Wastewater impurity removal device for wet garbage

Abstract

The utility model relates to a waste water impurity removal device for wet garbage. A water outlet of a water storage tank at the lower part of a roller of a centrifugal dehydrator is communicated with a water inlet of a draining tank through a pipeline; a slag baffle extending downwards is arranged at the bottom of a sieve plate of the draining mechanism and connected with a bottom plate of the draining box, and a rear baffle at the bottom of a partition plate is connected with a back plate of the draining box and divides the draining box into a settling area, a sieving area, a clear water area and a concentrated liquid area; scum baffles are arranged on a back plate and a partition plate of the draining box, the top of the sieve plate and the top of the partition plate are provided with connecting parts in smooth cambered surface transition, and a channel allowing wastewater to overflow from the settling area to the sieving area to pass through is formed between the connecting parts and the top plate of the draining box; a water outlet is formed in the box wall, corresponding to the lower part of the filter screen of the concentrated liquid area, of the water draining box. The device is reasonable in structure, integrates centrifugal impurity removal and filtering impurity removal, can separate sand and stones, can better separate large-particle-size suspended matters, and is convenient to detect and maintain.

Description

TECHNICAL FIELD

[0001] The utility model relates to a wastewater impurity removal device for wet garbage belongs to wet garbage treatment technical field. BACKGROUND

[0002] Wet garbage includes kitchen waste and kitchen garbage. Kitchen waste mainly refers to food residues generated by public catering service departments, which is a mixture of oil, water, peel, vegetables, rice, fish, meat, bones, and waste tableware, plastic, paper towel and other substances. Kitchen waste has high organic matter content and high water content (70%-85%). Secondly, kitchen waste has high salt and oil content (3%-5%), which can cause serious harm to the environment if not specially classified and treated. Kitchen garbage is garbage generated in daily life, including fruit and vegetable garbage, leftovers, glass, ceramic, paper, etc. The content of easily perishable organic matter is low, the oil content is low, the impurity content is high, and the lignocellulose content is high.

[0003] The three-phase water produced after pretreatment of wet garbage has the characteristics of high COD, high organic matter and high SS. Whether the impurities in the three-phase water can be effectively removed directly affects the operation of the downstream membrane equipment. There are many impurity removal devices on the market, such as filters, hydraulic screens, sedimentators, centrifuges, etc. However, due to the characteristics of the three-phase water of wet garbage, its settling performance is poor, so sedimentation and centrifugation cannot effectively separate impurities, and filters require a lot of manual disassembly and washing, resulting in low efficiency; the hydraulic screen also has low yield and environmental problems.

[0004] CN220214029U discloses a kind of separation and impurity removal device for wet garbage organic slurry, box is located in water inlet side vertical and has stirring mechanism, box bottom is equipped with miscellaneous spiral conveyor along wastewater flow direction, box is obliquely arranged and has miscellaneous spiral conveyor, at least two baffles are arranged on the side plates in front and back of the box and form curved side flow channel, with reasonable structure, the sand and stone class impurities in the organic slurry of large block organic matter wet garbage that the water in the box is stirred by stirring mechanism, to reduce the loss of organic matter, can effectively disperse the sand and stone class impurities in the water entering the box. But using sedimentation method can only improve the collection and separation efficiency of sand and stone, but cannot remove large particle size suspended solids in wastewater.

[0005] CN207102087U discloses a kind of water power screen with automatic cleaning function, the utility model is equipped with closed and freely rotating water power screen net, surface waste is independently cleaned, and second water power screen net is configured, multi-stage filtration is realized, and solid-liquid separation effect is improved. However, the liquid directly falls on the screen plate in this water power screen, which cannot guarantee uniform flow, causing local loss to be faster, especially the chain wheel structure is prone to failure, and maintenance is not convenient. SUMMARY

[0006] The utility model discloses a structure is reasonable, centrifugal impurity removal and filter impurity removal integration in one, not only have to sandstone carry out separation, can also carry out good separation to large particle size suspended matter, and a kind of wastewater impurity removal device for wet garbage is convenient for detection maintenance.

