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.
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Karg, H.
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Drechsel, Pay
,
Nyarko, G.
,
Buerkert, Andreas
,
[Virtual water flow in food trade systems of two West African cities]
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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.
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Speelman, S.
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Drechsel, Pay
,
Huylenbroeck, G. van
,
[A livelihood in a risky environment: farmers’ preferences for irrigation with wastewater in Hyderabad, India]
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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.
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Baker, L.A.
,
Boyer, T.H.
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Drechsel, Pay
,
Gifford, M.
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Hanjra, Munir A.
,
[Total value of phosphorus recovery]
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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, Manzoor
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Drechsel, Pay
,
Cisneros, B.J.
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Kim, Y.
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Pramanik, A.
,
Mehta, P.
,
Olaniyan, O.
,
[Global and regional potential of wastewater as a water, nutrient and energy source]
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Global and regional potential of wastewater as a water, nutrient and energy source
Billions of people currently lack clean water and sanitation. By 2050 the global population will have grown to nearly 10 billion, over two-thirds of whom will live in urban areas. This Voices asks: what are the research and water-management priorities to ensure clean water and sanitation in the w...
Jamwal, P.
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Brown, R.
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Kookana, R.
,
Drechsel, Pay
,
McDonald, R.
,
Vorosmarty, C.J.
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Vliet, M.T.H. van
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Bhaduri, Anik
,
[The future of urban clean water and sanitation]
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The future of urban clean water and sanitation
When urban areas expand without concomitant increases in wastewater treatment capacity, vast quantities of wastewater are released to surface waters with little or no treatment. Downstream of many urban areas are large areas of irrigated croplands reliant on these same surface water sources. Case...
Many urban farmers in Accra collect irrigation water from streams and open drains, which they store in small, on-farm ponds before use. Given that this water can be highly contaminated with wastewater, another potential role of the ponds is to disinfect irrigation water prior to use. To better un...
Silverman, A.I.
,
Akrong, M.O.
,
Drechsel, Pay
,
[On-farm treatment of wastewater used for vegetable irrigation: bacteria and virus removal in small ponds in Accra, Ghana]
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On-farm treatment of wastewater used for vegetable irrigation: bacteria and virus removal in small ponds in Accra, Ghana
The role of urban agriculture in global food security is a topic of increasing discussion. Existing research on urban and peri-urban agriculture consists largely of case studies that frequently use disparate definitions of urban and peri-urban agriculture depending on the local context and study ...
Thebo, A.L.
,
Drechsel, Pay
,
Lambin, E.F.
,
[Global assessment of urban and peri-urban agriculture: irrigated and rainfed croplands]
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Global assessment of urban and peri-urban agriculture: irrigated and rainfed croplands
The dissipation and persistence of endosulfan (6,7,8,9,10,10-hexachloro-1,5,5a,6,9,9a-hexahydro- 6,9-methano-2,4,3-benzodioxathiepin 3-oxide) applied to field-grown tomato (Lycopersicon esculentum) were studied at a vegetable-growing location in Ghana. Plant tissue samples and cropped soil collec...
Ntow, W.J.
,
Ameyibor, J.
,
Kelderman, P.
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Drechsel, Pay
,
Gijzen, H.J.
,
[Dissipation of endosulfan in field-grown tomato (Lycopersicon esculentum) and cropped soil at Akumadan, Ghana]
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Dissipation of endosulfan in field-grown tomato (Lycopersicon esculentum) and cropped soil at Akumadan, Ghana
In the present study, the concentrations of persistent organochlorine (OC) pesticides such as dichlorodiphenyltrichloroethane and its metabolites (DDTs), hexachlorocyclohexane isomers (HCHs), hexachlorobenzene (HCB) and dieldrin in pooled samples of human breast milk (n ? 109), and serum (n ? 115...
Ntow, W.J.
,
Tagoe, L.M.
,
Drechsel, Pay
,
Kelderman, P.
,
Gijzen, H.J.
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Nyarko, E.
,
[Accumulation of persistent organochlorine contaminants in milk and serum of farmers from Ghana]
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Accumulation of persistent organochlorine contaminants in milk and serum of farmers from Ghana