BE1030838A1 - HYDRAULIC SHIELDING DEVICE FOR LOW DENSITY COMPOSITE POWDER BIOCARRIER GRANULES - Google Patents

Abstract

A hydraulic shielding device for low density composite powder biocarrier granules, comprising: feeding pipe system, cylindrical segment, semi-ellipsoidal segment, conical curved segment, overflow pipe system, and passive impeller, wherein the feeding pipe system is connected to the outer wall portion of the cylindrical segment, the cylindrical segment is provided with an upper cover on the top, the lower part is docked with the semi-ellipsoidal segment, and the lower part of the semi-ellipsoidal segment is docked with the conical curved segment. The overflow pipe system is fixed in the middle of the upper cover of the upper part of the cylindrical segment, the overflow pipe system is provided with a lower introduction pipe and an upper pipe, the upper pipe is higher than the upper cover, for connecting with the outer sludge discharge system, the lower introduction pipe is located on the central axis of the cylindrical segment and the semi-ellipsoidal segment, and the outside of the lower introduction pipe is provided with the passive impeller.

Description

HYDRAULIC SHIELDING DEVICE FOR

COMPOSITE POWDER BIO-CARRIAGE GRANULES WITH LOW

DENSITY

Technical part

The present invention relates to the field of wastewater treatment technology, in particular to a hydraulic shielding device for composite powder biocarrier granules with low

Density.

Background technology

Hydraulic spinners are a kind of liquid heterogeneous mixture separation equipment with a wide range of applications, and their basic principle is the separation of liquid-liquid, liquid-solid, liquid-gas and other two-phase or multiphase mixtures with a certain density difference under centrifugation. At present, the main part of the

Equipment generally consists of five parts: feed pipe, cylindrical segment, conical

segment, overflow section and bottom flow pipe. The cyclone separation technology has the

Advantages of high separation efficiency, convenient operation, simple process, compact structure, small plant size, smaller area consumption, easy to realize continuous operation and automatic control. Based on the above advantages, cyclone separation technology was initially only used for

mineral processing and has developed into a variety of applications in chemistry,

Petroleum, powder technology, metal processing, food and water treatment and other

areas at home and abroad. In the field of water treatment,

Hydrocyclones are used in the aspects of carbon release by activated sludge agitation, the separation of fine inorganic sand in sewage treatment plants and the recovery of aerobic granular sludge.

In the process of urban wastewater treatment, diatomaceous earth, zeolite, activated carbon, attapulgite,

Bentonite, perlite, iron carbon powder, volcanic rock, biochar, vermiculite and others

Powder carrier induces the formation of composite powdery biological carrier particles with powder carrier as the core and enveloped by microorganisms with large adhesion force, and the target particle size is distributed in 25-100um, which is compared with the binding force formed by suspended growth microorganisms under the action of mucus and extracellular polymer Weak biological flocs, forming a "double sludge" symbiotic wastewater biochemical treatment microbial system. In order to achieve the double sludge age of the biochemical system and achieve the effect of synchronous nitrogen and phosphorus removal, the composite

Powder biocarrier particles are separated from the biological floc, and the separated composite biological powder carrier particles are recycled, and the biological floc is discharged as the remaining sludge. At present, the most feasible separation scheme is to use the hydrocyclone method, and there are the following technical difficulties in achieving this goal: (1)The equivalent particle size of composite powder biocarrier particles is small, and improving the screening efficiency is one of the main difficulties in using the hydrocyclone method. (2)The density difference between composite powder biocarrier particles and biological floc is small, and the density difference between composite biological powder carrier particles and biological floc is only 0.07-0.15g/cm3, which is less than 0.2g/cm3 in oil-water density, which is the second of the main difficulties in separating the two by hydrocyclone. (3)Different from the current separation of tiny inorganic particles and individual

Materials there is a combination of forces between composite biological

carrier particles and biological flakes, which is not a simple mixture, and it is necessary to separate the composite biological powder carrier particles from the biological flakes during the separation process, and these forces must be overcome, which is the third

Main difficulty in using hydrocyclone is to separate the two.

Content of the invention

The present invention is intended to solve at least one of the technical problems existing in the prior art. Therefore, the present invention proposes a hydraulic

A shielding device for biological carrier particles with low difference composite powder, which improves the shielding efficiency of biological carrier particles with low

Difference composite powder can significantly improve.

