Eco Innovator March 2012

Equity Capital

Soil Remediation Investment

Last October Cleantech Ventures and an institutional investor completed an investment of up to $20 million in Renex Holdings (Dandenong) 1 Pty Ltd.

Renex was established to develop a soil remediation facility in Dandenong South, Victoria utilizing a world leading technology.

Renex's plants can treat thousands of tonnes of waste materials per annum. Predominantly this is to clean hydrocarbons and other volatile contaminants from materials. Often the treated material can be used again without hazard and will become biologically active.

Renex uses what it says is a safe, reliable thermal treatment. Typically it consists of a dryer, pyrolysis kiln, and a central combustion chamber. The gas cleaning system is a five stage system with a spray dryer, fabric filter, activated carbon filter and two acid gas scrubbers.

The Renex plants are based on proven best available commercial reference plants that have been operating in many parts of the world for many years, says the company.

The pyrolysis system is based on sophisticated European thermal desorption technology comprising an indirectly heated rotary kiln. The kiln evaporates moisture in the material and decomposes and gasifies volatile organic matter and inorganic chemical substances such as mercury and cyanides through radiation and convection at a temperature of 600 degrees. The heating occurs in the absence of oxygen at relatively low temperatures and so prevents the generation of dioxins.

The volatized contaminants are fed into a combustion chamber and destroyed at a temperature of 1200 degrees.

An air pollution control system ensures emissions are well within EPA limits, says Renex.

The waste materials are mixed to provide sufficient energy to fuel the plant without the need for auxiliary fuel. This "Waste-To-Energy" principle ensures the sustainability of the plant's operation and minimises its greenhouse gas emissions.

Last financial year nearly 12,000 tonnes of Category B and about 360,000 tonnes of Category C contaminated soil was disposed to landfill. In 2007, the Victorian government announced a target of zero high hazard waste to landfill by 2020. This facility will help Victoria to achieve the target.





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