A sewage filtering scum treatment device

Abstract

The application belongs to the field of sewage treatment, and particularly relates to a sewage filtering scum treatment device which comprises a separation assembly, a purification assembly and a power assembly, the separation assembly comprises a screw rod and a sleeve coaxially arranged, the sleeve is sleeved on the outer side of the screw rod, the purification assembly comprises activated sludge and a biological purification tank for carrying the activated sludge, and the power assembly is used for driving the screw rod to rotate; the separation assembly is sequentially divided into a grinding section, a separation section and a water distribution section along the axial direction of the screw rod, the water distribution section is submerged in the activated sludge; the end face of the sleeve close to the water distribution section is closed, the end face away from the water distribution section is a scum outlet, the side wall of the sleeve in the water distribution section is uniformly provided with water distribution holes, and the side wall in the separation section is provided with a feeding port. The application has the effects of solid-liquid separation on the scum and harmless treatment of the percolate.

Description

TECHNICAL FIELD

[0001] The present application relates to the sewage treatment field, in particular to a sewage filtering scum treatment device. BACKGROUND

[0002] In the sewage treatment process, the scum separated by pretreatment still contains a lot of water, and the water contains a large amount of organic matter and nitrogen compounds. If not treated additionally, it will affect the subsequent recycling and reuse of the scum.

[0003] At present, for the scum separated by pretreatment, a centrifugal method is usually used to obtain garbage leachate and dry filter residue, and then the garbage leachate is treated harmlessly and discharged, and the filter residue is recycled and reused.

[0004] However, both the centrifuge and the leachate harmless treatment equipment need a large space to be placed, and the setting of the two treatment processes also increases the cost of garbage treatment, so a device for solid-liquid separation of scum while harmlessly treating leachate is needed. SUMMARY

[0005] In order to solve the problems in the related art and reduce the garbage treatment process, the present application provides a sewage filtering scum treatment device.

[0006] The sewage filtering scum treatment device provided by the present application adopts the following technical scheme:

[0007] A sewage filtering scum treatment device, comprising a separation assembly, a purification assembly and a power assembly, the separation assembly comprising a screw and a sleeve coaxially arranged, the sleeve being sleeved on the outside of the screw, the purification assembly comprising activated sludge and a biological purification tank carrying the activated sludge, and the power assembly being used to drive the screw to rotate; the separation assembly is sequentially divided into a grinding section, a separation section and a water distribution section along the axial direction of the screw, and the water distribution section is submerged in the activated sludge;

[0008] The end face of the sleeve close to the water distribution section is closed, and the end face away from the water distribution section is a residue outlet, the side wall of the sleeve located in the water distribution section is uniformly provided with water distribution holes, and the side wall located in the separation section is provided with a feeding port.

[0009] By adopting the above technical scheme, when the scum enters the device from the feeding port, the solid is pushed by the screw and moves in the sleeve towards the residue outlet. In the moving process, the leachate is separated from the filter residue due to the action of gravity, the filter residue is output from the discharge port and collected and utilized by the subsequent process; the leachate flows downward along the sleeve, flows into the water distribution section, and is no longer subjected to the downward gravity potential because the water distribution section is submerged in the activated sludge, and then is pushed by the rotating screw and is thrown out from the water distribution hole, and is mixed with the activated sludge and then is purified.

[0010] Preferably, the screw rod comprises a first screw rod and a second screw rod coaxially connected, the first screw rod is arranged in the separation section and the grinding section, and the second screw rod is arranged in the water distribution section, and the first screw rod and the second screw rod have different screw line types.

[0011] By adopting the technical scheme, the first screw rod is used for conveying the solid filter residue to the residue outlet, and the second screw rod is used for spreading the leachate into the biological purification tank; the standard screw rod is mainly used for applying force to the conveying object or gear along the axial direction of the screw rod, and the second screw rod is selected to have a different screw line type, so that the leachate can be better dispersed in the activated sludge and uniformly mixed.

[0012] Preferably, the first screw rod and the second screw rod are detachably connected and meshed with each other, and the power assembly is torsionally connected with the first screw rod.

[0013] By adopting the technical scheme, the first screw rod continuously performs the conveying of the floating residue and the solid-liquid separation, and the second screw rod can be designed to be intermittently started; when the second screw rod is meshed with the first screw rod, the screw rod spreads the leachate while whipping the liquid surface to roll air, especially oxygen in the air, into the liquid to supply oxygen to the activated sludge, so that the activated sludge performs aerobic reaction, rapidly proliferates, and absorbs organic matters; when the second screw rod is disengaged from the first screw rod, the first screw rod keeps rotating while the second screw rod stops whipping the liquid surface, so that the input of external oxygen is lost, the oxygen content in the biological reaction tank gradually decreases, and the activated sludge performs anaerobic reaction.