A hydraulic screening device for low density powder biocarrier granules according to an embodiment of the present invention, comprising: feed pipe system, cylindrical section, semi-ellipsoid segment, conically curved section,

Overflow pipe system and passive impeller;

wherein the feed pipe system is connected to the outer wall portion of the cylindrical segment and the cylindrical segment is provided with an upper cover at the top, square at the bottom to the semi-ellipsoidal segment and the semi-ellipsoidal segment below the conical

surface segment.

The overflow pipe system is fixed and installed in the middle of the top cover of the upper

Part of the cylindrical segment, the overflow pipe system is provided with a lower

inlet pipe and an upper pipe, the upper pipe is higher than the upper

Cover, for connection to the external sludge discharge system is the lower

Introduction tube on the central axis of the cylindrical segment and the semi-ellipsoidal

segments, and the outside of the lower introduction tube is provided with the passive impeller.

According to some embodiments of the present invention, the feed pipe system comprises a feed pipe, a square rotary pipe and a shrink pipe; [0012] Wherein the feed nozzle is a pipe with a standard circular flange adapted to be connected to the outer

feeding system is used, the circular interface of the outlet end of the feeding nozzle is consistent with the caliber of the round mouth end of the square rotary tube and is docked, the other end of the square rotary tube is a square mouth and its

Cross-sectional area is equal to or smaller than its round mouth end, and the diameter of the square mouth of the shrink tube is equal and not connected, the shrink tube is a rectangular conical tube, and the water crossing section is a gradually shrinking arc-shaped flow channel structure.

According to some embodiments of the present invention, at least the following advantageous effects are provided: 1. The feed pipe system of the present invention adopts a square rotary pipe and a shrink pipe setting. The square rotary pipe setting is convenient for the

Connection between pipes and can simultaneously reduce the resistance loss of the

water inlet section and reduce energy consumption.

Shrink tube adopts a uniformly reduced water cross-section, which is tangentially connected to the straight pipe to accelerate the inlet flow velocity, thereby increasing the tangential swirl velocity, reducing the radial migration force in the

device is increased to promote the separation of the two-phase medium, and the

Separation efficiency of the composite powder biocarrier particles and the biofloc is improved.

2. The conventional hydraulic resolver has mutation points between the cylindrical

Segment and the cone segment or between the two cone segments, which are easily

instability of the liquid flowing through the mutation point, especially for the biological carrier of the composite powder and the biological flake with low

Density difference, the fluid instability leads to the change of force, and some of the separated biological carrier particles from the composite powder are mixed back, and the central

Air column escapes from the overflow port, which leads to a decrease in screening efficiency. The present invention provides a mathematical model of hydraulic screening by the

Calculation of fine intermolecular forces; 3D printing model of internal cavity structure size obtained through the research, the orthogonal experiment of composite powder biocarrier particles and biological flake screening and recovery was verified, and it was found that the turbulent functional area of the present invention uses cylindrical segment and semi-ellipsoid segment structure instead of the traditional cylindrical structure, which can realize that the

Connecting port of the semi-ellipsoidal segment and the conical surface segment is in a continuous state of tangential curvature, ie the inner

Cavity surface of the semi-ellipsoidal segment and the inner cavity surface of the conical surface segment are continuous smooth surfaces, and the liquid flows evenly from the semi-ellipsoidal segment to the conical surface segment under the

Influence of swirl and gravity, the flow state is stable and the

Resistance loss low. 3. The present invention is achieved by setting a passive impeller in the cylindrical and semi-ellipsoidal section, which rotates under the action of the imported mixture, the denser biological composite powder carrier particles are pressed into the outer wall and separation zone of the device under the action of the impeller spin, while the biologically lighter

flake enters the central air column and is discharged through the overflow section, thereby synchronously reducing the short flow, achieving a rectification that

Separation effect of the composite biological powder carrier particles and the biological flocculation is enhanced, the mixing of the separated composite biological carrier particles and the biological flocculation is inhibited and the screening efficiency is improved; Based on the fact that the adhesion force between the microorganisms attached to the

Biocarrier particles of the composite powder are bound is larger than that between the suspended biological flocs, the passive impeller adjustment can control the vortex scale of the swirl center in a small range, the water flow shear force in the

center and meet the separation conditions of the biological composite powder carrier particles and the biological flock particles without affecting the adhesion structure between the

to destroy microorganisms on the surface of the biological carrier particles of the composite powder. 5 According to some embodiments of the present invention, the outer plate of the

Flow channel of the shrink tube is an arc structure, the radius of curvature is Ds/2, the radius of the cylindrical segment is D4/2, the square mouth width of the shrink tube is B1, where Ds/2=D4/2+B1, the end of the outer side plate of the runner is horizontally tangentially docked with the upper end of the cylindrical segment, the inner side plate of the runner of the shrink tube is a straight plate structure, the inner plate of the runner and the semi-ellipsoidal segment arc surface are vertically tangentially connected on the left side, and the runner of the shrink tube The water passage section gradually shrinks from the square inlet at the upper end to the narrow square outlet at the lower end, the pipe height of the shrink tube is Hi, Hi remains unchanged, the connection width at the

Shrink tube is Bi, B: is 0.2-0.25 times Da, the cross-sectional width of the shrink tube is B2 and the B2/H is 0.25-0.45.

