CZ2017325A3 - An aeration jet pump, especially for biological wastewater treatment plants - Google Patents

Abstract

The aeration nozzle pump is particularly intended for pumping liquids from sewage treatment tanks and is formed by a vertically disposed pumped fluid flow pipe (1) which is terminated at the top by one or two outlet necks (11). The essence of the invention is that the pump comprises at least one ejector body (2) in whose inner cavity a suction chamber (21) of pumped fluid is formed whose flow cross-section is larger than the flow cross section of the flow tube (1) and an annular feed chamber (22) having at least one pressure medium inlet opening (23) on its outer surface. The bottom (221) of the feed chamber (22) is blinded and in the upper portion the feed chamber (22) is provided with a baffle nozzle (24) resulting in a conical outlet section (25) of the ejector body (2), whose outlet cross section substantially corresponds to the flow cross section. tubes (1). The inlet openings (23) in the case of multiple formation are arranged in substantially one horizontal plane.

Description

Aeration jet pump, especially for biological wastewater treatment plants

Field of technology

The invention relates to the construction of an aeration jet pump intended for use in installations where it is necessary to ensure the transfer of fluid between two tanks or between different spaces of the same tank, such as biological wastewater treatment plants. This device can be switched by means of either a mechanical or an electric, for example a solenoid, air valve.

Prior art

Currently, mammoth pumps are used in biological wastewater treatment plants, the suction nozzle of which is located at the bottom of the tank or elsewhere below the surface. Due to the back-discharge forces of the air supplied to the mammoth pump, for example during sludge activation or during the initial pumping phase, dirty water is sucked in, which affects and degrades the resulting effect of the cleaning process. In some industries, ejectors are used as water pumps to transfer fluid by means of compressed air, which is fed by nozzles into the fluid chamber and entrained into the horizontal pipe. None of the known solutions used alone is good enough and optimally usable for:

- fast and efficient transfer of fluid from one tank to another, where the fluid is saturated with gas during the transfer;

- rapid transfer of fluid from one part of the tank to another or from several parts of the tank to one part or from one part of the tank to several parts of the same tank;

- non-swirling fluid transfer without mixing the fluid layers at the inlet of the device.

/ As an example of the above devices, we can mention the solution according to the document CN202914413kU) - "Multifunctional ejector", which is purely multifunctional

-2ejector, which stops the ejector effect, and thus the whole pump, when the chamber is partially clogged, when the flow rate of the fluid at the outlet of the material decreases to the inlet velocity or is even lower. The regulation of the material supply is solved mechanically by means of a ball valve, which is to regulate the amount of gas and thus of the fluid, for example a mixture of air and water, which enters the device, which is not optimal. The discharge tube then widens towards the material outlet tube, which is not optimal in terms of efficiency. Solution according to document C (U) “Steam-jet ejector water pump refers to an ejector that works as a steam atomizer. Again, an extended bilge tube is used in the construction, which in this case slows down the steam escaping from the device. File No. 0224665 ^ U) - "Gas and liquid mixing ejector of airlift type aerobic fermentation tank" is an ejector device of aeration type, which serves to saturate the fermentation tank with oxygen through an extended outlet pipe. It is therefore an aerator low energy consumption. The design of the aeration pump according to RuJs9707 ^ C1) - „Airlift aims to prevent the return of insoluble substances contained in the water mixture to the air duct. To ensure this function, it is necessary to supply a volume of air comparable to the volume of water, aeration is addressed in the WC> ž file is disadvantageous. Application of the aeration effect for the used method of spraying the mixture in (079 | A1) - „Airlift oxygenating system, where there are bioreactors. CN ^ 0415072 (^ A) - Airlift type integrated sewage treatment device solves a complex wastewater treatment plant, where an anoxide tank, an aerobic tank and a sedimentation tank are an integral part, between which aeration pumps are used to move the water. In the device described in W <

