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Ti Tree: Converting waste into energy employing a circular economy approach


Ti Tree Bioenergy is a waste disposal facility that utilises bioreactor technology to rapidly stabilise waste while capturing environmentally damaging methane and converting it into electricity.

Ti Tree

 

THE CHALLENGE

Reducing landfill waste will continue to be a major challenge for Brisbane and other municipalities within south east Queensland. Diverting domestic waste from landfill through sustainable waste management practices and resource recovery solutions are critical in meeting this challenge.
 

THE SOLUTION

Ti Tree Bioenergy is a waste disposal facility that utilises bioreactor technology to rapidly stabilise waste while capturing environmentally damaging methane and converting it into electricity.
Ti Tree Bioenergy is a joint venture between Veolia and JJ Richards which is managed by Veolia. Veolia contributes to all standard company practices, including strategies toward developing and operating sustainable environmental solutions into the joint venture.

The facility utilises the 36 million m3 void left over from a previous open cut coal operation on the outskirts of Ipswich. As the site is filled, completed areas are rehabilitated to complement the surrounding natural environment.
The degrading waste mass produces landfill gas which is mostly methane. This gas is captured through a network of horizontal and vertical gas lines and fed to the power station. Specially designed engines utilise the gas as a fuel source, generating green electricity used to power homes and businesses in the region.
At present, the site has the capacity to produce close to 3.3 megawatt (MW) of electricity, however this is planned to expand over the next ten years to approx. 10 MW. The current production is equivalent to producing enough renewable electricity to supply 2,500 households every day, offsetting nearly 3 Mt of greenhouse gas over the next ten years.
Waste streams accepted are general waste (putrescible), commercial and industrial waste, contaminated soil, regulated waste, bioremediation of contaminated soil, monocell disposal, biological and organic waste, and liquid waste.
 

THE RESULT

The Bioreactor process is an environmentally sustainable waste management practice. This is achieved through maximising energy capture to produce power. In addition the process:
  • minimises greenhouse emissions by producing a renewable energy that qualifies for credits under the Federal Greenhouse programme.
  • utilises the moisture, nutrient and bacterial value from within waste streams such as Biosolids to enhance energy production.
  • creates long term containment and stabilisation of odorous waste streams within highly engineered Bioreactor cells.
  • creates the potential for re-mining of the stabilised processed waste streams following Bioreactor processing to produce screened products suitable for use in mine site rehabilitation programmes and/or commercial horticultural, landscaping application.
 

KEY FIGURES

  • Supplying green energy to more than 2,500 households
  • Converting waste into energy since 2008
  • 28,000 MWh of electricity produced to date (2008 – 2014).
 
For more information about Ti Tree  Bioenergy click here.