RU241920U1 - Two-section sedimentation tank with inclined bottoms - Google Patents

Abstract

The utility model relates to the treatment of liquid waste from the mining industry and can be used to discharge treated wastewater into natural bodies of water or for industrial purposes. A two-section settling tank with inclined bottoms comprises a housing with a bottom inclined in the direction of wastewater flow, pipes for supplying wastewater and discharging treated water, a sludge collector, and a discharge valve. The housing consists of two sections. The first section has a wastewater inlet pipe in the upper part, and a pipe for supplying water pressure via a pump in the lower part. The sections are separated by a partition repeating the shape of the wall and bottom of the first section and equipped with a mesh filter in the vertical portion. The second section is equipped with a pipe for discharging wastewater. 1 Fig.

Description

The utility model relates to the field of purification of liquid emissions from the mining industry and can be used to discharge purified wastewater into natural reservoirs or for technological needs.

One of the most common devices for this process is a settling tank with a sloping bottom (the word "bottom" is plural). The most significant drawback of these devices is the difficulty in removing the accumulated sludge.

Horizontal settling tanks described in patents [2, 3, 4] were taken as analogs.

The settling tank described in the patent [2] has a fairly simple design and operates in one of two modes:

1. Direct water clarification. Wastewater is fed into the settling tank, the sludge accumulates at the bottom, and the clarified water is discharged into a natural reservoir.

2. Sludge dewatering. The flow of wastewater into the tank is stopped, the water above the sludge layer is drained, and the accumulated sludge is then removed through a valve. After the accumulated sludge is removed, the settling tank is ready for the next cycle.

The disadvantages of the settling tank described in the patent [2] include the following:

1. This settling tank has a horizontal bottom, as a result of which the accumulated sludge is not completely removed.

2. The filter installed in the drainage system of this septic tank becomes clogged quite quickly, which, in turn, requires fairly frequent replacement of this filter, and, consequently, additional capital costs.

The settling tank described in the patent [3] operates as follows. Wastewater is fed into its body, sludge accumulates at the bottom, and the clarified water is discharged to its intended destination (for process needs or into a natural reservoir). When the accumulated sludge level reaches a certain level, the wastewater supply is stopped, and the water above the sludge layer is released from the body and also directed to its intended destination. Then, using a vacuum created by a rather complex system, the sludge is dewatered (this process is completed in several cycles). The dewatered sludge is then removed from the body using a grab crane.

The disadvantages of the settling tank described in the patent [3] include the following:

1. Quite a complex device.

2. The operation of this settling tank requires very high energy costs.

3. This settling tank also has a horizontal bottom, as a result of which the accumulated sludge is not completely removed.

The settling tank described in the patent [4] and accepted as the closest analogue operates as follows. Wastewater is fed into a housing equipped with a sludge collector and a bottom sloping in the direction of water flow, with the feed pipe located below the upper edge of the sludge collector. A deflecting baffle, installed behind the sludge collector, forces the water flow to be pressed against the bottom of the settling tank. Thus, large particles settle in the sludge collector, and small ones are carried away by the flow to the discharge point. Moreover, as the flow moves, small particles settle and accumulate in a pocket formed by the sloping bottom, from which the entrained particles are periodically removed through a drain pipe with a valve. A catch mesh, located in front of the purified water drain pipe, is designed to capture floating particles. The piston, manually actuated by a rod, is in its uppermost position. As sludge accumulates in the sludge collector, the piston is lowered into the collector, coaxially pressing the sludge. The threaded lid of the sludge collector is then unscrewed, and the accumulated sludge is removed. After the threaded lid is screwed back on, the piston returns to its uppermost position, collecting a fresh batch of sludge.

When the piston is lowered into the sludge collector, it closes off its lower portion, thereby isolating the area beneath the piston from the water flow. This means that when the cap is unscrewed, only the accumulated sludge is removed without any leakage of treated water from the settling tank. After this, the cap is screwed back on, and the piston returns to its highest position.

