RU1820894C - Process for the treatment of oily wastes - Google Patents

Abstract

Usage: wastewater treatment (W) from oil products. SUMMARY OF THE INVENTION: CB treatment is carried out in a multi-chamber flotator with inclined partitions. In the process of cleaning, the angle of inclination of the partitions is changed depending on the degree of contamination of the source water. 1 tablet, 4 ill.

Description

The invention relates to the field of wastewater treatment from petroleum products and can be used for wastewater treatment in petroleum and chemical industries.

The aim of the invention is to increase the degree of purification and save coagulant.

Fig. 1 is a control diagram of the operation of the flotator: in Fig. 2 is a flotator, a side view in section: in Fig. 3 is a section aa in Fig. 2; figure 4 is a section bB in figure 2.

The control circuit of the operation of the flotator (Fig. 1) includes a sensor 1 for monitoring the oil content in the supply pipe 2, a flotator 3. comprising flotation chambers 4 and 5 and a settling chamber 6, a control unit 7, actuators 8, 9, a coagulant dispenser 10, a temperature control sensor 11 connected through block 7 to an optimum temperature maintaining device 12 in flotation chambers 4, 5. In chambers 4. 5 of the flotator 3, special mixing nozzles 13 with sockets 14 on the supply pipelines 2 and 15, inclined walls 16 forming the foam collecting and discharge chambers 17 are installed. Chambers 4. 5 are separated by a vertical partition 18. At the bottom of the flotation chambers 4 and 5, sludge collectors are located 19. The settling chamber 6 is separated from the chamber 5 by a partition 20 with a window 21 in the upper part, equipped with a transfer partition 22. A sorption filter 23 and cleaned piping 24 liquids. An oil sump 25 is adjacent to flotation chambers 4.5.

The method is carried out as follows.

The liquid to be cleaned, passing through the oil content sensor 1, through the supply pipe 2 enters the lower part of the first flotation chamber 4 through a special mixing nozzle 13 and a bell 14. The sensor 1 transmits information to the control unit 7, which controls the actuator 8. controlling the flow coagulant through dispenser 10 into nozzles 13 in accordance with the initial content of oil products in wastewater and the required degree of purification. In the flotation chamber 4, a temperature control sensor 11 is installed, which is connected through the control unit 7 to the device 12 to maintain optimal

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temperatures of the coagulation process in flotation chambers. Simultaneously with the supply of wastewater to the mixing nozzle 13 through special pipelines, air and coagulant are tangentially supplied. Intensive mixing of the water to be purified with the coagulant and its saturation with air occurs in the nozzle 13, the formation of flotation units in the form of a stable foam begins.

The formed water-air mixture under pressure exits the nozzle 13 through the bell 14, which changes the direction of flow and directs it along the inclined partition 16. The flotation chambers 4,5 represent a partially closed space limited by the inclined partition 16. having fractures at certain angles in horizontal and vertical plane x. At the top of the flotation chamber 4 there is a foam collecting and withdrawing chamber 17. The liquid level in the flotation chamber is set such that the foam formed from the foam is periodically discharged into the oil reservoir 25 as it is formed.

Upon exiting the nozzle 13 through the bell 14 in the liquid stream, the process of destruction of the emulsion and the formation of flotation units continues, and the separation of the liquid occurs. The resulting flotation units rise on the outside of the stream, reach the fracture of the inclined septum 16, and rush into the foam collection and discharge chamber 17. In the process of moving the external part of the flow, an important role is played by the angle of inclination of the partition 16. This is caused by the influence of this angle on the path length of the external part of the stream along the inclined plane. The smaller the angle, the greater the path that externally passes, the most saturated part of the stream with oil products, the longer the coagulant reacts with the liquid being cleaned. The necessary tilt angles of the inclined baffles 16 in the flotation chambers 4. 5 are set by the actuator 9 from the control unit 7, depending on the initial oil content and the required degree of purification.

Mechanical impurities under the action of gravitational forces gradually as the fluid moves along the inclined septum 16 settle to the bottom of the flotation chamber and collect in sludge collector 19, from where they are then removed outside the device.

The liquid to be cleaned, having reached the opposite c1RNA of the flotation chamber, is

tilted vertically, go around it. Under the influence of hydrostatic pressure, a new portion of the liquid to be cleaned is supplied to the flotation chamber 4 and squeezed out into the space above the inclined partition 16 and, along the vertical wall 18, is supplied to the second flotation chamber 5, where the flotation and coagulation processes are repeated.

From the flotation chamber 5, the clarified liquid flows through the holes in the baffle 20 into the settling chamber 6, where additional settling takes place. The movement of the liquid becomes laminar in nature, and the released mechanical impurities are collected in a sludge collector and then removed. Bend the vertical baffle 22, the liquid enters the sorption filter 23 and then

discharged from the device through the outlet pipes 24.

Example. This method has been tested in laboratory conditions, its efficiency and effectiveness have been confirmed.

For testing, a mixture containing petroleum products (AI-93 gasoline 20%, Me310 oil in 80%) 20% was taken. mechanical impurities (chalk, sand) 20%, industrial water 60%.

Petroleum products and mechanical impurities were in solution in a finely divided and suspended state. Aluminum sulphate (alumina) A12 (304) 18H20 was used as a coagulant.

Cleaning was carried out according to the technology indicated above. Wastewater was supplied to the flotation chambers, the necessary temperature conditions were maintained, depending on the required degree of purification,

made a change in the angle of inclination of the partitions. The experimental results are shown in the table.

Thus, the proposed method allows you to quickly and with a sufficiently high

the effectiveness of the purification of oily wastewater.

Claims (1)

SUMMARY OF THE INVENTION A method for treating wastewater from petroleum products in a multi-chamber flotator with inclined baffles, comprising an adjustable supply of coagulant, removal of flotation sludge and purified water, characterized in that. with the aim of increasing the degree of purification and saving of coagulant, in During the cleaning process, the angle of inclination of the flotator baffles is changed depending on the degree of contamination of the source water. / 7 eighteen L Fi g g o g / yy / / figz ShchigA