[0007] The utility model discloses a technical scheme that reaches above-mentioned purpose is: a wastewater impurity removal device for wet garbage, characterized by: including centrifugal dehydrator and drainage mechanism,

[0008] The centrifugal dehydrator is used for centrifugal impurity removal to wastewater, and includes shell and the drum with filter hole in the shell, the lower part of the drum is equipped with water storage tank, and the water outlet of water storage tank is connected with the water inlet of drainage tank through pipeline, and the discharge port of the drum one side is connected with discharge pipe,

[0009] The drainage mechanism is used for drainage impurity removal to wastewater after centrifugal dehydration, and includes drainage tank and the baffle in drainage tank and screen plate with filter hole, the end of both sides of baffle and screen plate is connected with the both side board of drainage tank, the bottom of screen plate has the downward extension of baffle board and is connected with the bottom plate of drainage tank, the back baffle of baffle bottom is connected with the back plate of drainage tank, and drainage tank is divided into sedimentation zone, screening zone and clear water zone between screen plate and baffle and front lower part's thick liquid zone,

[0010] The back plate and baffle of drainage tank are equipped with scum baffle that blocks suspended matter floating, and the top of screen plate and the top of baffle have the connecting portion of smooth arc surface transition between the top plate of drainage tank, and there is the passageway that wastewater overflows from sedimentation zone to screening zone, the middle lower part of the tank wall in sedimentation zone of drainage tank is equipped with water inlet, and the tank wall on clear water zone of drainage tank is equipped with clear water discharge port, the bottom of the tank wall in sedimentation zone of drainage tank is equipped with blowdown, the thick liquid zone is equipped with filter screen, and the tank wall on the filter screen lower part of drainage tank in thick liquid zone is equipped with drain.

[0011] The utility model discloses centrifugal dehydrator and drainage mechanism, through centrifugal dehydrator can remove large particle size impurities, then the wastewater after centrifugal dehydration is carried out in drainage mechanism and is drained and is removed, and drainage tank is divided into sedimentation zone, screening zone and clear water zone between screen plate and baffle and front lower part's thick liquid zone in drainage tank, and the wastewater after centrifugal dehydration is carried out in drainage tank and is carried out gravity screening in screening zone after sedimentation, especially, the utility model discloses the scum baffle that blocks suspended matter floating on back plate and baffle, and through scum baffle, large particle size suspended matter in wastewater is blocked and can settle to the bottom of sedimentation zone in the process of wastewater overflow, and the problem that large particle size suspended matter enters screening zone and causes screening efficiency to drop is greatly reduced, and the screening efficiency can be improved.The utility model discloses structure is reasonable, centrifugal impurity removal and filter impurity removal integration in one, not only have to sandstone carry out separation, can also carry out good separation to large particle size suspended matter, especially, in drainage tank, there is no transmission mechanism, and it is convenient for detection use maintenance. Attached Figure Description

[0012] The embodiments of this utility model will now be described in further detail with reference to the accompanying drawings.

[0013] Figure 1 This is a schematic diagram of the structure of a wastewater removal device for wet waste according to this utility model.

[0014] Figure 2 This is a schematic diagram of the drainage mechanism of this utility model.

[0015] Figure 3 This is a structural diagram of the drain box of this utility model with the side panels and back panel removed.

[0016] Figure 4 This is a schematic diagram of the structure of the sieve plate and partition of this utility model.

[0017] Figure 5 This is a cross-sectional view of the drainage mechanism of this utility model.

