METHOD FOR ADJUSTING CONCENTRATION OF COOLING WATER TREATMENT AGENT IN CIRCULATING COOLING WATER SYSTEM, METHOD FOR RECOVERING DISCHARGED COOLING WATER, AND TREATMENT DEVICE FOR DISCHARGED COOLING WATER

摘要

The present invention reduces the water treatment cost while increasing and stabilizing the water recovery rate when a water recovery system using a separation membrane recovers discharged cooling water, such as blow water from a circulating cooling water system. This circulating cooling water system, into which a cooling water treatment agent is added, is provided with a water recovery system that uses a separation membrane to treat discharge water from the circulating cooling water system, and returns the treated water to the circulating cooling water system. In this circulating cooling water system, the concentration of the cooling water treatment agent in the circulating cooling water system is adjusted in accordance with changes in performance of the separation membrane in the water recovery system.