CN113816575A - Method for degrading excess sludge by using hydrodynamic cavitation device - Google Patents
Method for degrading excess sludge by using hydrodynamic cavitation device Download PDFInfo
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- CN113816575A CN113816575A CN202111268063.1A CN202111268063A CN113816575A CN 113816575 A CN113816575 A CN 113816575A CN 202111268063 A CN202111268063 A CN 202111268063A CN 113816575 A CN113816575 A CN 113816575A
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- sludge
- hydrodynamic cavitation
- cavitation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/02—Temperature
Abstract
The invention belongs to the field of hydrodynamic cavitation application, and particularly relates to a method for degrading excess sludge by using a hydrodynamic cavitation device. The method comprises the following steps: and (3) placing the excess sludge in a degradation tank, entering the excess sludge into a cavitation reactor through a water pump, performing hydrodynamic cavitation to degrade the excess sludge, returning the excess sludge into the degradation tank through a pipeline, and performing circular degradation. The hydraulic cavitation degradation device comprises a degradation pool, wherein the upper part of the degradation pool is connected with a water outlet pipe, the bottom of the degradation pool is connected with a water inlet pipe, and the water inlet pipe is sequentially connected with a water pump, a valve I, a pressure gauge, a flowmeter II, a cavitation reactor, a flowmeter I, a valve III and a water outlet pipe through pipelines. The cavitation reactor is a pore plate provided with a Venturi through hole, and the thickness of the pore plate is 1-10 mm; the venturi through hole is composed of a contraction section, a throat part and a diffusion section, the length of the throat part is 2-3 mm, and the emission angle alpha is 5-20 degrees. The method has the advantages of low cost, simple and efficient device, no byproduct generation, no secondary pollution, suitability for large-scale treatment of excess sludge and improvement of sludge treatment efficiency.
Description
Technical Field
The invention belongs to the field of hydrodynamic cavitation application, and particularly relates to a method for degrading excess sludge by using a hydrodynamic cavitation device.
Background
Water is a source of all life on the earth, but pollution and misuse of water resources are becoming more serious in recent years. With the rapid development of industry and agriculture, people gradually deepen the understanding and understanding of water resources. Therefore, how to reasonably discharge and effectively degrade the sewage is one of the biggest problems to the global water environment. Conventional sewage treatment methods such as adsorption, coagulation, membrane separation and biological methods, but the actual degradation rate of the sludge is not high, and thus none of them has been considered as the most effective method for sewage treatment. However, in the last few years advanced oxidation techniques as well as cavitation have shown good performance in treating sewage. Therefore, people are gradually cognizant in seeking a method for treating excess sludge with high efficiency, energy conservation, harmlessness and recycling.
Disclosure of Invention
The invention aims to overcome the defect of low sludge treatment efficiency at the present stage, and provides a sludge reduction device and a method which have the advantages of simple structure, detachable device, recyclable treatment and low treatment cost on the basis, do not generate by-products, do not cause secondary pollution and can realize the recycling treatment of residual sludge.
In order to solve the technical problems, the invention adopts the technical scheme that: a method for degrading excess sludge by using a hydrodynamic cavitation device comprises the following steps: and (3) placing the residual sludge in a degradation tank of a hydrodynamic cavitation device, entering the cavitation reactor of the hydrodynamic cavitation degradation device through the residual sludge of a water pump, performing hydrodynamic cavitation degradation on the residual sludge, returning the residual sludge to the degradation tank through a pipeline, and performing circular degradation.
The method for degrading the excess sludge by using the hydrodynamic cavitation device comprises a degradation pool, wherein the upper part of the degradation pool is connected with a water outlet pipe, the bottom of the degradation pool is connected with a water inlet pipe, the water inlet pipe is sequentially connected with a water pump, a valve I, a pressure gauge, a flow meter II, a cavitation reactor, a flow meter I, a valve III and a water outlet pipe through pipelines, and a stirrer is arranged in the degradation pool.
In the method for degrading the excess sludge by using the hydrodynamic cavitation device, the cavitation reactor is a pore plate provided with a Venturi through hole, and the thickness of the pore plate is 1-10 mm; the venturi through hole is composed of a contraction section, a throat part and a diffusion section, the length of the throat part is 2-3 mm, and the emission angle alpha is 5-20 degrees.
