Advantages of Sulaway plant Flow scheme Upgrading of bio gasAn active carbon plant is a cheap investment, but extremely expensive in production and maintenance.SULAWAY versus active coalActive carbon can only be applied for H2S content smaller than 100 ppmV.Extra investment costs due to process equipment:Blower/booster compressorOne (1) heat exchangersProduction costs:Active coalExtra electric powerTransport and processing of polluted waste, mainly carbon.Sulaway decreases costs by transforming H2S in sulfuric acid ( H2SO).MaintenanceRegular replacement of coalSulaway plant checkup each half year for gas compressor.