[0018] Wherein: 1—Centrifugal dewatering machine, 1-1—Outer shell, 1-2—Feeding port, 1-3—Drive mechanism, 1-4—Slag discharge pipe, 2—Enclosure, 3—Drainage mechanism, 3-1—Inspection door, 3-2—Drain outlet, 3-3—Drainage box, 3-4—Flushing pipe, 3-5—Observation door, 3-6—Sieve plate, 3-61—Backward inclined filter section, 3-62—Arc surface filter section, 3-7—Sieve section, 3-8—Slag basket, 3-81—Basket edge, 3-9—Concentrated liquid zone, 3-10—Slag baffle plate, 3-11—Clear water zone. 3-12—Baffle, 3-121—Rear baffle, 3-122—Sludge baffle, 3-123—Connecting part, 3-124—Backward inclined part, 3-125—Arc-shaped part, 3-13—Clear water outlet, 3-14—Water inlet, 3-15—Sedimentation zone, 3-16—Sludge discharge zone, 3-17—Sludge outlet, 3-18—Front scum baffle, 3-19—Rear scum baffle, 3-20—Water distribution mounting base, 3-21—Water distribution plate, 4—Support platform, 4-1—Support leg, 4-2—Support frame. Detailed Implementation

[0019] See Figures 1-3 As shown, this utility model discloses a wastewater removal device for wet waste, which includes a centrifugal dewatering machine 1 and a draining mechanism 3. It integrates centrifugal dewatering and draining into one unit, which can better remove impurities from the three-phase wastewater of wet waste.

[0020] See Figure 1As shown, the centrifugal dewatering machine 1 of this utility model is used to centrifuge and remove impurities from wastewater. It includes a shell 1-1 and a drum with filter holes inside the shell 1-1. A water storage tank is provided at the bottom of the drum. The outlet of the water storage tank is connected to the inlet 3-14 of the dewatering tank 3-3 through a pipeline. The slag outlet on one side of the drum is connected to the slag discharge pipe 1-4. The centrifugal dewatering machine 1 of this utility model adopts the existing drum centrifugal dewatering machine. The upper part of the outer shell 1-1 is provided with a feeding port 1-2. The pre-treated three-phase water is added into the drum. The screen hole diameter of the drum is 3-8mm, and the rotation speed can be 1000-3000r / min. The drum is driven by a drive mechanism 1-3. During the rotation, the drive mechanism is an existing electric drive mechanism and is set inside the protective cover. The three-phase water is separated into solid and liquid by centrifugal force. The wastewater after solid-liquid separation enters the dewatering mechanism 3 for further impurity removal treatment. The solid residue after centrifugation is discharged to the slag discharge pipe 1-4 through the slag outlet, and then sent to the subsequent screw conveyor or slag box for subsequent processing.

[0021] See Figure 1 As shown, this utility model also has a support platform 4, which is connected and fixed to multiple support legs 4-1 through a support frame 4-2. The support platform 4 is provided with a fence 2, and the opening of the fence 2 is provided with a step to facilitate the observation and maintenance of the staff. The centrifugal dewatering machine 1 is installed at the rear of the support platform 4. Since the slag discharge pipe 1-4 of the centrifugal dewatering machine 1 is set vertically, the problem of bend pipe blockage can be avoided through the vertical slag discharge pipe 1-4. The drain box 3-3 is located at the lower front of the support platform 4. Therefore, the centrifugal dewatering machine 1 and the draining mechanism 3 are integrated into one unit through the support platform 4.

[0022] See Figures 1-4 As shown, the draining mechanism 3 of this utility model is used to drain and remove impurities from wastewater after centrifugal dewatering, removing sand, gravel, and large-diameter suspended solids from the wastewater. The draining mechanism 3 includes a draining tank 3-3, a partition 3-12 and a sieve plate 3-6 with filter holes disposed within the draining tank 3-3. The sieve holes on the sieve plate 3-6 are between 0.3-0.6 mm, allowing for gravity sieving to remove impurities. Because the draining tank 3-3 is closed, no liquid splashing occurs during the draining process, preventing environmental pollution.

