Anaerobic Sludge Digester Distributor GFS Digester Tanks for Sludge Stabilization Municipal and industrial wastewater plants worldwide are upgrading sludge handling from open drying beds to anaerobic sludge digesters — sealed, heated vessels where microorganisms stabilize sludge, destroy pathogens, cut disposal mass, and generate biogas. Distributors who supply this equipment category face a demanding specification: the digester must be gas-tight, corrosion-proof against