CN1413757A - Drain device for supporting filter medium - Google Patents
Drain device for supporting filter medium Download PDFInfo
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- CN1413757A CN1413757A CN 01136610 CN01136610A CN1413757A CN 1413757 A CN1413757 A CN 1413757A CN 01136610 CN01136610 CN 01136610 CN 01136610 A CN01136610 A CN 01136610A CN 1413757 A CN1413757 A CN 1413757A
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Abstract
A sewer apparatus for supporting filter medium and distributing the back-flushing liquid of air and water is composed of a top wall, a bottom wall and two side walls to form an open internal cavity. The said top wall has the reinforcing cross member. An internal portition can divide the internal space into primary and secondary branch pipes to form a distributing pipe for delivering the back-flushing liquid of air and water.
Description
FIELD OF THE INVENTION
The present invention relates to the drain device that in the water treatment system filter medium play supporting role.More particularly, the present invention relates to be used for when filter plant is operated, to collect the water that filters and utilize gravel filter medium supporting system or porous plate medium supporting system provides supporting to the filter medium of treatment system.
Background technology
The filter plant of water, waste water and industrial liquid generally has drain device, is used for supporting filter medium, so filter medium and filter bottom separate.Drain device can have gravel filter medium support, then uses the porous plate media support recently, prevents that filter medium from entering substructure and also can help through the operation of backwashing.
The drain device of water treatment system has three main tasks: for filter medium provides supporting, collect the water of the filtration passed filter medium and make backwash water, backwash air or the combination of the two be evenly distributed on the whole medium.
Drain device precast concrete block commonly used is made.Recently, drain device is with highdensity waterproof plastic pressing forming, and this plastics are in light weight, and freight charges are low, thereby are applied in filtration system.High-intensity block is placed on filter bottom side by side end to endly, forms one " false bottom ".Block provides supporting and its shape to make to be convenient to collect to filter medium and passes the water that medium has filtered.The supporting system of medium can prevent that filter medium from entering and damaging substructure, and can distribute the liquid that backwashes more equably.The medium supporting system separates filter medium and drain device and substructure, and two kinds of type classes are arranged: a kind of is 12 to 16 inches thick gravel layers, and another is the most recently used porous plate, and its typical thickness is 1 to 2 inch.Porous plate is hanging to the drain device top and is fixed to substructure.Drain device generally has conduit, often is called branched pipe, and the air or the clean water that are made for the liquid that backwashes pass through.All for the such pipeline of air flow collection pipe be the part of air distribution system of backwashing.Backwash water is directed in the system by gutter, and the air flow collection pipe racks entrance pressure air that contracts enters branched pipe or distribution ducts is distributed by pipeline from the header top through gutter.
In backwash process, air enters the air branched pipe of drain device through the air distribution road.Compressed air can be used as the liquid that backwashes, and also can mix with water as gas/water liquid that backwashes.The mixture of compressed air/water impels the water of filtration to be upward through filter medium with enough speed, prevents the generation of filtration problem, as the accumulation of condensation product on the cracking that forms mud ball, porous filtering material, the filtering particle, and the formation of dead space in the medium.Drain device also plays a part filter medium and air distribution are separated, and prevents that the aperture in the pipeline is filtered the obstruction of medium particulate.
A kind of liquid that backwashes is superior separately for liquor ratio air or water because gas/water backwashes, so need a kind of novel advanced person's drain device, can provide air branched pipe and moisture arm simultaneously when filtered water or other liquid are made filtration treatment.The drain device of existing weak point can be loaded onto the sky G﹠W liquid that backwashes simultaneously, but (area of prior art short block body is about 33 square inches, i.e. 21.9cm because of the insufficient area of main split's pipe is transported a large amount of water
2), so only limit to 16 feet of catheter lengths (4.8m).The height of most of existing drain device is 12 inches (30cm).Be restricted using because of the capacity relationship of its backwash air and the backwash water that can transport of usefulness at present than the short block body.
The content of invention
The favourable part of drain device of the present invention is that its roof shape helps strengthening bulk strength, makes the weight of its energy supporting filter medium.Cross member is arranged on the roof, can increase bulk strength, thereby the weight of energy supporting filter medium.Make of the end face of drain device easily and also have a projection, if prepare with porous plate as the filter medium support, then this projection is convenient to improve the assembling and the sealing property of porous plate in the block top.
