SEWAGE SLUDGE PRETREATMENT METHOD Russian patent published in 2023 - IPC C02F11/06 C02F11/15 

FIELD: physical and chemical technologies in ecology.

SUBSTANCE: invention relates to the combined treatment of domestic wastewater sludge in order to transform them into soil or fertilizer. According to the method, the sewage sludge is affected by acoustic waves and ozone sprayed into the liquid medium. The impact is carried out by acoustic waves in the frequency range of 12-44 kHz and a power density of 0.1-1 W/cm³ sufficient to overcome the cavitation threshold. Exposure to acoustic waves and spraying of ozone in the form of cavitating microbubbles is carried out by means of a hydroacoustic emitter.

EFFECT: expansion of methods for pre-treatment of sewage sludge for the possibility of their further use.

1 cl, 3 ex