Sewage Sludge

High rate anaerobic digestion of thickened primary sewage sludge is a worthwhile option where maximum biogas and minimum footprint is required.

• Pre-treatment of the sludge (mechanical) to reduce particle size followed by sonication (ultra sound)are a pre-requisite to minimise potential issues within the reactor.
• Exhaustive trials undertaken by Active Research to better understand pre-treatment protocols have revealed that hydraulic retention times can be considerably reduced if in-feed is appropriately conditioned.
• Biogas production increased  substantially.
• Biosolids generation reduced
• Methane value of biogas lifted to >70%
• Hydraulic retention time drastically reduced.
• Chemical requirement reduced 
• Rapid digestion of proteins reduces sulphide generation.