SU1208022A1 - Waste water purification plant - Google Patents

Description

The invention relates to the treatment of wastewater from pollution before releasing them into rivers and open water bodies and can be used in settlements, industrial enterprises and on means of transport, in particular on ships.

A known wastewater treatment plant comprising three blocks; cleaning unit, fine cleaning unit and disinfection unit. In the cleaning unit, solid inclusions are separated. This unit includes a receiving tank, a chemical treatment and oxidation unit, an ejector called circulation, pressure and flotation tanks. In the fine block, water is filtered, with the result that contaminants are reduced to a concentration of suspended solids in water of 70 mg / l. An intermediate tank and a fine filter are included in the fine cleaning unit. In the disinfection unit, bacteria of the Escherichia coli group are eliminated in the water to a 1000-volt Kolya titer and the disinfection unit includes a contact column and an ozone generator l.

However, a well-known installation does not sufficiently clean the wastewater and is rather cumbersome.

The aim of the invention is to increase the degree of wastewater treatment, ensure compactness and reduce the size of the installation.

This goal is achieved by the fact that in a sewage treatment plant containing a purification unit, a fine purification unit with a filter including sand loading, a disinfection unit with a contact column, ejectors, a pump, source water supply and treated pipelines, an ozone generator, a purification unit made in the form of a reserve, separation divided by partitions into clarified water separation, sludge separation, pressure flotation chamber with electrocoagul toro built at the bottom and pressure-free flotation chamber communicated with pressure chamber flotation, while the lower part of the free-flow flotation chamber communicates with the upper part of the separation of clarified water and with the upper part of the filter of the fine cleaning unit having a float valve, the upper part of the separation unit

the imperishable water is equipped with a float valve and is connected via an ejector to the upper part of the filter of the fine cleaning unit and to the pipeline of the initial waste water, which is also connected to the sludge compartment having a float valve; the lower part of the clarified water compartment communicates with the upper part of the filter at the level of the sand load through the pump and the ejector, which is connected to the upper part of the contact column, the lower part of the filter is connected to the lower part of the column through the ejector, which is connected to the ozone generator.

In the upper part of the filter of the fine cleaning unit during pressure flotation, waste water is oxidized with residual ozone-air mixture, which was not used for disinfection in the contact column of the disinfection unit. For this, the upper part of the contact column is connected by a pipeline with an ejector installed on the water supply line from the cleaning unit to the filter. In addition, the degree of purification is increased due to the fact that the waste water treated with an ozone-air mixture in the upper part of the filter is passed through a free-flow flotation chamber, in which the cleaning continues.

, The cleaning process is intensive, as the incoming waste water is filled with ozone-air bubbles mixed with water in the upper part of the filter.

The compactness of the dimensions is achieved by the fact that the electrocoagulant is placed inside the pressure chamber, the flotation chamber, and also due to the exclusion of the pressure tank and intermediate tank from the installation.

The drawing shows a sewage treatment plant.

The installation includes a cleaning unit D, a unit B for fine cleaning and a disinfection unit 6;

The cleaning unit A comprises a housing 1 in which, on the one hand, a pressure flotation chamber 2 is located, in the middle a pressure flotation chamber 3, on the other hand, a slurry compartment 4 and a clarified water compartment 5 in the upper part. In the chamber of pressure flotation, an electrocoagulant 6 is placed below.

3

Block b fine cleaning consists of a filter 7 and an ejector 8. In the upper part of the filter 7 there is a float valve 9.

The disinfection unit B consists of an ozone generator 10, a contact column 11 and an ejector 12;

The installation is equipped with a pump 13 installed on the pipe 14 between the lower part of the clarified water chamber 5 and the ejector 8. The lower part of the pressure flotation chamber 2 of the cleaning unit A is connected to the ejector

15 pipeline seawater suction 16.

In order to replenish the compartment 5 of the illuminated water, a float valve 17 is installed in the upper part, which regulates the flow of water from the pump 13 to the pipe 18,

In the upper part of the sludge compartment 4, a float valve 19 is placed which, when overflowed, water flows through the pipe 20 to the rotary treatment.

The lower part of the chamber 3 of free-flow flotation is connected by pipe 21 to the upper part of the compartment 5 for clarified water and pipe 22 to the float valve 9 on the upper part of the filter 7. The ejector 15 is connected by pipe 23 to the upper part of the water cavity of the filter 7 ..

The ejector 12 is connected by pipe 24. The ejector 8 is connected by pipe 25 to the top of the contact column 11. The ozone generator 10 is connected by pipe 26 to the ejector 12. Purified purified water is removed from the installation through pipe 27.

The proposed installation works as follows.