This drain device also provides long distributing pipe or branched pipe for the drain device of filter plant.The shape of this novel advanced person's drain device is made and is installed more conveniently compared with the drain device of standard, and manufacturing cost reduces greatly.Because this drain device is shorter than the block of prior art, therefore block of the present invention is more filter medium, and the headroom between being at the bottom of top of media and the lautertuns provides than large space.Block of the present invention can have the more air/water liquid that backwashes than other blocks of same height.The shape of branched pipe partition wall makes it compare its main split's pipe face with the block of prior art bigger area, i.e. every square feet of (900cm
2) filter area inferior division pipe area increased more than 1/3rd.
Block can be eliminated dead band in the medium than weak point.Drain device of the present invention is wideer usually than previous block, so this drain device may comprise less block, thereby reduces the set-up time.
A drain device of filter media systems comprises a roof, a diapire and two sidewalls that connect roof and diapire.Roof has inner surface and outer surface.In one embodiment, the outer surface of roof has rood beam, can strengthen roof.In another embodiment, on the inner surface of roof rood beam is arranged.The rood beam of two embodiment comprise the same long raised line with block width and more than two or two perpendicular to two raised lines and the cross band that is attached thereto.Drain device also comprises many internal partition walls, on two main distribution ducts are arranged, internal partition wall comprises the dividing wall of two branched pipes and the dividing wall of central authorities, internal partition wall also has two secondary conduits, this secondary distribution ducts is separated by two branched pipe dividing walls and main distribution ducts, and each branched pipe dividing wall has top section and following section; And the central strip wall is spaced-apart with two main distribution ducts between roof and diapire, and the central strip wall is also spaced-apart with second mate's distribution ducts.
Main distribution ducts comprises Shang Qu, middle district and inferior segment, and last district is used to carry air, the inferior segment transporting water, and there is one gas/water termination in middle district.The mixture that free G﹠W is arranged in the preferred secondary distribution ducts.Top section of the branched pipe dividing wall can have many air dispensing orifices, and following section of branched pipe dividing wall can have many water dispensing orifices.Roof can have the discharge orifice of many empty G﹠Ws.
Sidewall has inner surface and outer surface, and the distance between the outer surface of two side is the width of drain device, and this width adjusting scope is about 12 inches (30cm) to 24 inches (60cm).In one embodiment, its sidewall has inner surface and outer surface, and the distance between the outer surface of two sidewalls is the width of drain device, and this width adjusting value is about 18 inches (45cm).The height of drain device at 6 inches (15cm) to the scope of 10 inches (25cm).The drain device height preferably is about 8 inches (20cm).
In another embodiment, the central strip wall can divide, so drain device can be divided into less block more than two or two.The branched pipe dividing wall can tilt.Otherwise, also curved surface.The adjacent the most handy locking mechanism of drain device is connected to each other.Locking mechanism can comprise the spigot-and-socket interface, and socket has the quick lock in joint.Some drain devices that lock mutually are preferably formed as a public main distribution ducts, and its length is between 20 feet (6m) to 40 feet (12m).Some drain devices that lock mutually preferably also form a public secondary distribution ducts, and its length is between 20 feet (6m) to 40 feet (12m).
A kind of have that air backwashes and the drain device of the filter media systems of water backwash system can comprise: a roof has many empty G﹠W discharge orifices and shape to make the rood beam that is check shape pattern on it; One diapire and two sidewalls that link to each other with diapire with roof, it has inner surface and outer surface.Distance between the outer surface of two side at 12 inches (30cm) to the scope of 24 inches (60cm).Each internal partition wall has first main split pipe and second main split pipe.Internal partition wall can comprise several branch pipe partition wall and a central partition wall.Internal partition wall also has the first secondary branched pipe and the second secondary branched pipe.Secondary branched pipe is separated by two branched pipe partition walls with the main split pipe.Section and following section above the branched pipe partition wall has have many air dispensing orifices on top section of the branched pipe partition wall and many water dispensing orifices are arranged on following section.Central authorities' partition wall is between roof and diapire.Central authorities' partition wall separates first main split pipe with second main split's pipe, central partition wall also separates the first secondary branched pipe and the second secondary branched pipe.
