SU1712319A1 - Sedimentation tank for sewage - Google Patents

Abstract

The invention relates to the treatment of wastewater from suspended substances and can be used in the engineering, mining, metallurgical and other industries. The goal is to increase cleaning efficiency by improving the water distribution and filter regeneration conditions. The sump includes a housing with a settling chamber, a water dispenser, a chamber for collecting sediment, semi-cylindrical screen filters located in the upper part of the chamber, a tray for collecting clarified water, nozzles for supplying and discharging water and for removing sediment. Favorable conditions are created in the sump for water purification and filter regeneration, which, in turn, improves cleaning efficiency. 2 Il., 1 tab., C /) with

Description

The invention relates to devices for the treatment of wastewater from suspended substances, and can be used in the engineering, metallurgical, mining and other industries.

The purpose of the invention is to increase the cleaning efficiency by improving the conditions of water distribution and regeneration of filters.

FIG. 1 shows the sump, general view, section; figure 2 is a semi-cylindrical mesh filter element.

The sump includes a cylindrical body 1 with a settling chamber, a water dispenser 2, a conical chamber 3 for collecting sediment, semi-cylindrical screen filters 4, a tray 5 for collecting clarified water, a branch pipe 6 for supplying the source liquid.

and a pipe 7 for removal of the cleaned liquid, as well as a pipe 8 for removing sediment.

Filters 4 consist of a frame 9 (Fig. 2) forming a semi-cylinder, covered with a kapron or-1 metallic inert mesh 10.

The device works as follows.

Sewage water through the nozzle 6 is fed into the water distributor 2, with the help of which it is evenly distributed over the cross section of the working settling chamber. In the process of lifting the liquid upward, sedimentation of suspended particles to the bottom of the conical chamber 3 occurs. The partially clarified liquid rises and passes through the filtering elements 4, which trap fine particles of suspensions, the clarified water collect trays 5 and

discharged by nozzle 7 beyond the limits of the settler.

As the filter elements become clogged after 8-10 hours of operation, the pipe 8 is opened, the sediment from chamber 3 is removed and sent for further processing, while the water level in the sump decreases sharply, the filter elements (mesh) are washed with a reverse flow of water. The screen of the filter elements is completely washed out. The depth of the net is 0.3-0.35 mm from the water level in the sump. The washed precipitate settles to the bottom of the settler.

Installing a filter element in the sump even in the form of a single semi-cylinder increases the working area of this element by at least 1.5 to 2 times, as a result of which the speed of movement of the fluid being cleaned decreases correspondingly, too, by 1.5 to 2 times, which leads to hydraulic the sump mode does not change to the filter element. AI in the element itself, or after it.

All this leads to an increase in the degree of purification and improvement of the process of regeneration of its external surface.

Three sedimentation tanks of a settling tank, a settling tank with a filtering element in the form of a horizontal grid and the proposed settling tank with a filtering element in the form of a mesh semi-cylinder were tested.

The results of these tests are summarized in the table.

Thus, as can be seen from the table, the proposed device allows to increase the degree of wastewater treatment from suspended solids, to increase the duration of the interregeneration period and thereby reduce the operating costs of treatment. Such a result can be achieved by creating an optimal hydraulic mode of fluid motion, namely, improving the water distribution conditions and regeneration of the filter elements.

Claims (1)

Invention Formula A sump for the treatment of wastewater from suspended substances, including a housing, source water inlet pipe, water distributor, settling chamber, filters with mesh surface installed in the upper chamber MSTI, tray for collecting the clarified liquid and removal pipe sediment, characterized in that, in order to increase cleaning efficiency by improving the water distribution and filter regeneration conditions, the mesh surface of the filters is made in the form of semi-cylinders with a convex side facing in the direction of fluid flow and located at a distance of 0.3-0.35 mm from edges of the catchment tray.