Patent ID: 7163631

Claim:
A method for treating wastewater containing peracetic acid, which comprises the following steps: a. aerating or mechanically agitating wastewater containing peracetic acid in a tank without an addition of sludge to decompose the peracetic acid contained therein, wherein said wastewater containing peracetic acid is a wastewater generated from washing pipelines or containers in a food plant; b. carrying out an aerobic treatment in the resulting water from step a) having a reduced content of peracetic acid to decompose organic compounds therein; and c. recovering the treated water from step b) as reusable water, when said aerobic treatment is carried out by using attached sludge; or subjecting the treated water from step b) to a solid-liquid separation to obtain reusable water having a reduced suspension solid content therein, when said aerobic treatment is carried out by using a suspended biological sludge, wherein said reusable water can be recycled or discharged.