Pipeline Untired

16 is sucked by the ejector 15 and injected into the pressure flotation chamber 2 located in the housing 1 of the cleaning unit A through electrocoagulator 6. As the working water into the ejector

15 water is supplied through conduit 23 from the top of the filter. 7,

When entering the chamber 2, the water pressure drops to atmospheric, therefore, the ozone-air mixture dissolved in water is released in the form of bubbles, lifting the plates between the plate electrodes of the electrocoagulator 6 upwards. In the electrocoagulator anodic dissolution of the metal occurs with

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the formation of metal hydroxide, which, upon contact with particles of the suspension, causes its enlargement (coagulation). This suspension of gas bubbles

5 is also entrained in the upper part of chamber 2 and drained into sludge compartment 4 in the form of foam, and water is lowered in chamber 3 of unconfined flotation towards the rising ozone and air, which are supplied through pipe 22 from filter 7 through float valve 9. From chamber 3 water through line 21 is transferred to clarified water section 5, from where

(5 by pump 13 is sucked through conduit 14 and is injected into filter 7 through ejector 8. At the same time, the ejector draws the ozone-air mixture through conduit 25 from column 11 and mixes it with water. In the filter, the ozone-air mixture under pressure partially dissolves into water, and 4actH4HO in the form of large bubbles rises entrained for a suspension, which

25 continues to be enlarged, as a consequence of the breakdown of its aggregative stability under the influence of ozone.

The water in the filter is divided into two streams: a large flow equal to the capacity of the plant, and a smaller flow constituting about 30% of the total water flow through the filter. A large flow of water is filtered and sent through conduit 24 to ejector 12, in which it mixes with the ozone-air mixture, which enters through pipe 26 from the ozone generator 10, and then enters the contact column 11 of the disinfection unit. A smaller flow of water with ozone-air mixture oxidized and bubbling as a result of sparging through pipeline 23 is directed to ejector 15, where it is used in

 the quality of the working water for the suction of the original waste water through the pipeline 16. The productivity of a smaller flow (30% of the total consumption, of water. is due to the suction

50 with the capacity of an ejector 15, which for technical reasons cannot suck more than two volumes of water per volume of production water.

Maintain a constant level

55 water in compartment 5 of clarified water is provided with a float valve 17, which, when the level falls, opens and transfers water.

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from pump 13 through pipe 18 to restore the required level, which made it possible to exclude an intermediate tank from the prototype installation.

When a significant amount of water accumulates in chamber 4 of the sludge (due to compaction of the sludge), the float valve 19 opens and transfers water through the pipe 20 to the rotary treatment. The clarified water coming in from the filter 24 is treated with an ozone-air mixture, first in the ejector 12, and behind in the contact column 11, as a result of which the final purification stage is performed — water is not decontaminated. Thus, the waste water that has been purified by chemical treatment, pressure flotation, additional cleaning in the free-flow flotation chamber, additional treatment with an ozone-air mixture in the filter, filtration and disinfection is removed from the unit by

pipe 27,

It can be seen from the above description that the process of water purification processes, which is more intensive than the prototype, is caused by the following factors.

Pressure flotation of water with an ozone-air mixture as it passes through an electrocoagulator accelerates the coagulation process due to the oxidizing effect of ozone and ensures the protection of the plate electrodes from contamination, which is facilitated by the flow of water flowing through the plates in a laminar mode. Maintenance of the electrocoagulant simplified.

Ozonation of water in the filter under pressure with the removal of the most polluted part of the water — re-treatment in addition to the filtering load improves the purification of water in the filter, increases filtration and eliminates the accumulation and development of microflora directly in the filter.

Ozonization of water in the first two stages of treatment significantly disinfects water, which contributes to a more efficient final disinfection.

Provides the most complete

the use of ozone moving

backflow principle: ozone-air with maximum concentration of O3orfa is supplied to the final

water disinfection with neutralization of difficultly oxidizable contaminants. The remaining ozone is used in the filter, and then for pressure and free-flow flotation with simultaneous effects on easily oxidizable contaminants.

The degree of wastewater treatment is enhanced by the introduction of pressure flotation with an ozone-air mixture into

filter 7 and bubbling in chamber 3 of free-flow flotation; Bubbling with an ozone-air mixture in chamber 3 of free-flow flotation provides not only the oxidation of organic substances in

water, but also serves as a curtain against the penetration of suspended solids with the flow of water into the clarified water chamber 5.

Thus, the invention allows to increase the degree of wastewater treatment, simplify the design and reduce the size of the installation.

Editor M, Pandora

Compiled by L. Sukhanova

Tehred A. Kikemezey Proofreader T. Kolb

Order 169/31 Circulation 863 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch GShP Patent, Uzhgorod, st. Design, 5

Claims (1)

SEWAGE TREATMENT PLANT, comprising a purification unit, a fine-purification unit with a filter including sand loading, a disinfection unit with a contact column, ejectors, a pump, feed water supply and outlet pipelines treated, an ozone generator, a heater and a chaga with the fact that, in order to increase the degree of wastewater treatment, to ensure compactness and to reduce the size of the installation, the treatment unit is made in the form of a tank divided by partitions into a clarified water compartment, a sludge compartment, a pressure flotation chamber with built-in an electric coagulator near the bottom AND a pressure-free flotation chamber in communication with a pressure flotation chamber, while the lower part of the pressure-free flotation chamber is in communication with the upper part of the clarified water compartment and with the upper part of the fine filter block having a float valve, the upper part of the clarified water compartment is equipped with a float valve and connected to the pump, the lower part of the pressure flotation chamber is connected through the ejector to the upper part of the filter of the fine block with the pipeline of the initial waste water, which also connected to a sludge compartment having a float valve; the lower part of the clarified water compartment is connected to the upper part of the filter at the sand loading level through a pump and an ejector ', which is connected to the upper part of the contact column, the lower part of the filter is connected to the lower part of the column through an ejector, which is connected to the ozone generator.