In the method for degrading the excess sludge by using the hydrodynamic cavitation device, the hydrodynamic cavitation degradation device is also provided with an auxiliary pipeline, the outlet of the water pump is connected with a valve II, and the other end of the valve II is connected with the upper part of the degradation tank.
In the method for degrading the excess sludge by using the hydrodynamic cavitation device, the concentration of the excess sludge in the degradation pool is 1000-2000 mg/L.
In the method for degrading the excess sludge by using the hydrodynamic cavitation device, the temperature in the degradation tank is 35-45 ℃.
According to the method for degrading the excess sludge by using the hydrodynamic cavitation device, the rotating speed of the stirrer in the degradation pool is adjusted to be 150-200 RPM.
In the method for degrading the excess sludge by using the hydrodynamic cavitation device, the pressure gauge is set to be 3-5 bar.
The invention creatively provides a process for treating sludge by utilizing a hydrodynamic cavitation technology, wherein the process for degrading sludge by cavitation comprises the following steps: the sludge is pressurized by a sludge pump and then enters the orifice plate at a higher pressure to generate cavitation, the flow velocity is suddenly increased under the throttling action of the orifice plate, the pressure is reduced at the highest speed, and the cavitation bubbles can generate strong shock waves and micro-jet in the development process from collapse to collapse, so that strong disturbance, even mechanical effects such as breakage, shearing force and the like can be generated in a water body.
The invention has the following beneficial effects:
1. with the rapid development of industry and agriculture, people gradually deepen the understanding and understanding of water resources. Therefore, how to reasonably discharge and effectively degrade the sewage is one of the biggest problems to the global water environment. Conventional sewage treatment methods such as adsorption, coagulation, membrane separation and biological methods, but the actual degradation rate of the sludge is not high, and thus none of them has been considered as the most effective method for sewage treatment. Therefore, a method for treating sludge is urgently needed, and the method provides a device and a method for efficiently treating sludge, has great significance for the degradation of sludge, and can be widely applied to other waste water.
2. This device adds agitating unit in degradation bottom of the pool on the basis of cavitation for inside mixed liquid obtains intensive mixing before getting into the sludge pump, strengthens the efficiency of cavitation.
3. This device adds temperature regulating device in degradation inslot portion, through the accurate control of handle to the temperature, reduces the influence that the high temperature that the cavitation produced explains mud, and the reinforcing subtracts mud efficiency.
4. The device disclosed by the invention is mainly used for realizing the breaking of the sludge in a cavitation shearing force mode, is clean and environment-friendly, and has the advantages of simple structure, mild reaction conditions, recyclability, detachability, controllable process, industrialization and the like.
5. The device comprises a main pipeline and an auxiliary pipeline, and the main pipeline and the auxiliary pipeline are both provided with throttle valves, so that the pressure of the main pipeline can be changed through the adjustment of the main pipeline and the auxiliary pipeline, and the optimal degradation pressure of sludge in different stages can be reached.
Drawings
FIG. 1 is a schematic structural diagram of a device for breaking excess sludge by hydrodynamic cavitation technology in the invention;
FIG. 2 is a graph showing the respective effects of a control orifice plate provided with a Venturi through hole and a Venturi tube on a sludge SCOD in example 2;
FIG. 3 is a drawing showing the comparison between the orifice plate having a Venturi hole and the Venturi tube in example 2, and the Venturi tube for sludge DDSCODInfluence graph of (2);
FIG. 4 is a graph showing the effects of a control orifice plate having a venturi through hole and a venturi tube on sludge MLSS and MLVSS, respectively, in example 2;
FIG. 5 is a graph showing the respective effects of the control, the orifice plate having the venturi through-hole, and the venturi tube on the sludge particle size distribution in example 2;
FIG. 6 is a graph showing the effects of the control, the orifice plate having the venturi through-hole, and the venturi tube on the concentration of extracellular polymers (proteins & polysaccharides) in sludge in example 2.
FIG. 7 is a schematic structural view of a venturi through hole.