The drain device of an embodiment also comprises first end and second end, and wherein first end has bellmouth and second end has socket, and the socket end has the quick lock in joint, so adjacent block can be combined into one with locking mechanism.On the one hand, main split's pipe comprises the district, middle district and inferior segment, and last district carries air, the inferior segment transporting water, and there is an air/water interface in middle district.On the other hand, secondary branched pipe has a zone of carrying air water temperature compound.Distance between the outer surface of two side is about 18 inches (45cm), in this, the height of drain device at 6 inches (15cm) to 10 inches (25cm) scopes.The height of drain device is preferably about 8 inches (20cm).On the other hand, central partition wall can divide, so drain device can be divided into more than two or two.Branched pipe partition wall in the middle of roof and diapire tilts.Otherwise the branched pipe partition wall in the middle of roof and diapire is curved surface also.In one embodiment, the drain device of many mutual lockings forms a public secondary distribution ducts, its length at 20 feet (6m) to the scope of 40 feet (12m).
The simple declaration of accompanying drawing
Fig. 1 is the cross section of one embodiment of the invention, and oblique branched pipe partition wall is shown.
Fig. 2 is the cross section of another embodiment, and the branched pipe partition wall of curved surface is shown.
Fig. 3 is the plane of branched pipe block roof.
Fig. 4 is the cross section of drain device, and support ring is shown.
Specific embodiment
Put it briefly, drain device of the present invention had both supported filter medium, and filter medium and waste liquid are separated, and can provide passage again, made the liquid that backwashes of sky G﹠W be assigned to whole system.The roof that drain device provides dexterously, its shape can be strengthened block, makes the weight of its energy supporting filter medium.Rood beam is arranged on the roof.Can improve bulk strength, thereby the weight of energy supporting filter medium.The end face of drain device easy to use also has a projection, when the assembling and the sealing property that can improve during as the supporting system of filter medium with porous plate at the porous plate at block top.
On the one hand, drain device of the present invention is shorter than previous drain device height, and wider width.When drain device of the present invention locked mutually, distribution ducts or branched pipe that they form were just long than the drain device that has earlier.Branched pipe is long more, and the capacity that many more air/water just must be arranged is downwards by branched pipe length, because its main split's pipe area is bigger.Because friction has pressure along the branched pipe tube wall and falls, thereby cause the backwash inhomogeneous distribution of liquid of air water.The present invention can realize making the air water liquid long branched pipe of passing by that backwashes, and the liquid that backwashes simultaneously can evenly be fitted on whole filtration system.Branched pipe can make drain device of the present invention be applied in the bigger filter than length.And, because this drain device is shorter than previous block, therefore, is permitted more space or headroom for a long time and supplied with the filter medium that appends, thereby improved the efficient of filter media systems.The width of this drain device is big, allows medium to take less block.Gu and reduce the set-up time.
The branched pipe partition wall of curved surface of the present invention or inclination allows the more empty G﹠W branched pipe total length of passing by downwards, thereby improves the distribution of the liquid that backwashes.Because drain device of the present invention has a central partition wall, so the length of drain device can reduce by half and can not lose the required intensity of support media.Making width so is not that the medium of block width multiple is installed than being easier to.
Referring to Fig. 1 and Fig. 3, one embodiment of the present of invention shown in the figure.Say that tout court drain device 10 has 54, two sidewalls 56,57 of a roof 52, one diapires and many internal partition wall 25X, 25Y, 58, these internal partition walls form many pipe 20a, 20b of main split and many secondary branched pipe 30a, 30b.Roof has inner surface 59 and outer surface 51.In one embodiment, rood beam 62,64 is arranged on the outer surface 51 of roof 52, can strengthen roof 52. Rood beam 62,64 can have along the raised line 62 of block width distribution and two or more be arranged and above-mentioned raised line 62 cross bands 64 connected vertically.The number of raised line and cross band can change.The purposes of raised line and cross band is to strengthen the end face of drain device, makes the weight of its energy supporting filter medium.The personage who is proficient in drain device 10 manufacturing technologies can determine that the filter medium that uses on the concrete filter supports the required raised line 62 and the number of cross band 64.In some filter, on the whole length of drain device 10, use 16 raised lines 62.The total amount how many raised line 62 quantity depend on the filter medium that uses in the filter with and desirable strength.
