CN106396331A - A sludge concentration-dehydration-drying integrated treatment plant and a treating method thereof - Google Patents

Abstract

The invention discloses a sludge concentration, dehydration and drying integrated treatment device and a treatment method thereof, comprising a sludge concentration device and a sludge deep dehydration device; the sludge concentration device includes a wedge-shaped filter screen and a rotating first screw shaft, wedge-shaped The filter screen includes a low-concentration sewage filtration section, a sludge thickening section and a sludge extrusion section; the first screw shaft includes a central shaft, a first rubber ring and a first screw blade, and the sludge deep dehydration device includes a screw conveying and extrusion integrated Machine and extrusion dehydration chamber, screw conveying and extrusion integrated machine includes the second screw blade, conveying shell and second screw shaft with variable pitch, extrusion dehydration chamber includes left filter plate, right filter plate and middle filter plate, left The filter plate and the right filter plate take the middle filter plate as an axis, expand outwards or close inwards. The invention solves the problems of high moisture content and high operating cost in the prior art after sludge treatment.

Description

A sludge concentration, dehydration and drying integrated treatment device and treatment method thereof

technical field

The invention relates to the field of sludge concentration and dehydration and drying, in particular to an integrated treatment device for urban domestic sludge or sludge concentration, dehydration and drying of farms and septic tanks and a treatment method thereof.

Background technique

At present, in the process of sewage treatment, a by-product——sludge will be produced. Sludge is a solid sediment produced by water and sewage treatment. Sludge dehydration is to concentrate or digest sludge to remove water and convert it into A sludge treatment method of semi-solid or solid sludge. Energy conservation and emission reduction is one of the basic national policies for the sustainable development of my country's economy. With the strengthening of water environment governance and protection, the treatment technology of sludge dewatering is also developing continuously.

The existing urban domestic sludge or sludge concentration and dehydration equipment for farms and septic tanks generally include plate and frame filters, stacked screw filters, disc sludge dewaterers, belt dewaterers, etc. , generally have the following defects: 1) The water content after dehydration is too high, and the water content after general treatment is as high as 70-80%, which cannot meet the water content requirements of terminal treatment such as landfill or incineration of dewatered sludge; 2) Equipment The manufacturing cost or the operating cost per unit of processing capacity is too high; 3) The equipment covers an excessively large area and space.

Therefore, the inventor conducted further research on this, and developed a sludge concentration, dehydration and drying integrated treatment device and treatment method thereof, and this case arose from this.

Contents of the invention

The technical problem to be solved by the present invention is to provide an integrated treatment device for sludge concentration, dehydration and drying and its treatment method, so as to solve the problems of high moisture content and high operating cost in the prior art after sludge treatment.

For solving the problems of the technologies described above, the technical solution of the present invention is:

An integrated treatment device for sludge concentration, dehydration and drying, including a sludge concentration device and a sludge deep dehydration device, and the sludge concentration device is connected to the sludge deep dewatering device;

The sludge thickening device includes a wedge-shaped filter screen and a rotating first screw shaft, and the wedge-shaped filter screen includes a low-concentration sewage filtering section, a sludge thickening section and a sludge extrusion section; a low-concentration sewage filtering section, a sludge thickening section The first screw shaft with variable pitch and variable diameter includes a central shaft, a first rubber ring and a first screw blade, the first screw blade is installed on the central shaft, and the first rubber ring surrounds the Between the first helical blade and the wedge-shaped filter screen;

The sludge deep dewatering device includes a screw conveying and extruding integrated machine and an extruding dewatering chamber, and the screw conveying and extruding integrated machine includes a second helical blade, a conveying shell and a second screw shaft with variable pitch. The spiral blade is installed on the second screw shaft, and the extruding dehydration chamber includes a left filter plate, a right filter plate and a middle filter plate, and the left filter plate and the right filter plate take the middle filter plate as the axis and open outward or inward closure.

Further, the sludge thickening device also includes a feed inlet, a discharge outlet and a screw shaft driving device, and the discharge outlet includes a discharge pressure plate, a compression spring, a limit sleeve and a limit adjustment bolt.

