SU1481210A1 - Clarifier air tank of column type - Google Patents

Abstract

The invention relates to wastewater treatment and is intended to increase the efficiency of devices. The purpose of the invention is to increase the efficiency of the device by stabilizing mass transfer in the aeration zone. The aero-illuminator contains vertical 2 and transverse inclined partitions 3, dividing it into zones of aeration 4, recirculation 5, degassing 6 and lighting 7. Under the partitions there are pipelines 11 for draining clarified water. During operation of the device, the cleaned liquid is supplied from above through node 16, and air through pneumatic aerators 15. Excessive sludge is discharged through pipeline 17. Aeration zone 4 is equipped with a system of tubular recirculation boxes 14 communicating with it in the upper and lower parts. The use of the invention allows to significantly reduce the amount of air supplied and energy consumption. 2 Il.

Description

baffles 3 dividing it into zones of aeration 4, recirculation 5, degassing 6 and clarification 7. Pipelines 11 are located under the partitions for draining clarified water. During operation of the device, the liquid is cleaned from above through node 16, and air through pneumatic aerators 15. Excess sludge is discharged through the pipeline

17. The aeration zone 4 is equipped with a system of tubular recirculation boxes 14 over its entire height, communicating with it in the upper and lower parts. The use of the invention allows to significantly reduce the amount of air supplied and energy consumption. 2 Il.

one

The invention relates to devices for biological wastewater treatment, namely to aeration tanks used in sewage treatment plants of cities and industrial enterprises.

The purpose of the invention is to increase the efficiency of the device by stabilizing the mass transfer in the aeration chamber.

Figure 1 shows the aeration tank-clarifier of the column type, type of sheet xyj in FIG. 2 is a sectional view of FIG.

The aeroengine-clarifier of the column type contains body 1, vertical 2 and transverse inclined 3 partitions, dividing it into chambers 4-7, respectively, aeration, recirculation, degassing, clarification. In the upper part of the partitions 2, overflow windows 8 are made, equipped with shiber 9.

one

In the clarification chamber, transverse partitions 3 are installed at an angle to the body, one end of which is fixed on the vertical partitions, and the other does not reach the body 1. The partitions 3 divide the chamber in elevation into separate compartments and communicate through the gap gaps 10. Under The pipelines 11 are located by partitions 3 in each tusk to drain the clarified liquid into the collection bowl 12.

Recirculation slots 13 are located in the lower part of the aerotank-clarifier of the column type.

The aeration chamber 4 along its entire height is equipped with a system of tubular recirculation boxes 14 communicating with it at the top and bottom. In the upper part in the volume of the aeration chamber 4 and inside the tubular part of the recirculation boxes at a depth that enables the use of low-pressure blower equipment, pneumatic aerators 15 are placed. In the aeration chamber 4 in the upper part also the source liquid supply unit 16 is located. A pipeline 17 is placed in the lower part of the device to remove excess sludge.

Aero-clarifier works as follows.

Pipeline 17 discharges wastewater into aeration chamber 4, where it mixes with activated sludge under aeration conditions by air supplied through aerators 15 and intensive recirculation through tubular ducts 14, resulting from the difference in density of the medium in tubular ducts in the volume of the aeration zone, caused by the fact that in the aeration process, most of the air is supplied through aerators 15 located in the volume of the aeration zone, and only a small part of it is supplied through aerators placed in tubular ducts. The energy moving from top to bottom through the tubular recirculation boxes of the flow of the iodine mixture is so high that the emerging air bubbles in the volume of the aeration zone and the air fed into the tubular boxes are entrained by it, transported to the bottom of the aeration zone and returned to the aeration zone. Thus, the process of dissolving 1 of the oxygen in the air occurs under countercurrent conditions, providing more

a high percentage of use of air oxygen than in the known device, and in the volume of the zone, mass exchange is stabilized. The oxygen-saturated oxygen mixture flows through the overflow windows 8 into the degassing chamber 6, where air bubbles are separated, and then flows downward along the walls of the housing 1, passing each row through the gaps 10, and then returning to the chamber through the recirculation slots 13. 4 aeration. Between the aeration chambers 4 and the clarification 7, a repeated recycling is established, as a result of which, with the passage of the volume of each Russ, vortex flows arise and a suspended (fluidized) layer of activated sludge is formed.

The oxidation of contaminants in the treated wastewater flows throughout the entire volume of the device occupied by the sludge, and the clarification of the treated wastewater occurs when it is filtered through suspended layers of sludge. Purified water is collected by pipes 11 and discharged into a collection bowl 1 2 and further removed from the structure. The device of the collecting bowl provides uniform selection of the purified, waste water from each Russ. Excess sludge is removed through conduit 17.

Equipping the aeration zone with a tubular recirculation box system allows organizing directional recirculation within its volume and stabilizing mass transfer when air is supplied at a shallow depth, thus eliminating the need to use scarce and energy-intensive blower equipment. In addition, the arrangement of tubular recycle boxes increases the gas saturation of the medium and leads to the creation of directional recirculation not only in the volume of the aere zone.

Q 5 0

50

d 5

five

but also between the aeration and clarifier zones, which is a prerequisite for the formation of suspended layers of activated sludge along the height of the aerotank in each river and the intensive process of removal and oxidation of wastewater in them. The creation of a directional circulation in the volume of the aeration zone ensures the involvement of air bubbles to the full depth of the aerotank, which leads to the dispersion of the supplied air under countercurrent conditions, an increase in the total residence time of air in the liquid, an increase in pressure and a significant intensification of oxygen dissolution and biochemical oxidation and an increase in the use of oxygen in the air and, ultimately, the overall performance of the device.

The use of an aeration tank-clarifier of the column type allows to reduce by 2-2.5 times the amount of air supplied to the aeration and 5-6 times the power consumption.

Claims (1)

Invention Formula The aeroengine-clarifier of the column type, comprising a housing with vertical and inclined transverse partitions, pneumatic aerators in the aeration chamber, an initial fluid supply unit and pipelines for drainage of the clarified liquid and excess sludge, characterized in that, in order to increase work efficiency by stabilizing mass exchange in the aeration chamber It is equipped with a system of tubular recirculation co-1 bobs placed along the entire height of the aeration chamber and communicating with it in the upper and lower parts, and the aerators are arranged as in the volume aeration chamber, and inside the tubular ko-. i i Ixtf / U 1Z fie. i