CS223383B1 - Device for biological cleaning of refuse waters of the aerobe activation with fluidic separation of activated smudge - Google Patents

Abstract

A plant is described for the biological clarification of waste waters by biological activation with fluid separation of the activated sludge, in which, in a common activation chamber having a common aeration system, a series of separation chambers for fluid filtration is provided by means of a plurality of partition walls. The plant is characterised by its technically simple design and also by its comparatively low space requirement. <IMAGE>

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plant for biological treatment of wastewater by aerobic activation with fluid filtration of activated sludge.

The device is designed for biological waste water treatment, especially for larger and large capacities and also for intensification of existing water treatment plants.

Biological treatment of wastewater typically involves aerobic biological activation, separation of activated sludge, and returning a portion of the separated activated sludge back to activation. Devices operating in this manner employ a separate activation and separation system; the separation is carried out by sedimentation and the return of activated sludge is effected by pumping. The general disadvantages of these devices are the large area and volume of special sedimentation tanks and the resulting considerable purchase costs, demanding machinery and complicated interconnection, which is unfavorably reflected in the resulting investment costs and built-up area requirements.

In small and medium-sized waste water treatment plants, these devices are replaced by newer devices where the activated sludge is separated by fluid filtration and the activated sludge is returned to the activation by gravity. These newer devices eliminate many of the disadvantages of the former, already of the classical type.

These newer devices achieve greater efficiency compared to conventional sized devices by automatically gravitationally returning activated sludge to significantly simplify plant interconnection and to achieve higher activated sludge concentration and thus higher output per unit volume of activation, and to allow space above activation to separation and thus more effectively reduce both the built-up area and the volume of equipment.

The disadvantage of known devices of this newer type, however, is their limitation in the size of their arrangement and construction. If more capacity is needed, it is necessary to use more separate devices of this type next to each other. At the same time, the pursuit of savings by using common parts for a number of separate units encounters considerable difficulties. This is particularly noticeable in the aeration system, where the use of a common aeration system in a plurality of devices leads to hydrodynamic instability and thus to a malfunction. The disadvantage of simply aggregating multiple discrete units with increasing the plant capacity outweighs the advantages of these plants, leading to the fact that large wastewater treatment plants are built up to the previously mentioned conventional plants, despite the known disadvantages of the described newer solution.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a plant for biological wastewater treatment by aerobic activation with fluidized bed separation of activated sludge, which is particularly advantageous for larger and large capacities or for intensifying existing wastewater treatment plants.

The essence of the device according to the invention is that in a free-flow tank comprising a common aerobic activation space with a uniform aeration system, several dividing walls extending above the free level are provided, forming separation spaces for fluid filtration, in each of these separation separators. In the upper part of the space, a discharge of purified water is arranged in its upper part, while its lower part forms a passage for the activation mixture inlet.

Another feature is that underneath each partition wall there is a lower partition wall which, together with the lower part of the partition wall, forms a rectifying channel having an inlet opening in its upper part into the activation space formed by openings and passing into the cylindrical sleeve forming the outlet opening. into an activation space extending into the lower part of the activation space, above which a bubble trap is arranged, the lower edge of which extends in vertical view through the passage.

Another feature is that the shell of the tank extends beyond the upper edges of the partition walls and creates a foam space above the free surface, wherein the partition walls are provided with foam-proof covers above the free surface.

An embodiment in which the tank has the shape of a vertical cylinder is easy to manufacture and simple.

It is also advantageous - especially for the modernization of existing treatment plants - that the tank is rectangular in vertical view and the dividing walls are arranged in several rows therein, along each row there are inclined baffle walls in the activation space to divert the upward flow of liquid with air and longitudinal flow in the activation space.

An exemplary embodiment of the invention is shown schematically in the drawings, wherein Fig. 1 represents the device in vertical axial section and Fig. 2 shows the same device in plan view.

The apparatus consists of one cylindrical tank with a vertical axis, formed by a shell 1 and a bottom 21, in which four separation spaces 2 are located. Each of these separation spaces is formed by a partition wall 3 which defines it with its funnel-shaped upwardly extending shape. of these separation spaces in its lower open part communicates with the common activation space 4 through the passage 5.

Underneath the partition wall 3 is a funnel-shaped lower partition 6, provided with apertures 17 at its upper part and passing into a cylindrical sleeve 7 at its lower part. In each of the separation spaces 2 an upwardly tapered funnel-shaped bubble trap 8 communicating with the free Each se223383 steaming space is provided at this level with a collecting trough 10.

The discharges 11 of the purified water from the individual collecting troughs 10 are led to the center of the tank and then through a common drain 12 to the waste.

