BG2975U1 - Plant for biological purification of waste waters - Google Patents

Abstract

The technical solution of the utility model relates to a plant for purification of waste waters, which consists of a reservoir for circulationally activated purification (1) with activated biological sludge and input inflow (2) of polluted waste waters from a membrane filtrating module (3) with discharge (4) of purified water, air intake unit (6) and a stirrer (7). In the inside reservoir for circulationally activated purification (1) with activated biological sludge and input inflow (2) of polluted waste waters is created an internal bulge (5), as from the internal side of the reservoir for activated purification (1) and internal bulge (5) inside the reservoir for circulationally activated purification (1) is mounted at least one stirrer (7) and at least one membrane filtrating module (3) with discharge (4) of purified water.

Description

Field of technology

The utility model refers to a biological wastewater treatment plant that is used for the treatment of industrial and urban water and sludge.

BACKGROUND OF THE INVENTION

Biological wastewater treatment plants are known that use activated sludge for treatment, which is a mixture of various bacteria and microorganisms. Such sludge requires for its existence nutrients contained in the wastewater, and by removing these nutrients with the help of sludge wastewater is treated. The process of activated purification is possible only with a sufficient amount of oxygen, which is solved by introducing air into the activating purification tank and membrane filter modules. The introduction of air into the membrane modules at the same time ensures the circulation of water and thus becomes a mechanical cleaning of the surface of the filter membranes.

The main technological and construction sites of the existing stations for biological wastewater treatment are designed for pumping wastewater, mechanical pre-treatment of contaminated wastewater, biological treatment with activated biological sludge in the activating tank, separation of sludge from the treated water and drainage. water.

It is known to separate biological sludge from purified water in the form of collecting sludge in a sedimentation tank or filtering the purified water through a membrane, resp. membrane biological reactor. Membrane biological reactor systems have membrane filtration modules mounted either in the axis of the biological sludge tank, e.g. according to patents DE 10051871 (Al), FR 2954763 A1, CN 102491589 A, CN 101985374 A and JPH 06182396, or are evenly mounted in the activating tank without more efficient recirculation of the biological sludge in the activating purification tank.

Typically, membrane filter modules are flushed (vertically) by aeration with compressed air, e.g. according to patents CN 105776545 (A) and JPH 07256284 A, or are mounted in the axis of a separate object outside the biological treatment tank, e.g. according to technical solutions and patents WO 03064335 A1, JPH 08267095A, CN 105731637A, CN 203411441 U and CN 202508915 U.

In most membrane biological treatment systems, membrane modules are introduced into the biological sludge tank. In small treatment plants, the membrane module is freely integrated in the tank, and in larger treatment plants for membrane modules, a separate tank is separated to perform independent operations from the rest of the biological treatment in case of failure. In such a so-called "membrane tank", after closing the water flow and its drainage, the necessary repairs can be performed, and it is not required to empty the entire biological treatment tank.

The main disadvantage of the devices described above is that several times more water and biological sludge mixture has to be recycled than the filtered amount of water between the biological treatment tank and the membrane tank. Also, the introduction of oxygen from the air supplied to the membrane module is low, which means significantly lower than the introduction of oxygen from the air supplied to the biological treatment tank by means of special aeration elements.

Technical essence of the utility model

The described disadvantages are eliminated by the biological wastewater treatment plant according to the invention, consisting of a tank for circulating activated treatment with activated biological sludge and external inflow of polluted wastewater, by a membrane filtration module with treated water outlet, and by an aerator device. stirrer. In the tank for circulating activated treatment with activated biological sludge and external inflow of polluted wastewater, an internal protrusion is created, as between the inner wall of the tank

2622 Descriptions to certificates for registration of utility models № 08.2 / 31.08.2018 for circulating activated purification and internal outlet, in the tank for circulating activated purification is installed at least one stirrer and at least one membrane filter module with purified water outflow.

Preferably, the circulating activated purification tank has a circular, oval or rectangular shape on the inside and the inner protrusion has a circular or oval or rectangular shape on the outside.

It is also preferred if the membrane filter modules are mounted together in one device / device.

In another preferred embodiment, the membrane filter modules are provided with a separate aeration system.

It is also useful if the inner protrusion of the circulating activated treatment tank is designed as a denitrification tank with an internal inflow of contaminated wastewater and an outlet to the external inflow of polluted wastewater of the circulating activated treatment tank, as between the reservoir and activated cistern. the denitrification tank located in the circulating activated purification tank has at least one recirculation pump installed.

It is also advantageous if at least one anaerobic and / or equalization tank for contaminated wastewater is installed in the denitrification tank, through which the contaminated wastewater flows into the denitrification tank.

