SU1289824A1 - Method of waste water treatment - Google Patents

Abstract

The invention relates to the field of wastewater treatment from contamination and microorganisms by the method of combined exposure to ultrasound and ozone. The proposed method can be used for the treatment of wastewater from animal enterprises, for example, for the purification of wastewater from pig breeding complexes and slaughterhouses, and allows an increase in the degree of wastewater treatment of livestock breeding complexes. For carrying out the process, the wastewater is treated with ultrasound and ozonized, and the ultrasonic treatment is carried out at a pressure below atmospheric, preferably 20-70 kPa and ozonation at a pressure higher than atmospheric, preferably 20-100 kPa, and part of the treated water / 3-2 / 3 served to mix with the original water. The method allows to achieve the following indicators of the estimated water of livestock-raising complexes: transparency 20 cm, suspended solids 46 mg / l, COD 250 mg / l, DIC 42 mg / l. 2 3.p. f-ly. and S (Л с ьг 00 со 00 ю 4

Description

The invention relates to the purification of exact waters from contamination, knowledge and microorganisms by the method of combined ultrasound and ozone, and can be used to purify the exact waters of livestock breeding plants, for example, after purification of waste waters of pig breeding complexes, slaughterhouses.

The purpose of the invention is to increase the degree of wastewater treatment of livestock-raising complexes.

Example 1. Wastewater treatment of a pig-breeding complex is carried out for 108 thousand heads per year with the following initial indicators: pH 6.9, suspended substances 250 mg / l, COD 2080 mg / l, VPK 5595 mg / l, total microbial content bodies 8-10, manure smell, limit of feeling at 60-fold dilution in distilled water. When starting the system, the compressor is turned on and the suction line of the compressor is connected to the hermetic chamber of the ultrasonic treatment chamber using an automatic electro-valve. Under the action of vacuum, waste water is fed into the ultrasonic treatment chamber through the suction pipe. After filling the chamber with sewage up to the level of the sensor, the circulation pump, the ultrasonic generator and the ozonizer are automatically switched on, and the electro-valve turns off and overlaps the communication between the cavity of the chamber and the compressor suction line. The vacuum in the ultrasonic treatment chamber is maintained by installing it above the level of the circulation pump that pumps the effluent from the chamber to the ozonation column. Ultrasonic waste treatment is performed at a frequency of 20.5 kHz with a radiation intensity of 12.5 W / cm and a chamber pressure 50 kPa below atmospheric. The level of effluent in the chamber is maintained by suction of gases from the cavity with the automatic activation of the solenoid valve. The sonicated wastewater is fed to the ozonation column, where the ozone-air mixture with an ozone concentration of 22.3 mg / l is simultaneously directed, and the excess pressure is maintained 60 kPa above atmospheric pressure inside. From the ozonation column, water is supplied to a peyogasitel, from where half

sent to the exit from the system, and half back to the inlet for mixing with the initial drains when they enter the ultrasonic treatment chamber. An ozone-air mixture is obtained from air in a tubular type ozonizer with water, cooling and a working voltage of 10 kV, current frequency 50 Hz. The ozonizer line is a conventional flow chart and consists of air filters, a compressor, a cooler, an air dryer and an ozonizer. Magnetic tostrictive emitters feed

energy ultrasonic frequency from the generator.

As a result of wastewater treatment, the method allows to achieve the following: indicators: transparency 20 cm, suspended substances 46 mg / l, COD 250 mg / l, VPK g 42 mg / l, odor intensity threshold at 10-fold dilution with distilled water.

PRI mme R 2. Perform wastewater treatment of a pig-breeding complex with a capacity of 108 thousand heads per year according to a known method, namely, the wastewater is fed into the ultrasonic treatment chamber, exposed to ultrasound at a frequency of 20.5 Hz, intensity of 12.5 W / cm after atmospheric pressure, they are sent after sonication to an ozonation column and treated with an ozone-air mixture with an ozone concentration of 22.3 mg / l and a mixture flow rate of 3.5 m / h at atmospheric pressure on the surface of the ozonated liquid.

The ozone-treated wastewater is sent to a sump,

As a result of treatment with an installation capacity of 1.15, a level of deodorization is obtained, which corresponds to a threshold odor intensity at 30-fold dilution of treated effluents in distilled water. Microbial number is 50.tys / ml. Transparency 12 cm, COD

310 mg / l, MIC 568 mg / l.

From the data of examples 1 and 2 it follows that the proposed method allows to improve the quality indicators of the purified water of livestock-raising complexes.

Claims (2)

1. The method of wastewater treatment by ultrasonic treatment with 3 12898244 following ozonization, with tl and - 2. A method of pop, 1, distinguished by the fact that, with the aim of Increasing the degree of sewage treatment with ultrasound is carried out at pressured livestock complexes. NII at 20-70 kPa below atmospheric, sonication is carried out5 ozonization at a pressure of 20 at a pressure below atmospheric, a100 kPa higher than atmospheric, the subsequent ozonization at pressure 3, the method according to claim 1, about tl and the reading of the above atmospheric, and with a part of the treated water is fed to the mixed with the source water is fed 1 / 3-2 / 3 hugs with the original., treated water.