Al) - „Water piping system having water hammer buffering function using ejector effect and pressure tank connector therefor is solved by reducing water pressure on the valve by ejector effect, which is very complicated and usable only for special cases. KRn01712061uB1) Water sludge recovery ejector a CN

1 (A) - „Jet action valve of high only with its own ejector solution solves only its own special construction of ejectors, with /

CN 205253393 (U) - „Hydraulic ejector with adjustable filter construction of hydraulic 'N'] f k / special construction of ejectors, ejector file and file J

Í (A) - „Ejector and multiple-effect fresh water generator solves a complex device, the components of which is an ejector, which ends

-3Horizontal tube with a larger diameter, which is not optimal. Furthermore, for example, the construction of an ejector is known according to CN205225228 (U) - "Ejector and oil machinery *", which describes equipment for use in the petroleum industry, where the ejector is equipped with ............... .... Λ ......... sensors and adjustable nozzles that affect the amount of traps that enter the piping. CN205684208 (U) - "High-efficient nozzle suitable for wafer jet air ejector" then describes an ejector nozzle for use in rivers and CN105089607 (A) - "Underground self-operated ejector water discharge and gas produetfon tool" ejector for use in the gas industry. Device according to KRn 01332684 (B1) - „Membrane water treatment device having air ejector solves water purification by means of membrane and file TW200502181 (A) -„ Ejector for aeration “construction of ejector for water aeration, where it is a submersible device without liquid transfer to another place. Another type of ejector is known from KR2OO0O326O2 (A) "The method that drying sludge of the type of Ventury ejector using the difference between air current and athmospheric pressure" dealing with the method of dewatering excess sludge, namely by spraying and storing it in a comminuted form. . Υφθθ · ^ ί 66171 (A1) - "Geyserpump" describes a classic aeration pump - without the use of an overpressure ejector part and in

documents C ^ l 'mammoth power generator solves a complex

0479 (U1) construction of various types of classic "Aerator outfitted with a hydraulic construction of tanks and duct network, where the ejector and mammoth pump are not combined into one device, but work in separate areas of the system, and file CM 01284698 (A) -" Method and device of jet airlift recirculated membrane bioreactor uses a jet mammoth mixing module, into which the water pump supplies water and where air is mixed with water, which is transported together with the water to the merber membrane bioreactor and performs the function of flushing the membrane. In CA2583752 (A1) - "The intergrated multi-zone wastewater treatment system and method" is a mammoth pump consisting of an entire aerobic zone, and is essentially a tank with a filter and bottom aeration, rather than an aeration pump. There is no ejector part for the supply of compressed air when the air is supplied via the A / zd ear diffuser. Other mammoth pumps are known, for example, from G02403217 (A) - "Waste

-4treatmenLsystem ", RII2209779 (01) -" Unit for deep purification of sewage water "or E.

606 (A1) - "Process for biological treatment of domestic and industrial wastewater and a plan therefor". The construction of a mammoth pump for pumping active sludge back to an anaerobic reactor is known from document RU2220919 (C1) - "Installation for fine biological purification of sewpge and a mammoth pump intended for recirculation of active sludge from file RU2209779 .......,, .. ........ ft ,, (01) - „Unit for deep purification ^ / sewage watef. The use of a conventional air diffuser is known from WQ02096806 (A2) - "Method, apparatus and biomass support element for biological wastewater treatment", a mammoth pump whose task is to pump water from one tank to another and also to oxidize water during such pumping from the file. Wq8102661 (A1) - "Mariculture filtering system and mammoth pump" for directing the discharged air into a rotary cylindrical tank of the document RU2113415 (01) - "Device for biological purification of sewage. Me AU £ 01000091 (A1) - "Membrane cleaning with a pulsed airlift pump is then solved by cleaning the membranes of the device by means of a mammoth pump and a pulsating air supply.

It is an object of the present invention to provide a new design of an aeration jet pump, intended in particular for incorporation in biological wastewater treatment plants, which would be structurally simple and functionally interconnected known fluid pumping technologies using a mammoth pump and an ejector mechanism to expel a fluid mixture, such as water, using compressed gas. , preferably air.