Further, the sludge deep dewatering device also includes a driving device and a feed hopper connected to the sludge thickening device, the feeding hopper is connected to the conveying housing, and the driving device is connected to the second screw shaft through a bearing seat. The housing consists of a pair of tapered roller bearings mounted back to back.

Further, the middle filter plate is composed of filter cloth, middle wedge-shaped filter screen, filter plate body, filtrate outlet and compressed air inlet, and the filter cloth, middle wedge-shaped filter screen and filter plate body form a hollow cavity.

Further, the left filter plate is composed of left filter cloth, left wedge-shaped filter screen, left outer sealing plate and left liquid outlet, and the left filter cloth, left wedge-shaped filter screen and left outer sealing plate form a sealed left filtrate cavity; the right filter plate It is composed of right filter cloth, right wedge-shaped filter screen, right outer sealing plate and right liquid outlet, and the right filter cloth, right wedge-shaped filter screen and right outer sealing plate form a sealed right filtrate chamber.

Further, the extrusion dehydration chamber also includes an opening device, which is composed of an opening oil cylinder or cylinder, a left connecting rod, a right connecting rod, and a hinge seat. The left connecting rod and the right connecting rod are respectively hinged with the left filter plate and the right filter plate. When the piston rod of the open oil cylinder or air cylinder is stretched out, the left filter plate and the right filter plate are closed, and when the piston rod of the open oil cylinder or air cylinder is retracted, the left filter plate and the right filter plate are opened to discharge materials.

Further, the extrusion dehydration chamber also includes a locking device, which is composed of a locking oil cylinder or cylinder and a locking pin. The left filter plate is provided with a left locking ear plate hole, and the right filter plate is provided with a right locking ear plate. When the piston rod of the locking oil cylinder or cylinder is extended or retracted, the locking pin is driven to insert or withdraw from the hole of the left locking lug plate and the hole of the right locking lug plate, so that the left filter plate and the right filter plate are closed or opened .

An integrated treatment method for sludge concentration, dehydration and drying, comprising the following steps:

Step 1: Primary concentration and dehydration: transport the sludge to be treated to the sludge concentration device, and initially squeeze the sludge through the first screw shaft of the sludge concentration device and drive the sludge to the wedge-shaped filter screen, and the sludge Sequentially filter out most of the free water through the low-concentration sewage filter section, filter out the remaining free water in the sludge thickening section, and filter out part of the internal water in the sludge extrusion section to separate sludge particles from water;

Step 2: Two-level deep dehydration and drying: the sludge that has been treated by the first-level concentration and dehydration is transported to the sludge deep dehydration device, and then conveyed and extruded to the extrusion dehydration chamber through the screw conveying and extrusion machine. In the pressure dehydration chamber, when the left filter plate and the right filter plate are closed, the compressed air blows off the adsorbed water on the surface of the sludge particles to dry the sludge and discharge the filtrate at the same time. When the left filter plate and the right filter plate are opened outward, The sludge that meets the moisture content requirements can be obtained.

Further, in step one: the rotation speed of the first screw shaft is controlled at 1.5-3.5r/min;

Further, in step 2: the start-up speed of the second screw shaft of the screw conveying and extrusion machine is 7r/min, and when the extrusion dehydration chamber is filled with sludge, dehydration begins; as the pressure increases, the second screw shaft The rotation speed of the filter gradually decreases. When the rotation speed decreases to 1.5r/min, the middle filter plate is fed with compressed air, and the compressed air blows off the adsorbed water on the surface of the sludge particles; the pressure of the compressed air is 0.7-1Mpa.

