Food- and feed-based nutrient flows in two West African cities

Abstract

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 supply, their places of production and nutrient flows through the urban system in the two West African cities of Tamale (Ghana) and Ouagadougou (Burkina Faso). Using primary data on food and feed flows, and secondary data to assess the transformation of these flows into nutrient terms, we show that, besides urban consumption, the function of the two study sites as trade hubs significantly determines nutrient flows. In Tamale, > 50% of the nutrient inflows was neither consumed nor was lost in situ but left that city again for other destinations. At least 30% of the incoming cereals was stored in the city for later consumption or export. Ouagadougou relied more on imported goods with 40% of N imported from foreign countries compared to Tamale where only 10% of the N was imported, thus contributing to heavier nutrient extraction in remote production areas.

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Source: Karg et al. (2016)

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Notes

  1. 1.

    The peak season was considered to be the main harvest period, November/December, and the lean season was defined as the end of the dry season, April/May.

  2. 2.

    Figures on solid waste generation and collection vary, depending on the source. A more recent news report referred to an amount of 300 t of solid waste generated per day and a collection rate of 82% (Daily Graphic 2015).

References

  1. Bai X (2007) Industrial ecology and the global impacts of cities. J Ind Ecol 11:1–6. https://doi.org/10.1162/jie.2007.1296

    Article  Google Scholar 

  2. Bellwood-Howard I, Haring V, Karg H, Roessler R, Schlesinger J, Shakya M (2015) Characteristics of urban and peri-urban agriculture in West Africa: results of an exploratory survey conducted in Tamale (Ghana) and Ouagadougou (Burkina Faso). IWMI, Colombo

    Google Scholar 

  3. Bellwood-Howard I, Shakya M, Korbeogo G, Schlesinger J (2018) The role of backyard farms in two West African urban landscapes. Landsc Urb Plan 170:34–47. https://doi.org/10.1016/j.landurbplan.2017.09.026

    Article  Google Scholar 

  4. Brunner PH, Rechberger H (2004) Practical handbook of material flow analysis. CRC Press LLC, Boca Raton

    Google Scholar 

  5. Chowdhury RB, Moore GA, Weatherley AJ, Arora M (2014) A review of recent substance flow analyses of phosphorus to identify priority management areas at different geographical scales. Resour Conserv Recy 83:213–228. https://doi.org/10.1016/j.resconrec.2013.10.014

    Article  Google Scholar 

  6. Cofie OO, Kranjac-Berisavljevic G, Drechsel P (2005) The use of human waste for peri-urban agriculture in Northern Ghana. Renew Agric Food Syst 20:73–80. https://doi.org/10.1079/RAF200491

    Article  Google Scholar 

  7. Cofie OO, Kone D, Rothenberger S, Moser D, Zubruegg C (2009) Co-composting of faecal sludge and organic solid waste for agriculture: process dynamics. Water Res 43:4665–4675. https://doi.org/10.1016/j.watres.2009.07.021

    CAS  Article  PubMed  Google Scholar 

  8. Cordell D, Rosemarin A, Schröder JJ, Smit AL (2011) Towards global phosphorus security: a systems framework for phosphorus recovery and reuse options. Chemosphere 84:747–758. https://doi.org/10.1016/j.chemosphere.2011.02.032

    CAS  Article  PubMed  Google Scholar 

  9. Currie P, Lay-Sleeper E, Fernández JE, Kim J, Musango JK (2015) Towards urban resource flow estimates in data scarce environments: the case of African cities. JEP 06:1066–1083. https://doi.org/10.4236/jep.2015.69094

    Article  Google Scholar 

  10. Daily Graphic (2015) Tamale Metropolitan assembly faces waste management hurdle. Peacefmonline. http://www.peacefmonline.com/pages/local/news/201508/251963.php. Accessed 18 Jan 2018

  11. Decker EH, Elliott S, Smith FA, Blake DR, Sherwood Rowland F (2000) Energy and material flow through the urban system. Annu Rev Energy Environ 25:685–740

    Article  Google Scholar 

  12. Diogo RVC, Buerkert A, Schlecht E (2010) Horizontal nutrient fluxes and food safety in urban and peri-urban vegetable and millet cultivation of Niamey, Niger. Nutr Cycl Agroecosyst 87:81–102. https://doi.org/10.1007/s10705-009-9315-2