According to some embodiments of the present invention, the cylindrical segment is a straight-walled structure, Da is 120-300mm, the height of the cylindrical segment is Li and

Li is 1.0-1.2 times of HI; The inner cavity area of the semi-ellipsoid segment is a

Surface of revolution which, after rotation of the central axis of the semi-ellipsoid segment with the

Edge segment of the semi-ellipsoid segment as busbar circumference of the

semi-ellipsoidal segment by 0.4-0.6°, the upper end of the semi-ellipsoidal segment is vertically docked to the lower end of the cylindrical segment, the lower end of the semi-ellipsoidal segment is docked to the conical surface segment, the diameter of the

StoBes is equal, the diameter of the piston is D1, D1/D4 is 0.4-0.6.

According to some embodiments of the present invention, the edge of the

semi-ellipsoid segment an ellipse-long half-moment, the short half-moment is more than

A1/B1=2-5 elliptic line segment, the upper end of the semi-ellipsoid segment is vertical, the lower end of the semi-ellipsoid segment tangent angle is 6°—15°, the vertical height is Ly, L2 is 120-300mm.

According to some embodiments of the present invention, the conical

Surface segment an inverted elliptical surface, ie a rotating surface of an inner

After rotation of 360° around the central axis of the device, the cavity is connected to the edge of the conically curved surface segment as a busbar around the central axis of the

Device formed, the upper end of the conical surface segment is docked to the semi-ellipsoidal segment, the two connection ports are in a continuous state of tangent curvature, and the layer shrinkage angle of the

connection ports is 61, 61 is 12°-30°; The lower end of the conical curved

surface segment is the lower flow connection, the diameter of the lower

flow outlet is 20-35mm, the contraction angle of the lower flow outlet is 62 and 6 is 4°-10°; the height of the conical surface segment is L3 and L3 is 1000-1500mm.

According to some embodiments of the present invention, the edge of the conical

surface segment is an ellipse-long half-moment, a short half-moment ratio is an elliptic line segment of a2/b2=6-10, and the tangential angle of the upper end of the conical surface segment is 6°—15°.

According to some embodiments of the present invention, the insertion depth of the lower insertion tube is Ho, Hz is 0.4-0.7 times the sum of L1 and La.

According to some embodiments of the present invention, the passive impeller comprises a

Blade arrangement, a fixed disc and a hollow shaft, the hollow shaft set is mounted on the lower

Pipe, the blade assembly includes a sleeve and several blades, all

Blade rings are arranged outside the sleeve, the length direction of the blades is adjusted along the axial direction of the sleeve, and the sleeve is fixed on the hollow shaft by the fixing disk.

According to some embodiments of the present invention, the curvature of the outer

Curve of the blade consistent with the curvature of the semi-ellipsoidal segment, and the vertical

Distance from the lower end of the blade to the inlet of the lower insertion tube is H3 and

Hz is 0.4-0.6 times La.

Additional aspects and advantages of the present invention are set forth in part in the following

description, and some will be apparent from the description which follows, or learned by practice of the invention.

Description of the drawings

Figure 1 is a schematic diagram of the structure of a composite powder

Low density biocarrier particle screening device of an embodiment of the present invention;

Figure 2 is a top-down sectional view of a hydraulic screening device for low density composite powder biocarrier particles of a

Embodiment of the present invention;

Figure 3 is a schematic diagram of the structure of the edge of the semi-ellipsoidal

segments of the present invention;

Figure 4 is a schematic representation of the structure of the conical

Surface segment edge of the present invention;

Figure 5 is a schematic diagram of the passive impeller arrangement;

Figure 6 shows a three-dimensional view of the feed tube;

Figure 7 shows a cross-sectional view of the feed tube.

