METHOD AND INSTALLATION FOR CONTROLLED MICROBIOME SHIFT FOR BIOMASS DENSIFICATION IN A BIOLOGICAL TREATMENT OF A RAW INFLUENT

The invention provides a method for controlled biomass densification in a biological treatment of a raw influent, characterized in that it comprises:- A step of subjecting the raw influent to a biological treatment of free suspended biomass, thereby producing a biomass comprising activated sludge;- A step of separation and/or clarification of the activated sludge, thereby producing an effluent and a RAS;- A step of extracting at least part of the RAS and/or part of the activated sludge as a first source of a WAS;- A step of external density-based selection of at least part of the RAS and/or part of the activated sludge, thereby generating an overflow intended to be extracted as a second source of WAS, and an underflow comprising dense biomass aggregates;- A step of producing and/or sustaining dense biomass aggregates, such as aerobic granular sludge or biofilm, by a dense biomass aggregates generating process, with at least part of the raw influent;- A step of subjecting the dense biomass aggregates to the biological treatment;- A step of subjecting the dense biomass aggregates of the underflow to the biological treatment and/or to the dense biomass aggregates generating process;thereby obtaining a densified biomass.