After adopting the above scheme, the present invention continuously conveys the sludge to the wedge-shaped filter screen through the first screw shaft of the sludge thickening device for segmental filtration, controls the accuracy of filtration, and then passes through the screw conveying and extrusion of the sludge deep dehydration device. The machine is screw extruded and conveyed, and the sludge is extruded and deeply dehydrated in the extrusion dehydration chamber. The present invention has the following advantages:

1. The sludge thickening device realizes a segmented filtration design with different pressures and different filtration precisions, so that the filtration precision of the sludge of the present invention can be well controlled, and most of its free water can be removed, so that the sludge with high water content Sewage or sludge is concentrated into sludge with a water content of 80-85%. The screw extrusion, compressed air extrusion, and compressed air blow-off in the sludge deep dehydration device make the surface water and internal combination of sludge particles Water is removed and dried into sludge with a moisture content of less than 50%, which has a good dehydration effect, so as to meet the moisture content requirements required for terminal treatment such as landfills and incineration stations;

2. The sludge thickening device and the deep sludge dewatering device of the present invention are simple in structure, can operate continuously, and have a large processing capacity, and the operating cost of equipment manufacturing or unit processing capacity is lower than that of the prior art;

3. The present invention adopts fully mechanized processing with low rotating speed, so its manufacturing cost is low, its operation noise is low and its service life is long, and the device used in it has a compact structure and a small footprint and space.

Description of drawings

Fig. 1 is the structural representation of the sludge thickening device of the present invention;

Fig. 2 is the structural representation of the deep sludge dewatering device of the present invention;

Fig. 3 is a sectional view when the left filter plate and the right filter plate are closed in the direction A-A of Fig. 2;

Fig. 4 is the right side view of Fig. 2 when the left filter plate and the right filter plate are closed;

Fig. 5 is the right side view of Fig. 2 when the left filter plate and the right filter plate are opened;

Fig. 6 is the front view of the intermediate filter plate of the present invention;

Fig. 7 is a left view of Fig. 6;

Fig. 8 is a partial enlarged view of the intermediate filter plate of the present invention.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. The present invention discloses an integrated treatment device for sludge concentration, dehydration and drying, as shown in Figure 1 and Figure 2, an integrated treatment device for sludge concentration, dehydration and drying, including a sludge concentration device 1 and a sludge The deep dewatering device 2 and the sludge thickening device 1 are connected to the sludge deep dewatering device 2 .

The sludge thickening device 1 includes a wedge-shaped filter screen 11 and a rotating first screw shaft 12, and the wedge-shaped filter screen 11 includes a low-concentration sewage filter section 111, a sludge thickening section 112 and a sludge extruding section 113; Sewage filtering section 111, sludge thickening section 112 and sludge extruding section 113 are connected sequentially. Low-concentration sewage filtering section 111, sludge thickening section 112 and sludge extruding section 113 are based on the sludge thickening device during the filtration process. Different pressure settings have different filtration accuracy. In this embodiment, the filter screen aperture of the low-concentration sewage filter section 111 is 0.5mm, the filter screen aperture of the sludge thickening section 112 is 0.3mm, and the sludge extrusion section 113 The pore size of the filter screen is 0.1mm.

The first screw shaft 12 is a shaft with variable pitch and diameter. The purpose is to adapt to the volume reduction after the sludge is thickened and to maintain sufficient squeezing force between the first screw shaft 12 and the wedge-shaped filter screen 11 .

The first screw shaft 12 includes a central shaft 121, a first rubber ring 122 and a first screw blade 123, the first screw blade 123 is installed on the central shaft 121, and the first rubber ring 122 surrounds the first screw blade 123 and the wedge-shaped filter screen 11, it can not only seal the space between the two first helical blades 123, reduce the backflow of sewage, improve the working efficiency of the sludge thickening device, but also reduce the direct contact between the first helical blade 123 and the wedge-shaped filter screen 11. Wear and tear, improve the service life of the sludge thickening device.

The sludge deep dewatering device 2 includes a screw conveying and extruding integrated machine 21 and an extruding dewatering chamber 22. The screw conveying and extruding integrated machine 21 is connected to the extruding dewatering chamber 22. The screw conveying and extruding integrated machine 21 includes The second helical blade 214 , the conveying casing 212 , and the second helical shaft 211 with variable pitch. The purpose of the second screw shaft 211 being set at a variable pitch is to discharge the air in the sludge so that the sludge entering the dehydration chamber can generate sufficient squeezing force.

