SK501232016U1 - Device for biological treatment of waste waters - Google Patents

Abstract

Disclosed is a biological wastewater treatment device consisting of a circulating activation purification tank (1) with activated biological sludge and an inlet (2) of contaminated waste water, a membrane filtration module (3) with a purified water outlet (4), an aeration device ( 6) and stirrers (7). An inner projection (5) is formed in the circulation activation cleaning tank (1).

Description

Technical field

The technical solution relates to a plant for biological treatment of waste water, i. j. Department of Chemistry and Metallurgy, namely treatment of industrial and municipal waters or sludge.

BACKGROUND OF THE INVENTION

Biological wastewater treatment plants use activated sludge, which is a mixture of different bacteria and microorganisms. Such sludge needs the nutrients contained in the waste water for its life, and the removal of these nutrients by the sludge will purify the waste water. The activation purification process is only possible if there is sufficient oxygen, which is solved by blowing air into the activation purification tank and membrane filter modules. At the same time, air is blown into the membrane modules to ensure water circulation and thus mechanical cleaning of the surface of the filter membranes.

The basic technological and construction objects of the existing biological waste water treatment plants are designed for pumping waste water, mechanical pre-treatment of polluted waste water, biological treatment with activated biological sludge in the activation tank, separation of sludge from treated water and outflow of purified water.

It is known to separate the biological sludge from the purified water in the form of sludge settling in the sedimentation tank or by filtering the purified water through the membrane or the water. membrane biological reactor. Systems with a membrane biological reactor have membrane filtration modules mounted either in the axis of the biological sludge tank, e.g. according to patents DE10051871 (A1), FR2954763 A1, CN102491589 A, CN101985374 A and JPH06182396 or are evenly mounted in the activation tank without more efficient recirculation of the biological sludge in the activation cleaning tank. Typically, membrane filter modules are flushed (vertically) by compressed air aeration, e.g. according to patents CN105776545 (A) and JPH07256284 A, or are mounted on the axis of a separate object outside the biological treatment tank, e.g. according to technical solutions and patents WO03064335A1, JPH08267095A, CN105731637A, CN203411441 U and CN202508915 U.

In most biological treatment systems, membrane modules are placed in a biological sludge tank. In small plants, the membrane module is loosely mounted in the tank, and in larger plants, a separate tank is set aside for the membrane modules so that, in the event of a breakdown, independent operations can be performed from the other part of the biological treatment. In such a so-called. By closing the inflow and outflow of the diaphragm tank, it is possible to make the necessary repairs after it is exhausted and it is not necessary to empty the entire biological treatment tank.

The main disadvantage of the devices described above is that it is necessary to recycle several times the amount of water / biological sludge mixture than the filtered amount of water between the biological treatment tank and the membrane tank. Also, the oxygen uptake from the air that is supplied to the membrane module is low, i. j. considerably lower than the oxygen input from the air that is supplied to the biological purification tank by means of special aeration elements.

The essence of the technical solution

The aforementioned drawbacks are largely eliminated by the biological waste water treatment plant according to the invention consisting of a circulating activated sludge treatment tank with activated biological sludge and a contaminated waste water inlet, a membrane filter module with a purified water outlet, an aeration device and a stirrer. The essence of the invention is that an internal protrusion is provided in the activated sludge activation tank with activated biological sludge and a contaminated waste water supply, wherein at least one agitator and at least one membrane filter module with a membrane filter module are installed between the activation purification tank and the inner protrusion. effluent.

It is advantageous here for the inner side of the circulation activation purification tank to be circular or oval or angular and on the outside the inner projection is circular or oval or angular.

It is further preferred that the membrane filter modules are mounted together.

It is also advantageous if the membrane filter modules are equipped with a separate aeration system.

At the same time, it is advantageous if the inner projection of the circulating activation purification tank is a denitrification tank with a contaminated waste water inlet and an outlet to the inlet of the circulating activation purification tank and at least one recirculation pump is mounted in the circulating activation purification tank.

It is likewise advantageous if an anaerobic and / or buffer tank of contaminated waste water is provided in the denitrification tank, through which the contaminated waste water flows into the denitrification tank.

