RU227311U1 - RADIAL SETTLEMENT TANK WITH CONICAL BOTTOM - Google Patents

Abstract

The utility model relates to the field of purification of liquid emissions from the mining industry and can be used to release treated wastewater into natural reservoirs. A radial settling tank with a conical bottom contains a settling bowl, a device for cleaning the settling basin, located inside the settling bowl and connected to a movable truss. In this case, the bottom of the sump bowl is made in the form of a cone, the top of which is directed upward, the device for cleaning the sump is made in the form of a scraper connected to the truss at an angle where ϕ is the opening angle of the bottom cone. A drain pipe is located at the bottom of the settling bowl near its side, a drain pipe is installed at the top of the side of the settling bowl, and a supply pipe is located near the farm at a distance equal to 0.1 of the diameter of the settling bowl from it. The technical result is a simplification of the device design. 1 ill.

Description

The utility model relates to the field of purification of liquid emissions from the mining industry and can be used to release treated wastewater into natural reservoirs.

One of the most common devices for this process are radial settling tanks.

A radial settling tank is a round reinforced concrete tank into which clarified water is supplied from below to the center and poured out through a funnel with the wide end facing upward. Around the funnel there is a stabilizer cylinder with a radius with a solid bottom and a perforated wall. The presence of such a cylinder contributes to a more uniform distribution of water over the working height of the sump. Water moves slowly from the center to the periphery and drains into the peripheral gutter.

To remove sediment (sludge), a slowly rotating metal truss with scrapers mounted on it is used, raking the sediment to the center of the settling tank, from where it is continuously or periodically released or pumped out. If there are substances that float to the surface in the water, they are removed by a special device consisting of a board rotating together with a scraper device and a periodically immersed hopper, with the help of which the floating substances, along with part of the water, are removed from the sump.

To rotate the scraper mechanism, the settling tanks are equipped with a peripheral or central drive.

In radial settling tanks, unlike others, the water speed is not constant and varies from a maximum value in the center to a minimum value at the walls of the tank, which negatively affects the performance of the devices [1].

The most significant disadvantages of these devices are the complexity of the design and the difficulty of removing accumulated sludge.

The settling tank described in the patent [2] consists of a tank with a bottom supply of waste water through a central pipe with a valve, equipped with a water distributor for supplying water to the volume of the tank in horizontal planes, containing a means for removing clarified water from it, connected to an outlet pipeline. According to the invention, the central pipe is equipped with a volumetric velocity sensor for the supply of waste water, the water distributor is made in the form of a hollow cylinder with horizontally located outlets that discharge water into the volume at different angles to the radial direction, the means for discharging clarified water consists of a pipe with a closed upper end, having one or two longitudinal cutouts of a given length and width on different parts of the pipe along its height, covering each cutout of a slotted valve adjacent to the pipe, equipped around the perimeter with a sealing element and a means of regulating its position along the height of the cutout in the form of a rod; the outlet pipeline is equipped with a valve and a means of regulating its flow ability, as well as a sensor for the volumetric velocity of clarified water, while the mentioned speed sensors and control means are combined into a system for automatically controlling the speed of removal of clarified water from the tank. A means for removing clarified water is located in the near-wall and/or central zone of the tank with a pipe immersed in the water volume, making it possible to remove water through cutouts from the volume below its level.

The disadvantages of this settling tank include the complexity of its design and the rather high energy costs of its operation.

The closest to the proposed one is the settling tank described in the patent [3]. It consists of a settling bowl, a central support, a movable truss with a peripheral drive system, a device for cleaning the sump located inside the settling bowl and connected to the movable truss, and a settling tank cover, characterized in that the sump cover is located below the movable farm and is attached to the settling bowl.

A significant disadvantage of this settling tank is also the complexity of its design.

It should also be noted that in both settling tanks [2, 3], when the scraper is in operation, the sludge that accumulates at the bottom moves from the periphery to the center, as a result of which the efficiency of sludge removal, and, consequently, the quality of water purification leaves much to be desired.

The technical task of the proposed device is to implement a radial settling tank of a simplified design.

To solve this problem, we propose a radial settling tank with a bottom made in the form of a cone, the top of which is directed upward.

The structure of this settling tank is shown schematically in Fig. 1.

The bowl 1 of the radial settling tank has a cylindrical shape, the bottom of the bowl is made in the form of a cone, the top of which is directed upward.

In the settling bowl there is a movable truss 3 located coaxially, connected to the scraper 4 at an angle

where ϕ is the opening angle of the bottom cone.

A drain pipe 5 is located at the bottom of the bowl near its side. A drain pipe 6 is installed at the top of the bowl side.

The radial settling tank works as follows.

Contaminated water 2 is supplied to bowl 1 through supply pipe 7. The supply pipe is located near farm 3 at a distance from it equal to 0.1 of the diameter of the settling bowl.

Sludge from contaminated water settles on the conical bottom of the settling tank. The rotation of farm 3 sets in motion the scraper 4 connected to it, which scrapes settled sludge from the bottom surface and moves it to the drain pipe 5. The sludge through pipe 5 is removed from the settling tank by gravity. Clarified water is pumped out of the sump through drain pipe 6.

The proposed settling tank has the following advantages:

1. Contaminated water is poured through the supply pipe into the sump bowl as close to the center as possible, then moves to the peripheral part of the sump. Since the bottom cone is directed upward, contaminated water travels a longer path as it approaches the periphery, and therefore sludge is deposited more efficiently.

2. Sludge is removed through a drain pipe in the peripheral part of the settling tank, located near the side of the bowl, where the flow rate of water supplied to the settling tank is low, therefore, the sludge in the water is less agitated by the scraper. In addition, the reduced volume of the area near the side of the bowl, where sludge accumulates, due to the shape of the bottom, also helps to reduce the mixing of water with the slurry agitated by the scraper with the upper layers of already clarified water.

3. Contaminated water is supplied from above through the supply pipe, which greatly simplifies the design.

The technical result of the implementation of the utility model is the expansion of the model range of radial settling tanks of a simplified design.

Used sources

1. Sidorova L.P. Methods of industrial and waste water treatment. Part I. [Electronic resource] // Federal State Autonomous Educational Institution of Higher Professional Education, UrFU, 2012. - 134 p. pp. 6-7. URL: https:// study.urfu.ru/Aid/Publication/11787/1/Sidorova_i_dr.pdf (access date 03/14/2024).

2. Patent RU 2522653 C1, Russian Federation, IPC B01D 21/00 (2006.01) C02F 1/00 (2006.01). Radial settling tank / Mazitov L.A., Finatov A.N., Finatova I.L., - No. 2013102005/05, appl. 01/17/2013, publ. 07/20/2014.

3. Patent RU 2636970 C1, Russian Federation, IPC E03F 5/14 (2006.01) B01D 21/06 (2006.01). Radial settling tank with overlap / Kuryatnikov E.A., Kuryatnikov L.A., - No. 2016138715, appl. 09/30/2016, publ. November 29, 2017.

Claims (4)

A radial settling tank with a conical bottom containing a settling bowl, a device for cleaning the settling basin, placed inside the settling bowl and connected to a movable truss, characterized in that the bottom of the settling bowl is made in the form of a cone, the apex of which is directed upward, the device for cleaning the settling basin is made in the form of a scraper connected to the truss at an angle where ϕ is the opening angle of the bottom cone, A drain pipe is located at the bottom of the settling bowl near its side, a drain pipe is installed at the top of the side of the settling bowl, the supply pipe is located near the farm at a distance equal to 0.1 of the diameter of the settling bowl from it.