Labeled as: 1 degradation pond, 2 outlet pipes, 3 valves III, 4 flow meters I, 5 cavitation reactors, 6 flow meters II, 7 pressure gauges, 8 valves I, 9 water pumps, 10 inlet tubes, 11 valves II.
Detailed Description
Example 1
The hydraulic cavitation degradation device comprises a degradation tank 1, wherein the upper part of the degradation tank 1 is connected with a water outlet pipe 2, the bottom of the degradation tank is connected with a water inlet pipe 10, and the water inlet pipe 10 is sequentially connected with a water pump 9, a valve I8, a pressure gauge 7, a flow meter II 6, a cavitation reactor 5, a flow meter I4, a valve III 3 and a water outlet pipe 2 through pipelines. The cavitation reactor 5 is a pore plate provided with a Venturi through hole, and the thickness of the pore plate is 1-10 mm; the venturi through hole is composed of a contraction section, a throat part and a diffusion section, the length of the throat part is 2-3 mm, and the emission angle alpha is 5-20 degrees. The hydraulic cavitation degradation device is also provided with an auxiliary pipeline, the outlet of the water pump 9 is connected with a valve II 11, and the other end of the valve II 11 is connected with the upper part of the degradation pool 1.
A method for degrading excess sludge by utilizing hydrodynamic cavitation. And (3) placing the excess sludge into a degradation tank 1 of a hydrodynamic cavitation device, allowing the excess sludge to enter a cavitation reactor 5 through a water pump 9 for hydrodynamic cavitation degradation, and returning the excess sludge into the degradation tank 1 through a pipeline for cyclic degradation.
Example 2
In the embodiment, the mixed sludge stock solution is used as a degradation product, and the hydraulic cavitation technology is adopted to degrade the excess sludge for degradation experiments. The method comprises the following specific steps:
adopting sludge crops in a secondary sedimentation tank of a sewage treatment plant to degrade a substrate, adjusting the sludge concentration to be 1000-2000mg/L, placing a sludge mixed solution in a degradation tank 1, circulating the sludge mixed solution through a sludge pump 9, respectively adopting the hydrodynamic cavitation degradation device, the orifice plate and the venturi tube sludge described in the embodiment 1 to degrade, and respectively measuring corresponding data when the sludge concentration is 0, 30, 60, 90, 120, 150, 180, 210 and 240 min.
And (I) the hollow pipe is compared with the pore plate with the Venturi through hole and the Venturi tube, and the influence of the Venturi tube on the sewage SCOD is respectively realized.
The method comprises the following steps: taking the sludge stock solution of the secondary sedimentation tank, adjusting the concentration of the sludge stock solution to 1000-2000mg/L, and introducing the sludge into a degradation tank. Respectively using an empty pipe, a pore plate with a Venturi through hole and a Venturi pipe as cavitators, adjusting the temperature to 35 ℃, adjusting an auxiliary pipeline to ensure that the inlet pressure is 3-5 bar, carrying out a circulating reaction for 240min, and respectively measuring the SCOD concentration of the sludge in the degradation tank at 0min, 30 min, 60 min, 90 min, 120 min, 150 min, 180 min, 210 min and 240 min.
As shown in figure 2, SCOD in the sludge is used for representing the biological oxygen demand of the sludge, the SCOD values of the sludge supernatant are measured at 0min, 30 min, 60 min, 90 min, 120 min, 150 min, 180 min, 210 min and 240min respectively, and as can be seen from figure 2, the SCOD values measured by the three treatment modes are increased to different degrees along with the increase of time, the cavitation effect is superior to the physical effect, and the cavitation effect of a Venturi tube is superior to that of a hole plate.
(II) the hollow pipe is compared with the pore plate with the Venturi through hole and the Venturi tube to respectively treat the sewage DDSCODThe influence of (c).