[0023] See Figures 3-5As shown, the ends of the sieve plate 3-6 and the partition plate 3-12 on both sides of this utility model are connected to the side plates of the drain box 3-3. The bottom of the sieve plate 3-6 has a downward-extending baffle plate 3-10 that is connected to the bottom plate of the drain box 3-3. The rear baffle plate 3-121 at the bottom of the partition plate 3-12 is connected to the back plate of the drain box 3-3, dividing the drain box 3-3 into a sedimentation zone 3-15, a screening zone 3-7, a clear water zone 3-11 between the sieve plate 3-6 and the partition plate 3-12, and a concentrated liquid zone 3-9 at the lower front. The wastewater after centrifugal dewatering is sedimented in the drain box 3-3 and then enters gravity screening. After screening, clear water and concentrated liquid are formed, and the clear liquid and concentrated liquid are discharged for subsequent processing. As shown in Figures 3 and 5, the back plate and partition plate 3-12 of the drain box 3-3 of this utility model are equipped with scum baffles to prevent suspended solids from rising. During wastewater overflow, the scum baffles prevent large-diameter suspended solids in the wastewater from settling to the bottom of the sedimentation zone 3-15, thus significantly reducing the entry of large-diameter suspended solids into the screening zone 3-7. Figures 3-4 As shown, the top of the sieve plate 3-6 and the top of the partition plate 3-12 have a smoothly curved connecting part 3-123. Between this part and the top plate of the drain box 3-3, there is a channel through which wastewater overflows from the sedimentation zone 3-15 to the screening zone 3-7. The wastewater overflows from the sedimentation zone 3-15 through the channel and enters the screening zone 3-7, where it is filtered through the filter holes of the sieve plate 3-6. The smooth curved surface of the connecting part 3-123 allows the water to flow gently onto the surface of the sieve plate 3-6, ensuring that the fluid is distributed as evenly as possible on the sieve plate 3-6. Under the action of gravity, the wastewater passes through the sieve holes, thus removing impurities. See Figures 3-5 As shown, the draining tank 3-3 of this utility model has an inlet 3-14 on the lower middle part of the wall of the sedimentation zone 3-15. Wastewater after centrifugation enters the sedimentation zone 3-15. The draining tank 3-3 also has a clear water outlet 3-13 on the wall of the clear water zone 3-11, from which the clear liquid after drainage is discharged for subsequent processing. Finally, the draining tank 3-3 has a drain outlet 3-17 at the bottom of the wall of the sedimentation zone 3-15, from which large particles after sedimentation are discharged. See... Figures 3-5 As shown, the concentrated liquid zone 3-9 of this invention is equipped with a filter screen, and the drain tank 3-3 has a drain outlet 3-2 on the tank wall corresponding to the lower part of the filter screen in the concentrated liquid zone 3-9. Therefore, the concentrated liquid that has not passed through the sieve plate 3-6 after filtration flows into the lower concentrated liquid zone 3-9 under gravity and is collected. In the concentrated liquid zone 3-9, the concentrated liquid undergoes further gravity filtration through the filter screen. After filtration, the concentrated liquid is discharged from the drain tank 3-3 through the drain outlet 3-2, while the residue that remains in the concentrated liquid zone 3-9 and has not passed through the filter screen is also discharged from the drain tank 3-3. See Figure 3 , 5As shown, the drain box 3-3 of this utility model has an inlet 3-14 in the middle and lower part of the back plate of the sedimentation zone 3-15. The outlet of the inlet 3-14 faces downward and is opposite to the rear baffle 3-121. The drain box 3-3 has a clean water outlet 3-13 in the back plate of the clean water zone 3-11, which facilitates the laying of pipelines.

