Treatment apparatus, in particular dehumidification apparatus, comprising: - at least one container of incoherent plastics, said container comprising at least one plastics inlet, at least one plastics outlet, at least one process gas inlet and at least one process gas outlet; - at least one supply line for supplying a process gas to said process gas inlet of said container; - at least one flow generator for generating a process gas flow along said supply line towards said container; - at least one condenser arranged along said supply line for condensing contaminating vapors contained in the process gas flow, said condenser comprising at least one contaminated gas inlet and at least one purified gas outlet; - at least one exchanger arranged along said supply line for cooling the process gas flow, said exchanger comprising at least one gas to be cooled inlet, at least one cooled gas outlet, at least one cooling gas inlet and at least one heated gas outlet; wherein said supply line comprises at least one connection portion which connects said cooled gas outlet with said contaminated gas inlet, at least one recirculation portion which connects said purified gas outlet with said cooling gas inlet, and at least one delivery portion which connects said heated gas outlet with said process gas inlet of said container; characterized in that said condenser comprises evaporator means in which a cooling flow circulates to cool the process gas flow, and in that said treatment apparatus comprises sensor means for detecting condensate formed by said evaporator means and control means configured to adjust said cooling flow based on signals provided by said sensor means. - at least one container of incoherent plastics, said container comprising at least one plastics inlet, at least one plastics outlet, at least one process gas inlet and at least one process gas outlet; - at least one supply line for supplying a process gas to said process gas inlet of said container; - at least one flow generator for generating a process gas flow along said supply line towards said container; - at least one condenser arranged along said supply line for condensing contaminating vapors contained in the process gas flow, said condenser comprising at least one contaminated gas inlet and at least one purified gas outlet; - at least one exchanger arranged along said supply line for cooling the process gas flow, said exchanger comprising at least one gas to be cooled inlet, at least one cooled gas outlet, at least one cooling gas inlet and at least one heated gas outlet; wherein said supply line comprises at least one connection portion which connects said cooled gas outlet with said contaminated gas inlet, at least one recirculation portion which connects said purified gas outlet with said cooling gas inlet, and at least one delivery portion which connects said heated gas outlet with said process gas inlet of said container; characterized in that said condenser comprises evaporator means in which a cooling flow circulates to cool the process gas flow, and in that said treatment apparatus comprises sensor means for detecting condensate formed by said evaporator means and control means configured to adjust said cooling flow based on signals provided by said sensor means.