With symbol number:

Feed pipe system 610; Feed pipe 611; Square rotary nozzle 612;

Shrink tube 613; outer siding 614; inner siding 615; cylindrical segment 620; cylindrical segment shell edge 621; top cover 622; semi-ellipsoidal segment 630;

semi-ellipsoidal segment lateral line 631; connection port 632; conical surface segment 640;

Conical surface segment edge 641; bottom drain 642; overflow pipe system 650; upper part takes over 651; lower introduction pipe 652; passive impeller 660; blade assembly 661;

Hard disk 662; hollow shaft 663.

Specific embodiment

Embodiments of the present invention are described in detail below,

Examples of such embodiments are illustrated in the accompanying drawings, wherein identical or similar designators refer to identical or similar elements or

Show elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are examples and serve only to illustrate the invention and are not to be understood as limiting it.

In the description of the present invention it is to be understood that the involved

Orientation description, such as the orientation or positional relationship of the upper and lower displays, is based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present invention and the

is for convenience of description and is not an indication or implication that the

Device or element referred to must have a particular orientation, must be constructed and operated in a particular orientation and therefore cannot be understood as a limitation of the present invention.

In the description of the present invention, plurality refers to more than two. If there is a description of the first, the second is only used to distinguish the technical

characteristics for the purpose and cannot be understood as having a relative

meaning or implicitly indicates the quantity of the specified technical characteristic or implicitly indicates the order of the specified technical characteristic.

In the description of the present invention, unless expressly qualified otherwise, the terms structure, installation, connection, etc. should be understood in a broad sense, and the person skilled in the art can reasonably understand the specific meaning of the above words in the present invention in combination with the specific content of the technical

Determine solution.

With reference to Figs. 1 to 7, the present invention discloses a granular hydraulic screening device for composite powder biocarriers with low

Density difference comprising: 1 and 2, inlet pipe system 610, cylindrical segment 620, semi-ellipsoid segment 630, conically curved surface segment 640, overflow pipe system 650 and passive impeller 660; The

Feed pipe system 610 is located in the upper part of the device, connected to the outer

Wall portion of the cylindrical segment 620, the upper cover 622 is provided over the cylindrical portion 620, the lower part is docked with the semi-ellipsoid segment 630, and the lower part of the semi-ellipsoid segment 630 is connected to the conically curved

Segment 640 docked. The overflow pipe system 650 is fixedly installed in the middle of the upper cover of the upper part of the cylindrical segment 620, the upper pipe 651 is higher than the upper cover 622, connected to the external sludge discharge system, the lower

Introduction pipe 652 is located in the middle position of the cylindrical segment 620 and the semi-ellipsoidal segment 630, and the outside thereof is provided with a passive impeller 660.

The feed pipe system 610 includes a feed pipe 611, a square rotating pipe 612, and a shrink pipe 613. The feed nozzle 611 is a pipe with a standard round flange connected to the external feed system, the circular interface of the outlet end of the feed nozzle 611 is consistent and docked with the caliber of the round end of the square rotating adapter pipe 612, the other end of the square rotating pipe 612 is a square mouth (ie, B1=H1), and its cross-sectional area is equal to or slightly smaller than its round mouth end, and the diameter of the square mouth of the shrink pipe 613 is consistent and docked. The shrink pipe 613 is a rectangular involute pipe, and the water section is a gradually shrinking arc-shaped flow channel structure.

The outer wall plate 614 of the flow channel of the shrink tube 613 is a

Arc structure, and the radius of curvature Ds/2 is the sum of the radius D4/2 of the cylindrical segment 620 of the device and the square width B1 of the shrink tube 613, that is, Ds/2=D4/2+B1, the end of the arc plate and the straight wall segment are horizontally tangentially connected to the top of the device, and the inner plate of the runner is a straight plate structure vertically tangentially connected to the arc surface of the semi-ellipsoid segment on the left side. The water section of the flow channel gradually shrinks from the square inlet at the upper end to the narrow square outlet at the lower end, the tube height H1 of the shrink tube 613 remains unchanged, Bi is 0.2-0.25 times of the diameter D4 of the cylindrical section 620, the cross-sectional aspect ratio of the

Outlet flow rate is B2/H, generally 0.25-0.45, and the outlet flow rate should be controlled at 3-6 m/s.

The cylindrical segment 620 is a straight wall structure, the diameter Da is

Generally 120-300 mm and the height L1 of the cylindrical segment 620 is 1.0-1.2 times the tube height Hi of the shrink tube 613. The inner cavity area of the semi-ellipsoidal

Segment 630 is a surface of revolution which is formed after rotation of 360° around the central axis of the device with the edge of the semi-ellipsoid segment 631 as a busbar, the upper end of the semi-ellipsoid segment 630 is vertically docked to the lower end of the cylindrical segment 620, the lower part is docked to the conical surface segment 640, the

Diameter of the connection port 632 is the same, the ratio of the lower diameter D1 of the semi-ellipsoidal segment 630 to the diameter Da of the cylindrical segment 620 should be 0.4-0.6.

