CN110217957A - A kind of inactivated sludge degradation equipment of Hydrodynamic Cavitation - Google Patents

Abstract

A kind of inactivated sludge degradation equipment of Hydrodynamic Cavitation, including stator and shaft, stator interior form cavitation chamber, are provided with water inlet pipe and outlet pipe on stator；Shaft is installed in the stator, and stator is stretched out in shaft one end, which connect with transmission device, two wheel discs that axle sleeve separates are provided in shaft, wheel disc is in the cavitation chamber of stator, and cavitation hole is distributed in the side opposite with cavitation cavity wall of two wheel discs, and cavitation hole is blind hole.Make the chemical bond rupture between the hydrone in sludge and the atom of the oxygen molecule of dissolution by the high temperature and pressure that Hydrodynamic cavitation generates, and form the hydroxy radical with strong oxidizing property, to achieve the purpose that larger molecular organics of degrading.For the present invention using equipment of Hydrodynamic Cavitation degradation inactivated sludge, treating capacity is big, can work continuously, and has high efficiency, zero emission and pollution has the good feature of environmental protection；Adaptable strong, easy to control, structure is simple, high-efficient inactivated sludge degrade equipment of Hydrodynamic Cavitation the characteristics of.

Description

A hydraulic cavitation device for inactivated sludge degradation

technical field

The invention relates to an environmental protection device for degrading inactivated sludge through hydraulic cavitation, and belongs to the technical field of inactivated sludge degradation.

Background technique

Municipal sewage treatment processes are still being applied, including primary treatment, secondary treatment, and advanced treatment, but the most commonly used secondary treatment is the traditional activated sludge method as the core. The activated sludge process mainly uses microorganisms to treat sewage. The air is introduced into the sewage to increase the oxygen content in the sewage, promote the mass reproduction of various microorganisms in the sludge, and effectively remove the macromolecular organic matter in the sludge. In addition, there are improvements to this method, such as the batch activated sludge method, which is highly targeted in treating a large amount of organic matter in wastewater, and reduces the content of phosphorus, sulfur and other elements in sewage, so it is widely used in chemistry, papermaking, etc. Waiting for waste water treatment.

However, in the activated sludge process, microbial decomposition of organic matter has high requirements on the reactor. To ensure a good living environment for microorganisms, maintain a high sludge concentration and good mass transfer effect in the reactor, it is necessary to add nutrients regularly , which increases operating costs. The above-mentioned sewage treatment methods, especially the activated sludge process, will produce a large amount of muddy matter, and each sewage treatment plant will discharge excess sludge with a moisture content of about 99.2% every day, and the amount can reach hundreds or even tens of thousands of tons. These quantities are huge The sludge will become a problem that needs to be dealt with urgently in the future. The current methods of sludge treatment are mainly sanitary landfill, land use, incineration and throwing into the sea. However, the problems of these methods in terms of secondary pollution, air pollution control, investment and operating costs limit their practical application. At present, my country mainly adopts temporary landfill disposal method for urban sludge, which not only occupies a large amount of land, but also causes damage to the ecological environment. Sludge contains a large amount of polymer organic matter that can be used, so there is an urgent need for an efficient, adaptable, and easy-to-control sludge organic matter degradation device.

In the process of hydrodynamic cavitation, the conditions of extremely high pressure and high temperature are generated near the cavitation structure, and the chemical bonds between the atoms of the water molecules and the dissolved oxygen molecules in the water are broken, and hydroxyl radicals with strong oxidative properties are formed. The large amount of highly active hydroxyl radicals OH produced can oxidize the chemical substances in the sludge, and the extremely high temperature and high pressure will break the chemical bonds in the molecules to achieve the purpose of degrading macromolecular organic matter. The high pressure and high temperature generated in the cavitation phenomenon are used to strengthen the chemical and physical processes and achieve the effect of degrading the macromolecular organic matter in the sludge. For example, the Chinese patent document CN106745489A discloses a cavitation device composed of a porous orifice plate, a venturi tube and a cavitation nozzle to realize efficient sewage treatment. CN104556266A discloses an enhanced hydraulic cavitation treatment device, which can cause the fluid to collapse after cavitation to generate a large number of free radicals, effectively improving the ability of hydraulic cavitation to degrade organic pollutants, so as to achieve the purpose of improving and strengthening the effect of cavitation treatment of wastewater.

However, the current hydraulic cavitation sewage treatment devices on the market basically use Venturi tubes, and the structure of the cavitation nozzle achieves the purpose of cavitation. The above structures all have the problems of low cavitation efficiency, small sewage treatment volume, and low treatment efficiency, so they cannot be applied. in the actual sludge treatment process.

