Process and apparatus for the anaerobic treatment of waste water in a filter with granular filter media.

Spain

PATENT NO 8404664
SERIAL NO

525855

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Waste water to be treated is introduced into a filter including granular material for supporting the biomass resulting from an anaerobic treatment operation. During such treatment operation biogas is formed, and the waste water being treated and the granular material supporting the biomass are continuously circulated by injecting a portion of the biogas into a tube extending vertically upwardly through the filter.

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