NOVELTY - The apparatus has a dehumidification portion (2A) which is positioned in heat exchange pipe in which low-temperature water flows relatively, so that air is sent to heating portion (2B) while flowing in air sent from outflow port (out) of drying chamber (1A). The heating portion is positioned in heat exchange pipe in which hot water flows relatively, so that air is sent out to inflow port of drying chamber while flowing in air sent from dehumidification portion.    USE - Evaporation drying apparatus of waste liquid.    ADVANTAGE - The evaporation drying is performed efficiently by combining the mechanical solid-liquid separator structure which does not use heat energy. The mechanical solid-liquid-separation process is performed to compresses the absorber which absorbed the waste liquid, while making solid portion adhere to absorber in efficient manner.    DETAILED DESCRIPTION - The returning unit is provided to return the absorber from which the liquid portion is separated by the solid liquid separation unit to the start edge portion of movement path. The unit returned to the start edge portion of movement path is provided so as to made the absorber absorb again liquid portion separated by solid liquid separation unit. The taking out unit takes out absorber to which solid content after liquid portion is separated by solid-liquid separation unit adhered to exterior of drying chamber. The unit to disconnect solid content adhering to adsorbent taken out outside is provided. A unit to return absorber that detached solid content to start edge portion of movement path in drying chamber is provided. The waste liquid is provided as digestive liquid which arose in the biogas plant and the water of high temperature relatively is the water heated by CHP by biogas plant.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view illustrating the structure and main working process of evaporation drying apparatus of waste liquid. (Drawing includes non-English language text)    Drying chamber (1A)    Dehumidification portion (2A)    Heating portion (2B)    Liquid recovery portion (4)    Outflow port (out)