    Article  Google Scholar 

  13. Drechsel P, Hanjra MA (2016) Green opportunities for urban sanitation challenges through energy, water and nutrient recovery. In: Dodds F, Bartram J (eds) The water, food, energy and climate nexus: challenges and an agenda for action. Earthscan, Routledge, Abingdon

    Google Scholar 

  14. Drechsel P, Graefe S, Fink M (2007) Rural–urban food, nutrient and virtual water flows in selected West African cities. IWMI Research Report No. 115, IWMI, Colombo, Sri Lanka

  15. Erni M, Bader H, Drechsel P, Scheidegger R, Zurbrügg C, Kipfer R (2011) Urban water and nutrient flows in Kumasi, Ghana. Urb Water J 8:135–153. https://doi.org/10.1080/1573062X.2011.581294

    CAS  Article  Google Scholar 

  16. Færge J, Magid J, Penning de Vries FWT (2001) Urban nutrient balance for Bangkok. Ecol Model 139:63–74

    Article  Google Scholar 

  17. Feedipedia (2018). https://www.feedipedia.org/

  18. Firmansyah I, Spiller M, de Ruijter FJ, Carsjens GJ, Zeeman G (2017) Assessment of nitrogen and phosphorus flows in agricultural and urban systems in a small island under limited data availability. Sci Total Environ 574:1521–1532. https://doi.org/10.1016/j.scitotenv.2016.08.159

    CAS  Article  PubMed  Google Scholar 

  19. Forster T, Escudero AG (2014) City regions as landscapes for people, food and nature. EcoAgriculture Partners, on behalf of the Landscapes for People, Food and Nature, Washington, DC

  20. Ghana Statistical Service (2013) 2010 population & housing census: national analytical report, Accra, Ghana

  21. Ghana Statistical Service (2014) 2010 population & housing census: district analytical report, Tamale Metropolis, Accra, Ghana

  22. Goldstein B, Birkved M, Fernández J, Hauschild M (2017) Surveying the environmental footprint of urban food consumption. J Ind Ecol 21:151–165. https://doi.org/10.1111/jiec.12384

    CAS  Article  Google Scholar 

  23. Heinss U, Larmie SA, Strauss M (1998) Solids separation and pond systems for the treatment of faecal sludges in the tropics: lessons learnt and recommendations for preliminary design. SANDEC Report No. 05/98, Duebendorf, Switzerland

  24. Institut National de la Statistique et de la Démographie (2015) Annuaire statistique 2014. Ministère de l’économie et des finances, Burkina Faso

    Google Scholar 

  25. Karg H, Drechsel P, Akoto-Danso E, Glaser R, Nyarko G, Buerkert A (2016) Foodsheds and city region food systems in two West African cities. Sustainability 8:1175. https://doi.org/10.3390/su8121175

    Article  Google Scholar 

  26. Karg H, Bellwood-Howard I, Akoto-Danso EK, Schlesinger J, Chagomoka T, Drescher A (under review) A small town agricultural markets in northern Ghana and their connection to rural and urban transformation. Eur J Dev Res

  27. Kennedy C, Cuddihy J, Engel-Yan J (2007) The changing metabolism of cities. J Ind Ecol 11:43–59. https://doi.org/10.1162/jie.2007.1107

    CAS  Article  Google Scholar 

  28. Keraita B, Drechsel P, Cofie OO, Nikiema J (2015) Productive and safe use of urban organic wastes and wastewater in urban food production systems in low-income countries. In: de Zeeuw H, Drechsel P (eds) Cities, food and agriculture; towards resilient urban food systems. Earthscan, Routledge, Abingdon

    Google Scholar 

  29. Maidment RI, Grimes D, Allan RP, Tarnavsky E, Stringer M, Hewison T, Roebeling R, Black E (2014) The 30 year TAMSAT African Rainfall Climatology And Time series (TARCAT) data set. J Geophys Res Atmos 119:10619–10644. https://doi.org/10.1002/2014JD021927

    Article  Google Scholar 

  30. Metson GS, Bennett EM (2015) Phosphorus cycling in Montreal’s food and urban agriculture systems. PLoS ONE 10:e0120726. https://doi.org/10.1371/journal.pone.0120726