Fig. 3 and Fig. 4 illustrate another embodiment of the present invention, and its shape is suitable for the filtration system of porous plate as the filter medium supporting system.In this embodiment, the roof 52 of drain device 10 comprises periphery 67.The periphery 67 of roof 52 has formed the support ring 68 that surrounds the porous plate (not shown), the average wall thickness of roof and diapire 52,54 and sidewall 56,57 in the scope of 7.0mm to 8.0mm, 7.14mm preferably.The thickness of support ring 68 is in the scope of 6.0mm to 7.0mm.Need the long period if support ring is thicker in its forming process, the block quantity that each operating process is produced reduces.
On the other hand, enter block 10 above the air flow collection Guan Kecong, enter block by the drop pipe (not shown).The tank of filter (not shown) bottom carries waste water and leaves filter, and backwash water is sent main split pipe 20a, 20b to. Main split pipe 20a, 20b are the public distributing pipes of carrying empty G﹠W. Main split pipe 20a, 20b preferably include carry air go up district 22, the middle district 24 that the inferior segment 26 of transporting water and air and water contact therein.Branched pipe partition wall 25X, 25Y comprise top section 28 and following section 27.Many air dispensing orifices 44 are arranged for top section 28, main split pipe 20a, 20b are communicated with secondary branched pipe 30a, 30b.Many water dispensing orifices 42 are arranged on following section 27, main altar pipe 20a, the 20b of dividing is communicated with secondary branched pipe 30a, 30b.Drain device 10 preferably includes the pipe 20a of first main split, second main split pipe 20b, the first secondary branched pipe 30a and the second secondary branched pipe 30b.
Central authorities' partition wall 58 media separate pipe 20a of first main split and the pipe 20b of second main split, and the first secondary branched pipe 30a and the second secondary branched pipe 30b are separated in the middle of roof 52 and diapire 54.The central partition wall of strengthening 58 allows drain device 10 is cut into 2 half, so that can put in the filter of width less than drain device width multiple.
In a preferred embodiment shown in Figure 2, branched pipe partition wall 25a, 25b is a curved surface.Otherwise the drain device that Fig. 1 describes comprises branched pipe partition wall 25X, the 25Y of annular.The interior shape of major-minor branched pipe 20a, 20b, 30a, 30b makes backwash air and backwash water distributed uniform.The pipe of the main split by branched pipe length 20a, 20b provide than large tracts of land air downwards for conveying is backwashed for branched pipe partition wall 25X, 25Y.It is 68.2 square inches of (440cm that the drain device 10 best main split pipe areas of curved surface branched pipe partition wall 25a, 25b are arranged
2), by contrast, the main split's pipe area that has the block of oblique partition wall 25X, 25Y to comprise is about 65.4 square inches of (42.2cm
2).Have the main split pipe area of block 10 of oblique branched pipe partition wall also bigger, because branched pipe partition wall 25X, 25Y be from diapire 54 vertical lifting, oblique then top, inclination angle be 122 ° of angles preferably.Therefore, branched pipe 20a, 20b, 30a, 30b are longer, thereby make air be evenly distributed to whole filter medium.A large amount of air/water flow with enough low speed, the therefore pressure reduction that causes by friction, thus keep uniform distribution.This drain device 10 can lock mutually, is split into branched pipe 20a, 20b, 30a, 30b.Its length can reach 40 feet (12m), thereby the distribution state of the empty G﹠W of set point is remained in the industrial standard mean value positive and negative 5%.Before the present invention, branched pipe length has only 16 feet (4.8m).
The height of preferred drain device 10 to 10 inches (25cm) scopes, is recommended the block height with 8 inches (20cm) at 6 inches (20cm).The aspect ratio prior art block of 8 inches (20cm) few 4 inches (10cm), the income of these 4 inches (10cm) makes between medium end face and the lautertuns bottom surface or 4 inches (10cm) above media depth is arranged, and 4 inches (10cm) above headroom is perhaps arranged.