[0014] Preferably, the first screw rod is a double-head screw rod, two screw lines of the double-head screw rod are a first screw line and a second screw line respectively, a tooth crest line of the first screw line abuts against the inner wall of the sleeve, and a tooth crest line of the second screw line has a gap with the inner wall of the sleeve.

[0015] By adopting the technical scheme, the first screw line can perform self-cleaning on the inner wall of the sleeve to prevent the accumulation of dirt on the wall and reduce the difficulty of manual cleaning; when the filter residue interacts with the second screw line, the filter residue is rolled into the gap between the second screw line and the sleeve under the action of inertia, is ground at the same time, and the absorbed leachate is also squeezed out and flows to the water distribution section.

[0016] Preferably, the screw tooth of the second screw line is a rectangular screw tooth or a triangular screw tooth, the screw tooth is perpendicular to the axis at a position close to the axis, and the screw tooth gradually bends toward the water distribution section with the distance from the axis.

[0017] By adopting the technical scheme, when the filter residue is conveyed in the sleeve, the distance between the second screw line and the sleeve gradually decreases with the rotation of the screw rod, so that a better grinding and solid-liquid separation effect is achieved.

[0018] Preferably, the first screw rod has a gradually changing diameter, and the sleeve has a corresponding gradually changing diameter.

[0019] By using the above technical solution, when the filter residue is transported in the separation assembly, the space is compressed as it gets closer to the residue outlet, achieving better grinding and solid-liquid separation effect.

[0020] Preferably, the first screw rod has a gradually changing diameter, and the sleeve has a corresponding gradually changing diameter.

[0021] By using the above technical solution, when the filter residue is transported in the separation assembly, the space is compressed as it gets closer to the residue outlet, achieving better grinding and solid-liquid separation effect.

[0022] Preferably, the second screw rod has a helix angle less than 10°, or the helix of the second screw rod is parallel to the axis of the screw rod, or the second screw rod has the same direction as the first screw rod, for pressurizing the water distribution section of the sleeve.

[0023] By using the above technical solution, when the second screw rod has a helix angle less than 10° or the helix is parallel to the axis of the screw rod, the screw rod mainly exerts radial force on the liquid in the water distribution section when it rotates, which can better throw the leachate into the biological purification tank; when the second screw rod has the same direction as the first screw rod, the screw rod exerts axial force away from the residue outlet on the liquid when it rotates, pressurizing the leachate in the water distribution section of the sleeve, so that the leachate is sprayed into the biological purification tank under the action of pressure difference. The above three schemes can make the leachate carry more kinetic energy into the biological purification tank, achieving better mixing effect with the activated sludge.

[0024] Preferably, the screw rod is a double-end screw rod, and the screw thread of the screw rod is gradually changed at the junction of the first screw rod and the second screw rod.

[0025] By using the above technical solution, on the one hand, the transmission effect of the screw rod is ensured, and on the other hand, stress concentration at the junction of the first screw rod and the second screw rod is prevented.

[0026] Preferably, the second screw rod has a gradually changing diameter, and the sleeve has a corresponding gradually changing diameter.

[0027] By using the above technical solution, the proportion of the screw rod transmission range in the entire sleeve is ensured, preventing the formation of reverse turbulence between the screw rod and the sleeve due to too thin screw rod.

[0028] In summary, the present application has the following at least one beneficial technical effect:

[0029] 1. Through the design of the water distribution section, the separation section, and the grinding section, the floating sludge is subjected to dry-wet separation, at the same time, on the one hand, the filter residue is extruded and ground to output as dry fine filter residue, on the other hand, the percolate is introduced into the water distribution section, and the rotation of the screw provides kinetic energy for the percolate, so that the percolate is uniformly mixed with the activated sludge in the biological purification tank, and effective purification can be achieved without additional stirring process;

[0030] 2. The design of the first screw and the second screw, while keeping the first screw continuously running to separate and grind the floating sludge, can make the second screw run intermittently, when the second screw is running, the threads whip the liquid surface, input oxygen into the biological purification tank, so that the activated sludge undergoes aerobic reaction, when the second screw stops running, the oxygen content in the biological purification tank gradually decreases, and the reaction turns into anaerobic reaction, under the cooperation of the two phases, the organic matter content and the nitrogen content in the percolate can be effectively reduced, and mechanical stirring devices or pneumatic stirring devices in conventional biological purification tanks are not needed;

[0031] 3. The first screw and the second screw are detachably engaged, and while only one power source is used to ensure the operation of the first screw, the second screw is intermittently driven to run;

