WATER TREATMENT SYSTEM AND WATER TREATMENT METHOD

摘要

A water treatment system comprising an anaerobic reactor (10) for decomposing organic pollutants in wastewater by the action of an anaerobic microorganism a trickling type aerobic reactor (12) packed with a filler to which microorganisms are to be attached said trickling type aerobic reactor being provided after the anaerobic reactor for trickling water to dissolve oxygen in the atmosphere therein and thus supplying oxygen and a membrane bio reactor (13) said membrane bio reactor being provided after the anaerobic reactor equipped with a separation membrane for solid liquid separation that is placed in a biological reaction tank wherein in treated water having been treated with the anaerobic reactor a portion corresponding to the amount required as reclaimed water is treated with the membrane bio reactor while the remainder is treated with the trickling type aerobic reactor.