New Zealand Councils see potential in sewage oil machine
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The Southland Times | Wednesday, 24 September 2008
Invercargill-designed machinery that turns sewage-pond algae into crude oil and leaves the water clean enough for reuse has generated strong interest from southern councils.
Invercargill engineering firm B L Rayners Ltd and Christchurch company Solvent Rescue Ltd are working together to develop the machinery and plan to market and sell it as early as next year.

B L Rayners owner Wayne Harpur said New Zealand councils would be ideal customers because they collectively own 220 oxidation ponds that grow the oil-rich algae.
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