Wastewater as a Resource, by Dr. Seneshaw Tsegaye
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Presentation made by Dr. Seneshaw Tsegaye at Africa Water Week, 27 May 2014, in Dakar, Senegal.
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Wastewater as a Resource, by Dr. Seneshaw Tsegaye
- 1. Wastewater As a Resource African Water Week May 27, 2014 Dakar, Senegal Dr. Seneshaw Tsegaye Assistant Professor Patel College of Global Sustainability UNIVERSITY OF SOUTH FLORIDA
- 2. Urban Policy & Governance Social Resiliency and Health Communicating Science in Sustainable Communities Urban Planning and Design Energy Systems Urban Water Urban Transport Patel College of Global Sustainability - Academic Areas
- 3. In many countries of sub-Saharan Africa sanitation coverage is below 50 percent Public health Wastewater as a burden Wastewater as a resource ?
- 4. Sanitation can’t be looked separately: Integration is a key Source: CSIRO Surface water Demand management Leakage management Stormwater/ Rainwater Used water recycling Greywater reuse Cascading water use Desalination Groundwater Energy & nutrient
- 5. Copyright © 2009 International Water Association 0% 20% 40% 60% 80% 100% BOD5 Nitrogen Phosphorus Potassium Percent Laundry/Bath Kitchen Feces Urine Uncontaminated Organic Matter Nutrients We need a new perspective on sanitation - Beneficiation
- 6. Copyright © 2009 International Water Association 0% 20% 40% 60% 80% 100% BOD5 Nitrogen Phosphorus Potassium Percent Laundry/Bath Kitchen Feces Urine Nutrients Think about Harvesting Nutrients from Wastewater
- 7. Billions Less Developed Regions More Developed Regions Full-scale struvite production facility West Boise Canada (Pharmer Engineering) Struvite as commercial fertilizer www.pharmereng.com 2013 (Ostara) Great ideas to recover nutrient from water cycle
- 8. Great ideas to recover nutrient from water cycle, Durban Fecal sludge into safe fertilizer: LaDePa machine
- 9. Entrepreneurs see the potential India, Malawi….. Collection, transport, treatment and reuse-system (GTZ,2009)
- 10. Copyright © 2009 International Water Association 0% 20% 40% 60% 80% 100% BOD5 Nitrogen Phosphorus Potassium Percent Laundry/Bath Kitchen Feces Urine Organic Matter We need a new perspective on sanitation - Beneficiation
- 11. Business oriented solution, Naivasha, Kenya Business oriented solution: Lavatory and wastewater treatment plant with installed biogas generation facility Public Toilet & Shower Cafe (Biogas for cooking)
- 12. NSWC, Kampala (Uganda): NAKIVUBO WASTE WATER TREATMENT PLANT CONSTRUCTION AfDB Loan - treatment: • 45,000 m3/day waste water • 15,200 kg/day BOD Energy production: Biogas holding tank: 2,900 m3 Combined biogas and heat power station: 2 x 280 kWh Source: NSWC / AfDB 2010 Thermal energy from groundwater MITIGATION Harvesting to provide greater security
- 13. New Business Model for Water Utilities- Hamburg Water Cycle Business opportunities: • Potential to recover and sell energy • Potential to recover and sell nutrients • Position of utility on the market as operator of decentralized treatment systems on district and household scale • Exporting technology and expertise to quick growing Asian cities • International consultancy Decentralized system with source separation/ Vacuum sanitation CHP
- 14. Heat exchanger in sewers MITIGATION Harvesting heat from sewers Dalian-Xinghai (China) : Environment-friendly heating and cooling
- 15. Copyright © 2009 International Water Association 0% 20% 40% 60% 80% 100% BOD5 Nitrogen Phosphorus Potassium Percent Laundry/Bath Kitchen Feces Urine Organic Matter Nutrients We need a new perspective on sanitation - Beneficiation
- 16. Copyright © 2009 International Water Association 0% 20% 40% 60% 80% 100% BOD5 Nitrogen Phosphorus Potassium Percent Laundry/Bath Kitchen Feces Urine Think about Reusing/Recycling H2O
- 17. Fresh Water Supply Waste Water Small Water Consuming Industry Fresh Water Source Waste Water from Durban City Reuse of Water [Reduction in Wastewater discharge @10%] [7% (47.50 Ml/d) of City’s Current Demand ] [Ehekwini Water Services: Build on PPP Concept] Entrepreneurs see the harvesting potential, Durban
- 18. Harvesting for agriculture • 400M m3 treated wastewater used for agriculture in Beijing in 2010 (reduce peri-urban poverty and improve food security)
- 19. We need to move away from traditional thinking Driver for water management should be beneficiation –maximize value added We need to harness the opportunities and make it work for all