[0024] See Figure 5 As shown, the drain box 3-3 of this utility model is provided with a water distribution mounting seat 3-20, which is connected to the top plate. The water distribution plate 3-21 is installed on the water distribution mounting seat 3-20. The bottom of the water distribution plate 3-21 is located at the top of the screen plate 3-6, and a water distribution channel is provided between the water distribution plate 3-21 and the screen plate 3-6. The height δ of the water distribution channel can be adjusted. Therefore, the water distribution plate 3-21 serves to block water and prevent water droplets from splashing. On the other hand, the water distribution plate 3-21 can further adjust the height δ of the water rolling on the screen plate 3-6 through the water distribution channel, so that the water overflowing onto the surface of the screen plate 3-6 flows down by gravity as close to the surface of the screen plate 3-6 as possible, and the wastewater is better screened by gravity. The height δ of the water distribution channel can be adjusted by the gasket between the water distribution mounting seat 3-20 and the water distribution plate 3-21 connection part 3-123.

[0025] See Figures 3-5 As shown, the filter screen of the concentrated liquid zone 3-9 of this utility model consists of at least two slag baskets 3-8. The top of the slag basket 3-8 is provided with basket edges 3-81 around its perimeter. The slag basket 3-8 is provided with handles on the basket edges 3-81 on both sides. The inner side of the front wall of the dewatering tank 3-3 is provided with a front support edge, and the top of the baffle plate 3-10 is provided with a rear support edge. The basket edges 3-81 of the slag basket 3-8 are supported on the front support edge and the rear support edge. The basket edges 3-81 of the slag basket 3-8 are flush with the sieve plate 3-6. The concentrated liquid that does not pass through the sieve plate 3-6 flows into the lower slag basket 3-8 under gravity. The concentrated liquid is further filtered in the slag basket 3-8 and passes through the drain outlet 3-2. The drain outlet 3-2 is provided with a shut-off valve, which is normally open in the working state to discharge the filtered concentrated water. The slag material in the slag basket 3-8 is taken out and discharged into the slag box and then discharged from the dewatering tank 3-3. The drain box 3-3 of this utility model has a corresponding inspection door 3-1 hinged at the front. The concentrated liquid area 3-9 is located below the inspection door 3-1, which facilitates the operation of the slag basket 3-8.

[0026] The drain box 3-3 of this utility model is equipped with a concentrated liquid screw conveyor at the concentrated liquid zone 3-9. The concentrated liquid screw conveyor is located above the filter screen. Therefore, when the concentrated liquid in the concentrated liquid zone 3-9 is pushed out to the outlet side by the concentrated liquid screw conveyor, the concentrated liquid is filtered. The filtrate is discharged through the drain outlet 3-2, while the slag is pushed out of the drain box 3-3 and enters the slag box.

[0027] See Figures 3-5As shown, the partition 3-12 of this utility model has a smooth arc-shaped connecting part 3-123 at the top. The other end of the connecting part 3-123 is welded and fixed to the screen plate 3-6, thus fixing the partition 3-12 and the screen plate 3-6 into an integral structure. The screen plate 3-6 includes a backward-inclined filter part 3-61 and a lower part that transitions to the slag-blocking plate 3-10 through the arc-shaped filter part 3-62. Therefore, the water flows through the inclined surface of the backward-inclined filter part 3-61 and then enters the curved surface filter part 3-62 for gravity filtration, thereby extending the filtration path and allowing for better screening of wastewater. The partition 3- 12 includes a rearward inclined section 3-124 and a transition from the curved section 3-125 to the rear baffle 3-121, which allows large particles in the influent to settle downwards along the curved section 3-125, while increasing the capacity of the sedimentation zone 3-15, enabling better sedimentation of the influent. The baffle 3-12 has a baffle plate 3-122 on one side of the rear baffle 3-121 and forms a bottom drainage zone 3-16, which is connected to the sedimentation zone 3-15. The drain box 3-3 has a drain outlet 3-17 on the box wall on one side of the baffle plate 3-122 to discharge the sediment.

