Biomass

Turning trash into cash

Bulldozer working on landfill site,UK

As South Africa grapples with electricity challenges, the City of Johannesburg has a solution that can help to keep the lights on, albeit on a small scale, transforming their biggest dump into an energy supplier 


The City’s quest for alternative energy sources is gathering pace, with Pikitup, its waste management company, saying the five landfills it manages will by 2016 generate 19MW of electricity, enough to power 16 500 homes. The electricity will be generated from methane gas and carbon dioxide extracted from waste at the five landfills – Robinson Deep in Turffontein, Marie Louise in Roodepoort, Goudkoppies in Devland, Linbro Park near Alexandra and Ennerdale in Lawley. 

This fits well into Gauteng premier, David Makhura’s, recent announcement that the provincial government was investigating alternative energy sources, including solar power, to alleviate pressure on the electricity grid. The project to convert methane gas to electricity is gaining traction in the City of Johannesburg. 

The Robinson Deep landfill, which opened in 1930, stood 80 metres high and had a lifespan of only seven years. But councillor Matshidiso Mfikoe, member of the mayoral committee for Environment, Infrastructure and Service, says this could be extended to 20 years by employing new waste management techniques, some of which were already being used. She says more than 300 trucks deliver waste at the landfill daily. Gas emissions and water contamination were monitored every three months to ensure there were no environmental mishaps.

Premier Makhura said earlier that the provincial government would look to provide 300MW of energy through alternative energy sources. In 2005 the City identified the five landfills as potential sites to implement a landfill gas-to-energy Clean Development Mechanism (CDM) project. Through its implementation, the City would help South Africa meet its Kyoto Protocol commitments while generating revenue through the sale of certified emission reductions and electricity generated from the project. 

The City’s Environment, Infrastructure and Services department initiated the landfill gas-to-energy CDM project in 2007 to mitigate the harmful greenhouse gases emitted from the landfills. The renewable energy generated from the project would be fed into the municipal grid, thus offsetting largely coal derived electricity. 

The project is also in support of the City’s growth and development strategy 2040 outcome of shifting to a low carbon economy. The City signed a contract with EnerG Systems in 2009 to construct and operate the landfill gas-to-energy project over 20 years. The agreement also gave EnerG Systems exclusive rights to mine gas and generate electricity at the five sites.

Methane gas is already being converted to electricity at Robinson Deep, where 68 gas wells were installed in 2011 and at the Marie Louise, where 28 wells were installed in 2012. There were positive signs of improvement of air quality at the Robinson Deep and Marie Louise sites.

Staff reporter

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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