Coal filters at the Moscow Oil Refinery's treatment facility.

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Coal filters at the Moscow Oil Refinery's treatment facility.

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The coal filter section at the waste treatment facility of the Moscow Oil Refinery.

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The coal filter section at the waste treatment facility of the Moscow Oil Refinery.

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The coal filter section at the waste treatment facility of the Moscow Oil Refinery.

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The coal filter section at the waste treatment facility of the Moscow Oil Refinery.

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Alexander Dyukov, CEO and Chairman of the Management Board at Gazpromneft, during a visit to the Moscow Oil Refinery.

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Moscow Mayor Sergei Sobyanin visits the Moscow Oil Refinery.

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From left: Alexander Dyukov, CEO and Chairman of the Management Board at Gazpromneft, with Moscow Mayor Sergei Sobyanin during a visit to the Moscow Oil Refinery.

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Moscow Mayor Sergei Sobyanin, left, visits the Moscow Oil Refinery.

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Moscow Mayor Sergei Sobyanin, left, visits the Moscow Oil Refinery.

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Biosphere waste water treatment facility on the screen at the Moscow Oil Refinery.

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Coal filters at the Moscow Oil Refinery's treatment facility.

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Coal filters at the Moscow Oil Refinery's treatment facility.

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Coal filters at the Moscow Oil Refinery's treatment facility.

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Coal filters at the Moscow Oil Refinery's treatment facility.

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Coal filters at the Moscow Oil Refinery's treatment facility.

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Coal filters at the Moscow Oil Refinery's treatment facility.

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