[0028] See Figure 5 As shown, the angle α between the plane of the backward-inclined filtering portion 3-61 of the sieve plate 3-6 and the horizontal plane is between 110° and 120°, such as when the angle α between the plane of the backward-inclined filtering portion 3-61 of the sieve plate 3-6 and the horizontal plane is between 122° and 128°. The angle β between the plane of the backward-inclined portion 3-124 of the baffle plate 3-12 and the horizontal plane is between 65° and 75°, such as when the angle β between the plane of the backward-inclined portion 3-124 of the baffle plate 3-12 and the horizontal plane is between 68° and 72°. At least two front scum baffles 3-18 The rear scum baffle 3-19 on the dewatering tank 3-3 is located between the two front scum baffles 3-18 and is parallel to the front scum baffles 3-18 and extends between the two front scum baffles 3-18. Therefore, large particulate matter suspended in the wastewater can be better blocked by multiple scum baffles. The top of the dewatering tank 3-3 is provided with an observation door 3-5 at the front scum baffle 3-18. Opening the observation door 3-5 makes it convenient to observe the treatment situation.

[0029] See Figures 3-5 As shown, the drain box 3-3 of this utility model is also equipped with a flushing pipe 3-4 with a shut-off valve. The outlet of the flushing pipe 3-4 is located at the rear baffle 3-121 of the partition 3-12 and is reversed to the drain outlet 3-17. Since the flushing pipe 3-4 is located on the other side of the drain outlet 3-17, the shut-off valve can be opened periodically, and the sand in the lower part of the sedimentation zone 3-15 can be flushed into the drain outlet 3-17 through the flushing pipe 3-4, so that the drain box 3-3 maintains a good drainage effect.

Claims

1. A wastewater purification device for wet waste, characterized in that: It includes a centrifugal dewatering machine (1) and a dewatering mechanism (3); The centrifugal dewatering machine (1) is used to centrifuge and remove impurities from wastewater. It includes a shell (1-1) and a drum with filter holes inside the shell (1-1). A water storage tank is provided at the bottom of the drum. The outlet of the water storage tank is connected to the inlet (3-14) of the drain tank (3-3) through a pipeline. The slag discharge port on one side of the drum is connected to the slag discharge pipe (1-4). The draining mechanism (3) is used to drain and remove impurities from the wastewater after centrifugal dewatering. It includes a draining tank (3-3), a partition (3-12) and a sieve plate (3-6) with filter holes installed in the draining tank (3-3). The ends of the sieve plate (3-6) and the partition (3-12) are connected to the side plates of the draining tank (3-3). The bottom of the sieve plate (3-6) has a downward-extending baffle plate (3-10) and is connected to the bottom plate of the draining tank (3-3). The rear baffle (3-121) at the bottom of the partition (3-12) is connected to the back plate of the draining tank (3-3) and divides the draining tank (3-3) into a sedimentation zone (3-15), a screening zone (3-7), a clear water zone (3-11) between the sieve plate (3-6) and the partition (3-12), and a concentrated liquid zone (3-9) at the lower front. The back plate and partition plate (3-12) of the drain box (3-3) are provided with scum baffles to prevent suspended solids from rising. The top of the screen plate (3-6) and the top of the partition plate (3-12) have a smooth arc transition connection (3-123), and there is a channel between the screen plate (3-6) and the top plate of the drain box (3-3) for wastewater to overflow from the sedimentation zone (3-15) to the screening zone (3-7). The drain box (3-3) is located in the sedimentation zone (3-15). The wall has an inlet (3-14) at the middle and lower part, and the drain box (3-3) has a clean water outlet (3-13) on the wall of the clean water zone (3-11). The drain box (3-3) has a drain outlet (3-17) at the bottom of the wall of the sedimentation zone (3-15). The concentrated liquid zone (3-9) is equipped with a filter screen, and the drain box (3-3) has a drain outlet (3-2) on the wall of the concentrated liquid zone (3-9) corresponding to the lower part of the filter screen.

2. The wastewater purification device for wet waste according to claim 1, characterized in that: The drain box (3-3) is also provided with a water distribution mounting base (3-20), and a water distribution plate (3-21) is installed on the water distribution mounting base (3-20). The width of the water distribution plate (3-21) is the same as the width of the sieve plate (3-6). The bottom of the water distribution plate (3-21) is located at the top of the sieve plate (3-6). A water distribution channel is provided between the water distribution plate (3-21) and the sieve plate (3-6). The height δ of the water distribution channel can be adjusted.