Therefore, there is an urgent need for a hydraulic cavitation device with strong adaptability, easy control, simple structure and high efficiency to degrade inactivated sludge.

Contents of the invention

Aiming at the shortcomings of the inactivated sludge degradation technology, the invention proposes a hydraulic cavitation device for inactivated sludge degradation with strong adaptability, easy control, simple structure and high efficiency.

The deactivated sludge degradation hydraulic cavitation device of the present invention adopts the following technical scheme:

The device includes a stator and a rotating shaft. A cavitation cavity is formed inside the stator, and a water inlet pipe and a water outlet pipe are arranged on the stator; the rotating shaft is installed in the stator, and one end of the rotating shaft protrudes from the stator. The two discs separated by the shaft sleeve are located in the cavitation cavity of the stator, and cavitation holes are distributed on the side opposite to the inner wall of the cavitation cavity of the two discs, and the cavitation holes are blind holes.

Both sides of the lower part of the stator are provided with water inlet pipes, and the upper part of the stator is provided with water outlet pipes.

The distance between the outer end surface of the cavitation hole and the inner wall of the stator is 4-8mm, which ensures the formation of cavitation phenomenon.

The ratio of diameter to depth of the cavitation holes is 2:5.

The cavitation hole has a diameter of 20mm and a depth of 50mm.

The rotation speed range of the rotating shaft is 1600r/min-3600r/min.

The water inlet pipe and the water outlet pipe are arranged diagonally on the stator to prevent short flow.

The above-mentioned device is used for treating sludge with a water content of about 99.2%. The principle of treating sludge is basically the same as that of treating sewage, and can realize hydraulic cavitation. The motor drives the rotating shaft to rotate at a high speed, so that the cavitation holes on the rotor and the inactivated sludge move relative to each other, thereby causing cavitation. Cavitation phenomenon refers to the process of forming and collapsing bubbles in the liquid when the local pressure inside the liquid decreases. When the liquid flows through the hydraulic structure, due to the flow limiting effect of the hydraulic structure (the water content of the sludge is high, about 99.2%), The flow rate rises sharply and the pressure drops. When the pressure drops to the saturated vapor pressure of the liquid at the working temperature, cavitation occurs. When the cavitation bubbles burst, a very small area around it will generate high pressure and high temperature. Under high temperature and high pressure conditions, the sludge in the sludge The chemical bonds between the water molecules and the atoms of the dissolved oxygen molecules will break and form hydroxyl radicals with strong oxidative properties. The chemical bonds in the molecules are broken to achieve the purpose of degrading macromolecular organic matter, and the thermal effect generated can reduce the viscosity of the sludge and make it easier to handle.

A sludge treatment system, including the above-mentioned hydraulic cavitation device, and also includes a grid tank, a water transfer tank, a neutralization tank, a primary sedimentation tank, an IC reactor, a hydrolytic acidification tank, a high-temperature inactivation treatment tank, a mud pump and treated water Collection tank; grid tank, regulating tank, neutralization tank, primary sedimentation tank, IC reactor (anaerobic reactor), hydrolytic acidification tank, high temperature inactivation treatment tank, mud pump, the hydraulic cavitation device and treated water The collection pools are connected sequentially. Sewage flows into the grid sump by itself, removes large particles of solid matter and adjusts the water quality and water quality, then flows into the adjustment tank by itself, balances the water quality and quantity, and then is lifted to the neutralization tank by the sludge pump. The pH of the sewage is adjusted by adding calcium hydroxide in the neutralization tank. The adjusted sewage enters the primary sedimentation tank to remove suspended solids by adding flocculants. After the physical and chemical reaction, the sewage is lifted by the mud pump to the IC reactor for the removal of a large amount of organic matter. After that, the wastewater enters the hydrolysis acidification tank to react to remove macromolecular organic matter and improve biodegradability. Decompose to obtain treated water, which is sent to the treated water collection tank. The water content of the sludge is up to 99%, and the sludge particles are large-size solids. The cavitation device treats solid organic matter and degrades it into small molecular substances to obtain relatively turbid treated water.

The present invention has the following characteristics:

1. The hydraulic cavitation device is used to degrade the inactivated sludge, which has a large processing capacity, continuous operation and high efficiency.

2. The symmetrical structure of double disc cavitation can effectively balance the axial force during operation, making the equipment run more smoothly and effectively increasing the service life of the equipment.

3. Using electric energy as energy, zero emission, no pollution, and good environmental protection.

4. The motor is used as the power source of the sludge treatment system, which is not affected by environmental factors and can be opened as needed, with high flexibility.