In a preferred embodiment, drain device 10 is pressed in the above-mentioned preferred structure.The plastics that are injected into that the most handy light weight density of block is high are made, as polyethylene.
Claims (27)
1. the drain device (10) of supporting filter medium in the water processing filtering system, this drain device (10) comprising:
One roof (52), a diapire (54) is with two sidewalls (56,57) that are connected roof (52) and diapire (54);
Roof (52) comprises rood beam (62,64), can strengthen roof (52);
Two main distribution ducts (20a, 20b) are arranged on each internal partition wall (25X, 25Y, 58), this internal partition wall (25X, 25Y, 58) comprises two branched pipe partition walls (25X, 25Y) and a central partition wall (58), internal partition wall (25X, 25Y, 58) is gone up also has two secondary conduits (30a, 30b), the secondary distribution ducts of each bar (30a, 30b) separates with branched pipe partition wall (25X, 25Y) with main distribution ducts (20a, 20b), and each branched pipe partition wall (25X, 25Y) has upper part (28) and lower part (27); And
Central authorities' partition wall (58), it is between roof (52) and diapire (54), and central partition wall (58) separates each other two main distribution ducts (20a, 20b), and central partition wall (58) also separates each other two secondary distribution ducts (30a, 30b).
2. the drain device in the claim 1 (10) wherein has many dispensing orifices (44) on the upper part (28) of branched pipe partition wall (25X, 25Y).
3. the drain device in the claim 1 (10) wherein has many dispensing orifices (42) on the lower part (27) of branched pipe partition wall (25X, 25Y).
4. the drain device in the claim 1 (10) wherein has many discharge orifices (53) on the roof (52).
5. the drain device in the claim 1 (10), wherein sidewall (56,57) has inner surface (56a, 57a) and outer surface (56b, 57b), the spacing of the outer surface (56b, 57b) of two side (56,57) is the width of drain device (10), in the scope between this width adjusting to 12 inch (30cm) to 24 inches (60cm).
6. the drain device in the claim 1 (10), wherein sidewall (56,57) has inner surface (56a, 57a) and outer surface (56b, 57b), the outer surface (56b, 57b) of two side (56,57) be the width of drain device (10) at interval, about this width adjusting to 18 inch (45cm).
7. the drain device in the claim 1 (10), wherein the height of drain device (10) at 6 inches (15cm) to the scope of 10 inches (25cm).
8. the drain device in the claim 1 (10), wherein the height of drain device (10) is about 8 inches (20cm).
9. the drain device supporting system of supporting filter medium in the water treatment filter, this drain device comprises air backwash system and water backwash system, substructure and porous plate, this drain device (10) comprising:
One roof (52) has many discharge orifices (53) on this roof (52); One diapire (54), the sidewall (56,57) that is connected roof (52) and diapire (54) with two, sidewall (56,57) has inner surface (56a, 57a) and outer surface (56b, 57b), wherein the spacing of the outer surface (56b, 57b) of two side (56,57) at 12 inches (30cm) to 24 inches (60cm) scopes.
Roof (52) comprises rood beam, can strengthen roof (52), and roof also comprises periphery 67, and periphery 67 forms support ring 68, can encase porous plate.
Each internal partition wall (25X, 25Y, first main split pipe (20a) and second main split pipe (20b) is arranged 58), internal partition wall (25X, 25Y, 58) comprise two branched pipe partition wall (25X, 25Y) with a central partition wall (58), internal partition wall (25X, 25Y, 58) also have the first secondary branched pipe (30a) and the second secondary branched pipe (30b), this two secondary branched pipe (30a, 30b) by two branched pipe partition wall (25X, 25Y) with the pipe (20a of two main splits, 20b) separate, branched pipe partition wall (25X, 25Y) upper part (28) and lower part (27) are arranged, branched pipe partition wall (25X, many dispensing orifices (44) are arranged, branched pipe partition wall (25X on upper part 25Y) (28), many dispensing orifices (42) are arranged on lower part 25Y) (27); And
Central authorities' partition wall, between roof (52) and diapire (54), this central authorities' partition wall (58) separates first main split pipe (20a) and second main split pipe (20b), and central partition wall (58) also separates the first secondary branched pipe (30a) and the second secondary branched pipe (30b).