As shown in Figure 1 and Figure 3, the semi-ellipsoidal segment edge 631 is the elliptic long half moment, the short half moment is more than A1/B1=2-5 The semi-ellipsoidal segment edge 631, the upper end is vertical, the lower end tangential angle is 6°—15°, and the vertical height should be 120-300mm.

The conical surface segment 640 is an inverse elliptical surface, i.e. the edge line 641 of the conical surface segment is used as a busbar to wrap around the

Mandrel axis of the device to rotate 360° to form a surface of revolution with an internal cavity, wherein the upper end of the conical surface segment 640 and the semi-ellipsoidal

Segment 630 are docked, the two connecting openings 632 in a continuous

State of tangent curvature and the shrinkage angle 01 of the connection port 632 should be 12°-30°, The lower end of the conical curved surface segment 640 is the lower flow port 642, the outlet diameter should be 20-35 mm and the outlet shrinkage angle 02 is 4°-10°; The height of the conical curved

Surface segment 640 should be 1000-1500 mm.

As shown in Figures 1 and 4, the edge 641 of the conical surface segment is the long half moment of the ellipse, the short half moment ratio is a2/02=6-10, the edge of the conical surface segment is 641, and the angle between the tangent lines at the upper end is 6°-15°.

In the sieving process, the composite powder biocarrier particles and the biological

Flocculate mixture with a concentration of less than 15 g/L and a density difference of 0.07-0.15 g/cm3 in the biochemical system of wastewater treatment at 3-6 m/s through the

Shrink tube outlet 613 of the feed pipe system 610 into the cylindrical segment 620, and the flow rate of the shrink tube outlet 613 is controlled at 3-6 m/s. The

Mixture entering the cylindrical segment 620 is separated from the biological floc under the action of turbulent and water shear forces.

After the composite powder biocarrier particles are separated from the biofloc, the denser composite powder biocarrier particles are concentrated on the tube wall under the action of vortices and, under the action of gravity, flow along the tube wall into the conically curved section 640. The density of lighter bioflocs is concentrated at the outer edge of the

Air column is enriched and forms a transition zone between the pipe wall and the air column.

Finally, the composite powder biocarrier particles with higher density are

The action of gravity and centrifugal force recovers the organic matter from the lower flow port 642 and returns it to the biochemical system, and the lighter biological

Flocculates and wastewater flakes spiral upwards, exit the overflow pipe system 650 and enter the sludge discharge system.

It should be noted that the hydraulic shielding device of composite

Low density powder biocarrier particles of the present invention for screening

Recovery of mixed liquid containing composite powder

biocarrier particles and a biological floc concentration of less than 15 g/L. If the concentration is higher than 15 g/L, the crowding effect of composite powder-biocarrier particles and bioflocs in the cylindrical segment 620 and the semi-ellipsoidal segment 630 is significantly increased, resulting in unsatisfactory

Separation of composite powder-biocarrier particles from bioflakes.

Using the hydraulic shielding device for composite powder

Low density biocarrier granules can be produced during use according to the physical and chemical properties of the biochemical composite powder carrier and biological flake and the turbulence and centrifugal force difference occurring during

Sieve recovery process required, the diameter and length of the cylindrical segment 620, the semi-ellipsoid segment 630, the diameter and length of the conical curved segment 640, the shrinkage ratio of the feed pipe system 610 and the insertion depth of the lower insertion pipe 652 of the overflow pipe system 650 are adjusted and adjusted to realize the composite powder biological carrier particles The screening efficiency reaches 80%-90%, as shown in Table 1:

Table 1 of the present invention of low density difference composite powder biocarrier

Granule hydraulic shielding device functional partition and lumen structure

Comparison table of hydraulic screen screening efficiency outside the optimized size and the size of the inner cavity structure

Below the

Screening efficiency in Equivalent to Above the

Downline- Corresponds

Size range of the upper limit

Area of a

Low concentration separation according to 2, screening performance of the optimized LL ; ; unit ; ; == optimized = ; screening performance

