WATER TREATMENT SYSTEM AND WATER TREATMENT METHOD

摘要

This water treatment system comprises: a reverse osmosis device (2); a biological membrane treatment device (4) that has a carrier on the surface of which a biological membrane is formed and that treats water to be treated (3) before passing through the reverse osmosis device (2); an oxidizing agent addition device (5) that adds an oxidizing agent to the water to be treated (3) at a stage before treatment with the biological membrane treatment device (4) or adds an oxidizing agent to the water to be treated (3) at a later stage after treatment with the biological membrane treatment device (4) and before treatment with the reverse osmosis device (2); and a reducing agent addition device (6) that neutralizes the oxidizing agent by adding a reducing agent to the early stage water to be treated (3) or the later stage water to be treated (3).