(US5811289-A)      Milk industry effluent (I) is treated by:    (a) inoculating with a mixture (II) of bacteria and yeasts capable of living and growing in symbiosis in (I);    (b) aerating while at 0-50 C, pH 1.7-9;    (c) continuing step (b) until a suspended biomass generated by assimilation of milk products in (I) by (II) is achieved, and    (d) separating the biomass from residual interstitial water.    Also claimed is an apparatus for pretreating (I) comprising a reaction vessel equipped for a programmed and controlled aeration rate, dissolved oxygen detection, programmed acid metering into the vessel and a phase separation at the outlet.    ADVANTAGE -   The method is several hundred times faster than classical biological methods and produces a biomass of enhanced nutritional value for animal feed, and yields energy.    (EP885173-A1)      Milk industry effluent (I) is treated by:    (a) inoculating with a mixture (II) of bacteria and yeasts capable of living and growing in symbiosis in (I);    (b) aerating while at 0-50 C, pH 1.7-9;    (c) continuing step (b) until a suspended biomass generated by assimilation of milk products in (I) by (II) is achieved, and    (d) separating the biomass from residual interstitial water.    Also claimed is an apparatus for pretreating (I) comprising a reaction vessel equipped for a programmed and controlled aeration rate, dissolved oxygen detection, programmed acid metering into the vessel and a phase separation at the outlet.    ADVANTAGE -   The method is several hundred times faster than classical biological methods and produces a biomass of enhanced nutritional value for animal feed, and yields energy.    (EP885173-B1)      Milk industry effluent (I) is treated by:    (a) inoculating with a mixture (II) of bacteria and yeasts capable of living and growing in symbiosis in (I);    (b) aerating while at 0-50 C, pH 1.7-9;    (c) continuing step (b) until a suspended biomass generated by assimilation of milk products in (I) by (II) is achieved, and    (d) separating the biomass from residual interstitial water.    Also claimed is an apparatus for pretreating (I) comprising a reaction vessel equipped for a programmed and controlled aeration rate, dissolved oxygen detection, programmed acid metering into the vessel and a phase separation at the outlet.    ADVANTAGE -   The method is several hundred times faster than classical biological methods and produces a biomass of enhanced nutritional value for animal feed, and yields energy.