Ze

Sieve device inner ; lower for the inner d

Cavity structures boundary area Cavity structures

Cavity structure upper limit r s r [ | mines | [PP I= Jan = mm 120-300 <120 >300 8 segment diameter 66.5% 66.7% = shrink tube outlet / 0.25-0.45 <0.25 0.45> = 723% 73,6% ë |s 2 / 120-300 <120 >300 £ ellipsoidal segment 65.2% 69.9%

The ratio of the lower diameter of the semiellipsoid 68.2%- 53.4%- / 0.4-0.6 <04 >06

Segments to 74.7% 64.8%

Diameter of the cylindrical segment

The ratio of the 80%-90% lower insertion tube height to the total height 523% 644% / 0.4-0.7 <04 >07 cylindrical and 62.5% 72% semiellipsoidal

Segments

Hi The height of the conical 59.2% 624%

Ë Bottom nozzle diameter 48.2%" 58.8%- à [eme | [8 on (ee | Les 2 Shrinkage angle 6: 12-30 <12 61.8%-74.6 >30 ë 66.6% [ee | [e= len

Shrinkage angle 8: 4-10 <4 >10 66.8% 724%

From the above table, it can be seen that the hydraulic shielding device of composite powder biocarrier particles of the present invention can separate the composite powder biocarrier particles from the biological flake with a density difference of only 0.07-0.15 g/cm3, and the shielding efficiency of the composite biological powder carrier particles can reach 80%-90%. The sieved

Biocarrier particles made of composite powder are returned to the septic tank, which

Stability of the biocarrier content of the composite powder in the wastewater treatment process can be realized and the dosage of the powder biocarrier can be reduced, which has significant economic value.

It should be explained that the cone section of the traditional hydraulic resolver adopts a straight double cone design, and there are mutation points between the two cones.

When the pressurized fluid flows through the cone section, it is subjected to a reaction force perpendicular to the direction of the wall of the cone segment, and the reaction force pushes the material obliquely upward toward the air column. Among them, the bioflakes with lower density migrate into the air column, and the biocarrier particles of the composite powder with higher density migrate downward under the action of centrifugal force and gravity.

There are mutation points in the double cone segment, which leads to instability of the

liquid flow state, the direction of the liquid force changes, and the force of light materials in the small cone section tends to be horizontal, which is not enough to balance the gravity effect and will escape to the lower flow outlet 642, resulting in a decrease in separation efficiency. In addition, the presence of

Mutation points lead to increased head loss and increased energy consumption of the

Liquid. By using the semi-ellipsoid segment 630 to replace the traditional cylindrical structure, the semi-ellipsoid segment 630 and the conical

Surface segment 640 connection port 632 in a tangential and continuous

Curvature state, ie the inner cavity surface of the semi-ellipsoidal segment 630 and the conical surface segment 640 inner cavity surface are continuously smooth

surfaces, and the liquid flows evenly from the semi-ellipsoidal segment to the conical

Surface segment under centrifugal force and gravity, the flow state is stable and the head loss is small.

Table 2 The influence of the concentration of separated materials on the screening performance with unchanged inlet flow rate

Shielding efficiency (% '

From Table 2 it can be seen that under the condition that the inlet flow rate remains unchanged, the lower the concentration of the separated material, the better the

Separation effect, as the concentration increases, the "crowding effect" gradually increases, and the composite powder biocarrier particles and the biological flake particles are not completely separated and escape directly through the overflow pipe system 650, resulting in

decrease in screening efficiency, especially when the material concentration exceeds 15 g/L.

With reference to Figure 1, Figure 2 and 5, further comprising a passive

Impeller 660, a passive impeller 660 arranged in the cylindrical segment 620 and the semi-ellipsoidal segment 630, the passive impeller 660 comprises a blade assembly 661, a fixed disk 662 and a hollow shaft 663, a hollow shaft 663 rotary assembly at the lower

Introducing pipe 652 of the overflow pipe system 650, the blade assembly 661 comprises a sleeve and a plurality of knives, a plurality of blade rings are provided outside the sleeve, the blades are arranged along the axial direction of the sleeve, the sleeve is fixed on the hollow shaft 663 by the fixed disk 662, and the curvature of the outer curve of the blade is consistent with the curvature of the semi-ellipsoid segment, and the height Hs of the blade located below the mouth of the overflow pipe should be 0.4-0.6 times the height L2 of the

semi-ellipsoid segment 630.