5. The working state of the present invention is normal pressure, and the sewage treatment system can run safely and stably; the structure of the present invention is relatively simple, and it is convenient for cleaning, maintenance and disassembly.

7. The present invention can be enlarged. It only needs to change the size of the rotor and stator, ensure the distance between the stator and the rotor, and replace the high-power frequency conversion motor to meet the demand for greater sludge treatment capacity.

Description of drawings

Fig. 1 is a schematic structural view of the hydraulic cavitation device of the present invention.

Fig. 2 is a structural diagram of the rotating disk in the hydraulic cavitator of the present invention.

Fig. 3 is a flow chart of inactivated sludge treatment in the present invention.

In the figure: 1. The first water inlet pipe, 2. Sealing cover, 3. Sealing device, 4. Angular contact ball bearing, 5. End cover, 6. Shaft, 7. Water outlet pipe, 8. Stator, 9. Cavitation hole (Blind hole), 10. Wheel disc, 11. Shaft sleeve, 12. Bolt, 13. Seal ring, 14. Wedge key, 15. End cover, 16. Seal ring, 17. Second water inlet pipe, 18. Coupling 19. Frequency conversion motor.

Detailed ways

As shown in FIG. 1 , the deactivated sludge degradation hydraulic cavitation device of the present invention includes a stator 8 , a disc 10 and a rotating shaft 6 .

Inside the stator 8 is a closed cavitation cavity. To facilitate processing, at least one end of the stator 6 is an end cover 15 connected by bolts 12, and a sealing washer 13 is provided at the connection. The two ends of the stator 8 are respectively provided with bearing shells 2, and angular contact ball bearings 4 are installed in the bearing shells 2. The bearing shell 2 is connected with a sealing cover 5, and a sealing ring 16 is arranged at the connection to realize sealing. Both sides of the lower end of the stator 8 are respectively connected to the first water inlet pipe 1 and the second water inlet pipe 17 , and the upper end of the stator 8 is connected to the water outlet pipe 7 . For preventing short flow phenomenon, water inlet pipe and water outlet pipe are preferably diagonally arranged on stator 8, so also can not need second water inlet pipe 17.

The rotating shaft 6 is installed in the stator 8 through the angular contact ball bearings 4 at both ends of the stator 8. One end of the rotating shaft 6 protrudes from the end cover 15 on the stator 8. The extended end is connected with the motor 19 through the coupling 18. The motor 19 adopts frequency conversion motor. The motor 19 drives the rotating shaft 6 to rotate. The rotating shaft 6 is provided with a sealing device 3 in the bearing housing 2 at both ends of the stator 8, and a mechanical seal can be used to isolate the sewage and prevent leakage.

Two wheel discs 10 are arranged on the rotating shaft 6 , and the two wheel discs 10 are fixed by setting a shaft sleeve 11 . Both discs 10 are located in the cavitation cavity of the stator 8 and are connected to the rotating shaft 6 through wedge keys 14 so that the discs 10 and the rotating shaft 6 rotate together. Cavitation holes 9 are distributed on the outer surface of the wheel disc 10, and the cavitation holes 9 are blind holes. The distance between the outer end surface of the cavitation holes 9 and the inner wall of the stator 8 is 4-8mm, so as to ensure the formation of cavitation phenomenon. The rotating speed of the wheel disc 10 is 1600r/min-3600r/min, the depth of the cavitation hole 9 is 50mm, the diameter is 20mm, and the ratio of diameter to depth is 2:5. These parameters are obtained through a large number of experiments according to the characteristics of inactivated sludge degradation, and achieve the best match of degradation efficiency, effect and cost.

The distribution of the cavitation holes 9 on the outer surface of the disc 10 is shown in FIG. 2 . Cavitation holes are provided on the outer surface of the rotor 10 to improve cavitation efficiency and sludge degradation rate.

The stator 8 is fixed on the foundation. The material of the disc 10 is duplex steel nitrided. After the assembled wheel disc 10 is installed on the rotating shaft 6, the angular contact bearing 4 is installed on the rotating shaft 6, and then the stator end cover 15, the mechanical seal 3 and the sealing cover are assembled.

The inactivated sludge enters the cavitation cavity of the stator 8 through the first water inlet pipe 1 and the second water inlet pipe 17, and the rotating shaft 6 drives the wheel disc 10 to rotate, causing cavitation to degrade the inactivated sludge, and finally produce Water is output by outlet pipe 7 and enters the treated water collection tank.

