SU929598A1 - Displacing aerotank - Google Patents

Description

(5) AEROTEN-REPEATER)

I

This invention relates to biological sewage treatment, and more specifically to aerotanks of displacers.

An aeration displacer is known, comprising a housing divided into a number of chambers by transverse non-bottom-dividing partitions with visors forming communicating zones, each of which has an aerating device LI J.

However, in these aeration tanks there is a mixture of silt from different zones differing in the qualitative composition, as a result of which each zone cannot form its optimal and stable biological complex in accordance with the change in the rate of removal and oxidation of contaminants. In addition, the circulation of fluid, caused by the action of aeration devices in zones, facilitates the transfer of activated sludge from subsequent zones to

| Dydushchis and violation of individual biocenosis in zones. The consequence of this transfer or return of sludge is the loss of the positive properties of sludge, specialized in zones according to the speeds of the oxidation process in them, conditions arise for microbial antagonism, which reduces the cleaning capacity of the sludge.

ten

Also known is an aerotank displacer, which includes a rectangular tank, equipped with transverse non-bottom-dividing partitions with canopies, which form communicating chambers, which have an aerating device. In addition, it is equipped with dividing walls made in the form of blinds, having in the upper and

I bottom solid bump stops, and a package of inclined plates placed respectively before and after each transverse partition 1.2.

The well-known aerotank displacer has inherent drawbacks in terms of the complexity of the individual creating biocenosis and the lack of controllability of active sludge concentrations in the chambers. The flow of the non-separated sludge behind the partition back into the previous zone does not completely solve the problem of differentiating the individual biocenoses in the chambers.

The aim of the invention is to increase the efficiency of use by providing increased individuality of the biocenosis and controllability of active sludge concentrations in the chambers.

To achieve this goal, an aerotank displacer, including a rectangular tank, equipped with transverse, vertical walls that do not reach the bottom, has a block of gravel in its lower part, the lateral surface of which is bordered by a grid. The unit is periodically flushed with one of the known methods air, water and air, etc.} to maintain a controlled difference in the concentrations of activated sludge between the chambers.

The drawing shows the proposed aerotank propellant.

In the rectangular tank 1, comprising an inlet pipe 2 and an outlet pipe 3, transverse partitions t are installed. The partitions divide the tank into a number of chambers 5. Pneumoelectric aerators 6, combined with common pneumatic line 7, are introduced into each chamber. from mesh frame 12 filled with gravel.

As one of the options, the washing of the blocks 11 is carried out with air using a pneumatic line 7.

Aero-propellant works as follows.

Sewage fluid flows through pipe 2 into the first chamber of the aerotank,

where it is mixed with activated sludge and air supplied through aerator 6. The silt mixture passes through the filter unit 11 and the opening 10 enters the second chamber, etc. From the last chamber, the purified water through the pipeline 3 is supplied to the destination.

The proposed solution excludes

return of sludge from the subsequent zone to the previous one and creates an increased individuality of biocenoses in the aerotank displacement chambers. The presence of filter loading before the gap between

zones provides controllability of the concentration of active sludge in each of the subsequent zones. The controllability of sludge concentration is achieved by the degree of periodic washing of the filtering

blocks.

The proposed solution is distinguished by simplicity and cost-effectiveness, the difference in simplification when implementing the invention on existing facilities is especially noticeable.

Claims (2)

1. Patent CUJA No. 3133017, cl. 210-5. 1959. 2. USSR author's certificate ff 558001, cl. C 02 C 1 / P2, 1975.