Page 42 - Energize February 2022

TECHNICAL

Addis Ababa’s households with electricity. The maximum output of New horizon WtE plant (Athlone, Western Cape)
the plant is 25 MWe. The plant is designed to accept waste with a This plant does not incinerate waste but produces up to 200 t/day
CV range of 5,5 to 9,5 MJ/kg. Over 80% of this waste is eliminated of RDF from 600 t/day of mixed waste, in addition to methane and
and what remains is converted into ash. carbon dioxide from biodigestion.

Project facts References
• Capacity: 400 000 tonnes per annum 1. G Martignon: “Trends in the use of solid recovered fuels”, IEA
• Waste: Municipal solid waste (MSW) Bioenergy Task 36: 2020
• Furnace/boiler: Two-grate fired lines, vertical economiser section 2. N Scarlat: “Evaluation of energy potential of municipal solid
• Energy production: 20 MW power waste from African urban areas”, Renewable and Sustainable
• Steam parameters: 60 bar/420˚C Energy Reviews, Vol. 50, October 2015
• Flue gas treatment: SNCR, dry FGT system (lime milk in reaction 3. T Polasi: “South African Municipal Waste Management Systems:
tower), baghouse filter Challenges and Solutions”, UNEP 2020
• Commissioning: 2018 4. DEA: “South Africa: State of waste report”, 2018
5. D Moyo: “Municipal solid waste as a valuable renewable energy
Zanzibar resource: a worldwide opportunity of energy recovery by using
A small WtE system with an electrical output of 11,5 MW is waste-to-energy technologies”, Energy Procedia: October 2017
planned for the island of Zanzibar. Officials expect the plant to 6. IEA: “Municipal solid waste and its role in sustainability”, IEA
process 180 000 tonnes of MSW per year, with a maximum capacity bioenergy position paper 2003
of 20 t/h. Waste CV ranges from 6 to 9,5 MJ/kg. 7. O Ayeleru: “Municipal solid waste composition determination in
the city of Johannesburg”, WCECS 2016, 19-21October, 2016
Nelson Mandela Bay municipality (NMBM) 8. O Adeleke, et al: “Application of artificial neural networks for
A feasibility study conducted in 2014 has shown the possibility of predicting the physical composition of municipal solid waste:
constructing a WtE facility in NMBM. The plant would consist of An assessment of the impact of seasonal variation”, Waste
two lines, each capable of incinerating 300 t of MSW/day with a management and research, February 2021
total thermal power of 58,6 MWth and an electricity generating 9. L Collins: “It’s much cheaper to produce green hydrogen from
capacity of 15,2 MW. It was estimated that the project would take waste than renewables”, Recharge news, 30 April 2020
three years to complete. There do not appear to be plans to go
ahead with the project at the time of writing, however. Send your comments to rogerl@nowmedia.co.za

Figure 13: Reppie WtE plant(Hitachi)

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