SU1159893A1 - Arrangement for purification of waste water - Google Patents

Description

The invention relates to devices for the purification of highly concentrated wastewater containing emulsified, colloidal substances, fats, suspended solids, and can be used for the treatment of wastewater in various industries.

A device for wastewater treatment is known, comprising a housing with a flotation chamber and a conical bottom, 10 aerators, a preliminary aeration chamber / flocculation chamber, a large-pored filter element mounted on the supporting wall between the pre-aeration chamber and the wall 5 of the housing 5; waste water [1].

A disadvantage of the known device is the lack of possibility of washing the filter element, which 20 leads to its gradual clogging with particles of pollution, resulting in a decrease in the performance of the device, which requires periodic 25 shutdown of the device from work in order to flush the filter element, without turning off the device, its reliability decreases .

The purpose of the invention is to increase the productivity of the device and the reliability of its operation by alternately washing the filter elements.

This goal is achieved by the fact that in a device comprising a housing with a conical bottom, a flotation chamber and a preliminary aeration chamber with aerators, a flocculation chamber, a large-pore filtering element 40 on the supporting grid and precast trays, a pre-aeration chamber with a flocculation chamber is located in the center of the housing, the device is equipped with an additional filter element 45 and vertical partitions, spaced between the flotation chambers and filter elements and forming the supply chambers Sewage water having movable dampers with vertical rods and rods, as well as a device provided with vertical pipelines communicated with collecting trays with branch pipes horizontally located on the outside of the housing 55 with piston valves in the lower part and connectors with damper rods, and filter elements are equipped with nets horizontally placed above it.

FIG. 1 shows the proposed device, a top view of ·, FIG. 2, section A-A in FIG. one.

The device for wastewater treatment comprises a housing 1 with a conical bottom 2, flotation chambers .3 and aerators 4 located on either side of the flocculation chamber 5.

A cylindrical pre-aeration chamber 6 is installed in the center of the chamber 5 with an aerator 7. In the upper part of the chamber 5, exhaust ports 8 are made. The device contains filtering elements 9 made in the form of a granular load located between the horizontally installed grids 10. Filtering elements 9 are separated from the chambers 3 flotation vertical partitions 11 and 12, forming chambers 13 and 14 for supplying wash water, the lower part of which is equipped with movable gates 15 and 16 hinged on the partitions 12. To turn off filter elements 9 of the operation and opening of chambers 13 and 14 for supplying wash water; flaps 15 and 16 are equipped with rods 17. To collect purified water, the device is equipped with collecting trays 18. Wash water is discharged through pipelines 19 through nozzles 20 in which piston valves 21 are installed, connected by means of 22 with-valves 15 and 16. Through pipelines 19 prefabricated trays 18 are connected with nozzles 20. Discharge of purified water from the device is carried out through pipelines 23, and removal of sediment from the conical bottom 2 · is carried out in tons pipeline 24.

Foam from the surface of the liquid chambers 3 flotation is given in the collection trays 25 foam.

The device works as follows.

Waste water and excess activated sludge is fed into the pre-aeration chamber 6, where it is subjected to intensive aeration with air through the aerators 7. From the chamber 6, the mixture enters the flocculation chamber 5, where the formation of active sludge flakes takes place. Through the window 8, the mixture enters directly onto the foam layer into the chambers 3 fpotaiii, where it undergoes flotation purification using

3

With the aid of air bubbles fed through small-porous aerators 4. Foam from the surface of the liquid of the flotation chambers 3 is continuously removed to the foam discharge trays 25. The purified water from the chambers 3 enters the lower conical part 2 of the device, where the deposition of non-flooded impurities occurs. The clarified water from the lower conical part of the housing enters the filtering elements 9, passing through which the water is subjected to final purification from bottom to top, which are not floated in chambers 3 and not settled on the bottom 2. After a certain time of operation of the device, one of the filtering elements 9 is turned off ( Fig. 2) movable valve 15 for flushing. Using the valve 15 opens the chamber 13 for supplying wash water from above to the filter element 9 and automatically with the help of the valve 21 opens the pipeline 19 for draining the wash water. The access of the clarified water from the conical part of the housing to the filter element 9 from below stops. The clarified water through the chamber 13 enters the filter element 9 from above and washes it, while the lower retaining mesh 10 prevents the granulated material from the filter element 9 from being carried along with the washing water. At the same time, pipeline 19 discharges unfiltered water from the collecting tray 18, which enters the tray during the initial washing period of the filter element 9. At the time when one of the filter elements 9 is in the washing and the second is in operation, the damper 16 is the rod 17

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raised up and thus the chamber 14 for supplying the washing water is closed, the clarified water from the lower conical part of the device steps 5 down to the filter element 9, the granular material of which is kept from being removed with purified water by the upper retaining mesh 10. Passing through the filter element 9 Yu from bottom to top , clarified water undergoes final cleaning. As the second filter element is clogged with dirt particles, it is washed in the same way as washing the first filter element 15.

When the filter element 9 is in operation (for example, left, Fig. 2), the valve 16, the stem 17 raised upwards, the chamber 14 is closed, this automatically closes the pipeline 19 by means of the valve 21. The purified water enters the collection tray 18 and further along pipeline 23 it is diverted from the station. The sediment from the lower conical part 2 of the device is periodically removed by pipeline 24.

The washing of the filtering elements 9 is carried out periodically at least 30 of their clogging with particles of pollution, while the washing is carried out alternately: when one of them is washed, the second is in operation.

The proposed device improves performance and reliability by periodically washing the filter elements, as a result of which the performance of the filter elements is not reduced, and the device is not disconnected from operation at the time of washing the filter elements.

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Fig 2

Claims (1)

DEVICE FOR CLEANING WASTE WATER, comprising a body with a conical bottom, a flotation chamber and a preliminary aeration chamber with aerators, a flocculation chamber, large-pore filtering element on the supporting grid I am prefabricated trays, characterized in that, in order to improve the performance of the device and its reliability in the work by alternate washing filter elements, a preliminary aeration chamber with a flocculation chamber is placed in the center of the body; the device is equipped with an additional filter element and vertical partitions located between the flotation chambers and filter elements and forming washing water supply chambers with movable dampers with vertical rods and rods, as well as -. The vertical pipelines with branch pipes horizontally located on the outer side of the housing in its lower part and having 5 piston valves, communicated with collecting trays, the latter are connected to the rods of the dampers, and the filter elements are provided with nets placed horizontally above them. FIG. one 1 1159893 2