Your search found 2 records
1 Buerkert, A.; Marschner, B.; Steiner, C.; Schlecht, E.; Wichern, M.; Schareika, N.; Lowenstein, W.; Drescher, A. W.; Glaser, R.; Kranjac-Berisavljevic, G.; Gnankambary, Z.; Drechsel, Pay; Jean-Pascal Lompo, D. 2015. UrbanFoodplus – African-German Partnership to enhance resource use efficiency in urban and peri-urban agriculture for improved food security inWest African cities [Abstract only] In Tielkes, E. (Ed.). Management of land use systems for enhanced food security: conflicts, controversies and resolutions. Book of abstracts. International Research on Food Security, Natural Resource Management and Rural Development, Tropentag 2015, Berlin, Germany, 16-18 September 2015. Witzenhausen, Germany: German Institute for Agriculture in the Tropics and Subtropics. pp.350-351.
Urban agriculture ; Periurban agriculture ; Irrigation ; Food security ; Nutrients ; International cooperation ; Partnerships ; Resource evaluation ; Farmers ; Soil fertility ; Organic fertilizers ; Inorganic fertilizers / West Africa / Burkina Faso / Ghana / Mali / Cameroon / Ouagadougou / Tamale / Bamako / Bamenda
(Location: IWMI HQ Call no: e-copy only Record No: H047212)
(0.09 MB)
Food security in West Africa not only depends on productivity increases in marginal rural areas, but also on enhanced use of intensively farmed agricultural “niche” lands such as the urban and peri-urban spaces. They are characterised by easy market access and input availability which allows self-reinforcing processes of agricultural intensification. However, too little is known about resource use efficiencies, matter flows and negative externalities in these systems. Starting from general assessments (status quo analyses), the African-German UrbanFoodPlus (UFP) network develops and tests site-specific, farmer-tailored innovations. These directly address the above mentioned knowledge gaps in the fourWest African cities of Ouagadougou (Burkina Faso), Tamale (Ghana), Bamako (Mali), and Bamenda (Cameroon). At all locations farmers attempt to cope with increasing land pressure by cultivating along electrical power lines, on public property, and on undeveloped private land.
2 Gehring, T.; Deineko, E.; Hobus, I.; Kolisch, G.; Lubken, M.; Wichern, M.. 2021. Effect of sewage sampling frequency on determination of design parameters for municipal wastewater treatment plants. Water Science and Technology, 84(2):284-292. [doi: https://doi.org/10.2166/wst.2020.588]
Municipal wastewater ; Wastewater treatment plants ; Sewage ; Pollutant load ; Temperature ; Estimation ; Datasets ; Uncertainty / Germany / Switzerland
(Location: IWMI HQ Call no: e-copy only Record No: H050515)
https://iwaponline.com/wst/article-pdf/84/2/284/914986/wst084020284.pdf
https://vlibrary.iwmi.org/pdf/H050515.pdf
https://vlibrary.iwmi.org/pdf/H050515.pdf
(0.59 MB) (600 KB)
The uncertainty associated with the determination of load parameters, which is a key step in the design of wastewater treatment plants (WWTPs), was investigated on the basis of data sets from 58 WWTPs. A further analysed aspect was the organic load variations associated with variable sewage temperatures. Data from 26 WWTPs with a high inflow sampling frequency was used to simulate scenarios to investigate the effect of lower sampling frequencies through a Monte Carlo approach. The calculation of 85-percentile values for chemical oxygen demand (COD) loadings based on only 26 samples per year is associated with a variability of up to ±18%. Approximately 90 samples per year will be necessary to reduce this uncertainty for estimation of COD loadings below 10%. Hence, a low sampling frequency can potentially lead to under- or overestimation of design parameters. Through an analogous approach, it was possible to identify uncertainties of ±11% in COD loading when weekly average data was used with four samples per week. Finally, a tendency to lower COD input loads with increasing temperatures was identified, with a reduction of about 1% of the average loading per degree Celsius.
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