The essence of the invention

The object is largely achieved by the invention, which is an aeration jet pump intended in particular for pumping liquids from wastewater treatment plant tanks and consisting of a vertically arranged flow pipe of the pumped liquid, which is terminated in the upper part by one or two

-5 outlets, the essence of the invention consists in that the pump comprises at least one ejector body, in the inner cavity of which a suction chamber of the pumped fluid is formed, the flow cross-section of which is larger than the flow cross-section of the flow tube and the circumferential supply chamber. which is provided on its outer surface with at least one pressure medium supply opening, the bottom of the supply chamber being blinded and in the upper part the supply chamber provided with a baffle nozzle opening into a conical outlet section of the ejector body whose outlet cross-section substantially corresponds to the inlet cross-section of the flow tube. the supply openings (23) are arranged essentially in one horizontal plane in the case of multiple V 'formation.

In a preferred embodiment, the supply openings are guided from the supply chamber outside the ejector body in a radial or tangential direction and the ejector body is attached to the inlet neck of the flow tube or is built into the middle part of the flow tube.

Finally, it is advantageous if the pump comprises two or more built-in ejector bodies, located either at the inlet and in the middle part of the flow pipe or at the inlet and at the outlet of the flow pipe.

The invention achieves a new and higher effect in that the device has a universal use both for moving the fluid as a pump and for saturating the fluid with gas as an aeration device, without normal feedback on the pumped liquid, so that no sediment swirls, for example in a sedimentation tank during biological wastewater treatment. The device is light, portable and requires only simple maintenance, namely flushing the ejector part with water, while having a simple control when it can be switched by means of either a mechanical or an electric, for example solenoid, air valve, so that power control can be automatic or mechanical. Another advantage of the design of the device is that when the chamber is clogged, only the ejector effect is reduced or completely stopped, but the device continues to operate as an aeration pump. A significant benefit is the increase in flow rate

-6 transported fluids, which increases the efficiency of the device and its performance, when it is possible to transport the fluid to a greater height than with conventional mammoth pumps.

ÍDopis-obrázky-na pnaojaaýeHvýkreseehi

Specific embodiments of the invention are schematically illustrated in the accompanying drawings, in which Fig. 1 is a longitudinal axial section of a basic embodiment of a pump comprising one ejector body attached to a flow pipe inlet and provided with one aeration medium inlet; of Fig. 1, Figs _; 2b) to FIG. D) are cross-sections BB of exemplary alternative embodiments of an ejector body with two or three radial inlet openings and three tangential aeration medium inlet openings. Fig. 4 is a longitudinal section of an alternative embodiment of a pump with two ejector bodies built in at the inlet and in the vertical part of the flow pipe; 6d) schematically show alternative embodiments of the pump of FIG. 1 comprising two flow pipe outlets opening downwards or one or two nozzles opening horizontally or one nozzle opening upwards for the solution of an ejector body with one aeration medium supply opening and FIG. for one neck leading upwards for the river ejector body with two supply openings for aeration medium, Fig. 7a) to Fig. 7k) are schematically shown alternative embodiments

Fig. 3 is a schematic illustration of an alternative embodiment of the pump of Fig. 4, comprising two outlet nozzles of the flow tube opening downwards, and Fig. 9 is a schematically shown alternative embodiment of the pump. of Fig. 1e, comprising two outlet nozzles of a flow tube opening downwards.

The drawings, which illustrate the present invention and the examples of specific embodiments described below, in no way limit the scope of protection given in the definition, but merely clarify the essence of the invention.