[0032] 4. The first screw is designed as a double-head screw, wherein the edge of the second screw is bent towards the water distribution section, which has a better grinding and extruding effect on the filter residue, and the first screw scrapes the residue on the inner wall of the sleeve to prevent the residue from adhering;

[0033] 5. As the first screw approaches the residue outlet, the pitch of the first screw gradually decreases, and the diameter of the sleeve also decreases, the space between every two adjacent threads is compressed, and a better grinding and extruding effect is achieved;

[0034] 6. The second screw is provided with different thread types, so that the percolate in the sleeve is thrown out or pressurized to be sprayed out, and a more uniform mixing effect with the activated sludge is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is a structural schematic view of a sewage filter floating sludge treatment device of embodiment 1 of the present application, omitting the power assembly and the activated sludge;

[0036] Figure 2 is a cross-sectional schematic view of a separation assembly of embodiment 1 of the present application;

[0037] Figure 3 is a structural schematic view of a screw of embodiment 1 of the present application;

[0038] Figure 4 is a structural schematic view of a screw of embodiment 2 of the present application.

[0039] REFERENCE SIGNS:

[0040] 1, screw; 11, first screw; 111, first helix; 112, second helix; 12, second screw; 2, sleeve; 21, slag outlet; 22, water distribution hole; 23, feed inlet; 3, biological purification tank. DETAILED DESCRIPTION

[0041] The following description will be made in conjunction with the accompanying drawings Figures 1-4 The present application is further described in detail.

[0042] The floating sludge separated from the sewage in the pretreatment process still has a high water content, and if it is not treated, it will precipitate leachate in the subsequent treatment process, affecting the effect of recycling and reprocessing. The common treatment method at present is to use centrifugal method to obtain dry filter residue and leachate, and then to treat the two parts separately, and the treatment of leachate needs to consume a large amount of resources, including space resources for placing related equipment and human resources for additional steps.

[0043] Based on the above status quo, the sewage filtering floating sludge treatment device is disclosed to achieve the effect of dry and wet separation while treating sewage.

[0044] Embodiment 1

[0045] Reference Figure 1 The sewage filtering floating sludge treatment device comprises a separation assembly, a purification assembly and a power assembly. The separation assembly comprises a sleeve 2 and a screw 1, the sleeve 2 is sleeved on the screw 1, and the two are coaxially arranged; the purification assembly comprises activated sludge and a biological purification tank 3, the activated sludge is arranged in the biological purification tank 3 by biological membrane method or activated sludge method; and the power assembly is used for driving the rotation of the screw 1. The separation assembly is divided into a grinding section, a separation section and a water distribution section arranged in sequence along the axial direction of the screw 1, the separation assembly is obliquely inserted or vertically inserted into the biological purification tank 3, and the water distribution section is submerged by the activated sludge.

[0046] The end face of the sleeve 2 close to one end of the water distribution section is closed, and the end face close to one end of the grinding section is opened as a slag outlet 21; the side wall of the sleeve 2 at the water distribution section part is provided with uniformly distributed water distribution holes 22, and optionally, a plurality of water distribution grooves distributed along the radial direction are also provided on the above-mentioned closed end face; the side wall of the sleeve 2 at the separation section part is provided with a feed inlet 23 away from the biological purification tank 3.

[0047] The sleeve 2 is fixedly connected with the biological purification tank 3, and the screw 1 is driven by the power assembly to rotate clockwise relative to the sleeve 2.

[0048] The screw 1 comprises a first screw 11 and a second screw 12, which can be independently operated and stopped. The first screw 11 is arranged in the grinding section and the separation section, the second screw 12 is arranged in the water distribution section, and the first screw 11 and the second screw 12 are both double-head screws 1, and the junctions of the two are smoothly transitioned.

[0049] The first screw rod 11 comprises two screw lines, i.e., a first screw line 111 and a second screw line 112, which are uniformly distributed but have different line types. The screw direction of the first screw rod 11 is opposite to the turning direction, and the specific conditions are as follows:

[0050] The cross section of the first screw line 111 on the plane passing through the axis of the first screw rod 11 is a triangle with the middle line perpendicular to the axis. The length of the side of the triangle close to the axis is recommended to be 10% of the lead of the first screw rod 11, and the angle opposite to the side of the triangle is in abutment with the sleeve 2. In another embodiment of the present embodiment, the cross section of the first screw line 111 on the plane passing through the axis of the first screw rod 11 is a right-angled triangle. One of the right-angled sides is in abutment with the axis of the first screw rod 11, the opposite angle of the right-angled side is in abutment with the sleeve 2, and the other right-angled side is one of the remaining two sides close to the slag outlet 21.