The disadvantages of the settling tank described in the patent [4] include the following:

1. Manual drive of the sludge collector piston.

2. The need to manually unscrew and screw the lid on the bottom of the sludge collector, which has a fairly large mass.

3. Incomplete removal of sludge through carryover due to settling at the bottom of the settling tank.

The technical task of the proposed device is to remove sludge from purified water.

To solve the technical problem, we propose a two-section settling tank with inclined bottoms. The design of this settling tank is shown in Fig. 1, where:

1 - the first section of the settling tank,

2 - mesh filter partition separating sections 1 and 3,

3 - the second section of the settling tank,

4 - pump,

5 - sludge collector,

6 - valve.

The proposed settling tank operates as follows. The settling tank body consists of two sections. Contaminated water enters the first section of the settling tank, section 1, through a wastewater inlet pipe located at the top of section 1. Sludge contained in this water settles to the bottom of section 1. The bottom of section 1 is inclined in the direction of wastewater flow. A pipe is located at the bottom of section 1 for supplying water via pump 4, which flushes the accumulated sludge into sludge collector 5. Then, as the sludge accumulates, the discharge valve 6 opens, removing the sludge and water mixture from sludge collector 5 and sending it for disposal. The partition separating sections 1 and 3 of the settling tank follows the shape of the wall and bottom of section 1 and is equipped with a mesh filter 2 in its vertical section. As the first section of the settling tank fills with purified water, it passes through filter 2 into section 3 of the settling tank, further removing sludge. Purified water from section 3 is then discharged through the purified water outlet pipe into natural bodies of water or used for process needs. Filter 2, as it becomes clogged, must be either cleaned or replaced.

The proposed two-section settling tank with inclined bottoms has the following advantages:

1. When passing through the first section of the settling tank and the mesh filter partition, contaminated water undergoes two stages of purification, as opposed to one in the closest analogue.

2. The underwater pressure created by the pump significantly reduces the settling and caking of sludge at the bottom of the first section of the settling tank and, thus, ensures maximum removal of sludge through carryover from the settling tank.

The technical result achieved by the proposed device consists of purifying wastewater with effective removal of sludge through entrainment from the bottom of the settling tank.

Sources used:

1. http://www.gaps.tstu.ru/win-1251/lab/sreda/ope/ob_ecol_html/otstoi.html [Electronic resource]: Sedimentation tanks. Tambov State Technical University.

2. Patent RU 2286197 C2, Russian Federation, IPC B01D 21/00 (2006.01). Horizontal settling tank / Galkin Yu.A., Ulasovets E.A., Sidorova E.A., - No. 2004137259/15, appl. 12/20/2004, publ. 10/27/2006.

3. Patent RU 2618063 C1, Russian Federation, IPC B01D 21/02 (2006.01) B01D 36/04 (2006.01) C02F 11/12 (2006.01) C02F 103/10 (2006.01). Horizontal settling tank with vacuum sludge dewatering / Stalinskiy D.V., Mantula V.D., Epshteyn S.I., Nikulin S.E., Muzykina Z.S., Shlyakhova Yu.A., Cheprakova Ya.A., - No. 2016102224, declared 25.01.2016, published 02.05.2017.

4. Patent RU 227351 U1, Russian Federation, IPC B01D 21/02 (2006.01) B01D 21/24 (2006.01) SPK B01D 21/02 (2024.01); B01D 21/24 (2024.01). Horizontal settling tank with an inclined bottom / Neverov E.N., Gorelkina A.K., Mikhailova E.S., Fuks M.L., Utrobina T.A., - No. 2024109540, appl. 04/09/2024, publ. 07/17/2024.

Claims (1)

A two-section settling tank with inclined bottoms, comprising a body, the bottom of which is made inclined in the direction of movement of waste water, pipes for supplying waste water and draining purified water, a sludge collector, characterized in that the settling tank body consists of two sections, in the upper part of the first section there is a pipe for supplying waste water, and in the lower part there is a pipe for supplying water pressure, the sections are separated by a partition repeating the shape of the wall and the bottom of the first section and equipped in the vertical part with a mesh filter, in the second section there is a pipe for draining waste water.