METHOD OF RECYCLING ANIMAL WASTES TO PRODUCE MODIFYING ADDITIVE FOR ROAD BITUMEN Russian patent published in 2025 - IPC B09B3/70 C09D195/00 

FIELD: technology of processing animal wastes.

SUBSTANCE: disclosed is a method of recycling pig wastes to produce modifying additives for road bitumen, which includes thermal treatment of wastes in an alkaline medium, wherein treatment process is carried out in aqueous solution of sodium hydroxide in presence of sodium sulphate at mixture temperature of 100±5 °C for 1±0.1 hours , followed by separation of solid and liquid fractions, wherein liquid fraction is subjected to evaporation at temperature 70±5 °C until achieving viscous-flow state, and the solid fraction is washed from the alkaline medium and dried to obtain a constant mass at temperature of 95±5 °C, with following ratio of components, wt.%: distilled water 81.0±0.1; sodium hydroxide 6.5±0.1; sodium sulphate 3.0±0.1 and solid fraction of pig manure 9.5±0.1.

EFFECT: recycling pig waste, achieving improved operational characteristics of bitumen for road construction, high quality of the road surface and reduced environmental risks for livestock farming enterprises.

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