NOVELTY - Stabilizing biosolids involves pumping sludge through a heat exchanger, to raise temperature of the sludge to a pasteurization temperature range; continuously flowing the raised temperature sludge along a path through a detention tank from an input to an output, where the sludge at the input and the output is within the pasteurization temperature range, and the sludge undergoes pasteurization in the detention tank; and then separating the sludge into stabilized biosolids and effluent.    USE - Used for stabilizing biosolids (claimed) useful in domestic/industrial wastewater and sewage treatment; to form stabilized biosolids useful as fertilizer and applied as a soil amendment to public areas such as vegetable gardens, lawns and playfields.    ADVANTAGE - The method produces exceptional quality biosolids, which meet the time and temperature standards of pathogen reduction for anaerobic digestion, and which are considered safe for recycling. The continuous flow of the sludge at pasteurization temperature range, through the detection tank, for a prescribed time, stabilizes the sludge. The method stabilizes biosolids with small footprint, destruction of volatile solids, vector attraction reduction and pathogenic organism kill-off. The pasteurization and the mesophyllic digestion in cool down tank, provides increased production of methane gas as byproduct.    DETAILED DESCRIPTION - Stabilizing biosolids involves pumping sludge through a heat exchanger to raise temperature of the sludge to a pasteurization temperature range; continuously flowing the raised temperature sludge along a path through a detention tank from an input to an output, where the sludge at the input and the output is within the pasteurization temperature range, and the sludge undergoes pasteurization in the detention tank; and then separating the sludge into stabilized biosolids and effluent. The method preferably involves performing mesophyllic anaerobic digestion on the sludge, by flowing the sludge through a mesophilic digestion tank, to achieve the sludge for pumping. The sludge preferably undergoes an anaerobic thermophyllic digestion process and pasteurization, in the detention tank. The method further involves receiving the sludge into a cool down tank, after the flowing of sludge through detention tank and prior to the separation, for performing mesophyllic anaerobic digestion on the sludge in the cool down tank.    An INDEPENDENT CLAIM is included for a system for stabilizing biosolids comprising a positive displacement pump for continuous flowing of a sludge along a path; two spiral heat exchangers for elevating and maintaining temperature of the sludge within the pasteurization temperature range; and a detention tank having a channel defining a portion of the sludge flow path, where the sludge is in the detention tank for a specific time and at a specific temperature.    DESCRIPTION OF DRAWING(S) - The figure shows a block diagram of a system for performing continuous flow wastewater treatment.