high awareness of health risk, consumers did not prioritize health indicators when buying produce.The study recommends the promotion of interventions that would result in more direct benefits to producers and vendors, together with hygiene education/inspection, hygiene certification, andenforcement of food safety byelaws in order to protect health.Keywords: Ghana, wastewater irrigation, produce, risk perceptions, multiple-barrier approac

Wastewater use in urban agriculture: an exposure and risk assessment in Accra, Ghana

In order to minimize the health risks to agricultural workers, and consumers of wastewater irrigated produce, the World Health Organisation has developed guidelines for the safe use of wastewater in agriculture. This study sought to test the appropriateness of the current Quantitative Microbial Risk Assessment model and the multiple-barrier approach advocated by the WHO guidelines. Over a one year period, over 500 produce and ready-to-eat salad samples were collected from fields, markets, and kitchens in Accra, Ghana, and over 300 soil and irrigation water samples were collected. All samples were analysed for E. coli, human adenovirus and norovirus using standard microbiological procedures. In addition, almost 700 participants including farmers, food vendors, and consumers were interviewed and observed to assess critical exposures associated with the transmission of faecal pathogens. The results showed that irrigation water was significantly more contaminated than farm soil, though exposure to soil was found to pose the key risk to farmers due to hand-to-mouth events. Over 80% of produce samples were found contaminated with E. coli, with street food salad being the most contaminated (4.23 Log E. coli/g), and that consumption of salads did not meet health standards. Risk factors identified for produce contamination included farm soil contamination, wastewater use for irrigation, poor hygiene, and operating with a hygiene permit. Awareness of the source of irrigation water was low, but despite the high awareness of health risk, consumers did not prioritize health indicators when buying produce from vendors. Similarly, farmers’ awareness of health risk did not influence their adoption of safer farm practices. The study recommends the promotion of interventions that would result in more direct benefits to producers and vendors, together with hygiene education and inspection, hygiene certification and enforcement of food safety byelaws in order to increase the uptake of the multi-barrier approach

Assessing coherence between sector policies and Climate Compatible Development: Opportunities for triple wins

Climate Compatible Development (CCD) aims to deliver adaptation and mitigation without compromising development progress. To date, adaptation, mitigation and development related to key climate-sensitive sectors have often been treated separately. This paper uses qualitative document analysis, content analysis, expert interviews and a multi-stakeholder workshop to: examine the extent to which policies in climate-sensitive sectors align in framing adaptation, mitigation and development action; and identify key areas of policy coherence in Ghana. The paper answers the following questions: (i) To what extent are Ghana's agriculture, energy, water, forest and wildlife sector policies aligned with climate adaptation, mitigation and development? (ii) What is the extent of policy coherence amongst climate-sensitive sector policies? (iii) Where are the key intervention points available to enhance CCD activities? Findings demonstr ate that Ghana's climate-sensitive sector policies in agriculture, water, energy, forest and wildlife arenas have elements that demonstrate good alignment with adaptation, mitigation, and development priorities. However, as yet, there is only "limited coherence" between climate-sensitive sector policies. The paper identifies the following intervention points: (i) the need to attach greater importance to the threat posed by climate change to agriculture; and (ii) the need to address the lack of inter-agency and inter-ministerial approaches for building partnerships with other stakeholders. Multi-stakeholder workshop discussions highlighted significant challenges relating to limited coordination amongst institutions and agencies, limited institutional capacity and a lack of resources in ensuring coherence. This requires strengthening of national institutions such as the Environmental Protection Agency (EPA) to provide appropriate mechanisms to ensure effective collaboration amongst climate-sensitive sectors to deliver "triple wins". The EPA could exert greater influence by nominating "climate champions" in sector ministries

Trace elements contamination of soils around gold mine tailings dams at Obuasi, Ghana

This study investigated the issue of tailings dams as a potential source of trace elements contamination in soils at the Obuasi gold mine in Ghana. Soil samples taken from depths of up to 12 cm and within a radius of 400 m from the tailings dams (active and recommissioned), were analysed for As, Cu, Pb and Zn using atomic absorption spectrometry. Average concentrations of As, Cu, Pb and Zn in soils around the active tailings dams were respectively 581±130, 39.64 ± 3.02, 24.22 ± 2.62 and 72.64 ± 8.01 mg/kg. Soils in the vicinity of the decommissioned tailings dam registered increased values - 1711 ± 172, 71.44 ± 5.27, 38.67 ± 3.59 and 168.1 ± 36.2 mg/kg for As, Cu, Pb and Zn respectively. Both types of tailings dams impacted adjoining soils with greater concentrations of the trace elements when compared to undisturbed control soils. Arsenic was above the Netherlands intervention value of 55 mg/kg dry weight, even in control soils. The following trend of accumulation was observed in the soils: As>Zn>Cu>Pb. Improved tailings management strategies, among other factors, might have influenced the reduced level of trace elements contamination at the active tailings dams’ site

