NOVELTY - An anaerobic treatment system (100) comprises a receiving tank (105) for receiving the substrate to be treated and generating a slurry together with a liquid; a first digester tube (115) in liquid communication with the receiving tank for receiving the slurry for storage/hydrolysis; and a drainage system (146) in communication with outer bag of digester tube, where the draining system comprises a drain valve operable in a closed position for preventing draining of the outer bag and in an open position for draining the outer bag of leachate.    USE - As an anaerobic treatment system for treating organic substrate (claimed), seasonal organic waste, livestock manure such as poultry manure, protein rich substrates producing elevated levels of ammonium inhibiting the anaerobic digestion process, substrates containing heavy metals; and for storage/hydrolysis, methanization and digestate treatment.    ADVANTAGE - The system is inexpensive; converts carbon compounds into carbon dioxide, thus avoiding generation of methane in an aerobic reaction; and allows anaerobic digestion, dewatering and storage of the sewage sludge in a single step.    DETAILED DESCRIPTION - An anaerobic treatment system (100), comprises a receiving tank (105) for receiving the substrate to be treated and generating a slurry together with a liquid; a first digester tube (115) in liquid communication with the receiving tank for receiving the slurry for storage/hydrolysis, where the first digester tube comprises an inner bag permeable to gas and liquid and impermeable to solids, outer bag housing the inner bag such that gas and liquid leaches from the inner bag to the outer bag, where the outer bag is impermeable to gas and liquid; and a drainage system in communication with the outer bag, where the draining system comprises a drain valve operable in a closed position for preventing draining of the outer bag and in an open position for draining the outer bag of leachate, where when the drainage system is closed, the slurry in the first digester tube is separated into leachate collected in the outer bag and substrate collected in the inner bag. An INDEPENDENT CLAIM is included for anaerobically treating organic substrate involving placing the substrate in an anaerobic environment; separating a fluid and gas component from the organic substrate to adjust the pH of the substrate to a suitable level for treatment; and storage, hydrolyzing, methanizing or treatment of the substrate.    DESCRIPTION OF DRAWING(S) - The figure shows single line view of anaerobic treatment system.    Anaerobic treatment system (100)    Receiving tank (105)    Drainage collection tank (110)    Digester tube (115)    Drainage system (146)