The present invention by providing a passive impeller 660 in the cylindrical

Segment 620 and a semi-ellipsoidal segment 630, the passive impeller 660 rotates under the action of the inlet mixture, the dense composite powder biocarrier particles are pressed into the separation zone under the action of the impeller spin, and the biologically lighter flake enters the central air column and is expelled from the upper part of the

overflow pipe guide 651, thereby reducing the short flow of the cylindrical segment 620 and the semi-ellipsoidal segment 630, achieving the rectification effect and the

Separation effect of composite powder biocarrier particles and biological flakes is enhanced, Remixing of separated composite powder carrier particles with biological flakes was inhibited and the screening efficiency was improved. At the same time, the adjustment of the passive impeller 660 can adjust the vortex scale of the center of the semi-ellipsoidal

Segment 630 in a small area, reduce the water flow shear force in the middle, so that it can meet the separation of the composite powder biological carrier particles and the biological flake particles without damaging the adhesion structure between the

Microorganisms on the surface of the composite powder biological carrier particles. It is understood that in the present embodiment, the passive impeller 660 consists of a blade assembly 661, a fixed disk 662 and a hollow shaft 663, which

Hollow shaft 663 is rotated and installed on the lower introduction pipe 652 of the overflow pipe system 650 and the blade assembly 661 is fixed to the hollow shaft 663 through the fixing disk 662. By adjusting the passive impeller, the sieving efficiency of composite powder-biocarrier particles can be increased to more than 95%.

In particular, as the wastewater flows from the feed pipe system 610 into the cylindrical section 620, the water flow will urge the impeller to rotate, and as the material flows through the passive impeller 660, the denser composite powder biocarrier particles migrate under the

Effect of self-rotation to the side wall, and the materials with lighter density migrate to the central area, thereby enhancing the separation of composite powder biocarrier particles and biological flake particles; The blades of the passive impeller 660 are enclosed in a conical shape, which facilitates the enrichment of dense composite powder

biocarrier particles, improve separation efficiency and reduce energy consumption. In addition, the adjustment of the passive impeller 660 can adjust the vortex scale of the

Center of the semi-ellipsoidal segment 630 in a small area, the

Reduce the velocity gradient of the liquid in the middle and thereby

Reduce water flow shear effect in the middle, so that it facilitates the separation of composite

powder biocarrier particles and biological flock particles without the

adhesion structure between microorganisms on the surface of the composite biological carrier particles.

It should be explained that the introduction pipe 652 in the lower part of the overflow pipe system is too short to cause a short flow effect; too long will cause the

Energy consumption of the mixture in the cylindrical section 620 is too large, the kinetic

Energy of the kinetic separation energy in the later stage is not sufficient and the separation efficiency decreases. Both cause the composite powder and biocarrier particles from the

overflow pipe 650. Therefore, the lower inlet pipe 652 should be at height H2 of the

overflow pipe system 650 shall be 0.4-0.7 times the sum of the cylindrical section 620 height L1 and the semi-ellipsoidal section 630 height L.

The present embodiment drives by placing a passive impeller 660 under the

Impulse of the inlet material jet of the supply pipe system 610 causes the blade assembly 661 to rotate regularly, under the action of the blade impact, the composite biological carrier granule material is enriched on the outer edge wall of the blade, thereby reducing the loss from the overflow section, while the

Short flow is reduced and screening efficiency is improved.

The embodiments of the present invention are described in conjunction with the accompanying

Drawings described in detail, but the present invention is not limited to the above

embodiments, and various changes may be made within the knowledge of those skilled in the art without departing from the scope of the present

invention.

Claims (10)