Assessment of contamination of singed hides from cattle and goats by heavy metals in Ghana

Many local butchers in Ghana have been using scrap tyres as substitute for firewood to singe slaughtered ruminants. This study analysed such singed hides from seven goats and three cattle in unregulated local slaughtering operations near the Kumasi abattoir, for risk of heavy metal contamination (Mg, Mn, Cu, Ni, Cd, Pb and Zn) using atomic absorption spectrometry. Relative to unsinged control hides, singed treatments generally elevated heavy metal levels in both goats and cattle hides. Magnesium, Mn, Cu, Ni and Cd concentrations in un-singed goats hide increased by 23, 29, 54, 24 and 20% respectively to 108.63 ± 3.85, 0.83 ± 0.13, 1.63 ± 0.13, 2.15 ± 0.29 and 2.26 ± 0.20 mg/kg in the singed material. Similarly, singeing increased Mg, Mn, Cu, Ni, Cd and Zn concentrations in cattle hide by 94, 49, 130, 33, 174 and 1055% to 80.0 ± 5.25, 2.13 ± 0.26, 5.67 ± 1.24, 3.50 ± 0.17, 4.20 ± 0.17, and 204.49 ± 36.69 mg/kg respectively. Lead concentration in cattle hide on the other hand decreased by 34% upon singeing, from 4.61 ± 0.30 mg/kg in un-singed controls to 3.06 ± 0.26 mg/kg in singed material. High concentrations of the metals in singed hides could not be entirely attributed to the singed treatment alone, in view of considerable background levels of heavy metals recorded in the un-singed samples; a situation that probably reflected a larger problem of heavy metal pollution in the local environment. Concentrations of Cd and Pb in hides were above maximum permissible levels (MPLs) of 0.05 and 0.01 mg/kg respectively set by the European Commission Regulation, whilst Zn was also above MPL of 50.0 mg/kg, according to the Meat Food Products Order of India. It was concluded that the hides were potentially unsafe for human consumption.Key words: Heavy metal contamination, meat products, singed treatments, consumed animal hide

Modelling Formal and Informal Domestic Water Consumption in Accra

Urban utilities in developing countries are often unwilling to extend coverage or improve services for fear that not enough water is available. This study used modelling to project the city-level water demand implications of slum water improvements in Accra (Ghana). The research collated existing data around water use patterns and also used purpose-designed surveys to explore usage and demand in slum communities in more depth

Gendered perceptions and adaptation practices of smallholder cocoa farmers to climate variability in the Central Region of Ghana

Understanding gendered adaptation practices among smallholder cocoa farmers is crucial to ensuring sustainable cocoa production in Ghana. This study examined the gendered perceptions and adaptation practices of smallholder cocoa farmers to climate variability in three selected communities (Breman Ayipey, Breman Baako and Breman Kuntanase) in the Asikuma-Odoben-Brakwa District of the Central Region, Ghana. The study adopted a mixed-methods approach including household surveys and focus group discussions with 10 participants in each community. Mann-Kendall trend test was used to determine the rainfall and temperature changes in the study district from 2000 to 2015. Results indicated that there was no significant difference between male and female farmers’ perceptions of climate variability (p > 0.05). Both male and female farmers perceived an increasing temperature, rainfall, windstorms and flooding for the past 15 years. The Mann-Kendall trend test showed that annual rainfall and temperature had increased over the study period although the trends were not statistically significant (p > 0.05). Both male and female farmers had resorted to the use of different adaptation practices to reduce the threats of climate variability. There was a substantial difference between adaptation practices used by male and female farmers such as changing planting dates, use of drought tolerant hybrids, shade management, livestock rearing and income from sale of properties (p < 0.05). The study recommends policy formulations that incorporate gender perspectives into climate change adaptation practices among smallholder cocoa farmers in Ghana

Using traditional agroecological knowledge to adapt to climate change and variability in the Upper East Region of Ghana

