"I started getting calls from people in industry, and they asked if we could expand this to other waste streams, " he said.

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This, Lohan hopes, will allow the system to deal with more concentrated waste streams from big buildings and even operations like pig and dairy farms, which produce huge volumes of concentrated waste.

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Algae can be fed from waste-streams of CO2 from fossil-fuel power stations as a carbon elimination strategy and can also decontaminate groundwater, so there is a potential mix of environmental solutions in aid of a common goal of fuel beyond oil.

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But there is so much waste from operations like this one that sometimes waste makes its way into streams and pollutes the water.

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Waste firms often have multiple revenue streams, which can also help them weather a downturn.

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Coal waste mountains exposed to air started churning out acidic water, polluting groundwater and streams.

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However, waste being left behind by some in two areas of the Cairngorms raised concerns about possibility of streams flowing into the River Nethy and Loch Avon Basin.

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