The method comprises the following steps: taking the sludge stock solution of the secondary sedimentation tank, adjusting the concentration of the sludge stock solution to 1000-2000mg/L, and introducing the sludge into a degradation tank. Respectively using an empty pipe, a pore plate with a Venturi through hole and a Venturi pipe as cavitators, adjusting the temperature to 35 ℃, adjusting an auxiliary pipeline to ensure that the inlet pressure is 3-5 bar, performing a circulating reaction for 240min, and respectively measuring DD of sludge in a degradation tank at 0min, 30 min, 60 min, 90 min, 120 min, 150 min, 180 min, 210 min and 240minSCOD。
DDSCODThe disintegration degree of sludge cells can be reflected in a sludge degradation experiment, and the sludge supernatant DD is respectively measured in 0, 30, 60, 90, 120, 150, 180, 210 and 240minSCODThe numerical values, as can be seen from FIG. 3, the slope of the straight line of the venturi tube is greater than that of the orifice plate and the control with the increase of the cycle time, so that the cavitation effect of different cavitation devices on DD thereof can be obtainedSCODThe sludge breaking rate is 40% in 240min, so that the cavitation effect of the Venturi tube has higher sludge breaking rate compared with other cavitation devices.
And (III) the hollow pipe contrast, the pore plate with the Venturi through hole and the Venturi tube respectively influence the sewage MLSS.
The method comprises the following steps: taking the sludge stock solution of the secondary sedimentation tank, adjusting the concentration of the sludge stock solution to 1000-2000mg/L, and introducing the sludge into a degradation tank. Respectively using an empty pipe, a pore plate with a Venturi through hole and a Venturi pipe as cavitators, adjusting the temperature to 35 ℃, adjusting an auxiliary pipeline to ensure that the inlet pressure is 3-5 bar, performing a circulating reaction for 240min, and respectively measuring MLSS and MLVSS of sludge in the degradation tank at 0min, 30 min, 60 min, 90 min, 120 min, 150 min, 180 min, 210 min and 240 min.
MLSS (sludge concentration) and MLVSS (mixed liquor volatile suspended solids) are mainly used for representing the activated sludge concentration of the sludge and the number of microorganisms in the sludge, and as can be seen from FIG. 4, the three lines are all decreased from 1300mg/L of the starting point, and the MLSS decreasing trend of the venturi tube and the MLSS decreasing trend of the orifice plate are similar and higher than those of the control group; venturi MLVSS showed a significant decrease compared to both the well plate and the control. From the above, the venturi tube has a small influence on the concentration of the activated sludge, and has a significant influence on the number of microorganisms in the sludge.
And (IV) the hollow pipe is compared with the pore plate with the Venturi through hole and the Venturi tube, and the influence of the pore plate with the Venturi through hole and the Venturi tube on the sludge particle size is respectively realized.
The method comprises the following steps: taking the sludge stock solution of the secondary sedimentation tank, adjusting the concentration of the sludge stock solution to 1000-2000mg/L, and introducing the sludge into a degradation tank. Respectively using an empty pipe, a pore plate with a Venturi through hole and a Venturi pipe as cavitators, adjusting the temperature to 35 ℃, adjusting an auxiliary pipeline to ensure that the inlet pressure is 3-5 bar, carrying out a circulating reaction for 240min, and respectively measuring the particle size distribution of sludge in the degradation tank at 0min, 30 min, 60 min, 90 min, 120 min, 150 min, 180 min, 210 min and 240 min.
FIG. 5 is mainly used for characterizing the particle size of sludge, and it can be seen from the graph that the particle size of untreated raw sludge is mainly distributed between 20-40 μm, the particle size of contrast treated sludge is mainly distributed between 5-20 μm, the particle size of sludge treated by a pore plate group is distributed between 3-15 μm, and the particle size of sludge treated by a venturi tube group is intensively distributed in two regions, which are 0.01-0.3 μm and 3-11 μm respectively. Therefore, the untreated sludge is zoogloea of the sludge and is a polymer of a plurality of cells; after the treatment of the physical action of the contrast, the joints among the sludge cells are broken up, so that the particle size is reduced; after the cavitation treatment of the perforated plate group, the sludge particle size is reduced again, which indicates that the cavitation has higher scattering effect relative to the physical effect, and the cells are broken, so that the breaking rate of bacteria is increased; after the cavitation treatment of the venturi tube, a new area of the sludge particle size shows that substances in the sludge cell are discharged, so that the particle size is smaller, the cavitation effect of the venturi tube is better than that of a pore plate, and the disintegration degree of the sludge cell is more thorough.
And fifthly, the hollow pipe contrast, the pore plate with the Venturi through hole and the Venturi tube respectively influence sludge extracellular polymers (protein and polysaccharide).
The method comprises the following steps: taking the sludge stock solution of the secondary sedimentation tank, adjusting the concentration of the sludge stock solution to 1000-2000mg/L, and introducing the sludge into a degradation tank. Respectively using an empty pipe, a pore plate with a Venturi through hole and a Venturi pipe as cavitators, adjusting the temperature to 35 ℃, adjusting an auxiliary pipeline to ensure that the inlet pressure is 3-5 bar, carrying out a circulating reaction for 240min, and respectively measuring the content of sludge extracellular polymers (protein and polysaccharide) in the degradation tank at 0min, 30 min, 60 min, 90 min, 120 min, 150 min, 180 min, 210 min and 240 min.
FIG. 6 is used mainly to characterize extracellular polymer concentrations (protein, polysaccharide) of sludge, where LB-EPS is loosely attached EPS, TB-EPS is tightly attached EPS, and the treatment time for each effect is 240 min. From FIG. 6, it can be seen that the proteins of both LB-EPS and TB-EPS show a decreasing trend, which indicates that the cavitation effect has a more obvious effect on the proteins in the extracellular polymeric substance; as can be seen from the right graph, the effect of venturi treatment on exopolysaccharides is relatively obvious, while the effect of the orifice plate is not outstanding enough, so that the venturi treatment sludge can be considered to have a significant effect on the treatment of exopolymers (proteins).
Claims (8)
1. A method for degrading excess sludge by using a hydrodynamic cavitation device is characterized by comprising the following steps: the excess sludge is placed in a degradation tank (1) of a hydrodynamic cavitation device, enters a cavitation reactor (5) of the hydrodynamic cavitation degradation device through a water pump (9) to be subjected to hydrodynamic cavitation degradation, and then returns to the degradation tank (1) through a pipeline to be subjected to cyclic degradation.
2. The method for degrading residual sludge by using the hydrodynamic cavitation device as claimed in claim 1, wherein the hydrodynamic cavitation degradation device comprises a degradation tank (1), the upper part of the degradation tank (1) is connected with a water outlet pipe (2), the bottom of the degradation tank is connected with a water inlet pipe (10), the water inlet pipe (10) is sequentially connected with a water pump (9), a valve I (8), a pressure gauge (7), a flow meter II (6), a cavitation reactor (5), a flow meter I (4), a valve III (3) and a water outlet pipe (2) through pipelines, and a stirrer is arranged in the degradation tank (1).
3. The method for degrading the excess sludge by using the hydrodynamic cavitation device according to claim 1, wherein the cavitation reactor (5) is a pore plate provided with a Venturi through hole, and the thickness of the pore plate is 1-10 mm; the venturi through hole is composed of a contraction section, a throat part and a diffusion section, the length of the throat part is 2-3 mm, and the emission angle alpha is 5-20 degrees.
4. The method for degrading residual sludge by using the hydrodynamic cavitation device as claimed in claim 1, wherein the hydrodynamic cavitation degradation device is further provided with an auxiliary pipeline, the outlet of the water pump (9) is connected with a valve II (11), and the other end of the valve II (11) is connected with the upper part of the degradation tank (1).
5. The method for degrading excess sludge by using the hydrodynamic cavitation device as claimed in claim 1, wherein the concentration of the excess sludge in the degradation tank (1) is 1000-2000 mg/L.
6. The method for degrading residual sludge by using the hydrodynamic cavitation device as claimed in claim 1, wherein the temperature in the degradation tank (1) is 35-45 ℃.
7. The method for degrading residual sludge by using the hydrodynamic cavitation device as claimed in claim 1, wherein the rotation speed of the stirrer in the degradation tank is adjusted to 150-200 RPM.
8. The method for degrading residual sludge by using the hydrodynamic cavitation device as claimed in claim 1, wherein the pressure gauge (7) is set to 3 to 5 bar.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115784543A (en) * | 2022-11-21 | 2023-03-14 | 辽宁大学 | Sludge reduction device and sludge reduction method based on hydrodynamic cavitation coupled aerobic digestion |
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Application publication date: 20211221 |