NOVELTY - A digester comprises a main tank (1) having biochemical treatment compartment (2) and chemical treatment compartment (3) connected by connecting pipe as a passage for biochemically treated waste to chemical treatment compartment. The biochemical treatment compartment has a one loosely fitted partitioned wall (5), inlet (6, 7) to receive waste, gas outlet (9, 10) and waste drain pipe to remove sludge. The chemical treatment compartment has siphon to discharge treated waste and excess of liquid, and float ball assembly to release chemical for chemical treatment.    USE - For on board treatment of human waste for railways, buses and other public transport systems.    ADVANTAGE - The digester is useful for the on board treatment of human waste for railways, buses and other public transport systems for converting it into the effluent which is odorless, free from pathogens and does not create any aesthetic nuisance. The digester provides onsite treatment of human waste avoiding the need for its transportation to the site of treatment. The digester having an anaerobic chamber has long path and time for biological treatment. The submerged inlet pipes prevent the entry of foul smelling gases from the head space to the toilet. The maintenance window on the side of fermentation chamber helps in removal of sludge and maintenance. The digester provides biochemical treatment of human waste with integrated chlorination chamber. In the process of human waste treatment, repeated addition of bacteria is not required and one time addition of the inoculum is sufficient.    DETAILED DESCRIPTION - A digester comprises a main tank (1) having biochemical treatment compartment (2) and chemical treatment compartment (3) connected by connecting pipe as a passage for biochemically treated waste to chemical treatment compartment. The biochemical treatment compartment has at least one loosely fitted partitioned wall (5) and at least one inlet (6, 7) to receive waste, at least one gas outlet (9, 10) and at least one waste drain pipe to remove sludge. The chemical treatment compartment has siphon to discharge treated waste and excess of liquid, and float ball assembly to release chemical for chemical treatment. The loosely fitted partitioned wall, inner sides and the bottom of the compartment are attach with polyvinyl chloride (PVC) sheets on at least one side.    DESCRIPTION OF DRAWING(S) - The figure shows an isomeric view of the digester.    main tank (1)    biochemical treatment compartment (2)    chemical treatment compartment (3)    partitioned wall (5)    inlet (6, 7)    gas outlet. (9, 10)