Patent ID: 8597520
Filing Date: 2013-12-03
Classification: C02F

Abstract:
1. A wastewater treatment method in which magnetic flocs are formed by adding to wastewater an inorganic flocculant, magnetic particles, and a high molecular polymer as a polymeric flocculant, and the magnetic flocs are collected with magnetic force to thereby obtain treated water having the magnetic flocs removed from the wastewater, comprising: adding the inorganic flocculant to the wastewater in a rapid stirring tank to flocculate suspended solids in the wastewater, discharging the wastewater with flocculates of the suspended solids from the rapid stirring tank, adding the magnetic particles to the wastewater with flocculates of the suspended solids after the wastewater with flocculates of the suspended solids is discharged from the rapid stirring tank, after or substantially at the same time as the magnetic particles are added to the wastewater with flocculates of the suspended solids, adding the high molecular polymer to the wastewater, whereby flocculates of the suspended solids and the magnetic particles are combined with each other with the high molecular polymer in a slow stirring tank to thereby obtain the magnetic flocs.