THEME: EFFECTIVE WASTE MANAGEMENT IN AFRICA

Transcription

1 Pivot Works: Providing Comprehensive Human Waste Management in Kigali from Pit Latrine Emptying to Cost- Effective Treatment & Reuse Laura Stupin - Engineer, Melissa Mahoro - PV Operations Manager UNESCO-Africa Engineering Week with Africa Engineering Conference THEME: EFFECTIVE WASTE MANAGEMENT IN AFRICA Kigali Convention Center, Rwanda 25th 29th September

2 Kigali is becoming a smart city. Kigali Convention Center- Rwanda 25-29th September,

3 Where will the toilet waste go? Kigali Convention Center- Rwanda 25-29th September,

4 In many countries, 90% of sewage is left untreated 4

5 Conventional wastewater treatment is expensive to operate 5

6 Smart Sewage Treatment: Protects families Protects the environment Resource recovery Kigali Convention Center, Kigali, Rwanda-25 th -29 th September,

7 Smart Sanitation in Kigali Kigali is building itself to be a smart city, now it has the beginning of one the smartest sanitation systems in the world. Kigali has a demonstration factory that transforms sewage into renewable fuel, or green coal Selling fuel made from sewage directly offsets treatment costs Kigali Convention Center- Rwanda 25-29th September,

8 Methodology Waste processing: Pivot Works factory Partnership with the City of Kigali for 2 yrs Demonstration factory at Nduba landfill Tailored technology & process for Kigali Validated market demand for Pivot Fuel Waste collection & transport: Pit Vidura 1 year operating Kigali s only legal pit emptying service in low-income communities Developing tools & technologies tailored to Kigali s pits and terrain Kigali Convention Center, Kigali, Rwanda-25 th -29 th September,

9 SMART URBAN SANITATION

10 Pivot Works Process 10 10

11 Pivot Fuel for Industry and Manufacturing Heating boilers, kilns 18 GJ/ton superior energy content compared to sawdust, rice husks Reliable, consistent supply all year Can be co-mixed with coal and biomass fuels Kigali Convention Center, Kigali, Rwanda-25 th -29 th September,

12 Pivot Works is half the cost of other treatment plants Source: MWH Americas Ltd Kigali Convention Center, Kigali, Rwanda-25 th -29 th September,

13 Kigali break-even unit economics More waste more fuel more revenue Break-even points COGs <1 tpd Production (COGs+OPEX) 6 tpd Kigali operation (Production + General Admin) 13 tpd 13

14 How can we increase the treated waste? Improve septic tank servicing Enforce that trucks remove all solids Eliminate illegal discharge into storm drains Incorporating municipal solid waste Expanding legal pit latrine emptying services to low-income communities Kigali Convention Center, Kigali, Rwanda-25 th -29 th September,

15 Driving up fuel production: MSW incorporation experiments Put municipal solid waste into fuel instead of into landfills MSW cross-subsidy for sewage treatment Accessible (e.g. 300 tpd in Kigali) Energy dense Cheap to process 15

16 Pit latrines are a rich source of waste 1.8 billion people in the world use pit latrines One of the most common toilet types, but one of the most difficult to service in urban areas. What happens when a pit latrine fills up? Kigali Convention Center, Kigali, Rwanda-25 th -29 th September,

17 Global status quo: pit toilet emptying Full latrine or burrow hole Manual emptying with jerry cans and shovels Disposal in the environment Kigali Convention Center, Kigali, Rwanda-25 th -29 th September,

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19 Pit Vidura: Professional Pit Latrine Servicing Full pit latrine Empty with evac Pump to road with DoVac or transport in barrels Transport to treatment Over 500 safe empties to date in Kigali. Kigali Convention Center, Kigali, Rwanda-25 th -29 th September,

20 Summary Pivot Works is half the cost of other viable wastewater treatment options. Pivot Works and Pit Vidura are positioned for scaling up sewage treatment, transport, and collection. We seek further city partnership to expand within Kigali and to other cities. Kigali Convention Center, Kigali, Rwanda-25 th -29 th September,

21 City benefits Smart sanitation - lowest construction and operating costs Increased fuel supply for manufacturing Improved health and reduced lost work days, especially in low-income communities More than 30 jobs created at each plant Kigali Convention Center, Kigali, Rwanda-25 th -29 th September,

22 Projections: Kampala Comparing options for gaining 800 m 3 additional treatment capacity Pivot Works factory at Lubigi STP Building a New Conventional Plant Input (m3/d) 1200 (up from 400) 800 Capex $4 M $13 M Land No new land use 5 ha Project development time Opex <12 months >3 years (land acquisition, EIA, design, construction) Operations revenue positive ~$100,000/yr post-tax >$370,000/year 22

23 Acknowledgements Rwanda partners City of Kigali WASAC Pivot team Ashley Muspratt, CEO Alex Bingwa, Pivot Manager Rachel Sklar, Pit Vidura Manager For more information Web: Phone/whatsapp: