A device for driving salted sludge particles by using hydrostatic pressure

Abstract

The application discloses a device for driving salted particle sludge by using hydrostatic pressure, wherein a reactor body of the device is sequentially provided with a sludge precipitation area, a first salted particle sludge area, a second salted particle sludge area and a third salted particle sludge area from top to bottom and in communication with each other. A total sludge particle overflow port is formed in the side wall of the sludge precipitation area. Feed ports are formed in the side walls of the first salted particle sludge area, the second salted particle sludge area and the third salted particle sludge area and are in communication with a first hydrocyclone, a second hydrocyclone and a third hydrocyclone respectively. Overflow pipes are arranged at the top of the three hydrocyclones, and discharge ports are formed at the bottom of the three hydrocyclones. The three overflow pipes are in communication with the total sludge particle overflow port through pipelines, and the three discharge ports are in communication with a total salt particle discharge port through pipelines. The device directly provides an inlet flow rate for the hydrocyclone by using the pressure difference of the reactor, thereby avoiding the problem of sludge particle breakage caused by pumping salted particle sludge.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of devices for sorting saltified anaerobic ammonium oxidation granular sludge, and particularly relates to a device for sorting saltified granular sludge by using hydrostatic pressure to drive cyclone. BACKGROUND

[0002] Anaerobic ammonium oxidation (Anammox) is a new generation of biological denitrification technology for wastewater. The technology uses microbial processes to produce nitrogen gas by using ammonia as an electron donor and nitrite as an electron acceptor. Compared with traditional biological nitrification-denitrification denitrification technology, Anammox technology has the advantages of reducing aeration energy consumption, reducing the amount of residual sludge produced and greenhouse gas emissions, not requiring the addition of organic carbon sources, and saving operating costs. Anammox process has been widely used in biological denitrification treatment of wastewater. Many industrial wastewater has the characteristics of containing nitrogen and high salt. High-salinity wastewater refers to wastewater with a sodium chloride salinity of more than 1% (mass fraction) or a total dissolved solids (TDS) of more than 3.5% (mass fraction). High-salinity wastewater denitrification is an important development direction of anaerobic ammonium oxidation process.

[0003] AnAOB (Anammox Ammonium-Oxidizing Bacteria) refers to anaerobic ammonium oxidation bacteria. In an upflow anaerobic reactor, AnAOB is prone to form microbial aggregates, i.e. granular sludge. Anammox granular sludge is composed of functional bacteria, extracellular polymeric substances (EPS) and pores. When treating high-salinity wastewater, granular sludge is soaked in a high-salinity solution, which causes the granular sludge to be salted, reduces the ion concentration difference inside and outside the sludge, and thus affects mass transfer. More importantly, the mass transfer channels inside and outside the Anammox granular sludge are mainly composed of pores formed by cells and EPS, and most of them are capillary pores. Due to the adsorption and concentration of salt by surface functional groups, salted granular sludge is prone to form salt crystals and block pores. Therefore, under high-salinity conditions, the salting process of Anammox granular sludge will cause mass transfer to weaken, ultimately affecting the denitrification efficiency.

[0004] As a solid-liquid separation device, a cyclone separator has the advantages of small footprint and low construction cost, and is widely used in the fields of wastewater treatment and water quality purification. When a cyclone separator is used in combination with an anaerobic ammonium oxidation process, the weight of the anaerobic ammonium oxidation granules is relatively large, while the weight of the salt crystal particles is relatively small. Therefore, the cyclone separator can be used to "desalt" the anaerobic ammonium oxidation granules and separate the salt crystal particles.

[0005] However, when using a hydrocyclone to separate granular sludge, the problem of granular sludge breaking when the water pump is fed may be encountered. Studies have shown that most large granular sludge is prone to breaking during pumping, and little breaking occurs during hydrocyclone separation. This also causes difficulties in the design of the hydrocyclone. If the size of the hydrocyclone is too small, it is easy to be blocked; if the size of the hydrocyclone is too large, a larger power needs to be provided to the water pump to achieve a larger inlet flow rate. If the inlet flow rate of the hydrocyclone is too low, separation cannot be achieved, but providing a larger power to the water pump will break part of the granular sludge, which is not conducive to the formation of granular sludge. Therefore, it is urgent to develop a device for separating and salinizing granular sludge that can avoid the breaking of granular sludge caused by the water pump feeding the hydrocyclone. SUMMARY

[0006] The purpose of the present application is to solve the problems of the prior art and provide a device for separating and salinizing granular sludge by driving a cyclone with hydrostatic pressure.

[0007] The specific technical solutions adopted by the present application are as follows:

[0008] The present application provides a device for separating and salinizing granular sludge by driving a cyclone with hydrostatic pressure, which comprises a reactor body and a hydrocyclone assembly. The reactor body is sequentially connected from top to bottom as a sludge sedimentation zone, a first salinized granular sludge zone, a second salinized granular sludge zone and a third salinized granular sludge zone. The sludge sedimentation zone has a water outlet and a total sludge particle overflow outlet on the side wall. The third salinized granular sludge zone has a water inlet at the bottom of the side wall for feeding the high-salinity nitrogen-containing wastewater to be treated.

[0009] The hydrocyclone assembly comprises a first hydrocyclone, a second hydrocyclone and a third hydrocyclone fixed on the outside of the reactor body. The first hydrocyclone is arranged at the junction of the first salinized granular sludge zone and the second salinized granular sludge zone, the second hydrocyclone is arranged at the junction of the second salinized granular sludge zone and the third salinized granular sludge zone, and the third hydrocyclone is arranged at the bottom of the third salinized granular sludge zone.

[0010] The side wall of the first salinized granular sludge zone is provided with a first feed inlet, and the first feed inlet is in communication with the first hydrocyclone. The first hydrocyclone is provided with a first overflow pipe at the top and a first discharge outlet at the bottom. The side wall of the second salinized granular sludge zone is provided with a second feed inlet, and the second feed inlet is in communication with the second hydrocyclone. The second hydrocyclone is provided with a second overflow pipe at the top and a second discharge outlet at the bottom. The side wall of the third salinized granular sludge zone is provided with a third feed inlet, and the third feed inlet is in communication with the third hydrocyclone. The third hydrocyclone is provided with a third overflow pipe at the top and a third discharge outlet at the bottom.

[0011] The first overflow pipe, the second overflow pipe and the third overflow pipe are respectively communicated with the total sludge particle overflow port through pipes. The first discharge port, the second discharge port and the third discharge port are respectively communicated with the total salt particle discharge port through pipes.

[0012] Preferably, the salted granular sludge in the reactor body is divided into small particle size salted granular sludge, medium particle size salted granular sludge and large particle size salted granular sludge under the action of gravity, and is respectively distributed in the first salted granular sludge area, the second salted granular sludge area and the third salted granular sludge area.

[0013] Further, the particle size range of the small particle size salted granular sludge is 0.2-1mm, the particle size range of the medium particle size salted granular sludge is 1-2mm, and the particle size of the large particle size salted granular sludge is greater than 2mm.

[0014] Preferably, the volume ratio of the sludge sedimentation area, the first salted granular sludge area, the second salted granular sludge area and the third salted granular sludge area is 0.8:1.0:1.0:1.0.

[0015] Preferably, the total sludge particle overflow port is arranged on the side wall of the sludge sedimentation area at a distance of 1 / 10-1 / 8 from the bottom, and the vertical distance between the total sludge particle overflow port and the water outlet is 2-3m.

[0016] Preferably, the vertical distance between the first feed port and the water outlet is 5-6m, and the diameter of the first feed port is 20-24mm, so that the flow rate of the small particle size salted granular sludge entering the first hydrocyclone is 7.0-8.0m / s. The vertical distance between the second feed port and the water outlet is 8-9m, and the diameter of the second feed port is 45-50mm, so that the flow rate of the medium particle size salted granular sludge entering the second hydrocyclone is 10-11.0m / s. The vertical distance between the third feed port and the water outlet is 11-12m, and the diameter of the third feed port is 65-70mm, so that the flow rate of the large particle size salted granular sludge entering the third hydrocyclone is 13.0-14.0m / s.

[0017] Preferably, the diameter of the first overflow pipe is 14-19mm, and the depth of insertion into the first hydrocyclone is 30-38mm. The diameter of the second overflow pipe is 35-44mm, and the depth of insertion into the second hydrocyclone is 70-79mm. The diameter of the third overflow pipe is 80-84mm, and the depth of insertion into the third hydrocyclone is 100-112mm.

[0018] Preferably, the diameter of the first discharge port is 8-10mm. The diameter of the second discharge port is 18-20mm. The diameter of the third discharge port is 25-28mm.

[0019] Preferably, the first hydrocyclone has a cylindrical portion with a diameter of 90-95 mm, a height of 135-143 mm, and a bottom cone angle of 20°. The second hydrocyclone has a cylindrical portion with a diameter of 195-198 mm, a height of 234-238 mm, and a bottom cone angle of 20°. The third hydrocyclone has a cylindrical portion with a diameter of 274-279 mm, a height of 220-223 mm, and a bottom cone angle of 20°.

[0020] Preferably, the water inlet is arranged on the side wall at a distance of 1 / 10-1 / 8 of the height of the third salted granular sludge zone from the bottom.

[0021] Compared with the prior art, the present application has the following advantages:

[0022] 1) The device provided by the present application comprises an anaerobic ammonia oxidation reactor body and three hydrocyclones, which are arranged at different heights of the reactor body. The pressure difference of the reactor is used to directly provide an inlet flow rate for the hydrocyclones, thereby replacing the water pump to provide power to obtain the inlet flow rate, and avoiding the problem of sludge breakage caused by pumping salted granular sludge. The device is complementary in function, compact in structure, and small in floor area.

[0023] 2) The device provided by the present application uses hydrocyclones to separate salted granular sludge, which has high separation efficiency, wide operation range, and low construction cost, and can efficiently desalt.

[0024] 3) The present application can realize staged desalination through reasonable design of the internal configuration of the hydrocyclone and reasonable control of the inlet flow rate. At the same time, the separated salt crystals can be recycled, thereby realizing economic and efficient recycling of high-salinity wastewater resources. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The front view of the device for separating salted anaerobic ammonia oxidation granular sludge by hydrocyclone under the driving of hydrostatic pressure provided in the present embodiment;

[0026] Figure 2 The right view of the device for separating salted anaerobic ammonia oxidation granular sludge by hydrocyclone under the driving of hydrostatic pressure provided in the present embodiment;

[0027] In the figure: sludge sedimentation zone I, first salted granular sludge zone II, second salted granular sludge zone III, third salted granular sludge zone IV; water outlet 1, total sludge granule overflow outlet 2, first feed inlet 3, first overflow pipe 4, first discharge outlet 5, second feed inlet 6, second overflow pipe 7, second discharge outlet 8, third feed inlet 9, third overflow pipe 10, third discharge outlet 11, water inlet 12, total salt granule discharge outlet 13, first hydrocyclone 14, second hydrocyclone 15, and third hydrocyclone 16. DETAILED DESCRIPTION

[0028] The application will be further described and explained with reference to the accompanying drawings and specific embodiments. The technical features of each embodiment of the application can be combined accordingly without conflict.

[0029] The embodiment provides a device for driving salted granular sludge by using hydrostatic pressure, as shown in Figure 1 and Figure 2 .

[0030] The device comprises a reactor body and a hydrocyclone assembly. The reactor body comprises, from top to bottom, a sludge precipitation zone I, a first salted granular sludge zone II, a second salted granular sludge zone III and a third salted granular sludge zone IV which are in communication with each other. In the embodiment, the volume ratio of the sludge precipitation zone I, the first salted granular sludge zone II, the second salted granular sludge zone III and the third salted granular sludge zone IV is 0.8:1.0:1.0:1.0.

[0031] The sludge precipitation zone I is provided with a water outlet 1 and a total sludge granule overflow outlet 2 on the side wall. The total sludge granule overflow outlet 2 is provided on the side wall of the sludge precipitation zone I at a distance of 1 / 10-1 / 8 from the bottom, and the vertical distance between the total sludge granule overflow outlet 2 and the water outlet 1 is 2 m.

[0032] The third salted granular sludge zone IV is provided with a water inlet 12 for introducing the high-salt nitrogen-containing wastewater to be treated on the side wall at a distance of 1 / 10-1 / 8 from the bottom of the third salted granular sludge zone IV.

[0033] The hydrocyclone assembly comprises a first hydrocyclone 14, a second hydrocyclone 15 and a third hydrocyclone 16 fixed on the outside of the reactor body. The first hydrocyclone 14 is arranged at the junction of the first salted granular sludge zone II and the second salted granular sludge zone III, the second hydrocyclone 15 is arranged at the junction of the second salted granular sludge zone III and the third salted granular sludge zone IV, and the third hydrocyclone 16 is arranged at the bottom of the third salted granular sludge zone IV. The salted granular sludge in the reactor body is divided into small-diameter salted granular sludge, medium-diameter salted granular sludge and large-diameter salted granular sludge under the action of gravity, and is distributed in the first salted granular sludge zone II, the second salted granular sludge zone III and the third salted granular sludge zone IV respectively. The particle size of the small-diameter salted granular sludge ranges from 0.2 mm to 1 mm, the particle size of the medium-diameter salted granular sludge ranges from 1 mm to 2 mm, and the particle size of the large-diameter salted granular sludge is greater than 2 mm.

[0034] In this embodiment, the diameter of the cylindrical portion of the first hydrocyclone 14 is 95 mm, the height of the cylindrical portion is 143 mm, and the bottom cone angle is 20°. The diameter of the cylindrical portion of the second hydrocyclone 15 is 198 mm, the height of the cylindrical portion is 238 mm, and the bottom cone angle is 20°. The diameter of the cylindrical portion of the third hydrocyclone 16 is 279 mm, the height of the cylindrical portion is 223 mm, and the bottom cone angle is 20°. The separation efficiency of the first hydrocyclone 14 and the second hydrocyclone 15 for salt crystallization and granular sludge can reach more than 98%, and the separation efficiency of the third hydrocyclone 16 can reach more than 95%.

[0035] The side wall of the first salted granular sludge zone II is provided with a first feed inlet 3, and the first feed inlet 3 is in communication with the first hydrocyclone 14. The top of the first hydrocyclone 14 is provided with a first overflow pipe 4, and the bottom is provided with a first discharge outlet 5. In this embodiment, the vertical distance between the first feed inlet 3 and the water outlet 1 is 5 m, and the diameter of the first feed inlet 3 is 24 mm, so that the flow rate of the small particle size salted granular sludge entering the first hydrocyclone 14 is 7.7 m / s. The diameter of the first overflow pipe 4 is 19 mm, and the depth of the first overflow pipe 4 inserted into the first hydrocyclone 14 is 38 mm. The diameter of the first discharge outlet 5 is 9 mm.

[0036] The side wall of the second salted granular sludge zone III is provided with a second feed inlet 6, and the second feed inlet 6 is in communication with the second hydrocyclone 15. The top of the second hydrocyclone 15 is provided with a second overflow pipe 7, and the bottom is provided with a second discharge outlet 8. In this embodiment, the vertical distance between the second feed inlet 6 and the water outlet 1 is 8 m, and the diameter of the second feed inlet 6 is 50 mm, so that the flow rate of the medium particle size salted granular sludge entering the second hydrocyclone 15 is 10.8 m / s. The diameter of the second overflow pipe 7 is 44 mm, and the depth of the second overflow pipe 7 inserted into the second hydrocyclone 15 is 79 mm. The diameter of the second discharge outlet 8 is 20 mm.

[0037] The side wall of the third salted granular sludge zone IV is provided with a third feed inlet 9, and the third feed inlet 9 is in communication with the third hydrocyclone 16. The top of the third hydrocyclone 16 is provided with a third overflow pipe 10, and the bottom is provided with a third discharge outlet 11. In this embodiment, the vertical distance between the third feed inlet 9 and the water outlet 1 is 11 m, and the diameter of the third feed inlet 9 is 70 mm, so that the flow rate of the large particle size salted granular sludge entering the third hydrocyclone 16 is 13.3 m / s. The diameter of the third overflow pipe 10 is 84 mm, and the depth of the third overflow pipe 10 inserted into the third hydrocyclone 16 is 112 mm. The diameter of the third discharge outlet 11 is 28 mm.

[0038] The first overflow pipe 4, the second overflow pipe 7, and the third overflow pipe 10 are respectively in communication with the total sludge particle overflow outlet 2 through pipelines. The first discharge outlet 5, the second discharge outlet 8, and the third discharge outlet 11 are respectively in communication with the total salt particle discharge outlet 13 through pipelines.

[0039] The device for driving the salted granular sludge by using the hydrostatic pressure can be made of PVC plate and steel plate, and the working process is as follows:

[0040] The high-salt nitrogen-containing wastewater (with a salt content of 10-35 g / L) enters the reactor body through the water inlet 12, the inlet flow rate is 1.0-1.5 m / h, and the flow rate is 80-90 m 3 / h. The granular sludge in the reactor body carries out denitrification treatment on the high-salt nitrogen-containing wastewater. After a long time of operation of the reactor, the adsorption and concentration of salt on the functional groups on the surface of the granular sludge will cause salt crystals to be generated on the surface and block the pores, so that the granular sludge is salted. The denitrification efficiency of the salted granular sludge will rapidly decrease.

[0041] In order to treat the salt crystals on the surface of the granular sludge and restore its denitrification capacity, the hydraulic cyclone is combined with the reactor in the embodiment. The centrifugal sedimentation principle of the hydraulic cyclone is used, and the weight difference between the salt crystals and the granular sludge is used to separate the salt crystals from the surface of the granular sludge. However, the height of the anaerobic ammonia oxidation reactor can generally reach 8-15 meters, which is high enough to cause a huge hydrostatic pressure difference in the reactor. Therefore, the hydraulic cyclone is placed at different heights to use the hydrostatic pressure difference to provide the inlet flow rate for the hydraulic cyclone. In the reactor body, the salted granular sludge is divided into small-particle-diameter salted granular sludge, medium-particle-diameter salted granular sludge and large-particle-diameter salted granular sludge under the action of gravity, and is distributed in the first salted granular sludge area II, the second salted granular sludge area III and the third salted granular sludge area IV, respectively. The particle diameter of the small-particle-diameter salted granular sludge in the first salted granular sludge area II ranges from 0.2 mm to 1 mm, the particle diameter of the medium-particle-diameter salted granular sludge in the second salted granular sludge area III ranges from 1 mm to 2 mm, and the particle diameter of the large-particle-diameter salted granular sludge in the third salted granular sludge area IV is greater than 2 mm.

[0042] The small-particle-diameter salted granular sludge enters the first hydraulic cyclone 14 through the first feeding port 3. In the first hydraulic cyclone 14, the granular sludge and the salt crystals in the small-particle-diameter salted granular sludge are separated, the small-particle-diameter granular sludge is discharged through the first overflow pipe 4 at the top and enters the total sludge granule overflow port 2 through the pipeline, and the small-particle-diameter salt crystals are discharged through the first discharge port 5 at the bottom and flow to the total salt granule discharge port 13 through the pipeline.

[0043] The medium-particle-diameter salted granular sludge enters the second hydraulic cyclone 15 through the second feeding port 6. In the second hydraulic cyclone 15, the granular sludge and the salt crystals in the medium-particle-diameter salted granular sludge are separated, the medium-particle-diameter granular sludge is discharged through the second overflow pipe 7 at the top and enters the total sludge granule overflow port 2 through the pipeline, and the medium-particle-diameter salt crystals are discharged through the second discharge port 8 at the bottom and flow to the total salt granule discharge port 13 through the pipeline.

[0044] The large-sized salted granular sludge enters the third hydrocyclone 16 through the third feed port 9. In the third hydrocyclone 16, the granular sludge and salt crystals in the large-sized salted granular sludge are separated, the large-sized granular sludge is discharged through the third overflow pipe 10 at the top and enters the total sludge granule overflow port 2 through the pipe, and the large-sized salt crystals are discharged through the third discharge port 11 at the bottom and flow to the total salt granule discharge port 13 through the pipe.

[0045] The ratio of the inlet flow of the first feed port 3, the inlet flow of the second feed port 6 and the inlet flow of the third feed port 9 is 8.0:5.0:2.0.

[0046] The granular sludge entering the reactor body from the total sludge granule overflow port 2 returns to the first salted granular sludge zone II, the second salted granular sludge zone III and the third salted granular sludge zone IV according to the gravity effect. At this time, the granular sludge restores the denitrification performance, and the reactor continues to carry out the denitrification treatment of the high-salt nitrogen-containing wastewater. The salt crystals flowing to the total salt granule discharge port 13 through the first discharge port 5, the second discharge port 8 and the third discharge port 11 are recycled.

[0047] The above-described embodiments are only a preferred scheme of the present application, and are not intended to limit the present application. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application. Therefore, any technical scheme obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present application.

Claims

1. A device for driving salted granular sludge by using hydrostatic pressure, characterized in that, The device comprises a reactor body and a hydrocyclone assembly; the reactor body is sequentially connected from top to bottom as a sludge precipitation zone (I), a first salted granular sludge zone (II), a second salted granular sludge zone (III) and a third salted granular sludge zone (IV); the sludge precipitation zone (I) is provided with a water outlet (1) and a total sludge granule overflow outlet (2) on the side wall; the third salted granular sludge zone (IV) is provided with a water inlet (12) at the bottom of the side wall for feeding the high-salinity nitrogen-containing wastewater to be treated; The hydrocyclone assembly comprises a first hydrocyclone (14), a second hydrocyclone (15) and a third hydrocyclone (16) fixed on the outside of the reactor body; the first hydrocyclone (14) is arranged at the junction of the first salted granular sludge zone (II) and the second salted granular sludge zone (III), the second hydrocyclone (15) is arranged at the junction of the second salted granular sludge zone (III) and the third salted granular sludge zone (IV), and the third hydrocyclone (16) is arranged at the bottom of the third salted granular sludge zone (IV); The first salted granular sludge zone (II) is provided with a first feeding inlet (3) on the side wall, the first feeding inlet (3) is communicated with the first hydrocyclone (14); the first hydrocyclone (14) is provided with a first overflow pipe (4) at the top and a first discharge outlet (5) at the bottom; the second salted granular sludge zone (III) is provided with a second feeding inlet (6) on the side wall, the second feeding inlet (6) is communicated with the second hydrocyclone (15); the second hydrocyclone (15) is provided with a second overflow pipe (7) at the top and a second discharge outlet (8) at the bottom; the third salted granular sludge zone (IV) is provided with a third feeding inlet (9) on the side wall, the third feeding inlet (9) is communicated with the third hydrocyclone (16); the third hydrocyclone (16) is provided with a third overflow pipe (10) at the top and a third discharge outlet (11) at the bottom; The first overflow pipe (4), the second overflow pipe (7) and the third overflow pipe (10) are respectively communicated with the total sludge granule overflow outlet (2) through pipelines; the first discharge outlet (5), the second discharge outlet (8) and the third discharge outlet (11) are respectively communicated with the total salt granule discharge outlet (13) through pipelines; The vertical distance between the first feeding inlet (3) and the water outlet (1) is 5-6 m, and the diameter of the first feeding inlet (3) is 20-24 mm, so that the flow rate of the small-particle-size salted granular sludge entering the first hydrocyclone (14) is 7.0-8.0 m / s; the vertical distance between the second feeding inlet (6) and the water outlet (1) is 8-9 m, and the diameter of the second feeding inlet (6) is 45-50 mm, so that the flow rate of the medium-particle-size salted granular sludge entering the second hydrocyclone (15) is 10-11.0 m / s; the vertical distance between the third feeding inlet (9) and the water outlet (1) is 11-12 m, and the diameter of the third feeding inlet (9) is 65-70 mm, so that the flow rate of the large-particle-size salted granular sludge entering the third hydrocyclone (16) is 13.0-14.0 m / s; The diameter of the first overflow pipe (4) is 14-19 mm, and the depth of insertion into the first hydrocyclone (14) is 30-38 mm; the diameter of the second overflow pipe (7) is 35-44 mm, and the depth of insertion into the second hydrocyclone (15) is 70-79 mm; the diameter of the third overflow pipe (10) is 80-84 mm, and the depth of insertion into the third hydrocyclone (16) is 100-112 mm.

2. The apparatus for driving the salted granular sludge by using the hydrostatic pressure according to claim 1, wherein, The salted granular sludge in the reactor body is separated into small-particle-size salted granular sludge, medium-particle-size salted granular sludge and large-particle-size salted granular sludge under the action of gravity, and is distributed in the first salted granular sludge zone (II), the second salted granular sludge zone (III) and the third salted granular sludge zone (IV) respectively.

3. The apparatus for driving the salted granular sludge by the hydrostatic pressure according to claim 2, characterized in that, The particle size of the small-particle-size salted granular sludge ranges from 0.2 mm to 1 mm, the particle size of the medium-particle-size salted granular sludge ranges from 1 mm to 2 mm, and the particle size of the large-particle-size salted granular sludge is greater than 2 mm.

4. The apparatus for driving the salted granular sludge by using the hydrostatic pressure according to claim 1, wherein, The volume ratio of the sludge precipitation zone (I), the first salted granular sludge zone (II), the second salted granular sludge zone (III) and the third salted granular sludge zone (IV) is 0.8:1.0:1.0:1.

0.

5. The apparatus for driving the salted granular sludge by the hydrostatic pressure according to claim 1, wherein, The total sludge granule overflow port (2) is arranged on the side wall of the sludge precipitation zone (I) at a distance of 1 / 10-1 / 8 from the bottom, and the vertical distance between the total sludge granule overflow port (2) and the water outlet (1) is 2-3 m.

6. The apparatus for driving the salted granular sludge by the hydrostatic pressure according to claim 1, wherein, The diameter of the first discharge port (5) is 8-10 mm; the diameter of the second discharge port (8) is 18-20 mm; and the diameter of the third discharge port (11) is 25-28 mm.

7. The apparatus for driving the salted granular sludge by the hydrostatic pressure according to claim 1, wherein, The diameter of the cylindrical portion of the first hydrocyclone (14) is 90-95 mm, the height of the cylindrical portion is 135-143 mm, and the bottom angle is 20°; the diameter of the cylindrical portion of the second hydrocyclone (15) is 195-198 mm, the height of the cylindrical portion is 234-238 mm, and the bottom angle is 20°; and the diameter of the cylindrical portion of the third hydrocyclone (16) is 274-279 mm, the height of the cylindrical portion is 220-223 mm, and the bottom angle is 20°.

8. The apparatus for driving the salted granular sludge of the cyclone separation by using the hydrostatic pressure according to claim 1, characterized in that, The water inlet (12) is arranged on the side wall at a distance of 1 / 10-1 / 8 from the bottom of the third salted granular sludge zone (IV).

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