Ghana's susceptibility to climate change is well documented and the agricultural sector which is the backbone of the country's economy is one of the most vulnerable sectors to the adverse effects of climate change. This study employed both quantitative and qualitative research methods including household surveys and focus group discussions to examine the extent to which traditional agroecological knowledge is used to manage climate change in three selected communities (Gia, Gaani and Nyangua) of the Kassena Nankana Municipality in the Upper East Region of Ghana. The study specifically answers the following research questions: (i) What is the extent of rainfall and temperature changes in the municipality from 1983–2017? (ii) What is the perception of farmers on rainfall and temperature changes in the selected communities for the past three decades? (iii) What are the key adaptation practices used by farmers to reduce the threats of climate change? (iv) What are the traditional agroecological indicators used by farmers to predict rainfall in the study communities? Mann-Kendall trend test was used to assess rainfall and temperature trends over the study period. Results from the trend analysis indicated an inconsistent pattern in rainfall and an increasing trend in temperature in the municipality. Results also showed that farmers perceived decreasing trend in rainfall as well as increasing temperature. Farmers’ perception of decreased trend in rainfall was inconsistent with the analysed rainfall data as the trend of rainfall was statistically insignificant (p > 0.05) and Sen's slope confirmed a positive slope indicating that amounts of rainfall had increased in the municipality. The farmers employed a variety of on-farm and off-farm practices including the use of traditional agroecological knowledge, use of improved varieties of crops and temporary migration to adapt to the impacts of climate change in the study communities. The farmers predicted rainfall onset using a variety of traditional agroecological indicators including direction of wind, croaking of frogs, appearance of cattle egret and flowering and fruiting of local trees. The study recommends the putting in place of a framework that blends traditional agroecological knowledge and scientific knowledge to develop effective climate change adaptation strategies

Perceived stressors of climate vulnerability across scales in the Savannah zone of Ghana: a participatory approach

Smallholder farmers in sub-Saharan Africa are confronted with climatic and non-climatic stressors. Research attention has focused on climatic stressors, such as rainfall variability, with few empirical studies exploring non-climatic stressors and how these interact with climatic stressors at multiple scales to affect food security and livelihoods. This focus on climatic factors restricts understanding of the combinations of stressors that exacerbate the vulnerability of farming households and hampers the development of holistic climate change adaptation policies. This study addresses this particular research gap by adopting a multi-scale approach to understand how climatic and non-climatic stressors vary, and interact, across three spatial scales (household, community and district levels) to influence livelihood vulnerability of smallholder farming households in the Savannah zone of northern Ghana. This study across three case study villages utilises a series of participatory tools including semi-structured interviews, key informant interviews and focus group discussions. The incidence, importance, severity and overall risk indices for stressors are calculated at the household, community, and district levels. Results show that climatic and non-climatic stressors were perceived differently; yet, there were a number of common stressors including lack of money, high cost of farm inputs, erratic rainfall, cattle destruction of crops, limited access to markets and lack of agricultural equipment that crossed all scales. Results indicate that the gender of respondents influenced the perception and severity assessment of stressors on rural livelihoods at the community level. Findings suggest a mismatch between local and district level priorities that have implications for policy and development of agricultural and related livelihoods in rural communities. Ghana’s climate change adaptation policies need to take a more holistic approach that integrates both climatic and non-climatic factors to ensure policy coherence between national climate adaptation plans and District development plans

Climate information services available to farming households in Northern Region, Ghana

Climate information services can build the resilience of African farmers to address the increasing threats associated with climate change. This study used household surveys with 200 farmers and focus group discussions to identify the types of climate information services available to farming households in two selected districts (Tolon and Nanton) in the Northern Region of Ghana. The study also identified the dissemination channels and the barriers faced by farmers in their access and use of climate information services for building climate resilience in Ghanaian farming systems. Multinomial logistic regression analysis was used to evaluate the determinants of farmers’ access to climate information services. Results show that 70% of the surveyed farmers had access to varied forms of climate information services. The most prevalent meteorological variables accessible to them were rainfall, temperature, and windstorms in the form of daily and weekly weather forecasts, with only very limited availability and use of seasonal climate forecasts. Radio, television, and advice from extension agents were reported as the major dissemination channels by study respondents. A majority of the farmers reported lack of communication devices, mistrust in weather and climate forecasts, and lack of visual representations in the forecasts as major barriers to access and use of climate information services. The results highlight the importance of timely and reliable access to climate information services in enhancing farmers’ decision-making capacities and the need for training and recruitment of more extension agents to work with farmers on linking climate information services to targeted actions on crop and land management