SU1638122A1 - Water clarifying tank, column type - Google Patents

Abstract

The invention relates to devices for the biological treatment of wastewater and is intended for use in sewage treatment plants in a wide range of capacities. The goal is to increase efficiency and reliability by increasing mass transfer and reducing operating costs. The essence of the invention is that in an aerotank of column type, comprising a rectangular or circular case of form, divided by vertical and inclined partitions into aeration and clarification chambers, source supply and discharge units of purified liquid and excess sludge and an activated sludge circulation system, The aeration chamber is equipped with a jet aeration system, which communicates with it in the upper and lower parts through an ejector, a pump, suction and pressure pipelines, and tubular recirculation boxes, so that The aerator is located above the tubular recycle boxes, the lower end of which is buried beneath the liquid level. 2 il, SS (L

Description

The invention relates to equipment for the biological treatment of wastewater.

The purpose of the invention is to increase the efficiency and reliability of operation due to the intensification of mass transfer and reduction of operating costs.

Figure 1 shows the aero-brightener, longitudinal section; figure 2 - aeration tank clarifier, top view.

Aerotank-clarifier column type includes a housing 1, vertical

and inclined partitions 2 and 3, which divide the aeration tank into chambers 4-7, respectively, of aeration, recirculation, degassing and clarification. In the upper part of the partitions 2 are overflow windows 8, equipped with gates 9.

Partitions 3 are installed at an angle in the clarification chamber, one end of which is fixed on vertical partitions 2, and the other does not reach the walls of building 1, These partitions are sized.

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divide the height of the camera on the height of the individual Rus, communicating through the slit gaps 10.

Under partitions 3 in each russ there is a pipeline 11 for draining purified water into a collecting bowl 12. Recirculation slots 13 are located in the lower part of the aerotank-clarifier of the column type 13. The aeration chamber 4 is equipped with a jet aeration system communicating with it in the upper and lower parts through the ejector 14 , pump 15, suction and pressure pipelines 16 and 17 in such a way that the aerator ejector is located above the barrel 18 with a tubular recirculation duct 19.

The lower end of the barrel 18 is buried beneath the level of the liquid. In the aeration chamber in the upper part there is also a unit 20 supplying the cleaned fluid. In the lower part of the clarification chamber a node 21 for removing excess activated sludge is placed.

Aerotank-clarifier column type works as follows.

Through node 20, the crude waste liquid enters the aeration chamber 4, where it is mixed with activated sludge under aeration conditions by air drawn in by ejectors 14 and fed via barrel 18 to the depth of recirculation tubing 19.

Rapid mixing of waste liquid with activated sludge and saturation of air with oxygen occurs as a result of intensive recirculation of fluid through the tubular duct 19. The oxygen-rich illo-air mixture through the overflow ports 8 enters the degassing chamber, where the air bubbles are separated. From the degassing chamber of the sludge mixture in the form of a recirculation flow, it enters the recirculation chamber 5, moves down from top to bottom, each pass through the gaps 10, and then through the recirculation gaps 13 returns to the aeration chamber 4. Thus, due to the density difference between the water-air mixture in the aeration chamber and the liquid in the clarification chamber between these chambers,

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In addition to the exchange between the aeration and clarification chambers, the oxygen-free, non-saturated dissolved oxygen recycle stream in the expanding spaces between the surfaces of the inclined partitions forms suspended (fluidized) layers of active sludge in each channel. in the entire volume of the device occupied by the sludge, and the clarification of the treated wastewater occurs simultaneously when it is filtered through suspended layers of the active type. The productive stage of sludge separation from purified water is sedimentation. Purified water is evenly collected above the suspended layers by collecting pipe 11 and discharged into a collecting bowl 12 and further removed from the structure. The collecting bowl device 12 ensures an even selection of purified water from each tusk. Excessive sludge is removed by node 21.

The use of the invention allows to reduce by 2-2.5 times the amount of air supplied to the aeration and by 5-6 times to reduce energy consumption, to increase the reliability and efficiency of its work.

Claims (1)

Invention Formula The aerotank clarifier is of a column type, comprising a housing divided by vertical and inclined partitions into aeration and clarification chambers, an aeration and circulation system of activated sludge, source supply and discharge of purified water and excess sludge, characterized in that reliability due to the intensification of the mass transfer process and reduction of operating costs, it is equipped with a tubular recirculation box installed along the body axis between the vertical partitions, and the aera system This structure is made of an ejector located above the duct and a pump, suction and pressure pipelines connected to it. C-bl I fNS go 21 FIG. 2