10. the drain device in the claim 9 (10), wherein main split's pipe (20a, 20b) comprises district (22), middle district (24) and inferior segment (26).
11. the drain device in the claim 9 (10), wherein secondary branched pipe (30a, 30b) comprise that one carries the zone (26) of air and aqueous mixtures.
12. the drain device in the claim 9 (10), wherein the spacing of the outer surface (56b, 57b) of two side (56,57) is adjusted to about 18 inches (45cm).
13. the drain device in the claim 9 (10), wherein the height of drain device (10) at 6 inches (15cm) to 10 inches (25cm) scopes.
14. the drain device in the claim 9 (10), wherein the height of drain device (10) is about 8 inches (20cm).
15. the drain device in the claim 9 (10), wherein the average thickness of sidewall is in 7.0mm to 8.0mm scope.
16. the drain device in the claim 9 (10), wherein the average thickness of sidewall is about 7.14mm.
17. the drain device in the claim 9 (10), wherein the average thickness of support ring is in the scope of 6.0mm to 7.0mm.
18. the drain device in the claim 9 (10), wherein the average thickness of support ring is about 6.35mm.
19. the drain device (10) in above-mentioned any claim, wherein rood beam constitutes check shape pattern.
20. the drain device (10) in above-mentioned any claim, wherein central partition wall can divide, and therefore drain device (10) can be divided into two less blocks.
21. the drain device (10) in above-mentioned any claim, wherein rood beam comprises two or two above raised lines, extends on the whole width of roof, also comprises more than two or two vertical with raised line and extend in cross band between each raised line.
22. the drain device (10) in above-mentioned any claim, wherein the partition wall of branched pipe (58) is oblique.
23. the drain device (10) in above-mentioned any claim, wherein branched pipe partition wall (58) is a curved surface.
24. the drain device (10) in above-mentioned any claim, wherein adjacent drain device is connected to each other with locking mechanism.
25. the drain device (10) in above-mentioned any claim, wherein locking mechanism is the spigot-and-socket interface, comprises bellmouth (55a) and socket (55b), and socket comprises the quick lock in joint.
26. the drain device (10) in above-mentioned any claim, wherein the drain device of many interlockings forms princess's distribution ducts altogether, its length at 20 feet (6m) to the scope of 40 feet (12m).
27. the drain device (10) in above-mentioned any claim, wherein the drain device of many interlockings forms a public secondary distribution ducts, its length at 20 feet (6m) to the scope of 40 feet (12m).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01136610 CN1413757A (en) | 2001-10-22 | 2001-10-22 | Drain device for supporting filter medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01136610 CN1413757A (en) | 2001-10-22 | 2001-10-22 | Drain device for supporting filter medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1413757A true CN1413757A (en) | 2003-04-30 |
Family
ID=4673777
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01136610 Pending CN1413757A (en) | 2001-10-22 | 2001-10-22 | Drain device for supporting filter medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1413757A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104812457A (en) * | 2012-09-14 | 2015-07-29 | 塞莱默水处理齐利诺普尔有限公司 | Filter system with integral media retainer seal |
| CN104812457B (en) * | 2012-09-14 | 2016-11-30 | 塞莱默水处理齐利诺普尔有限公司 | There is the filtration system that integrated medium retainer seals |
| CN111298749A (en) * | 2020-03-19 | 2020-06-19 | 中国热带农业科学院湛江实验站 | Bagasse cellulose and lignin centrifugal separation synchronous processing screening equipment |
-
2001
- 2001-10-22 CN CN 01136610 patent/CN1413757A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104812457A (en) * | 2012-09-14 | 2015-07-29 | 塞莱默水处理齐利诺普尔有限公司 | Filter system with integral media retainer seal |
| CN104812457B (en) * | 2012-09-14 | 2016-11-30 | 塞莱默水处理齐利诺普尔有限公司 | There is the filtration system that integrated medium retainer seals |
| US10682592B2 (en) | 2012-09-14 | 2020-06-16 | Xylem Water Solutions Zelienople Llc | Filter system with integral media retainer seal |
| CN111298749A (en) * | 2020-03-19 | 2020-06-19 | 中国热带农业科学院湛江实验站 | Bagasse cellulose and lignin centrifugal separation synchronous processing screening equipment |
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