The facility for biological treatment of wastewater, according to the utility model, is technically simplified, with minimal costs for technological equipment and for its construction. Compared to the facilities described in the prior art, the penetration of oxygen from the air supplied to the membrane modules is significantly improved, which significantly reduces the total electricity consumption in the entire wastewater treatment plant by at least 10 to 15% (depending on the type and the design of the membrane modules). It also does not require recirculation pumps between the membrane filter module tank and the activation tank. The propeller stirrers already used in the circulation system, which are already conventionally used, have a significantly lower consumption of electricity for the necessary recirculation and circulation of the activating mixture in the intermediate ring. The device provides prolongation of the air contact in the water and thus increases the oxygen supply, this further reduces the consumption of electricity and when aerating using aerating elements with fine bubbles.

Explanation of the attached figures

Specific examples of the construction of the biological wastewater treatment plant, according to the utility model, are shown in the attached figures, where:

Figure 1 shows a top plan view of a biological wastewater treatment plant having a circular tank for circulating activated treatment with an aeration device and a rectangular internal outlet in the form of a barrier, with a stirrer mounted in the activated treatment tank. the membrane filter module with independent aeration system;

Figure 2 is a top plan view of a biological wastewater treatment plant with a circular tank for circulating activated treatment and a circular internal outlet, which is designed as a denitrification tank with a pair of recirculation pumps in a circulating activated treatment plant in a circulating activated treatment plant. aeration mechanism and behind the membrane filter module with a separate aeration system there is a stirrer;

in figure 3 - top view of a horizontal projection of the device of fig. 2, which has an anaerobic tank mounted in the denitrification tank;

in figure 4 - top view of a horizontal projection of the device of fig. 3, which has an equalization tank for polluted wastewater installed in the anaerobic tank.

2623 Descriptions to certificates for registration of utility models № 08.2 / 31.08.2018

Examples of implementation of the utility model

An exemplary embodiment of the biological wastewater treatment plant according to the utility model is shown in the attached fig. 1. The facility consists of a circular tank for circulating activated treatment 1 with activated biological sludge and an external inlet 2 of contaminated wastewater, a membrane filter module 3 with a discharge 4 of purified water and a stirrer 7. In the circular tank for activated circulation 1 An aeration device 6 is mounted. At the same time, the membrane filter module 3 is equipped with a separate aeration system 11, which independently of the aeration device 6 in the circulation activated activation tank 1 further cleans and washes it. In addition, in the circular tank for circulating activated treatment 1 with activated biological sludge and inlet inflow 2 of contaminated wastewater, there is created a rectangular inner protrusion 5 in the form of a barrier.

The operation of the facility is as follows.

In the circular tank for circulating activated treatment 1, filled in a conventional way with activated biological sludge, polluted wastewater is supplied with the external inlet 2 and after the tank is full, the stirrer 7 and the aerating devices 6 are turned on. sludge and contaminated wastewater rotates (circulates) between the inner outlet in the form of a barrier 5 and the inner wall of the circular tank for circulating activated treatment 1, with the aerating devices 6 is aerated and at the same time with the created pressure passes through the filter module 3 to the outlet 4 of purified water, which is also provided below with a separate purification and washing membrane aeration system 11. By rotating (horizontal flow) of the mixture of activated biological sludge and contaminated wastewater over the aeration devices 6, prolongation of the contact of air bubbles with water and thus also increased intake and oxygen in the water, which means saving electricity to produce compressed air. If necessary, in a conventional manner, the excess biological sludge is removed from the circular tank for circulating activated treatment 1 by pumping with a pump, which is not shown, or is discharged by overpressure of the water column.

Another example of the biological wastewater treatment plant according to the utility model is shown in the attached fig. 2. The facility consists of a circular tank for circulating activated treatment 1 with activated biological sludge and an inlet 2 of polluted wastewater, of a membrane filtration module 3 with a discharge 4 of purified water, here in the circular tank for circulating 1 with activated aeration devices 6 the inner protrusion 5 is made as a circular denitrification tank 8 with an internal inflow 9 of contaminated wastewater and through an outlet - outflow for drainage, for example in the form of a fall through a wall or an unshown hole in the wall of the inner protrusion 5 - circular denitrification tank 8 - is passed as an inlet 2 of the circular tank for circulating activated purification 1. Behind the membrane filter module 3 with a separate purification and flushing membrane aeration system lie drain 4 for effluent for purified water there is a stirrer 7.

In this embodiment, the contaminated wastewater is delivered via the internal inlet 9 to the circular denitrification tank 8, where it is denitrified in a conventional manner with constant stirring and then discharged as an inlet 2 into the circular tank for circulating activated treatment 1. In the circular reservoir. activated purification 1 activates the stirrer 7 and the aerating devices 6, as the mixture between the inner protrusion 5 as a circular denitrification tank 8 and the inner wall of the circular reservoir for circulating activated purification 1 rotates (circulates) through the aerating devices 6 is aerated and at the same time creating passes through the filter module 3 to the effluent 4 of treated water, the filter module 3 below is equipped with a separate aeration system 11. With the rotation (horizontal flow) of the mixture of activated biological sludge and contaminated wastewater over the aeration devices 6 The pan prolongs the contact of air bubbles with water and thus also increases the intake of oxygen in the water, this

2624 Descriptions to utility registration certificates № 08.2 / 31.08.2018 provides electricity savings for compressed air production. If necessary, in a conventional manner, the excess biological sludge is removed from the circular tank for circulating activated treatment 1 by pumping with a pump, which is not shown, or is discharged by overpressure of the water column.

