METHOD AND DEVICE FOR TREATMENT OF WATER Russian patent published in 2003 - IPC

FIELD: methods of treatment of sewage, domestic and industrial waste water; chemical, wood-working, food-processing, oil refining and other industries; metallurgy. SUBSTANCE: proposed method is used for cleaning water from such components as compounds of alkali, alkali- earth, transition, heavy and radioactive elements, petroleum products, colloidal particles, organic compounds including dyes, high-molecular agents and surfactants, as well as for thickening sludge and reducing moisture content in it. Water to be treated is subjected to electric coagulation with flocculant and activating additive at mass ratio of activating additive to coagulant with flocculant equal to 0-500 parts by mass. Water is also treated with elastic oscillations at intensity ensuring realization of cavitation in water at level of cavitation noise in frequency range from 500 to 500000 Hz not below 50 dB over entire volume of reactor and acoustic macro- and micro-flows at rate no less than 1% of oscillatory velocity of surface transmitting elastic oscillations to liquid. Solid phases of suspension formed in the course of treatment are separated. Water is treated by all said methods simultaneously in combined mode. According to second version of invention, degree of treatment of water is increased. Device proposed for realization of this method includes reaction chamber whose geometric sizes are dictated by conditions of its acoustic resonance on working surface of ultrasonic oscillations. Inner surface of reaction chamber wall is one of cathodes of electrochemical cell and tube mounted in center of reaction chamber is used as other cathode; perforated tube mounted coaxially between cathodes and secured on reaction chamber performs function of anode. Mounted on central tube is hydrodynamic transducer. On the outside of reaction chamber on two sides from it at least one pair of ultrasonic transducer units is secured in one axis perpendicular to axis of reaction chamber. Water, coagulant with flocculant and liquid activating additive supply systems and foam-like sediment discharge branch pipe are connected to reaction chamber through acoustic decoupling unit and hydrodynamic transducer. Cleaned water discharge chamber is connected at the top of reaction chamber through acoustic decoupling unit and gaseous activating additive supply system is connected at the bottom. EFFECT: enhanced efficiency of cleaning water; reduced consumption of reagents; reduced power requirements. 16 cl, 1 dwg, 4 ex