SU429030A1 - DEVICE FOR CLEANING WASTE WATERTV ^ w - Google Patents

Description

one

This invention relates to wastewater treatment plants.

A sewage treatment unit is known, comprising a housing divided by chambers into chambers and equipped with pipes for supplying an air / water mixture, a device for recirculating purified water, a coagulum feeder and a scraper mechanism.

However, in the known device, the speed and residence time of the water in the hydrocyclone and the deep cleaning chamber is insufficient, which degrades the quality of the purified water, especially at low temperature and alkalinity of the source water.

The purpose of the invention is to intensify the coagulation and flotation processes.

For this, in one of the chambers there is a cylindrical vessel closed on top with a tangential flow inlet at the top and a bell at the bottom, and the pair partitions form slots in which pipes for air supply are installed.

The drawing shows a device for wastewater treatment.

The device comprises a housing 1 separated by paired partitions 2 into chambers and equipped with pipes 3 for supplying an air / water mixture, a device 4 for recycling purified water, a dispenser 5 coagulant and

using a scraper 6. In one of the chambers there is a cylindrical vessel 7 closed on top with a tangential inlet 8 at the top and a bell at the bottom. In addition, paired partitions 2 form slots in which pipes 3 are installed for supplying air.

The device works as follows. Purified water from the averager 9 pump or hydraulic elevator 10 is fed into the vessel 7 through

a tangential pipe 8, the coagulant solution from the tank 11 and the water / air mixture from the pressure tank 12 are fed through the pipe 3 by the dispenser 5 through the pipe 3. Due to the tangential entry in the cylindrical part of the vessel, the water acquires a rapid rotational motion and is vigorously mixed with the coagulum solution and the water / air mixture. Stirring is continued for 15-20 seconds, after which the water passes into the expanding part of vessel 7, where

its rotation slows down and, when it leaves the mixer, goes into a slow upward circulation, facilitating the formation of coagulum flakes, their flotation separation from the water by evolving air bubbles and uniform distribution of water over the cross section of chamber 13. From chamber 13, the water being cleaned passes into the chamber 14 between the paired guide partitions 2 forming a slit of variable cross section. In the narrowing of the gap through the pipe 3, the water-air mixture from the tank 12 is reintroduced into the purified water. The increased flow rate in this cross section ensures uniform mixing of the purified water with air bubbles, which in the chamber 14 float the remaining contaminants in the water. This process is repeated in the second or several subsequent chambers 14, then the water enters the settling chamber 15, where small air bubbles are emitted from it. The purified water passes under the partition wall and is poured into the pocket 16 through the spillway. From the pocket 16, some of the water is taken in by pump 17, saturated with air using an ejector 18 and fed into chamber 1, from where the water-air mixture is sent back to the flotation device. The remaining part of the treated water is discharged into the sewer system or reused for technical purposes. Foam accumulated on the water surface

dumped with a scraper 6 into the foam collection pocket 19.

Subject invention

Claims (2)

1. A device for sewage treatment, including a housing divided by paired partitions into chambers and equipped with pipes for supplying a water-air mixture, a device for recirculation of the treated water, a coagulant dispenser and a scraper mechanism, characterized in that, in order to intensify the processes of coagulation and flotation, a cylindrical vessel with a tangential inlet at the top and a socket at the bottom is installed in one of the chambers. 2. A device according to claim 1, characterized in that the pair partitions have slots in which pipes for air supply are installed. ///////// TT ifi f / 10 HXl-LZJ- (Xl-rtxh