SU1299607A1 - Installation for clarifying circulating water - Google Patents

Abstract

The invention relates to the field of purification of circulating waters of enterprises and is intended to clarify slurries of waste flotation. The aim of the invention is to increase the degree of cleaning and performance of the plant. The apparatus for clarification of circulating water contains a cylindrical mixing chamber 1, to which the flocculation chamber 10 is connected with the flocculatory feed device 14 introduced into it, a radial thickener 17. The mixing chamber is equipped with a tangential nozzle 2 for supplying the suspension and a flocculant feed device, and the flocculation chamber / X JL is made in the form of a hydrocyclone with a tangential inlet 9, a suspension, the flocculant feeding device is installed in the gap between the side wall of the hydrocyclone and the drain patra block 12, which is connected using a pipe 16 or tray radial thickener. The mixing chamber 1 contains a supply pipeline 4 located on the axis of the chamber and connected to the collector 5, from which the feed tubes 6 radially diverge with openings in their lower part, turbulizing plates 7 are installed between the feed tubes and at the same level with them. At the outlet of the tangential inlet inlet in the flocculation chamber, there is a swirl element 13, behind which there is a flocculant supply device 14 containing a pipeline with radially diverging radially sloping from swirling on the element feeding tubes of varying lengths. A cone-shaped insert is installed on the drain pipe in the flocculation chamber. 3 hp ff. 2 Il. S (L to G) with O5 fig, 7

Description

The invention relates to the purification of recycled water in plants and can be used to clarify slurries of waste flotation.

The purpose of the invention is to increase the degree of cleaning and performance of the plant.

In Fig.1 schematically shows the installation, the General view; figure 2 - section aa in figure 1.

The installation includes mixing chambers 1, in the upper part of which a tangential nozzle 2 is installed for supplying a suspension, in the lower part of a nozzle 3 is for withdrawal. On the axis of the mixing chamber there is a pipeline for supplying flocta nta 4, connected to the collector 5, to which the feed tubes 6 are also connected with openings in their lower part, turbulizing plates 7 are installed between the tubes. The feed tubes b and plates 7 are fixed on one side the manifold, and on the other, to the wall of chamber 1. The branch pipe 3 is connected via a pipe 8 to a tangential pipe 9 installed on a flocculation chamber 10, in the lower part of which there is a sand outlet 11. In the upper part of the chamber 10 there is a drain tubes 12. With a spinning nozzle 9 is aligned member 13 (formed as a blade axially zavih- erator) attached to the wall of the housing, with the swirl element installed feed device 14 as a flocculant supply line with feeding tubes. A cone 15 is connected to the nozzle 12 in its lower part. The nozzle 12 is connected to a radial thickener 17 by means of a pipe 16.

The installation works as follows.

The suspension through the pipeline and the nozzle 2 enters the displacement chamber 1, in which the flow is twisted. A flocculent feed unit is passed through, the flow is additionally turbulized by plates 7. Flocculatables are supplied to the highly turbulized flow from the holes in the supply tubes 6, flocculatings to these tubes come from the supply pipe 4 and the collector 5. as a result, a lot of small flocs are formed, but with strong connections. These floccules will be more dense. The holes on the supply tubes should be located no closer than 0.1 of the chamber diameter, since large particles in the chamber due to the "growth of the suspension" will be located near the side walls of the chamber. These particles are easily removed without flocculation and it is impractical to spend flocculants on them. The suspension from chamber 1 for mixing through pipe 3, pipe 8 and pipe 9 is fed tangentially into camera 10 for flocculation. The flow after passing through the swirl element 13 also twists around its axis, further

the flow flows around the flocculant feed unit 14. The device is made of feed tubes inclined in the direction of suspension movement, which reduces turbulization

. Otok, the tubes are round and flow around well. In addition, the diameter of the chamber for. the flock ;, the 1TH, should be chosen 2-4 times the size of the chamber for displacement, which allows to reduce the shear stresses in the flow. Particles are attached to the small floccules, but due to small shear stresses the breaking of the bonds does not occur. The flow moving in the gap between the discharge nozzle 12 and the wall of the chamber 10 falls into the narrow part of the gap formed by the cone 15. Here the flow swirl around its axis created by the swirler 13 and the intensive mixing that changes the flow structure occurs. The flow rotating around the axis of the chamber passes through the flocculation chamber, turns and is removed through the drainage pipe 12 and further along the conduit 16 by gravity into the radial thickener 17. Large particles and floccules under the action of the centrifugal field fall on the walls of the chamber 10, roll down and remove through the sand fitting 11, and the small flocculi are removed to the radial thickener.

Thus, only a part of flocculated particles is removed to the radial thickener, i.e. the concentration of the solid phase becomes small in the radial thickener, which accelerates the deposition of particles (there is no constraint condition). In addition, as the floccules became denser, their sedimentation rate increased. The flocculant consumption is reduced due to its uniform input over the cross section of the chambers and intensive mixing. Improving the conditions of mixing flocculus with the suspension leads to the fact that the entire volume of the suspension will be treated with flocculation, i.e.

there will be parts of the volume not treated with flocculant, which increases the degree of purification. Increasing the deposition rate of particles allows an increase in the flow rate of the suspension, i.e. the capacity of the plant.

45

Claims (4)

1. An apparatus for clarifying circulating water, comprising a mixing chamber in which a flocculating feed unit is located, a flocculating chamber with a flocculating feed unit, a radial thickener, characterized in that, in order to increase the degree of purification and capacity, the displacement chamber is cylindrical and equipped with a tangential pipe for supplying the suspension, the chamber for flocculation is made in the form of a hydrocyclone with a tangential pipe for supplying the suspension and a central drain pipe connected by pipeline with a radial thickener, while the device for feeding flocculant is installed in the gap between the side wall of the hydrocyclone and the drain pipe. 2. Installation according to claim 1, characterized in that the node for supplying flocculation is made in the form of a central supply pipe and annular manifold with radial tubes having openings in their lower part, and the mixing chamber is equipped with turbulizing plates located between feeding tubes. 3. Installation on PP. and 2, characterized in that the flocculation chamber is provided with a swirl element mounted at the outlet of the suspension supply pipe, and the flocculant delivery device is made in the form of a pipeline with supply tubes of different lengths, installed with an inclination to the center of the chamber. 4. Installation according to claims 1-3, characterized in that the flocculation chamber is provided with a cone-shaped insert mounted on the drain nozzle.