The IBES system incorporates various options. These include IBES – AD, IBES – AD2, IBES – ADG, and IBES – G.

Anaerobic digestion

The heart of the IBES system incorporates a highly efficient two phase anaerobic digestion system.  Utilization of an acid-methane phase system optimizes volatile solids destruction and maximizes the production of biogas.  Biogas is scrubbed and fed to generators, where the resultant heat and electrical energy are utilized to satisfy the energy demands of the digestion process.  Class A biosolids are ready to be land applied or further processed via add-on thickening, dewatering, or drying modules.

Anaerobic digestion, drying

This system adds a drying component to the base IBES system.  Should the drying of biosolids be advantageous, the IBES – AD2 can produce pelletized or granular dried solids in a manner which will provide a fast return on investment.  HESCO’s patented heat utilization strategy is able to achieve up to 90% dried solids with no input of auxiliary energy other than that which is produced from the anaerobic digestion process.

Anaerobic digestion, gasification

In order to maximize energy production and minimize biosolds disposal costs, HESCO recommends the ADG vesion of the IBES.  This process converts the digested sludge to a synthesis gas which is burned to produce heat which is in turn fed to an air turbine to produce electricity.


This version of the IBES integrates combined heat and power (CHP) principles t condition raw sludge in a manner which utilizes no auxiliary input of fuel and feeds the sludge into a gasification system which converts the sludge to a synthesis gas which is burned to produce heat.  Hot air is fed to an air turbine to produce electricity.