The extrusion dehydration chamber 22 includes a left filter plate 221, a right filter plate 222 and a middle filter plate 223. The left filter plate 221 and the right filter plate 222 can be opened outward or closed inward with the middle filter plate 223 as the axis.

Further, the sludge thickening device 1 also includes a feed port 13, a discharge port 14 and a screw shaft drive device 15, and the discharge port 14 includes a discharge platen 141, a compression spring 142, a limit sleeve 143 and a position limiter. Adjustment bolt 144. The discharge port 14 is provided with a compression spring 142, a limit sleeve 143 and a limit adjusting bolt 144 to adjust the pressure of the sludge thickening device to adapt to different types of sludge.

Further, the sludge deep dewatering device 2 also includes a drive device 24 and a feed hopper 23 connected to the sludge thickening device 1, the feed hopper 23 is connected to the conveying housing 212, and the drive device 24 is connected to the second screw shaft 211. The bearing housing 25 is connected between them, and the bearing housing 25 includes a pair of tapered roller bearings 251 and 252 installed back to back. The second screw shaft 211 is installed in a cantilever type, and the bending moment and axial force generated by the second screw shaft 211 during operation are borne by a pair of tapered roller bearings 251 and 252 installed back to back.

Further, the first helical blade 123 has a flexible scraper. The flexible scraper on the first helical blade 123 rotates synchronously, and the flexible scraper is in direct contact with the wedge-shaped filter screen 11 to scrape off the sludge particles deposited on the wedge-shaped filter screen 11 to speed up the filtration.

Further, as shown in Figure 6, Figure 7 and Figure 8, the middle filter plate 223 is made up of filter cloth 2231, middle wedge-shaped filter screen 2232, filter plate body 2233, filtrate outlet 2234 and compressed air inlet 2235, filter cloth 2231, middle wedge-shaped The filter screen 2232 and the filter plate body 2233 form a hollow cavity 2236 . The filter cloth 2231 acts as a filter, and the wedge-shaped filter screen 2232 in the middle acts as a filter skeleton. When a extrusion cycle ends, the compressed air enters the hollow cavity 2236 through the compressed air inlet 2235, so that the filter cloth 2231 is opened outwards and further compressed. At the same time, the compressed air passes through the filter cloth 2231 to pass through the sludge and blow off the water adsorbed on the surface of the sludge particles, thereby drying the sludge.

Further, as shown in Figure 3, Figure 4 and Figure 5, the left filter plate 221 is made up of left filter cloth 2211, left wedge-shaped filter screen 2212, left outer sealing plate 2213 and left liquid outlet 2215, left filter cloth 2211, left wedge-shaped The filter screen 2212 and the left outer sealing plate 2213 form a sealed left filtrate cavity 2214 . The right filter plate 223 is symmetrical to the left filter plate 221. The right filter plate 223 is composed of a right filter cloth 2231, a right wedge-shaped filter screen 2232, a right outer sealing plate 2233 and a right liquid outlet 2235. The right filter cloth 2231 and the right wedge-shaped filter screen 2232 and the right outer sealing plate 2233 form a sealed right filtrate chamber 2234.

Further, the extrusion dehydration chamber 22 also includes an opening device 224, the opening device 224 is composed of an opening cylinder (or air cylinder) 2241, a left connecting rod 2242, a right connecting rod 2243, and a hinge seat 2244, and the left connecting rod 2242 is hinged to the left filter plate 221 , the right connecting rod 2243 is hinged with the right filter plate 223, when the piston rod of the open oil cylinder (or cylinder) 2241 stretches out, the left filter plate 221 and the right filter plate 223 are closed, and when the piston rod of the open oil cylinder (or cylinder) 2241 shrinks When turning back, the left filter plate 221 and the right filter plate 223 are outwardly opened to discharge.

Further, the extrusion dehydration chamber 22 also includes a locking device 225, the locking device 225 is composed of a locking oil cylinder (or cylinder) 2251 and a locking pin 2252, the left filter plate 221 is provided with a left locking lug hole 2215, and the right The filter plate 223 is provided with a right locking lug hole 2235. When the piston rod of the locking oil cylinder (or air cylinder) 2251 is extended or retracted, the locking pin 2252 is driven to insert or withdraw from the left locking lug hole 2215 and the right locking pin. The lug hole 2235 makes the left filter plate 221 and the right filter plate 223 close or open.