The plant for biological waste water treatment according to the technical solution is technically simple with minimal costs of technological equipment and volume of construction costs. Compared to the prior art devices, it greatly increases the oxygen input from the air supplied to the membrane modules, thereby reducing the total power consumption of the entire wastewater treatment plant by at least 10 to 15% (depending on the type and design of the membrane modules). It also does not require recirculation pumps between the membrane filter module tank and the activation tank. The slowly used propeller stirrers used in the circulatory system have a significantly lower power consumption for the necessary recirculation and circulation of the activation mixture in the annulus. The device causes a prolonged contact of the air in the water and thus an increase in the oxygen input, i.e. j. reduction of electricity consumption even in aeration with the use of fine-bubble aeration elements.

BRIEF DESCRIPTION OF THE DRAWINGS

Specific examples of the construction of a biological wastewater treatment plant according to the invention are schematically shown in the accompanying drawings, where it is shown in FIG. 1 shows a plan view of a biological wastewater treatment plant having a circular circulating activation purification tank with an aeration device and a rectangular internal protrusion in the form of a partition, wherein an agitator is mounted behind the membrane filter module with a separate aeration system in the activation purification tank; 2 is a plan view of a biological wastewater treatment plant with a circular recirculation activation purification tank and a circular internal protrusion, in which a denitrification tank with a pair of recirculation pumps is formed into the recirculation activation purification tank, the aeration activation purification tank being fitted with with a separate aeration system stirrer, in FIG. 3 ground plan

-4 of the device of FIG. 2, which has an anaerobic tank in the denitrification tank, and FIG. 4 shows a plan view of the device of FIG. 3, which has a contaminated waste water buffer tank in the anaerobic tank.

EXAMPLES

An example of a biological wastewater treatment plant according to the invention is shown in the attached Figs. The apparatus consists of a circular recirculation activation purification tank 1 with activated biological sludge and a contaminated waste water inlet 2, a membrane filter module 3 with purified water outlet 4 and a stirrer 7, wherein an aeration apparatus 6 is located in the circular recirculation activation purification tank 1. At the same time, the membrane filter module 3 is equipped with a separate aeration system

11 which cleans and flushes it independently of the aeration device 6 in the circulation activation purification tank 1. Furthermore, a rectangular partition wall 5 is formed in the circular recirculation activation purification tank 1 with activated biological sludge and a contaminated waste water inlet 2.

The circular recirculation activation purification tank 1, which is normally filled with activated biological sludge, is fed with contaminated waste water through the inlet 2 and after its filling the agitator 7 and aeration device 6 are activated, thereby blending activated biological sludge and contaminated waste water between the inner protrusion 5. in the form of a partition and the inner edge of the circular circulating activation purification tank 1 rotates (circulates), aerates through the aeration devices 6 and at the same time penetrates through the filter module 3 By rotating (horizontal flow) the mixture of activated biological sludge and the polluted waste water above the aeration devices 6, the prolonged contact of the air bubbles with the water and thus the increased oxygen input d is achieved. o water, t. j. saving electricity for compressed air production. If necessary, excess biological sludge is withdrawn from the circular circulating activation purification tank 1 in a conventional manner by being pumped off by a pump (not shown) or by overpressure of the water column.

Another example of a biological waste water treatment plant according to the invention is shown in the attached Fig. 2. The plant consists of a circular circulation activation purification tank 1 with activated biological sludge and an inlet 2 of polluted waste water

5 of the diaphragm filter module 3 with the purified water outlet 4, wherein a circular internal activation purification tank with aeration devices 6 is fitted with a circular inner protrusion 5, in which a denitrification tank 8 is formed with an inlet 9 of contaminated waste water and an outlet, e.g. a wall or not shown opening in the wall of the circular inner protrusion 5 from the denitrification tank 8 to the inlet 2 of the circular activation purification tank 1, wherein a stirrer 7 is mounted downstream of the membrane filter module 3 with a separate purge and flushing membrane aeration system 11.

The contaminated waste water is fed through the inlet 9 to the circular denitrification tank 8, where it is denitrified in a conventional manner under constant stirring, and subsequently drains into the inlet 2 of the circular recirculation activating purification tank 1 in the circulating recirculation activating purification tank 1. 6, whereby the mixture between the circular inner protrusion 5 with the denitrification tank 8 and the inner edge of the circular recirculation activating purification tank 1 rotates (circulating) through the aeration means 6 and at the same time through the vacuum generated penetrates through the filter module 3 into the purified water outlet 4, the module 3 is provided with a separate aeration system 11 from below. By rotating (horizontal flow) the mixture of activated biological sludge and the polluted waste water above the aeration devices 6, the contact of the air bubbles with water and thus increased oxygen input into the water, i. j. saving electricity for compressed air production. If necessary, excess biological sludge is withdrawn from the circular recirculation activation purification tank 1 in a conventional manner by being pumped off by a pump (not shown) or by overpressure of the water column.

