FILTRATION & PROCESS BIOGAS UPGRADING - HHNK BEVERWIJK CASE STUDY BIOMETHANE FROM WASTEWATER Pentair Haffmans has supplied a biogas upgrading installation to the Hoogheemraad- schap Hollands Noorderkwartier (HHNK) wastewater treatment plant in Beverwijk, the Netherlands. Here, biogas generated from sludge is upgraded to biomethane and carbon dioxide (CO 2 ), thus producing two valuable products. In the wastewater treatment process water a

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