An integrated treatment method for sludge concentration, dehydration and drying, comprising the following steps:

Step 1: Primary concentration, dehydration, and drying: transport the sludge to be treated to the sludge thickening device 1, and initially squeeze the sludge through the first screw shaft 12 of the sludge thickening device 1 and drive the sludge to the The wedge-shaped filter screen 11, the sludge passes through the low-concentration sewage filter section 111 to filter out most of the free water, the sludge thickening section 112 to filter out the remaining free water, and the sludge extrusion section 113 to filter out part of the internal water, and the sludge particles and water separation;

Step 2: Two-level concentration dehydration and drying: the sludge that has undergone the first-level concentration dehydration and drying treatment is transported to the sludge deep dehydration device 2, and then conveyed and extruded by the integrated screw conveying and extrusion machine 21 to extrusion Dehydration chamber 22, in the squeezing dehydration chamber 22, when the left filter plate 221 and the right filter plate 223 are closed, the compressed air blows off the adsorbed water on the surface of the sludge particles, makes the sludge dry, and discharges the filtrate at the same time. When the plate 221 and the right filter plate 223 are opened outwards, sludge meeting the water content requirement can be obtained.

Further, in step one: the rotation speed of the first screw shaft 12 is controlled at 1.5-3.5r/min;

Further, in step 2: the starting speed of the second screw shaft 211 of the screw conveying and extruding integrated machine 21 is 7r/min, and when the extruding and dewatering chamber 2 is filled with sludge, dehydration begins; as the pressure increases, the second The rotation speed of the two screw shafts 211 gradually decreases. When the rotation speed decreases to 1.5r/min, the intermediate filter plate 223 is fed with compressed air, and the compressed air blows off the surface adsorbed water of the sludge particles; the pressure of the compressed air is 0.7-1MPa.

The device is equipped with two-stage concentration and dehydration and drying devices. Low-concentration sewage or sludge first passes through the first-stage concentration and dehydration device for filtration, concentration, and extrusion to remove most of its free water, which can make high-moisture sewage Or the sludge is concentrated into sludge with a water content of 80-85%; the concentrated sludge is subjected to the screw extrusion, compressed air extrusion, and compressed air blow-off of the second-stage dehydration and drying device to make the sludge particles Surface water and internal bound water are removed, and dried into sludge with a moisture content of less than 50%, which meets the moisture content requirements required for terminal treatment such as landfills and incineration stations.

The above is only a preferred embodiment of the present invention, and does not limit the technical scope of the present invention in any way, so any changes or modifications made according to the claims of the present invention and the description should all be covered by the patent of the present invention. within range.

Claims (10)

1. a kind of sludge concentration and dewatering desiccation integral processing meanss it is characterised in that：Including sludge concentration device and sludge deep dehydrator；Sludge concentration device connects sludge deep dehydrator, and described sludge concentration device includes wedge shape filter screen and the first helical axis of rotation, and described wedge shape filter screen includes sewage of low concentration fillter section, sludge condensation section and mud extruded segment；Sewage of low concentration fillter section, sludge condensation section and mud extruded segment are sequentially connected, varying pitch and the first helical axis of variable diameters includes central shaft, the first rubber ring and the first helical blade, first helical blade is installed on center shaft, and the first rubber ring is enclosed between the first helical blade and wedge shape filter screen；Described sludge deep dehydrator includes helical feed and extruding all-in-one and extrusion dehydration room, described helical feed includes the second helical axis of the second helical blade, conveying housing and varying pitch with extruding all-in-one, second helical blade is arranged on the second helical axis, described extrusion dehydration room includes left filter, right filter and intermediate filtered plate, left filter and right filter, with intermediate filtered plate as axle, are flared out or inwardly close.

2. a kind of sludge concentration and dewatering desiccation integral processing meanss according to claim 1 it is characterised in that：Described sludge concentration device also includes charging aperture, discharging opening and spiral axial brake device, and described discharging opening includes discharging pressing plate, compression spring, stop collar and spacing regulating bolt.