In FIG. 3 shows another embodiment of a biological waste water treatment plant according to the invention. In this embodiment, the device shown in FIG. 2, an anaerobic tank 12 is mounted in the denitrification tank 8, the inlet 9 of contaminated wastewater flowing into the anaerobic tank 12, where its conventional aerobic pre-treatment process consists of its own activation and separation of activated sludge which partially degrades the pollutants present and such still contaminated waste the water flows through the inlet 2 to the circular denitrification tank 8, where its purification process continues as described for the apparatus of FIG. Second

Further, in FIG. 4 shows another embodiment of a biological wastewater treatment plant according to the invention. In this embodiment, the device shown in FIG. 3 in the anaerobic tank 12, fitted with a buffer tank 13, wherein the inlet 9

6 of the untreated waste water flows into the buffer tank 13 where uniform homogenization occurs, i. j. equalizing the amount and quality of the contaminated wastewater flowing, wherein the contaminated wastewater from the buffer tank 13 flows through the inlet 2 into the anaerobic tank 12, where the purification biological process begins as described for the device of FIG. Third

The described and illustrated embodiments are not the only possible solutions according to the invention, since on the inside the circulation activating purification tank 1 may be oval or angular and / or on the outside the inner projection of the circulation activating purification tank 1 may be oval or angular. Two or more stirrers 7, two or more membrane filter modules 3 may be used in the apparatus, which may be separately or jointly mounted, only one recirculation pump 10 or more than two recirculation pumps 10 may be fitted between the denitrification tank 8 and the circulation activation purification tank 1. The agitator 7 may be mounted in any part of the circular activation purification tank 1, e.g. before or after and after the membrane filter module 3. The purge and flush aeration system 11 of the membrane filter modules 3 may form part of the aeration device 6 of the circulating activation purification tank 1. In the denitrification tank 8 a buffer tank 13 of contaminated waste water may be installed. the water flows into the denitrification tank 8.

Industrial usability

The wastewater treatment plant is designed for the treatment of polluted water from public sewerage, industrial and municipal wastewater, or sludge, in the form of industrial biological, physical and chemical separation of substances from various solutions capable of aerobic treatment with biological sludge. These include, in particular, municipal waste water, waste water from the food, chemical, textile, pharmaceutical, agricultural and other industries that produce biologically treatable waste water.

Claims (6)

1. A biological wastewater treatment plant comprising a recirculating activated sludge tank with activated biological sludge and a contaminated waste water inlet, a membrane filter module with purified water outlet, an aeration device and a stirrer, characterized in that in a recirculating activation sewage tank (1) ) with an activated biological sludge and an inlet (2) of contaminated waste water, an inner protrusion (5) is provided, wherein at least one agitator (7) is mounted between the activation purification tank (1) and the inner protrusion (5) in the recirculation activation purification tank (1). ) and at least one membrane filter module (3) with purified water outlet (4). The biological waste water treatment plant according to claim 1, characterized in that on the inside the recirculating activation purification tank (1) is circular or oval or square and on the outside the inner projection (5) is circular or oval or square. The biological waste water treatment plant according to claim 2, characterized in that the membrane filter modules (3) are fitted together. A biological waste water treatment plant according to claim 2, characterized in that the membrane filter modules (3) are provided with a separate aeration system (11). A biological waste water treatment plant according to claim 3 or 4, characterized in that the inner projection (5) of the recirculation activation purification tank (1) is a denitrification tank (8) with an inlet (9) of contaminated waste water and an outlet to a supply (2) of the circulating activation purification tank (1), wherein at least one recirculation pump (10) is fitted between the circulating activation purification tank (1) and the denitrification tank (8) in the circulating activation purification tank (1). A biological waste water treatment plant according to claim 5, characterized in that an anaerobic tank (12) and / or a buffer tank (13) of contaminated waste water through which the contaminated waste water flows through the denitrification tank (8). into the denitrification tank (8).