In FIG. 3 shows another example of an embodiment of a biological wastewater treatment plant according to a utility model. In this embodiment, the device shown in FIG. 3 has an anaerobic tank 12 installed in the denitrification tank 8, as the internal inflow 9 of polluted wastewater flows into the anaerobic tank 12, where a normal process of their pre-aerobic treatment takes place, consisting in self-activation and separation of the activated sludge, which partially decomposes the contaminants present and such still contaminated waste water pass through the outlet or by decay as an inlet 2 into the circular denitrification tank 8, where the purification process continues as described in the device of FIG. 2.

In FIG. 4 shows another example of an embodiment of a biological wastewater treatment plant according to a utility model. In this embodiment, the device shown in FIG. 4 has a balancing tank 13 installed in the anaerobic tank 12, the internal inflow 9 of polluted wastewater flows into this balancing tank 13, where uniform homogenization takes place, ie equalization of the quantity and quality of the flow of polluted wastewater, which is usually the first degree of the mechanical part of the wastewater treatment plants. Such contaminated wastewater from the balancing tank 13 as an inlet 2 flows into the aerobic tank 12, where the process of their treatment continues, and the biological treatment begins as described for the facility of FIG. 3.

The described and depicted technical solutions are not the only possible embodiments according to the utility model, as the circulating activated purification tank 1 on its inner side can be oval or rectangular, and the inner protrusion 5 of the circulating activated purification tank 1 on its outer side can be oval or rectangular. be oval or rectangular.

Two or more stirrers 7, two or more membrane filter modules 3 can be used in the device, which can be mounted separately or together in one device; only one recirculation pump 10 or more than two recirculation pumps 10 can be mounted between the denitrification tank 8 and the circulating activated purification tank 1. The stirrer 7 can be mounted in any part of the circular circulating activated purification tank 1, e.g. . in front of or in front of and behind the membrane filter module 3. The purification and flushing aeration system 11 of the membrane filter modules 3 may be part of the aeration device 6 of the circulating activated purification tank 1. In the denitrification tank 8 a compensating tank 13 can be installed. waste water through which the polluted waste water passes and flows into the denitrification tank 8.

Industrial usability

The wastewater treatment plant is intended for the treatment of polluted water from public sewers, industrial and municipal wastewater or sludge, in the form of industrial biological, physical and chemical separation of substances from various solutions that are capable of aerobic treatment with biological sludge. . These are mainly municipal wastewater, wastewater from the food, chemical, textile, pharmaceutical industries, agriculture and other industries that produce biodegradable wastewater.

Claims (6)

Claims A biological waste water treatment plant consisting of a tank for circulating activated treatment with activated biological sludge and an inflow of contaminated waste water, a membrane filtration module with a waste water outlet, an aeration device and a stirrer, characterized in that that an internal outlet (5) is created in the tank for circulating activated treatment (1) with activated biological sludge and inlet inflow (2) of polluted wastewater, 2625 Descriptions to utility registration certificates № 08.2 / 31.08.2018 as between the inner wall of the activated purification tank (1) and the inner outlet (5), at least one stirrer is installed in the circulating activated purification tank (1) ) and at least one membrane filter module (3) with a drain (4) of purified water. Biological wastewater treatment plant according to Claim 1, characterized in that the circulating activated treatment tank (1) is circular or oval or rectangular on the inside and the inner protrusion (5) on the outside is circular or oval or rectangular. Biological wastewater treatment plant according to claims 1 and 2, characterized in that the membrane filter modules (3) are mounted together in one device. Biological wastewater treatment plant according to claims 1 and 2, characterized in that the membrane filter modules (3) are equipped with a separate aeration system (11). Biological wastewater treatment plant according to claims 1, 2, 3 and 4, characterized in that the inner protrusion (5) of the circulating activated treatment tank (1) is designed as an internal inflow denitrification tank (8). (9) of contaminated wastewater and outlet to the inlet (2) of contaminated wastewater of the circulating activated treatment tank (1), as between the circulating activated treatment tank (1) and the denitrification tank (8) in the circulating activated water tank. purification (1) has at least one recirculation pump (10) installed. Biological wastewater treatment plant according to the preceding claims 1 to 5, characterized in that an anaerobic (12) and / or equalization tank (13) for contaminated wastewater is installed in the denitrification tank (8), through which contaminated wastewater flows into the denitrification tank (8).