3. a kind of sludge concentration and dewatering desiccation integral processing meanss according to claim 1 it is characterised in that：Described sludge deep dehydrator also includes driving means and the feed hopper being connected with sludge concentration device, feed hopper is connected with conveying housing, it is connected by bearing block between driving means and the second helical axis, described bearing block includes the taper roll bearing of a pair back-to-back installation.

4. a kind of sludge concentration and dewatering desiccation integral processing meanss according to claim 1 or 2 or 3 it is characterised in that：Intermediate filtered plate is made up of filter cloth, intermediate wedge filter screen, filter plate body, filtrate (liquid and compressed air inlet, and filter cloth, intermediate wedge filter screen and filter plate body form a hollow cavity.

5. a kind of sludge concentration and dewatering desiccation integral processing meanss according to claim 1 it is characterised in that：Left filter is made up of left filter cloth, left wedge shape filter screen, left outside shrouding and left liquid outlet, and left filter cloth, left wedge shape filter screen and left outside shrouding form the left filtrate chamber of a sealing；Right filter is made up of right filter cloth, right wedge shape filter screen, right outer shrouding and right liquid outlet, and right filter cloth, right wedge shape filter screen become the right filtrate chamber of a sealing with right covering plate shape.

6. a kind of sludge concentration and dewatering desiccation integral processing meanss according to claim 1 it is characterised in that：Extrusion dehydration room also includes opening device, opening device is by opening oil cylinder or cylinder, left connecting rod, right connecting rod, hinged seat form, left connecting rod and right connecting rod are hinged with left filter and right filter respectively, when the piston rod opening oil cylinder or cylinder stretches out, left filter and right filtration plate closing, when the piston rod opening oil cylinder or cylinder is retracted, left filter and right filter are flared out discharging.

7. a kind of sludge concentration and dewatering desiccation integral processing meanss according to claim 1 it is characterised in that：Extrusion dehydration room also includes locking device, locking device is made up of locking cylinder or cylinder, locking pin, left filter is provided with left locking lug plate holes, right filter is provided with right locking lug plate holes, when the piston rod of locking cylinder or cylinder stretches out or retracts, drive locking pin insertion or exit left locking lug plate holes and right locking lug plate holes, make left filter and right filtration plate closing or open.

8. a kind of sludge concentration and dewatering desiccation integral processing method it is characterised in that：Comprise the following steps：

Step one：Primary concentration is dehydrated：Pending mud is delivered to sludge concentration device, preliminary extruding and drive mud to wedge shape filter screen is carried out by the first helical axis of sludge concentration device to mud, mud passes sequentially through that sewage of low concentration fillter section filters most of Free water, sludge condensation section filters remaining Free water and mud extruded segment filters partial interior water, and mud granule is separated with water；

Step 2：Two grades of deep dehydrations, mummification：The mud crossed through primary concentration processed is delivered to sludge deep dehydrator, conveyed with extruding all-in-one through helical feed and extruded to extrusion dehydration room, in extrusion dehydration room, when left filter and right filtration plate closing, the surface adsorption water of compressed air stripping mud granule, makes sludge drying, discharges filtrate simultaneously, when left filter and right filter are flared out, you can be met the mud of water content requirement.

9. a kind of sludge concentration and dewatering desiccation integral processing method according to claim 8 it is characterised in that：In step：The rotary speed of the first helical axis controls in 1.5-3.5r/min.

10. a kind of sludge concentration and dewatering desiccation integral processing method according to claim 8 it is characterised in that：In step 2：The toggle speed of the second helical axis of helical feed and extruding all-in-one, in 7r/min, after mud is filled up in extrusion dehydration room, starts to be dehydrated；Increase with pressure, the rotary speed of the second helical axis is gradually lowered, and when rotary speed is reduced to 1.5r/min, intermediate filtered plate is passed through compressed air, the surface adsorption water of compressed air stripping mud granule；Compressed air pressure is 0.7-1Mpa.