| 摘要 |
PURPOSE:To increase the amount of reutilizable water recovered from a waste liquid to a large extent, by applying cooling treatment to the concentrate of an ultrafilter (UF) prior to again applying filtering treatment to the concentrate concentrated by a reverse osmosis filter (RO) by UF and RO without discarding the same as it is. CONSTITUTION:The concentrate separated by UF is stored in a tank 12 through pipes 10, 11 and the filtrate from UF is stored in a tank 15 through a pipe 13, a tank 14 and a pipe 16. The filtrate stored in the tank 14 passes through a pipe 18 and applied to ROs 19, 20. The filtrates from ROs 19, 20 are stored in a tank 28 as reutilizable water through pipes 26, 27, 25. The concentrates from ROs 19, 20 are again applied to RO23 and the filtrate thereof is stored in a tank 28 through pipes 24, 25 while the concentrate from RO23 is cooled by a cooler 30 through a pipe 29 to be returned to a tank 2 and again recirculated to UF and RO to receive filtering.
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