Patent ID: 7867397
Filing Date: 2011-01-11
Classification: C02F,Y02W

Abstract:
1. A method for purifying wastewater loaded with organic matter, said method comprising a step of bringing the wastewater into contact with a biological culture containing a purifying biomass and a separation step carried out by filtration through organic or inorganic membranes, wherein at least part of said biological culture is subjected to an oxidative stress step enabling a liquor to be obtained by the action of ozone used in small amount, in a proportion of from 0.1 mg to 8 mg of ozone per gram of solids of the effluent to be treated, so as to preserve the biological activity of the purifying biomass while at the same time modifying the structure of the microbial floc so as to make it more dense, and wherein the pH is always between 6 and 9, limits inclusive.