WATER TREATMENT METHOD AND DEVICE

摘要

A water treatment method and a water treatment device therefor are provided for treating backwash wastewater, washing wastewater, recirculating water or concentrated water in a membrane separation device and using the same as cooling water in a cooling tower. After filtering with a filter 30, blowdown water of the cooling tower 1 is subjected to treatment in a pretreatment membrane device 33 such as an MF membrane, is subsequently to treatment with a reverse osmosis membrane device (an RO membrane device) 38, and the RO treated water is returned to the cooling tower 1. Washing wastewater, backwash wastewater and concentrated water from the pretreatment membrane device 33 and the RO membrane device 38 are returned to a water piping 11 leading to a side filter 14.