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Ntow, W.J.Gijzen, H.J.Kelderman, P.Drechsel, Pay[Farmer perceptions and pesticide use practices in vegetable production in Ghana]Farmer perceptions and pesticide use practices in vegetable production in Ghana

Assessment was done of heavy-metal contamination and its related health risks in urban vegetable farming in Accra. Samples of irrigation water (n = 120), soil (n = 144) and five different kinds of vegetable (n = 240) were collected and analyzed for copper, zinc, lead, cadmium, chromium, nickel an...


Lente, I.Keraita, Bernard N.Drechsel, PayOfosu-Anim, J.Brimah, A.K.[Risk assessment of heavy-metal contamination on vegetables grown in long-term wastewater irrigated urban farming sites in Accra, Ghana]Risk assessment of heavy-metal contamination on vegetables grown in long-term wastewater irrigated urban farming sites in Accra, Ghana

Quantitative microbial risk assessment (QMRA) is frequently used to estimate health risks associated with wastewater irrigation and requires pathogen concentration estimates as inputs. However, human pathogens, such as viruses, are rarely quantified in water samples, and simple relationships betw...


Silverman, A.I.Akrong, M.O.Amoah, PhilipDrechsel, PayNelson, K.L.[Quantification of human norovirus GII, human adenovirus, and fecal indicator organisms in wastewater used for irrigation in Accra, Ghana]Quantification of human norovirus GII, human adenovirus, and fecal indicator organisms in wastewater used for irrigation in Accra, Ghana

With a rapidly growing urban population in Kumasi, Ghana, the consumption of street food is increasing. Raw salads, which often accompany street food dishes, are typically composed of perishable vegetables that are grown in close proximity to the city using poor quality water for irrigation. This...


Barker, S.F.Amoah, PhilipDrechsel, Pay[A probabilistic model of gastroenteritis risks associated with consumption of street food salads in Kumasi, Ghana: evaluation of methods to estimate pathogen dose from water, produce or food quality]A probabilistic model of gastroenteritis risks associated with consumption of street food salads in Kumasi, Ghana: evaluation of methods to estimate pathogen dose from water, produce or food quality
Semasinghe, C.Benders, J.Vairavamoorthy, VisakanFernando, SudarshanaDrechsel, Pay[Vulnerability and resilience of the Colombo urban food system to extreme weather]Vulnerability and resilience of the Colombo urban food system to extreme weather

Recent studies have examined the urban metabolism of cities using urban consumption as a proxy for food inflows but very few studies have aimed at quantifying the role of cities as trade hubs and nutrient sinks of their hinterlands. We therefore examined the linkages between food and animal feed ...


Karg, H.Akoto-Danso, Edmund K.Drechsel, PayAbubakari, A.-H.Buerkert, Andreas[Food- and feed-based nutrient flows in two West African cities]Food- and feed-based nutrient flows in two West African cities

Rapid urban growth in sub-Saharan Africa challenges food supply of cities. As food and other organic matter are transported from production areas to consumption points, water, which has been used for their production, is transported virtually. This study aimed at determining the magnitude and sou...


Akoto-Danso, Edmund K.Karg, H.Drechsel, PayNyarko, G.Buerkert, Andreas[Virtual water flow in food trade systems of two West African cities]Virtual water flow in food trade systems of two West African cities

Most cities in developing countries fail to treat their wastewater comprehensively. Consequently, farmers downstream use poor-quality water for irrigation. This practice implies risks for farmers, consumers and the environment. Conversely, this water supply supports the livelihood of these farmer...


Saldias, C.Speelman, S.Drechsel, PayHuylenbroeck, G. van[A livelihood in a risky environment: farmers’ preferences for irrigation with wastewater in Hyderabad, India]A livelihood in a risky environment: farmers’ preferences for irrigation with wastewater in Hyderabad, India

Phosphorus (P) is a critical, geographically concentrated, nonrenewable resource necessary to support global food production. In excess (e.g., due to runoff or wastewater discharges), P is also a primary cause of eutrophication. To reconcile the simultaneous shortage and overabundance of P, lost ...


Mayer, B.K.Baker, L.A.Boyer, T.H.Drechsel, PayGifford, M.Hanjra, Munir A.[Total value of phosphorus recovery]Total value of phosphorus recovery

There is a proactive interest in recovering water, nutrients and energy from waste streams with the increase in municipal wastewater volumes and innovations in resource recovery. Based on the synthesis of wastewater data, this study provides insights into the global and regional “potential” of wa...


Qadir, ManzoorDrechsel, PayCisneros, B.J.Kim, Y.Pramanik, A.Mehta, P.Olaniyan, O.[Global and regional potential of wastewater as a water, nutrient and energy source]Global and regional potential of wastewater as a water, nutrient and energy source

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