DESALTED WATER RECOVERY DEVICE, WATER TREATMENT SYSTEM, AND WATER TREATMENT METHOD

摘要

To provide a desalted water recovery device which does not need dilution water from outside when biologically treating treatment water containing chloride ions, a water treatment system, and a water treatment method.SOLUTION: A desalted water recovery device 3 of this invention is provided in a subsequent stage of a biological treatment device 2 that biologically treats treatment water containing chloride irons and recovers desalted water from the treatment water subjected to the treatment in the biological treatment device 2. A water treatment system 1a and a water treatment method using the water treatment system of this invention recycle and return the desalted water recovered in the desalted water recovery device 3 to the biological treatment device 2.SELECTED DRAWING: Figure 1