Abstract: A self-contained biomass generator configured for use in growing and discharging bacteria at or near an intended use site and having a housing containing a bacteria growth chamber; water and air inlets; receptacles and solenoid pumps for liquids containing bacteria spores, nutrient, defoamer and disinfectant; a recirculation pump; air pump; water heater; manifold; a dosing pump configured to dispense controlled amounts of bacteria; and a programmable electronic controller configured to operate the device through a plurality of bacteria growth cycles and to disinfect the wetted internal surfaces between growth cycles without requiring service or operator intervention. A process for using the biomass generator is also disclosed.