SU565885A1 - Apparatus for separating active sludge from treated sewage water - Google Patents

Description

ka, as well as pockets dp sediment and purified water 2J.

The machine operates on the principle of flotation devices. The initial row water with a small amount of purified water, saturated with air, is fed to the free-flow hydrocyclone chamber coarse. Further purification of wastewater is carried out in three successive chambers, where part of the recirculated treated wastewater enters through perforated pipes. The final wastewater treatment is carried out in a settling chamber. The precipitate is collected by scrapers. And transported into one pocket, and the treated wastewater is collected into another pocket,

The considered devices are ineffective for separating activated sludge from treated wastewater, i.e., they are inefficient in terms of capacity per unit volume of the device and have a low percentage of recovery of silt and water. This is due to its hydrophilicity, which leads to low adhesion of air bubbles to the surface of sludge flakes, low flake strength, and their high compressibility.

The device closest to the invention for separating activated sludge from treated wastewater contains a reservoir within which there is an air distributor and filter elements equipped with a filtrate outlet and separated active sludge s.

However, the filter elements in such a device are made flat with a small working surface. The water is filtered through a silt underlayer with high resistance. When the device is in operation, the fabric of the filter elements is quickly blocked, and there are no solutions for regenerating the filter elements in the device. The device has low productivity, allows to concentrate the sludge by suction and filtration only up to 6 g / l.

The purpose of the invention is to increase the degree of concentration of activated sludge and the implementation of the regeneration of filter elements,

This is achieved by the fact that the filtering elements of the device have a positive taper of the sides, equal to 1: .20-1; 25, and are installed vertically, directly above the water-air distributor.

The implementation of filtering elements with a positive taper of the sides, equal to 1: 20-1: 25 {found empirically), ensures sufficient regeneration of the filtering tissue and prevents air from entering the filtrate chamber, and also creates 60

slight resistance to ulo-air flow. This allows the device to separate the active substance from the treated wastewater in a case, bringing its concentration by filtration and flotation to 30-40 g / l,

FIG. 1 shows the proposed device, a general view; in fig. 2 shows section A-A in FIG. one.

The device comprises a reservoir 1, inside of which are located the water-air distributor 2 and filtering elements 3, consisting of cartridge filters fixed in tube plates 4, which are fastened together by means of straps 5,

The filter elements 3 are provided with an annular chute 6 for removal of the filtrate and a chute 7 for removing the separated active sludge, installed vertically, directly above the air-distributor 2. In the upper part of the device there is a truss with scrapers 8 and a platform 9 for servicing the device. In the lower part of the tank 1 are located the supply pipe 10 of the source waste water and the pipe 11 supplying part of the treated waste water saturated with air, a pipe 12 for discharge of precipitated sludge and emptying the tank.

The device works only as follows.

Into the air-air distributor 2, the source 1.0 feeds the original sludge wastewater and at the same time, through the pipeline 1 1 - a part of the previously purified water with air dissolved in it at a pressure of 3-4 atm. The incoming water by the water-distributor 2 is evenly distributed throughout the bottom of tank 1. The sludge is concentrated along the surface of the wastewater by removing water through the surfaces of the filter elements 3, this is also facilitated by partial suspension of the suspension with air bubbles, pushing it up and sealing. Air bubbles rising upward carry out continuous regeneration of filleting tissue. Extruded to the surface of the water, concentrated sludge is scraped by scrapers 8 and discharged along the channel 7 from the device. The filtrate is discharged through an annular gutter 6, partly for recirculation, and the remainder is discharged into the sewer.

A device for separating activated sludge from treated wastewater was tested at the Baikal Pulp Mill. The test results are shown in the table. For comparison, the table shows the data on the separation of activated sludge carried out on other devices.

0.3-0.4

Sludge compactor

2.0-2.5 Flotator

Proposed

2O, O-25.0 device

In all cases, the initial active sludge concentration was 4-5 g / l.

As follows from the table, the proposed device has undoubted advantages over the known ones.

In addition, activated sludge, separated from treated wastewater using the proposed device, is of high quality and can be further processed in order to obtain feed additives with a low cost.

Claims (3)

1. USSR author's certificate No. 179244, KL.EO2 a25 / 14, 17.12.63. 2. USSR author's certificate No. 336277, cl. C O2 C 1/26, 17.02.66. 3. US patent number 3764525, kl.21O-15, 09.10.73. 0 FIG. 2