PURPOSE:To make it possible to effectively carry out concentrating treatment, by continuously concentrating a distillation waste liquor of SHOCHU (low-class distilled spirit) in each concentration apparatus and utilizing steam generated in the heat treatment as a heat source for the succeeding heaters one after another. CONSTITUTION:Plural concentration apparatuses (A1)-(A3) and gas-liquid separators (B1)-(B3) are connected and combined one after another. Pumps (P1)-(P3) are provided in liquid feed pipes 9 connected to the bottom of each heater and many heating pipes 5 for flowing a distillation waste liquor of SHOCHU (low-class distilled spirit) are provided in the interior of the heater. The diameter of the heating pipes 5 is set in relation to the above-mentioned pumps (P1)-(P3) so that the flow velocity in the heating pipes 5 may be 0.1-1.0m/sec. Concentration while heating is successively carried out in each concentration apparatus and the concentrated liquid is then fed into the succeeding concentration apparatuses at the same time. The generated steam is fed for utilization as a heat source for the succeeding concentration apparatuses to carry out continuous concentration treatment. As a result, the concentration treatment of the distillation waste liquor of the SHOCHU can be efficiently carried out without causing sticking of solid materials, etc., or scorching.
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