A raw water inlet 13 opens into the tank activation space 4. The activation space 4 is provided with a uniform aeration pneumatic system consisting of a known source of compressed air (not shown), a manifold 14 connected thereto and aeration elements 15. The arrangement of the aeration elements 15 is concentric with respect to the axis of each of the separation spaces 2. equipped with an outlet 16.

The described device operates as follows. The raw water flows into the activation space 4 via the inlet 13. The activation space 4 is, as already mentioned, uniform for the whole plant and is aerated also by the described uniform aeration system by which the oxygen necessary for the life of activated sludge microorganisms is supplied. At the same time as the oxygen supply, the aeration keeps the activation mixture floating. A single aeration system makes it possible to use a single source of compressed air.

The activation mixture enters the separation space 2 each independently, and the openings 17 in the bottom partition wall 6. In the separation space are separated activated sludge from the purified _ liquid which is in the ^H ORM ^CA STI. ^hp separator separators ^{from the} collecting trough 10.

The separated thickened activated sludge automatically gravitationally passes through the passages 5 and returns via cylindrical sockets 7 to the activation space 4. Excess activated sludge is periodically withdrawn when the aeration of the outlets 16 is stopped.

The device according to the invention is not limited to the described positive devices. The disappearance may comprise a different number of separation spaces. For circular containers is especially preferred number 3, ^7, 19. The device is not however limited to use of the circular shape of the tank, but equally well suited pravoiihl ^ ^p opffpa jrné ^de i ^t vary tanks. For example, the installation of the described separation spaces in existing rectangular activation tanks of conventional biological water treatment plants makes it easy to intensify the purification process. It is preferred to design the tanks in a rectangular shape in which tolita sten ^{y 3} m ^s s ^I n ^y NEKOLA ^{IK of AD ch p} ri ^No. em ^{f P} ro dosažern žádourího odktonění upward flow of the liquid with air to create longitudinal flow In the activation space 4, inclined baffle walls are arranged along each row of partition walls 3 in the activation space 4.

It is also preferred that the tank shell 1 extends significantly beyond the upper edges of the partition walls 3 and thus creates a foam space above the free surface, wherein the partition walls 3 are provided with suitable foam protection covers above the free surface.

The device according to the invention has numerous advantages. Compared to the use of a series of separate newer devices of the same overall capacity, the device according to the invention brings substantial savings by using a single tank instead of a series of tanks, which requires considerably less material and labor to build. air, that interconnection is considerably simpler than many devices, and that thermal insulation is easier. Compared to a conventional plant with the same performance, it provides significantly greater performance per unit of surface and volume, resulting in savings in construction site and investment.

Another advantage of the device according to the invention is the great flexibility of the device, whereby devices of different capacities and tanks of different shapes can be constructed with the same modular elements. This, among other things, gives the possibility to integrate already built-up classic sewage treatment plants by inserting suitable built-in into existing tanks. The use of unified modular elements - internal funnels - enables the machine mass production of these elements and thus their substantial reduction. _______________

Claims (5)

OBJECT OF THE INVENTION Apparatus for the biological treatment of wastewater by aerobic activation with fluidized bed separation of activated sludge, characterized in that in a free surface tank containing a common aerobic activation space (4) with a uniform aeration system, several dividing walls (3) extending above the free surface and creating a separation space (2) for fluidized bed filtration, while in Preach ^dé MZ ^I c ^HT separačrnch chambers ⁽²⁾ is in its upper portion disposed outlet [11] of purified water, while the bottom part forms a passage (5) for the activation mixture input. 2. Device according to claim 1, characterized in that the clip ^moves ka ou tóhcí wall ⁽²⁾ of the lower partition wall [6], together forming the bottom portion of the dividing wall baffle duct, which has in its upper part the inlet opens into the activation space (4) formed by openings (17) and in its lower portion merges into a cylindrical sleeve (7) forming the outlet opens into the activation space, led out into sjpodrn ^C with ^a ^ ^{i 2} aMívacnňho space (4 ^ pnčemž over passage (5) is arranged trap the bubbles ^and not ^to (8h whose ^d s ^p on the periphery ^{of p} RESA ^h U is viewed in vertical passage (5). 3. Apparatus according to claim 1, characterized in that ^PL AST ⁽¹⁾ tank ^from an ^instance aces ^h U is ^H orm edges of the separating walls (3) to form the free space hla2233B3 DINA foam, wherein the dividing wall (3) is above the free surface fitted with foam protection covers. 4. Device according to claim 1, characterized in that the tank has the shape of a vertical cylinder. Device according to claim 1, characterized in that the tank has a rectangular shape in a vertical view and the dividing walls (3) are arranged in several rows therein, along each row there are inclined deflection walls for diverting in the activation space (4). an upward flow of liquid with air and generating a longitudinal flow in the activation space (4).