Examples of embodiments of the invention

In the basic embodiment shown in FIG. 1, the aeration nozzle pump is formed by a vertically arranged flow pipe 1, which is terminated in the upper part by an outlet neck 11 in the form of a knee situated downwards and to its inlet neck 12 a hollow ejector body 2 of preferably cylindrical cross-section. A cylindrical suction chamber 21 of the pumped fluid is formed in the inner cavity of the ejector body 2, the flow cross-section of which is larger than the flow cross-section of the flow tube 1. An annular supply chamber 22 is formed around the suction chamber 21, which is provided with a pressure inlet 23 on its outer surface. medium, for example air, situated in a radial direction outside the ejector body 2. The bottom 221 of the supply chamber 22 is blinded and provided in the upper part with a baffle nozzle 24 opening into a conical outlet section 25, the outlet cross-section corresponding to the inlet cross-section of the flow tube 1. 2b and 2c, the supply chamber 22 need not be provided with only one radial inlet opening 23, but with two, three or more inlet openings 23 spaced regularly around the circumference of the supply chamber 22, or the inlet openings 23 may be situated tangentially as shown in FIG. 2d.

During operation of the pump, the pumped fluid is supplied to the suction chamber 21, the pressure medium being conveyed from a source (not shown) through a supply opening 23 to the supply chamber 22, from which it flows through a baffle nozzle 24 into the outlet section 25 of the ejector body 2. which flows through the flow pipe 1 to the outlet 11. The flow rate of the mixture can then be influenced by regulating the pressure of the medium conveyed to the supply chamber 22 or by structurally changing the flow cross-section of the baffle nozzle 24.

The described construction is not the only possible solution of the aeration jet pump, but as follows from Fig. 3, the ejector body 2 does not have to be located on the inlet 11 of the flow tube 1, but can be built in its middle part, or the pump can contain two built in series. ejector bodies 2 located either at the inlet port 12 and in the middle part of the flow pipe 1 or at the inlet port 12 and at the outlet port 11 of the flow pipe 1, as can be seen from Fig. 4 and Fig. 5. Finally, the flow pipe 1 can be provided with two outlet ports 11 with a downward outlet, as can be seen in FIG. 6a, or with one or two outlet ports 11 with a horizontal outlet, as shown in FIGS. 6b and 6c, or an outlet outlet. through the outlet 11 with the outlet facing upwards, as can be seen from the diagrams in FIG. Depending on the field of application, the pump can be provided with two differently shaped and situated inlets and outlets of the pumped fluid, as schematically shown in FIGS. 1 to 5 for the various alternative solutions of FIGS.

Industrial applicability

The aeration jet pump is intended for use in installations where it is necessary to ensure the transfer of fluid between two tanks or between different spaces of the same tank, such as biological wastewater treatment plants.

Claims (4)

PATENT CLAIMS Aeration jet pump intended in particular for pumping liquids from wastewater treatment plant tanks and consisting of a vertically arranged flow pipe (1) of the pumped liquid, which is terminated in the upper part by one or two outlets (11), characterized in that it comprises at least one ejector body (2), in the inner cavity of which a suction chamber (21) of pumped fluid is formed, the flow cross-section of which is larger than the flow cross-section of the flow tube (1) and around the circumference of which an annular supply chamber (22) is formed the outer surface is provided with at least one pressure medium supply opening (23), the bottom (221) of the supply chamber (22) being blinded and in the upper part the supply chamber (22) being provided with a baffle nozzle (24) opening into a conical outlet section (25) of the ejector. body (2), the outlet cross-section of which substantially corresponds to the inlet cross-section of the flow pipe (1), when the supply openings (23) are arranged substantially in one case in the case of multiple formation. horizontal plane. Aeration nozzle pump according to Claim 1, characterized in that the supply openings (23) are guided from the supply chamber (22) outside the ejector body (2) in a radial or tangential direction. Aeration nozzle pump according to claims 1 and 2, characterized in that the ejector body (2) is attached to the inlet neck (12) of the flow tube (1) or is built into the middle part of the flow tube (1). Aeration nozzle pump according to claims 1 and 2, characterized in that it comprises two or more built-in projector bodies 1 (2), located either at the inlet neck (12) and in the middle part of the flow pipe (1) or at the inlet port (12) and at the outlet port (11) of the flow pipe (1).