As shown in Figure 3, the sewage treatment system using the deactivated sludge degrading hydraulic cavitation device of the present invention, in addition to including the above-mentioned hydraulic cavitation device, also includes a grid tank, a regulating tank, a neutralization tank, a primary sedimentation tank, IC reactor, hydrolytic acidification tank, high temperature deactivation treatment tank, mud pump, treated water collection tank, all parts are existing conventional structures, hydraulic adjustment, neutralization, hydrolysis acidification, high temperature deactivation treatment, etc. are all existing technologies . Grid pool, water transfer pool, neutralization pool, primary sedimentation tank, IC reactor, hydrolytic acidification pool, high temperature inactivation treatment pool, mud pump, hydraulic cavitation device and treated water collection pool are connected in sequence.

The sludge flows into the grid sump by itself, removes large particles of solid matter and adjusts the water quantity and quality, then flows into the adjustment tank by gravity, balances the water quality and quantity, and then is lifted to the neutralization tank by the sludge pump. Calcium hydroxide is added to the neutralization tank to adjust the pH of the sludge. Then enter the primary sedimentation tank, and remove the suspended solids by adding flocculant. After the sludge undergoes physical and chemical reactions, it is lifted by the pump to the IC reactor, and a large amount of organic matter is removed through anaerobic reaction. Afterwards, the sludge enters the hydrolysis acidification tank to react to remove macromolecular organic matter and improve biodegradability, etc., and perform high-temperature inactivation in the high-temperature inactivation treatment tank, that is, keep it at a high temperature of 121° for 30 minutes to achieve the elimination of microorganisms in the sludge. active treatment to obtain inactivated sludge. The inactivated sludge after high-temperature inactivation is sent to the hydraulic cavitation device by the mud pump to degrade the inactivated sludge, decompose the macromolecular organic matter, and obtain treated water. The treated water is exported from the hydraulic cavitator. After the sludge is treated by the hydraulic cavitator, the macromolecular organic matter inside it is decomposed into small molecular substances, and the deactivated sludge is degraded. The internal particle size becomes smaller, and relatively turbid water is obtained. - Treat water. The water content of the sludge is up to 99%, and the sludge particles are large-size solids. The cavitation device treats solid organic matter and degrades it into small molecular substances to obtain relatively turbid treated water. The treated water is sent to the treated water collection tank.

Claims (8)

1. The equipment of Hydrodynamic Cavitation 1. a kind of inactivated sludge is degraded, it is characterized in that: including stator and shaft, stator interior forms cavitation Chamber is provided with water inlet pipe and outlet pipe on stator；Shaft is installed in the stator, and stator, the extension end and biography are stretched out in shaft one end Dynamic device connects, and is provided with two wheel discs that axle sleeve separates in shaft, wheel disc is in the cavitation chamber of stator, two wheel discs The side opposite with cavitation cavity wall be distributed with cavitation hole, cavitation hole is blind hole.
2. 2. inactivated sludge degradation equipment of Hydrodynamic Cavitation according to claim 1, it is characterized in that: stator lower part two sides are all provided with It is equipped with water inlet pipe, stator top is provided with outlet pipe.
3. 3. inactivated sludge degradation equipment of Hydrodynamic Cavitation according to claim 1, it is characterized in that: the outer end face of the cavitation hole The distance between inner wall of stator is 4-8mm.
4. 4. according to claim 1 inactivated sludge degrade equipment of Hydrodynamic Cavitation, it is characterized in that: the diameter of the cavitation hole with The ratio between depth is 2:5.
5. 5. inactivated sludge degradation equipment of Hydrodynamic Cavitation according to claim 1, it is characterized in that: the diameter of the cavitation hole is 20mm, depth 50mm.
6. 6. inactivated sludge degradation equipment of Hydrodynamic Cavitation according to claim 1, it is characterized in that: the range of speeds of the shaft is 1600r/min-3600r/min。
7. 7. inactivated sludge degradation equipment of Hydrodynamic Cavitation according to claim 1, it is characterized in that: the water inlet pipe and outlet pipe exist Diagonally it is arranged on stator.
8. 8. a kind of sewage disposal system, including the degradation equipment of Hydrodynamic Cavitation of inactivated sludge described in claim 1-8, further include grid Pond, water transfer pond, neutralization pond, primary sedimentation tank, IC reactor, hydrolysis acidification pool, high temperature deactivation processing pond, slush pump and processing water are collected Pond, it is grid pond, water transfer pond, neutralization pond, primary sedimentation tank, IC reactor, hydrolysis acidification pool, high temperature deactivation processing pond, slush pump, described Equipment of Hydrodynamic Cavitation and processing water collecting pit are sequentially connected.