3. The wastewater purification device for wet waste according to claim 1, characterized in that: The filter screen of the concentrated liquid zone (3-9) consists of at least two slag baskets (3-8). The top of the slag basket (3-8) is provided with basket edges (3-81) around its perimeter. The slag basket (3-8) is provided with handles on the basket edges (3-81) on both sides. The inner side of the front wall of the dewatering box (3-3) is provided with a front support edge, and the top of the slag baffle plate (3-10) is provided with a rear support edge. The basket edges (3-81) of the slag basket (3-8) are supported on the front support edge and the rear support edge. The basket edges (3-81) of the slag basket (3-8) are flush with the sieve plate (3-6). The dewatering box (3-3) is hinged to a corresponding maintenance door (3-1) at the front. The concentrated liquid zone (3-9) is located below the maintenance door (3-1).

4. The wastewater purification device for wet waste according to claim 1, characterized in that: The drain box (3-3) is equipped with a concentrated liquid screw conveyor in the concentrated liquid area (3-9), and the concentrated liquid screw conveyor is located on the upper side of the filter screen.

5. The wastewater purification device for wet waste according to claim 1, characterized in that: The partition (3-12) has a smooth arc-shaped connecting part (3-123) at the top, and the other end of the connecting part (3-123) is welded and fixed to the sieve plate (3-6). The sieve plate (3-6) includes a backward-inclined filter part (3-61) and a lower part that transitions to the slag baffle (3-10) through the arc-shaped filter part (3-62). The partition (3-12) includes a backward-inclined part (3-124) and a part that transitions to the rear baffle (3-121) through the arc-shaped part (3-125). The partition (3-12) has a baffle plate (3-122) on one side of the rear baffle (3-121) and forms a bottom drainage area (3-16). The drainage area (3-16) is connected to the sedimentation area (3-15). The drain box (3-3) has a drain port (3-17) on the box wall on one side of the baffle plate (3-122).

6. A wastewater purification device for wet waste as described in claim 1 or 5, characterized in that: The angle α between the plane of the backward-inclined filtering part 3-61 of the sieve plate (3-6) and the horizontal plane is between 110° and 120°. The angle β between the plane of the backward-inclined part 3-124 of the partition plate (3-12) and the horizontal plane is between 65° and 75°. At least two front scum baffles (3-18) are perpendicular to the backward inclination of the partition plate (3-12). The rear scum baffle (3-19) on the drain box (3-3) is located between the two front scum baffles (3-18). The rear scum baffle (3-19) is arranged parallel to the front scum baffles (3-18) and extends between the two front scum baffles (3-18). The top of the drain box (3-3) is provided with an observation door (3-5) at the front scum baffle (3-18).

7. The wastewater purification device for wet waste according to claim 1, characterized in that: The drain box (3-3) has an inlet (3-14) on the lower middle part of the back plate of the sedimentation zone (3-15). The outlet of the inlet (3-14) faces downward and is opposite to the rear baffle (3-121). The drain box (3-3) has a clean water outlet (3-13) on the back plate of the clean water zone (3-11).

8. The wastewater purification device for wet waste according to claim 1, characterized in that: The drain box (3-3) is also equipped with a flushing pipe (3-4) with a shut-off valve. The outlet of the flushing pipe (3-4) is located at the rear baffle (3-121) of the partition (3-12) and is reversed to the drain outlet (3-17).

9. The wastewater purification device for wet waste according to claim 1, characterized in that: It also has a support platform (4), which is connected and fixed to multiple support legs (4-1) via a support frame (4-2). The centrifugal dewatering machine (1) is installed on the rear of the support platform (4), and the drain box (3-3) is located at the lower front of the support platform (4). The slag discharge pipe (1-4) of the centrifugal dewatering machine (1) is vertically arranged.

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