SU969287A1 - Settling tank - Google Patents

Description

(54) DRAWER

one

The invention relates to devices for the treatment of wastewater from suspended solids and can be applied in ferrous metallurgy, mechanical engineering, the petrochemical industry and other areas of the national economy.

An open hydrocyclone-settler is known, which includes a cylindrical body with a conical slag-accumulating chamber, a central shaft, a tangentially installed branch pipe for supplying clarified water and a branch pipe for discharging clarified water and oil, an annular partition with a flare that does not reach the bottom of the body and forms a chamber with the central shaft wall centrifugal clarification, and with a cylindrical body - a gravitational clarification chamber 1.

The disadvantage of this design is the low degree of wastewater treatment, since the separation of the solid phase from the liquid is carried out only by the centrifugal movement of the liquid in the central part of the sump in the case of non-reagent treatment of the liquid.

Closest to the present invention is a settling tank, comprising a housing with concentric central and peripheral partitions, a central supply and a peripheral drain of the treated medium 2.

A disadvantage of the known construction is that the mixing in the central part of the settler is carried out mechanically. In addition, there are no conditions for flocculation in the precipitation zone.

The known constructions of the settling tanks do not allow to increase the specific hydraulic load (specific capacity) while maintaining a high degree

15 wastewater treatment.

The purpose of the invention is to increase the capacity of the settler by providing a flocculation process in the peripheral flocculation zone and partly in the sedimentation zone 20.

The goal is achieved by the fact that a settling tank comprising a housing with central and peripheral partitions dividing it into three zones, central

tangential inlet and peripheral outlet of the treated medium, provided with an additional tangential supply of the processed medium located in the peripheral zone, and the central and peripheral partitions in the lower part are equipped with tangential diversions located in the same horizontal plane.

FIG. 1 shows the sump, general view; in fig. 2 - the same plan view.

The sump includes a cylindrical-conical body 1, inside which there are central cylindro-conical 2 and peripheral cylindrical 3 partitions dividing its volume into three zones: the central flocculation zone, the peripheral flocculation zone, the deposition zone.

In the conical part of the central partition 2 and in the lower part of the peripheral partition 3 tangential taps 4 are installed, located in the same horizontal plane. The feed pipe 5 is connected to a distribution device made in the form of pipes with tangential nozzles 6 located in the upper part of the central and peripheral flocculation zones.

The sewage collection and removal system is made in the form of a toothed spillway 7 and a tray, and the scraper farm 9 with the sludge discharge pipe 10 forms the sludge removal system.

The sump works as follows.

The processed medium, for example, wastewater containing suspended solids and reagents-flocculating agents, through supply pipe 5 through a distribution device made in the form of pipes with tangential nozzles 6, flow simultaneously into the central and peripheral flocculation zones formed by the central 2 and peripheral 3 partitions . The tangential flow of wastewater gives them a rotational-downward movement in the flocculation zones. In this case, favorable conditions are created for the formation of aggregates of mechanical impurities. Gradient coagulation in a rotating flow occurs as a result of collision of particles in the presence of reagents-flocculating agents.

The largest aggregates of mechanical impurities are deposited in the flocculation zones, and the rest of the suspension flows through the tangential taps 4 into the deposition zone. With the help of tangential taps, a rotational-upward movement of sewage is created in the sedimentation zone, which contributes to additional coarsening of the aggregates of mechanical impurities and improves their sedimentation, i.e., the conditions for suspension flocculation are created in the sedimentation zone. The precipitate deposited in the sedimentation zone is transported by the scraper farm 9 to the conical part of the sump body 1 and is discharged through the sludge pipe 10 for further processing. The clarified wastewater through the toothed overflow 7 is collected in tray 8 and discharged outside the sump.

The advantage of the proposed settler design is the combination of two flocculation zones and a sedimentation zone in one structure, which makes it possible to maximize the use of flocculation mixing in order to intensify the enlargement of mechanical impurities, and consequently, significantly increase the productivity and efficiency of its work. The flocculation in both flocculation zones is provided by the tangential supply of the treated water, which simplifies the operation of the sump compared to other known devices.

Tangential retraction allows the rotational flow of water to be created in the sedimentation zone, which contributes to the additional coarsening of the suspension, and consequently, the efficiency of water purification increases.

Claims (2)

1. USSR author's certificate number 701951, cl. C 02 C 1/26, 1977. 2. US patent number 2573941, cl. 210-16, 1977 (prototype). / V / 7 1 /