SU1305132A1 - Arrangement for biochemical treatment of waste water - Google Patents

Abstract

This invention relates to biochemical wastewater treatment. The purpose of the invention is to increase the efficiency of wastewater treatment and reduce the volume of the facility. In the device, the flotation sludge separation chamber (CFI) 4 is expanding downwards, equipped with aerators in the lower part with a decreasing area to the periphery, and the circulating active sludge return unit (AI) is located above the water level in the ICA aeration chamber 2. Processed in KA 2 the waste fluid along with the activated sludge enters the flotation sludge separation chamber 4. Due to the tapering shape of the CFR, the velocity of the liquid in the lower part is sharply reduced, which creates favorable conditions for the trapping of AI particles by air bubbles Supplied through aerators 9. Part sflotirovannogo AI returned to the spacecraft, and the other part is supplied into the processing chamber izbytochno- and p th AI 5. Here, due to applying vozdu- ha through the aerator 17 and the presence of the inclined partition walls 18 originate intensive mixing and stabilization of the AI. 1 il. , (L

Description

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This invention relates to the treatment of domestic and industrial waste water.

The aim of the invention is to increase the efficiency of wastewater treatment and reduce the volume of the structure due to the intensification of the processes of clarification and biochemical oxidation.

The drawing shows a device for biochemical wastewater treatment cross section.

The device comprises a housing 1, aeration chambers 2 with rotary loading 3, flotation sludge separation 4 and an excess activated sludge treatment chamber 5. The aeration chamber 2 is equipped with an inlet 6 for the treated wastewater and a semi-submerged partition 7, which together with the wall of the aeration chamber 2 forms a submerged overflow 8. The chamber 4 of flotation sludge is expanded at the bottom and equipped with aerators 9 in the lower part, the area of which decreases from center to periphery chambers, and nodes 10 release of purified water, and in the upper part of the node 11 return circulating sludge formed by a half-submerged partition 7 and the wall 12 of the chamber 5 of the treatment of excess sludge, equipped with The partition wall 13 and the inclined guide peaks 14, the chamber 5 for treatment of excess sludge is equipped with a receiving window 15, guide walls 16, located equidistantly; 12. In the lower part, chamber 5 is equipped with aerators 17, in the central part — flooded, not reaching the bottom of chamber 5, inclined partitions 18 that are symmetrical about its axis, and in the upper part — a collecting tray 19, whose axis coincides with the axis cameras 5.

The device works as follows.

Sewage water through the inlet unit 6 enters the aeration chamber 2, where, in contact with the biological film located on the surface of the rotating load 3, sorption and biochemical oxidation occur with activated sludge and air oxygen.

Sorbiru on its surface contaminated with water, the bio-aggregate increases its volume and weight, which contributes to its rejection from the rotating load in the aeration chamber 2, where it continues to be dried as active sludge.

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Bat on yourself. Processing Tanna water along with activated sludge through the flooded overflow 8 enters the chamber 4 of flotation sludge. Aerators 9 are located in the lower part of the flotation sludge separation chamber, which disperse the compressed air into small bubbles, which, when passing through the sludge mixture, adhere to the flakes of active sludge and form flotation complexes that float to the surface of the water. Due to the fact that the chamber 4 is made expanding downwards, the speed of movement of water in the lower part of the chamber 5 is sharply reduced. Thus, favorable conditions are created for the formation of flotation complexes, thereby increasing the efficiency of clarification of the treated water. In addition, due to the narrowing of the chamber 4 of flotation sludge separation, the concentration of the gas phase along the height of the chamber increases from bottom to top, reaching its maximum near the CB surface, which corresponds to an increase in the concentration of active sludge along the height of the chamber. Due to this, the flotation process proceeds most effectively.

An increase in the concentration of floccomg, plexes in the upper part of chamber 4 due to its narrowing leads to the formation of a filtering layer, which delays a part of the sludge entering the chamber along with the treated water. This makes it possible to reduce air consumption for flotation sludge separation, as well as to reduce the volume of the sludge separator.

The use of aerators with a decreasing area to the periphery prevents the formation of vortex flows near the walls of the flotation cell separation chamber, since this ensures that the aeration intensity in any horizontal section of the chamber 4 is the same in area.

The clarified water is discharged through node 10 for further processing,

The sealed activated sludge enters the node 11 of the return of circulating sludge, in which it accumulates and partial 6 leaks, Since the node 11 of the return and recirculating sludge is located above the level of liquid in the aeration chamber, the circulating sludge enters the aeration chamber without additional energy consumption through the gap, formed by inclined directions3130

visors 14, and its consumption is determined by changing the position of the adjustable partition 13

The remaining part of the compacted sludge through the receiving window 15 enters the chamber 5, where when in contact with oxygen of the air supplied through the aerator 17, aerobic stabilization of excess sludge occurs.

Since the aerator 17 is located between the inclined partitions 18, when the air is supplied, a reduced pressure zone is created above the aerator and r j. An increased pressure zone underneath, thereby creating a circulation flow in the chamber 5. At the same time, the directions of the circulation flow are set sloping walls 18 and curved walls of the collecting tray 19, which simultaneously serves to discharge treated-excess sludge. Since the sludge treatment chamber is made tapering downwards, the possibility of stagnant zones in the bottom part of the chamber is eliminated, which creates the most favorable conditions for the sludge stabilization process.

The use of the proposed bioflotcompact allows to increase the efficiency of wastewater treatment, to reduce the volume of flotation sludge

Editor N. Gunko

Compiled by L. Sukhanova

Tehred A. Kravchuk, Proof-reader I. Erdeyi

Order 1380/19 Circulation 852Subscription

 VNIIPI USSR State Committee

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

Production and printing company, Uzhgorod, st. Project, 4

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divider, reduce air and power consumption for flotation silt

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Claims (1)

Invention Formula A device for biochemical wastewater treatment, comprising a casing, aeration chambers and flotation sludge compartments with aerators, for the treatment of excess activated sludge, source wastewater inlet units, the release of purified water and the return of circulating activated sludge, characterized in that To improve the efficiency of wastewater treatment and reduce the volume of facilities due to the intensification of the processes of clarification and biochemical oxidation, the flotation sludge separation chamber is made extended downwards, equipped with they are partitioned symmetrically relative to the walls of the aeration chamber and exiting above the water level, and the aerators in it are made with an area decreasing from the center to the periphery of the chamber, and the return unit is located above the water level in the aeration chamber, and the surplus sludge treatment chamber is provided with flooded symmetrical about the axis of the walls and the collecting tray.