    CAS  Article  PubMed  PubMed Central  Google Scholar 

  31. Miezah K, Obiri-Danso K, Kádár Z, Fei-Baffoe B, Mensah MY (2015) Municipal solid waste characterization and quantification as a measure towards effective waste management in Ghana. Waste Manag 46:15–27. https://doi.org/10.1016/j.wasman.2015.09.009

    Article  PubMed  Google Scholar 

  32. Otoo M, Drechsel P (eds) (2018) Resource recovery from waste: business models for energy. Nutrient and water reuse in low- and middle-income countries. Earthscan, Routledge, Abingdon

    Google Scholar 

  33. Otoo M, Drechsel P, Danso G, Gebrezgabher S, Rao K, Madurangi G (2016) Testing the implementation potential of resource recovery and reuse business models: from baseline surveys to feasibility studies and business plans. Resource Recovery and Reuse Series 10, International Water Management Institute (IWMI). CGIAR Research Program on Water, Land and Ecosystems (WLE), Colombo, Sri Lanka

  34. Pradhan SK, Opuni SC, Fosu M, Drechsel P (2013) Municipal organic waste management: challenges and opportunities in Tamale, Ghana. Paper presented at the 36th WEDC [Water, Engineering and Development Centre] international conference on delivering water, sanitation and hygiene services in an uncertain environment, Nakuru, Kenya, 1–5 July 2013

  35. Predotova M, Gebauer J, Diogo RV, Schlecht E, Buerkert A (2010) Emissions of ammonia, nitrous oxide and carbon dioxide from urban gardens in Niamey, Niger. Field Crops Res 115:1–8. https://doi.org/10.1016/j.fcr.2009.09.010

    Article  Google Scholar 

  36. Stadlmayr B et al (2012) West African Food Composition Table—Table de composition des aliments d’Afrique de l’Ouest. FAO, Rome

    Google Scholar 

  37. Tarnavsky E, Grimes D, Maidment R, Black E, Allan RP, Stringer M, Chadwick R, Kayitakire F (2014) Extension of the TAMSAT satellite-based rainfall monitoring over Africa and from 1983 to present. J Appl Meteorol Climatol 53:2805–2822. https://doi.org/10.1175/JAMC-D-14-0016.1

    Article  Google Scholar 

  38. UN-HABITAT (2016) Urbanization and structural transformation. Structural Transformation 2, Nairobi, Kenya

Download references

Acknowledgements

This work was carried out as part of the UrbanFoodPlus project, jointly funded by the German Federal Ministry of Education and Research (BMBF) and the German Federal Ministry for Economic Cooperation and Development (BMZ) under the initiative GlobE – Research for the Global Food Supply, Grant Numbers 031A242-A and 031A242-D, with support from the CGIAR research programme on Water, Land and Ecosystems.

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Correspondence to Hanna Karg.

Appendices

Appendix 1

Form used to record food flows on the access road to Tamale (Ghana).

figurea

Appendix 2

Nutrient contents of food and feed items recorded in the survey of Tamale (Ghana) and Ouagadougou (Burkina Faso).

