Wastewater treatment equipment for treated water as a substitute for hexavalent chromium and its method

摘要

There is a risk that impurities (other process components) may be mixed in each process water washing tank when the ion exchange tower is saturated, and a product is defective when impurities exceed a specified amount in the surface treatment main tank. A non-drainage treatment apparatus for treated water intended to replace hexavalent chromium capable of solving the above problem and a method thereof. SOLUTION: A non-drainage treatment apparatus for treated water intended to replace hexavalent chromium performs distinction between water washing in a primary water washing tank and a secondary water washing tank. In secondary water washing for low concentration, the treated water (raw water) Considering the liquid quality of the contents, the four ion exchange water passages are subdivided, and each channel is individually and optimally treated. Even in the saturated state of the four systems of ion exchange resins, impurities are not mixed into other processes. In primary water washing for high concentration, continuous drainage treatment is performed, and SS substances such as metal hydroxides produced by the addition of auxiliary agents and pH adjustment (using MF membrane) are converted into high concentration SS substances and treated water. Separate and use the treated water for secondary washing. [Selection] Figure 1