| 摘要 |
<p>Provided is a water treatment device, particularly a water treatment device for fresh water production utilizing a semipermeable membrane, the water treatment device being for obtaining treated water from multiple kinds of water to be treated, wherein the environmental impact of the waste water is small, there is little contamination of the separation membranes, washing frequency and disinfectant cost are low, and stable operation is possible. The water treatment device is characterized: in comprising a pre-treatment unit (X) for pre-treating the water to be treated (A), a membrane separation unit (Y) for separating a portion (B1) of the treated water (B) into permeate (C1) and concentrate (C2), and a membrane separation unit (Z) that separates a water mixture in which at least a portion (B2) of the remainder of the treated water (B) is mixed with a water to be treated (D), which differs from the water to be treated (A), into permeate (E1) and concentrate (E2); and in comprising a line for returning at least a portion of the concentrate (C2) to the pre-treatment unit (X).</p> |