Category Commodity Nutrient content (kg t−1) Source Remarks
N P K
Cereals Maize 13 2.41 3.05 Stadlmayr et al. (2012)  
Rice 11.50 1.15 0.98 Stadlmayr et al. (2012)  
Millet 18.70 3.11 3.80 Stadlmayr et al. (2012)  
Fruits Watermelon 0.80 0.09 1.09 Stadlmayr et al. (2012)  
Orange 1.20 0.19 1.66 Stadlmayr et al. (2012)  
Banana 2.20 0.25 3.76 Stadlmayr et al. (2012)  
Mango 0.90 0.18 1.80 Stadlmayr et al. (2012)  
Livestock and fish Cattle 29.40 1.82 3.05 Stadlmayr et al. (2012)  
Fish 36.60 2.42 3.79 Stadlmayr et al. (2012)  
Goats 28.00 1.50 3.85 Stadlmayr et al. (2012)  
Sheep 26.30 1.49 2.50 Stadlmayr et al. (2012)  
Chickens 32.60 1.94 2.76 Stadlmayr et al. (2012)  
Roots, tubers and legumes Yam 3.10 0.53 8.16 Stadlmayr et al. (2012)  
Groundnut 41.00 3.94 7.20 Stadlmayr et al. (2012)  
Bean 5.00 0.56 2.42 Stadlmayr et al. (2012)  
Cassava 1.80 0.47 2.71 Stadlmayr et al. (2012)  
Plantain 1.90 0.34 5.00 Stadlmayr et al. (2012)  
Sweet potato 2.40 0.43 4.16 Stadlmayr et al. (2012)  
Vegetables Tomato 1.60 0.32 2.55 Stadlmayr et al. (2012)  
Onion 1.80 0.39 1.83 Stadlmayr et al. (2012)  
Hot pepper 3.00 0.43 3.31 Stadlmayr et al. (2012)  
Avocado 2.70 0.46 4.92 Stadlmayr et al. (2012)  
Cabbage 2.50 0.37 3.17 Stadlmayr et al. (2012)  
Animal feeda Cassava peel 7.38 2.10 6.40 Feedipedia (2018)  
Cowpea forage 27.85 2.40 19.10 Feedipedia (2018) Aerial part, fresh
Fresh grass 5.18 0.77 6.29 Feedipedia (2018) Fresh weight taken into account (i.e. nutrient contents reduced by 40.6% [feedipedia]); assumed type of grass: Andropogon (Andropogon canaliculatus)
Groundnut forage 24.15 2.00 18.90 Feedipedia (2018) Fresh
Maize bran 18.31 3.40 7.30 Feedipedia (2018)  
Fodder (not specified) 15.83 1.62 11.58 Calculated for Tamale (considering proportional nutrient contents by weight)  
Pigeon pea forage 29.23 1.80 14.70 Feedipedia (2018) Aerial part, fresh
Rice straw 6.46 0.90 18.00 Feedipedia (2018)  
Soybean forage 24.15 2.70 20.23 Feedipedia (2018) Aerial part, fresh
Bean forage 11.36 1.10 23.50 Feedipedia (2018) Common bean straw
Millet stalks 8.40 1.50 23.80 Feedipedia (2018) Pearl millet (Pennisetum glaucum), straw
Sorghum forage 5.92 0.70 12.90 Feedipedia (2018) Sorghum hay
Maize stalks 5.92 0.70 13.60 Feedipedia (2018) Maize stover, dried
Fodder (not specified) 13.85 2.40 10.37 Calculated for Ouagadougou (considering proportional nutrient contents by weight)  
Faecal sludge Dewatered faecal sludge (20% of raw sludge) 10.5 10.2 3.9 Cofie et al. (2009)  
Municipal waste HH organic waste 14.3 4.6 13.0 Cofie et al. (2009) Market and HH waste were merged for the nutrient contents of municipal waste
Market organic waste 12.5 4.5 9.4 Cofie et al. (2009) Market and HH waste were merged for the nutrient contents of municipal waste
  1. aFor animal feed, dry weight was assumed, apart from fresh gras
  2. HH household

Appendix 3

Quantification of faecal sludge and solid waste in Tamale (Ghana).

Sanitation % of urban households kg cap−1 day−1 Remark
Open defecation 25.6 1.45  
Private 19.6 1.8 Including 0.35 L for anal cleansing (wet)
Public 54 1.8 Including 0.35 L for anal cleansing (wet)
  Source: Ghana Statistical Service (2014) Source: Heinss et al. (1998)  
  Total waste generated (t day−1) Organic fraction (%) Total waste collected (t day−1)
Municipal solid waste (scenario 1) 250 60 115
Source: Pradhan et al. (2013) Source: Miezah et al. (2015) Source: Personal communication (Abudu Imoro, Deputy Regional Manager, Zoomlion Ghana Limited, 2014)
Municipal solid waste (scenario 2) 300 60 246
Source: Daily Graphic (2015) Source: Miezah et al. (2015) Source: Daily Graphic (2015)

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Karg, H., Akoto-Danso, E.K., Drechsel, P. et al. Food- and feed-based nutrient flows in two West African cities. Nutr Cycl Agroecosyst 115, 173–188 (2019). https://doi.org/10.1007/s10705-018-9944-4

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Keywords

  • Food supply
  • Nutrient flows
  • Resource recovery
  • Urban metabolism
  • West Africa