RU2283682C2 - Sedimentation tank with descending/ascending flow of liquid - Google Patents

Abstract

FIELD: engineering of sedimentation tanks for cleaning sewage, possible usage for cleaning sewage from precipitating and floating suspended substances.

SUBSTANCE: sedimentation tank contains cylindrical body, conical wall in cylindrical section of body, distributing branch pipes, connected to gutter for feeding sewage and positioned inside the conical wall. Bowl for removal of floating substances is made with toothed spillway weir.

EFFECT: intensification of cleaning of sewage from precipitating and floating substances due to improved hydrodynamic characteristics.

2 dwg

Description

The invention relates to designs of sumps for wastewater treatment and can be used for wastewater treatment from settling and floating suspended solids.

Known sump with a downward-upward flow of fluid designed by A.V. Ershov, containing a cylindrical body and a conical body, a baffle in the cylindrical part of the body, the feed source of sewage, a gear spillway, a bowl for removing floating substances, a sediment removal pipe under hydrostatic pressure, prefabricated clarified wastewater tray with a clarified wastewater removal pipeline (SU 208552 A, class B 01 D 21/02, 03/12/1968).

A disadvantage of the known installation is the constant downward-ascending velocity of the wastewater in the live section of the sump, as a result of which the gravitational coagulation of floating and settling suspended solids due to the absence of a suspended layer occurs slowly.

The technical problem, the solution of which the alleged invention is directed, is the intensification of wastewater treatment from settling and floating suspended solids.

This problem is solved by the fact that in order to intensify the process of treating wastewater from settling and floating suspended solids with the help of a conical baffle, a variable speed of the downward-upward flow of wastewater is created in the cylindrical tank of the sump.

The invention is illustrated by drawings, where figure 1 shows a General view of the sump with a downward-upward flow of liquid, figure 2 is a section aa in figure 1.

The positions in the drawing indicate:

1. Feed wastewater feed tray

2. Distribution nozzles

3. Bowl with a gear spillway to remove floating substances

4. Conical partition

5. Cylindrical settling tank

6. Conical sedimentation tank

7. Sludge removal pipe under hydrostatic pressure

8. Collection tray

9. Pipeline for the removal of floating substances

10. The clarified sewage disposal pipeline

The sludge tank with a downward-upward flow of liquid consists of a feed wastewater supply tray 1, distribution nozzles 2, a bowl with a gear spillway for removing floating substances 3, a conical partition 4, a cylindrical body 5, a conical body 6, a sediment removal pipe under hydrostatic pressure 7, prefabricated tray 8, the pipeline for the removal of floating substances 9, the pipeline for the removal of clarified wastewater 10.

An example of the operation of a sump with a downward-upward flow of liquid.

Contaminated wastewater through the feed wastewater feed tray 1 through the distribution nozzles 2 is fed into the inner space of the conical septum 4. The conical septum 4 has a different live section area in height, and the area in the upper part of the conical partition 4 is smaller than in the lower one, and therefore , the speed of wastewater in the upper part of the conical septum 4 will be greater than in the lower part (variable speed of the wastewater). Particles of floating substances in suspension in wastewater, due to different hydraulic fineness and variable speed of movement of wastewater in the conical septum 4, have a different floating rate, as a result of which they collide and enlarge, and floating are concentrated in the upper part of the conical septum 4 particles with a larger hydraulic size, in the lower - with a smaller one, that is, a suspended layer is formed (when the vertical speed of movement of wastewater in a horizontal section conical septum 4 will be equal to the hydraulic particle size). Due to the inflow of contaminated wastewater into the conical septum 4 through the distribution pipes 2 in the upper part of the conical septum 4, an excess top layer of surfaced contaminants is formed, which is transported by gravity outside the cylindrical sump through a gear-weir to remove floating substances 3 through the drain pipe 9 by gravity 5. At the lower edge of the conical septum 4, the wastewater stream rotates in the vertical direction, while the rate of precipitation stances will consist of the hydraulic size and particle settling velocity downstream communicating the particles corresponding to the inertia. In this case, settling particles of larger hydraulic size enter the conical housing of the settler 6. Suspended sediment with smaller hydraulic sizes enter the space bounded by the surfaces of the conical septum 4 and the cylindrical housing of the settler 5, which in the horizontal plane has a variable cross-section and a variable upward flow velocity, in as a result of this, a collision of particles occurs, their enlargement, followed by the formation of a suspended layer and an increase in their hydraulic grain nosti (gravitational coagulation). When the critical hydraulic size of the settling substances of small hydraulic size is reached, the particles are deposited and, through the space bounded by the lower edge of the conical septum 4 and the cylindrical body of the settler 5, enter the conical housing of the settler 6 and then through the sediment removal pipeline under hydrostatic pressure 7 together with the large settling substances hydraulic fineness periodically removed outside the conical housing of the sump 6.

The clarified wastewater enters the collecting tray 8 and is transported through the clarified wastewater removal pipeline 10 outside the cylindrical body of the settler 5.

In the inventive design of the sump with a downward-upward flow of wastewater, the hydrodynamic scheme of work is improved in comparison with the prototype.

Claims (1)

A sump with a downward-upward flow of liquid, containing a cylindrical body, a baffle in the cylindrical part of the body, a feed wastewater supply tray, a gear spillway, a bowl for floating substances removal with a floating substances removal pipeline, a sediment removal pipeline under hydrostatic pressure, a collection tray for clarified sewage with a clarified sewage disposal pipeline, characterized in that the partition is conical, while the sump is equipped with distribution pipes, ennymi with a tray feed raw wastewater and disposed in the interior of conical partition, and the bowl for removal of floating substances formed with a notched weir.

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