NOVELTY - A waste water treatment system produces sludge with variable moisture content which is dried by air. Initial drying stage takes place at up to 70-80(C and the material continues to dry until incineration is possible without the use of supplementary energy.    USE - Process and assembly to dispose of sewage sludge and waste water treatment sludge by drying and incineration.    ADVANTAGE - The process and assembly provide an efficient means of sludge disposal suitable for use at decentralised locations.    DETAILED DESCRIPTION - During the drying process water is evaporated without release of odours. The dried sludge is held several times in intermediate storage, and is subsequently subjected to a series of thermal treatment stages. Effluent gases are cleaned by dust filtration and adsorption. Effluent heat is surrendered via an exchanger as heat and for the generation of electricity. Also claimed is a commensurate assembly with a wet sludge storage container (1), a low-temperature drying system (2) and dry sludge intermediate storage hoppers (3, 5) and a single or multi-stage thermal treatment system (7, 8). Effluent gases arising from incineration are cleaned in a first-stage dust filter (10) and by water in a second-stage adsorption washer. Energy is recovered (9) from hot gases pref. prior to the gas cleaning stages (9, 10).    DESCRIPTION OF DRAWING(S) - The drawing is a flow chart of the process. (Drawing includes non English-language text).    Wet sludge holding tank (1)    drier (2)    buffer storage units (3, 5)    conveyer (4)    first-stage thermal treatment (7, 8)    heat exchanger (9)    dust separator (10)    secondary gas cleaning system (11)    dry sludge input (A)    total water input (B)    total air input (C)    energy user points (E)    natural gas (F)    optional foul gas (G)    heat transport medium (H)    warm water for internal purposes (I)    warm water for external purposes (J)    electricity (K)    water jets (L)    separate gas components (M)    effluent gas (N)    sub-flow discharge (X)