Patent claims 1. Hydraulic shielding device for low density composite powder biocarrier granules, comprising: feeding pipe system, cylindrical segment, semi-ellipsoidal segment, conical curved segment, overflow pipe system and passive impeller; wherein the feeding pipe system is connected to the outer wall portion of the cylindrical segment, the cylindrical segment is provided with an upper cover on the top, the lower part is docked with the semi-ellipsoidal segment, and the lower part of the semi-ellipsoidal segment is docked with the conical curved segment; the overflow pipe system is fixed in the middle of the upper cover of the upper part of the cylindrical segment, the overflow pipe system is provided with a lower introduction pipe and an upper pipe, the upper pipe is higher than the upper cover, for connecting with the outer sludge discharge system, the lower introduction pipe is located on the central axis of the cylindrical segment and the semi-ellipsoidal segment, and the outside of the lower introduction pipe is provided with the passive impeller. 2. The hydraulic shielding device for low-density composite powder biocarrier granules according to claim 1, wherein: the feed pipe system includes a feed pipe, a square rotating pipe, and a shrink pipe; wherein the feed nozzle is a pipe with a standard circular flange used for connection with the external feed system, the circular interface of the outlet end of the feed pipe is consistent with and docked with the caliber of the round end of the square rotating pipe, the other end of the square rotating pipe is a square mouth, and its cross-sectional area is equal to or smaller than its round mouth end, which is consistent with and docked with the diameter of the square mouth of the shrink pipe, the shrink pipe is a rectangular gradual shrink pipe, and the water crossing section is a gradually shrinking arc-shaped flow channel structure. 3. Hydraulic shielding device for low density composite powder biocarrier granules according to claim 2, wherein: the outer plate of the flow channel of the shrink tube is an arc structure, its radius of curvature is Ds/2, the radius of the cylindrical segment is D4/2, the square mouth width of the shrink tube is B1, where Ds/2=D4/2+B1, the end of the outer side plate of the runner is horizontally tangentially docked with the upper end of the cylindrical segment, the inner plate of the runner tube is a straight plate structure, the inner plate of the runner tube is vertically tangentially connected with the left side of the semi-ellipsoidal segment arc surface, the water passage section of the flow channel of the shrink tube gradually narrows from the square inlet at the upper end to the narrow square outlet at the lower end, the tube height of the shrink tube is Hı, Hı remains unchanged, B1 is 0.2-0.25 times Da, the Cross-sectional width of the shrink tube is B2 and the B2/H1 is 0.25-0.45. 4. The hydraulic shielding device for low density composite powder biocarrier granules according to claim 3, wherein: the cylindrical segment is a straight wall structure, Da is 120-300mm, the height of the cylindrical segment is Li, and Li is 1.0-1.2 times H1; the inner cavity surface of the semi-ellipsoid segment is a surface of revolution formed after the central axis of the semi-ellipsoid segment is rotated 360° with the edge segment of the semi-ellipsoid segment as the busbar circumference of the semi-ellipsoid segment, the upper end of the semi-ellipsoid segment is vertically docked with the lower end of the cylindrical segment, the lower end of the semi-ellipsoid segment is docked with the conical surface segment, the diameter of the plunger is equal to the diameter of the piston is Di, D1/D4 is 0.4 0.6. 5. The hydraulic shielding device for low density composite powder biocarrier granules according to claim 4, wherein: the edge of the semi-ellipsoidal segment is elliptical long half moment, short half moment as a1/b1=2-5 elliptical line segment, the upper end of the semi-ellipsoidal segment is vertical, the lower end of the semi-ellipsoidal segment tangential angle is 6°—15°, the vertical height is L> and L is 120-300mm. 6. The hydraulic shielding device for low density composite powder biocarrier granules according to claim 1, wherein: the conical surface segment is an inverted elliptical surface, that is, a rotating surface with an internal cavity formed after rotating 360° around the central axis of the device with the edge of the conical surface segment as a busbar, the upper end of the conical surface segment is docked with the semi-ellipsoidal segment, and the two joints are in a continuous state of tangent curvature, and the layer shrinkage angle of the connection port is 81, 81 is 12°-30°; The lower end of the conical curved surface segment is the lower flow port, the diameter of the lower flow outlet is 20-35mm, the contraction angle of the lower flow outlet is 02, and 62 is 4°-10°; The height of the conical surface segment is L3 and L3 is 1000-1500mm. 7. The hydraulic shielding device for low density composite powder biocarrier granules according to claim 6, wherein: the edge of the conical surface segment is an elliptical long half moment, the short half moment ratio is an elliptical line segment with a ratio of a2/b2=6-10, and the tangential angle of the upper end of the conical surface segment is 6°-15°. 8. A hydraulic shielding device for low density composite powder biocarrier granules according to claim 1, wherein: the insertion depth of the lower insertion pipe is H> and Hb is 0.4-0.7 times the sum of L1 and La. 9. The hydraulic shielding device for low density composite powder biocarrier granules according to claim 1, wherein: the passive impeller includes a blade assembly, a fixed disk and a hollow shaft, the hollow shaft set is inserted onto the lower part of the pipe, the blade assembly includes a sleeve and a plurality of blades, all the blade rings are arranged outside the sleeve, the length direction of the blades is adjusted along the axial direction of the sleeve, and the sleeve is fixed on the hollow shaft by the fixing disk. 10. A hydraulic shielding device for low density composite powder biocarrier granules according to claim 9, wherein: the curvature of the outer curve of the blade is consistent with the curvature of the semi-ellipsoidal segment, and the vertical distance from the lower end of the blade to the inlet of the lower introduction pipe is H3 and Hz is 0.4-0.6 times L».