Patent ID: 9255023
Filing Date: 2016-02-09
CPC Classification: C02F

Claim Text:
1. A method for treating contaminated impound agricultural water, the method comprising: providing contaminated impound agricultural water containing metal ion and organic species contaminants to be removed; treating the contaminated impound agricultural water with ferric iron ions, thereby generating a ferric-treated mixture; reducing the ferric iron ions to form ferrous iron ions by flowing the ferric-treated mixture through an upflow reactor filled with iron filings or steel wool with a contact time of 10 to 30 minutes, thereby generating a ferrous-treated mixture; removing the ferrous-treated mixture from the upflow reactor; treating the ferrous-treated mixture with an oxidant, thereby generating an oxidized mixture, wherein the ferrous iron ions catalyze an oxidation activity of the oxidant; adding an inorganic coagulant and a low molecular weight cationic polymer to the oxidized mixture to increase a physical size of contaminants and particulates and to form flocculent particles with low tackiness, thereby generating a flocculent mixture; and microfiltering the flocculent mixture to remove the flocculent particles, thereby generating a microfilter effluent.