BioPasteur™ Sludge Treatment

The BioPasteur™ process utilises heat exchangers and batch pasteurization tanks to meet US EPA Class A pathogen reduction conditions. The BioPasteur system is used in combination with an anaerobic digestion system in a two-stage process. In the first stage, the BioPasteur system heats the biosolids to 75ºC for more than 30 minutes to provide pathogen destruction. Continuous flows of sludge are maintained through the sequential batch operation of the pasteurization tanks. In the second stage, the anaerobic digestion system provides volatile solids reduction at either thermophilic or mesophilic operating temperatures. The heat exchanger unit can be expanded to incorporate heat recovery from thermophilic digestion. The BioPasteur is a simple retrofit for sites with existing anaerobic digestion systems.