SU1096231A1 - Electrical flotation apparatus - Google Patents

Abstract

ELECTROFLOTATION APPARATUS for cleaning industrial wastewater from petroleum products, containing an input chamber, a flotation cell with discretely located electrode blocks, a foam collector, and an output chamber, characterized in that in order to increase the degree of purification and reduce energy costs by reducing the deposition of hardness salts, the anode the electrode unit is made in the form of a graphite cylinder, around which cathodes made of wire, mounted with tension and connected to the source of the pulsating current with a pulsation frequency of 25-50 Hz. with Ot) yu

Description

The invention of technologies for the treatment of wastewater, namely, devices for the treatment of oil-containing wastewater, and can be used in the oil and chemical industries.

A sewage treatment apparatus is known in which there are three chambers s a stream introduction chamber, a flotation chamber itself and a stream outlet chamber. In the flotation cell, CUJ is located at the bottom. Refluxed sludge serves as a filter bed, P71I of purified water C1 3 "

The disadvantages of such an apparatus are its large size, as well as the fact that when filtering water through sludge, an undesirable effect of the transfer of contaminants into the treated water is observed, which will impair the quality of cleaning.

The closest to the proposed technical essence and the achieved effect is an electro-flotation apparatus for purifying waste water from petroleum products, containing an input chamber, a flotation cell with discretely located electrode blocks, a foam collector and an output chamber 23.

However, the known device is characterized by an insufficiently high degree of purification and high power consumption due to the deposition of hardness salts on the cathode.

The purpose of the invention is to increase the degree of purification and reduce energy consumption due to the reduction of the hardness salt deposition.

The goal is achieved by the fact that in an electro-flotation apparatus for purifying industrial wastewater from petroleum products containing an input chamber, a flotation cell with discretely arranged electrode blocks, a collecting device and an output chamber, the anode of the electronic block is made in the form of a graphite cylinder around which the pairs are coaxially arranged cathodes made of wire, installed with tension and connected to the source of a pulsed current with a pulsation frequency of 25-50 Hz,

FIG. 1 is a diagram of the apparatus in FIG. 2 - electrode assembly; Fig, 3 - section of the electrode assembly

The electro-flotation apparatus {Fig. 1 consists of a rectangular Form MDd housing 1, in which the flow entry chamber 2, the flotation chamber 3, the flow outlet chamber 4 are located. The flow entry chamber 2 and the flotation chamber 3 are separated by a vertical partition 5 having perforations in the bottom Electrode blocks b are located at the bottom of the flotation cell 3 and are connected to the power supply sources 7. In the flotation cell, there is a penosborn partition 8 made of successively connected trays in the form of truncated cones. In the outflow chamber 4, there is a level 9 controller.

The electrode unit (Figs. 2 and 3J) consists of a metal rod 10 on which a graphite cylinder 11, which is an anode, is mounted. The cathode 12 is made of wire tensioned between the metal washer 13 and the dielectric washer 14. The wire cathode (strings 12 are located coaxially the anode 11.

Electrofloat apparatus operates as follows.

Through the inlet nozzle, the water to be purified is fed into the flow entry chamber 2, where the jet velocity is quenched. From chamber 2, water through perforations in the partition 5 is supplied to the flotation chamber 3, washing the electrode blocks. B. As water moves in the flotation chamber, the contaminating particles are trapped by gas bubbles, formed on the electrodes, and carried to the surface. The horizontal partition 8 is multifunctional. The partition trays create stagnant zones in which aggregates consisting of gas bubbles and contaminants adhere to them float unhindered. The trays reduce the size of the free surface while increasing the thickness of the foam layer, which makes it easier The partition plays the role of a foam collector working reliably due to the absence of moving parts.

The deposition of hardness salts on the cathode is significantly reduced, due to cathode oscillations when current is passed at a frequency of 25–50 Hz. The choice of this frequency is due to the fact that the amplitude of oscillations of a cathode made in the form of a tensioned wire is the greater, the lower the frequency of current pulsations (less than 50 Hz). However, the pulsation frequency of 25 Hz and 50 Hz is easily obtained by using a full-wave rectifier of the alternating current of the industrial frequency, and obtaining an intermediate or lower frequency requires the creation of special power sources. In addition, the frequency of oscillation of the cathode, equal to the frequency of the current pulsation, below 20 Hz has a harmful physiological effect on humans, therefore, the frequency of the pulsations is recommended to be equal to 25 50 Hz.

Example. Sewage water containing petroleum products is subjected to purification in the apparatus of the prototype and in the proposed apparatus. Pp ultyat presented in the table.

Claims (1)

ELECTROFLOTATION APPARATUS for the treatment of industrial wastewater from oil products, containing an input chamber, a flotation chamber with discretely arranged electrode blocks, a foam collecting device and an output chamber, characterized in that, in order to increase the degree of purification and reduce energy consumption by reducing the deposition of hardness salts, the anode the electrode block is made in the form of a graphite cylinder, around which cathodes are made in pairs coaxially, made of wire, installed with tension and connected to the source chniku pulsating current pulsations with a frequency of 25-50 Hz. FIG. / 1929601