SU983073A1 - Apparatus for electrochemical purifying of waste water - Google Patents

Description

(54)

APPARATUS FOR ELECTGOCHEMICAL CLEANING OF WASTEWATER

The invention relates to devices for the electrochemical treatment of wastewater and can be used in the electrochemical industry.

A known apparatus for electro-chemical wastewater treatment, comprising a housing with vertically arranged lamellar soluble anodes made of iron ,, aluminum or aluminum alloys. At the bottom of the case there is a horizontal cathode C. i

However, in the known apparatus, the electroflotation process lags significantly behind the coagulation process in time, i.e. when reaching a clean cleaning, when all contaminants rise to the surface, a coagulum that is present in the water as a suspension accumulates in the electrolyzer. Thus, the material of the anodes is spent inefficiently, which leads to a rapid activation of the electrodes. On the other hand, if the electrolysis is carried out for a time sufficient only to complete the coagulation process, then a significant part of the coagulant will remain in the fluid volume, not having time to float to the surface, and this fluid needs to be further cleaned.

Closest to the proposed technical essence and the achieved effect is an apparatus for electrochemical treatment of wastewater, comprising a housing with soluble and insoluble plate electrodes, a device for removing flotation products, wastewater nozzles and discharge of the purified liquid, equipped with valves (2.

However, in a known apparatus it is impossible to establish a strictly fixed duration of electrocoagulation with soluble electrodes, since it is impossible to determine whether there is enough coagulant in the water at a given time to coagulate soils. Similar difficulties may arise when transferring the apparatus to another mode of operation - an increase or decrease in current density, flow rate of the fluid, etc. Therefore, all this can lead to the fact that in each specific case either 3983 water will be treated with an insufficient amount of coagulant, or there will be a supersaturation of water with coagulum, and hence the overrun of the latter, which indicates an insufficient efficiency of the apparatus. The purpose of the invention is to increase the efficiency of the apparatus. This goal is achieved by the fact that the device is equipped with a circulation pipe with a pump sequentially mounted on it, an adjustable valve, a cartridge filter and a unit for measuring the optical density of water, while the cartridge filter is provided with a circulating pipe. The drawing shows a schematic diagram of the apparatus. The apparatus includes a housing 1, a pump 2, a cartridge filter 3 with a load of elastic material, such as polyurethane foam, a unit 4 for measuring the optical density, a power supply unit (not anointed). In the housing 1 of the apparatus are arranged, alternately, lamellar: electrodes 5 of aluminum and electrodes 6 of stainless steel or graphite. A nozzle 7 with a valve 8 serves to supply a well-defined liquid, and a nozzle 9 with a valve 10 - days of discharge of purified water. Device U for removing products Flotagras is made with the possibility of movement along the body 1 of the apparatus and the foam receiver 12. To the cabin 9 is attached; a circulation pipe 13 with a valve 14 connecting the pump 2 in series, a cartridge filter 3, and a block 4. The end of the pipe 13 is connected to the pipe 7 in front of the valve 8. The pipe 13 has a branch in the pipeline 15 to the valve 16 connected to the main line the pipeline upstream of block 4. During the cleaning cycle, a volume of liquid, 1 / 200-1 / 50 of the volume of the liquid to be purified, is pumped through pipelines 13 and 15. Unit 4 is connected to an electrode reversal control relay located in the power supply unit. The foam from the foam 12 is removed through the pipe 17. The apparatus operates as follows. Sewage water is supplied to the apparatus through nozzle 7. At the same time, the valve 10 and the spring 16 are closed, and the valves 8 and 14 are open. After the liquid reaches the foam-receiving level 12, the wastewater supply is stopped, the valve 8 is closed, and the electrodes are supplied and supplied in this way, aluminum electrodes 5 work as anodes, and stainless steel or graphite electrodes 6 as cathodes. At the same time, the pump 2 and the block 4 are turned on. After the optical density reaches a predetermined value, from block 4 a signal will be sent to the electrode power control relay providing the polarity reversal of electrodes 5 and 6. At the same time, valve 14 is closed and valve 16. Dissolution of anodes and coagula flow This sewage water is stopped as the aluminum electrodes 5 begin to work as cathodes. At the moment of switching the polarity of the electrodes 5 and 6, most of the contaminants (50-60%) contaminated with hydrogen gas are already on the surface of the liquid. Reversing the electrodes will provide enhanced flotation contaminated on the surface of the liquid. Such an increase in flotation in comparison with flotation before reversal is due to the release of gaseous oxygen on the stainless steel electrodes 6 or graphite. The termination of the electro flotation process is recorded by block 4 by changing the optical density to the required value. In this case, unfiltered liquid is pumped through block 4 bypassing filter 3 and complete suspension is fixed by block 4, which will give a signal to turn off the electrical power supply to the device. The flotation products are discharged by means of the device 11 into the foam receiver 12, and then through the nozzle 17 - b dump. The pump 2 and the unit 4 for recording the optical density are turned off, after which the valve 10 is opened at the nozzle 9 and all the purified liquid is drained from the apparatus. Then the valves 10 and 16 are closed, the valves 8 and 14 are opened, the device is refilled with contaminated waste water and the cleaning cycle is repeated. The present invention allows to significantly increase the efficiency of the apparatus by setting the optimal duration of water treatment in the electro-coagulant mode and electroflotation. This, in turn, creates savings in electricity and metal electrodes and provides high-quality wastewater treatment. The formula of the acquisition and the apparatus for electrochemical treatment of wastewater, including, a housing with soluble and insoluble plate electrodes, a device for removing flotation products, nozzles for supplying waste water and discharge of the purified liquid, equipped with valves, characterized in that, in order to improve the efficiency of the device It is equipped with a single pipe with a pump installed on it, an adjustable valve, a cartridge filter and a unit for measuring the optical density of water, with ohm

59830736

the cartridge filter is provided with a bypass pipe-1. Patent Vetozobrntany N 1372465,

wire C 02 C 5/12, 1974.

Sources of information, -2. Processing materials,

P1nshtye in attention at examination 1978, N 6, p. 8 (X-88.

Claims (1)

Apparatus for electrochemical wastewater treatment, including, a housing with soluble and insoluble plate electrodes, a device for removing flotation products, sewage water supply pipes and purified liquid drains equipped with valves, characterized in that, in order to increase work efficiency apparatus, it is equipped with a circulation pipe with a pump sequentially installed on it, an adjustable valve, a cartridge filter and a unit for measuring the optical density of water, while 5 983073 6 cartridge filter equipped with a bypass pipe.