[0051] The cross section of the second screw line 112 on the plane passing through the axis of the first screw rod 11 is a curved triangle. One of the sides is in abutment with the axis of the first screw rod 11. The part of the middle line corresponding to the side close to the axis of the first screw rod 11 is a straight line perpendicular to the axis. As the middle line is away from the axis, the middle line is curved close to the water distribution section. The remaining two sides of the triangle are also curved. One of the sides close to the slag outlet 21 is parallel to the axis of the first screw rod 11 at the end away from the axis, and there is a gap between the side and the inner wall of the sleeve 2. In another embodiment of the present embodiment, the cross section of the second screw line 112 on the plane passing through the axis of the first screw rod 11 is a fan ring. One of the straight sides of the fan ring is fixedly connected with the axis of the first screw rod 11, and the center of the fan ring is located on the side of the straight side close to the water distribution section.

[0052] Optionally, in the grinding section, any one or both of the pitch of the first screw rod 11 and the diameter of the addendum circle gradually decreases as the distance from the slag outlet 21 decreases. When the diameter of the addendum circle of the first screw rod 11 changes, the diameter of the inner wall of the sleeve 2 is correspondingly changed to match the diameter of the addendum circle, and the thickness of the wall of the sleeve 2 remains unchanged.

[0053] The screw line of the second screw rod 12 is parallel to the axis of the second screw rod 12, or the helix angle is less than 10°. The diameter of the addendum circle of the second screw rod 12 is equal to the inner diameter of the sleeve 2, or there is a gap between the diameter of the addendum circle of the second screw rod 12 and the inner diameter of the sleeve 2, and the gap is less than or equal to 20% of the total tooth height of the second screw rod 12.

[0054] It should be noted that the turning direction of the screw rod 1 and the screw direction of the screw line in the present embodiment are designed for the geostrophic deflection force in the northern hemisphere. If the screw rod 1 is applied to the southern hemisphere, the turning direction of the screw rod 1 is preferably counterclockwise, and the screw thread should be adjusted accordingly.

[0055] Optionally, the first screw rod 11 and the second screw rod 12 are detachably meshed, specifically, the first screw rod 11 and the second screw rod 12 abut and are provided with meshing teeth matched with each other on the abutting surface, the first screw rod 11 is provided with a through hole along the axis thereof, the shaft of the second screw rod 12 extends as a through shaft in the direction close to the first screw rod 11, and the through shaft penetrates the through hole of the first screw rod 11. The power assembly is torsionally connected with the first screw rod 11, when the through shaft is pulled out in the direction away from the water distribution section, the first screw rod 11 is meshed with the second screw rod 12; when the through shaft is pushed in the direction close to the water distribution section, the second screw rod 12 is disengaged from the first screw rod 11.

[0056] The implementation principle of the embodiment 1 is as follows:

[0057] When the solid-liquid mixed scum enters the sleeve 2 from the feed port 23, the solid filter residue is pushed and moves along the sleeve 2 to the residue outlet 21 under the rotation of the screw rod 1, in the moving process, the filter residue is ground and extruded by the first screw rod 11, especially the second screw line 112, and then is output from the residue outlet 21 in the form of small pieces of filter residue; the percolate is separated from the filter residue and is guided to the water distribution section by the sleeve 2 under the action of gravity, and then is agitated by the screw rod 1 and is thrown out from the water distribution hole 22 under the action of centrifugal force, mixed with the active sludge in the biological purification tank 3, and after aerobic reaction and anaerobic reaction, the content of organic matter and nitrogen compounds is greatly reduced, achieving the effect of preliminary purification.

[0058] Specifically, the filter residue is affected by the two screw lines of the first screw rod 11 and the sleeve 2. In the process of being transported to the residue outlet 21, the first screw line 111 abuts against the sleeve 2 to scrape off the dirt adhered to the inner wall of the sleeve 2; the screw teeth of the second screw line 112 are bent towards the water distribution section, when the filter residue is pushed by the second screw line 112, under the action of gravity and inertia, the filter residue is squeezed into the gap between the second screw line 112 and the sleeve 2, is extruded and ground by the gradually narrowing gap, on the one hand, the percolate in the filter residue is squeezed out, achieving better solid-liquid separation effect, on the other hand, the large filter residue is ground into small pieces of filter residue, facilitating the recycling in the subsequent process.

[0059] The percolate flows into the water distribution section along the sleeve 2, is agitated by the second screw rod 12, forms a vortex in the sleeve 2, and then is thrown out by the centrifugal force, enters the biological purification tank 3 through the water distribution hole 22, and is mixed with the active sludge.

[0060] In addition, the rotating second screw rod 12 simultaneously stirs the liquid surface in the sleeve 2, mixes air, especially oxygen in the air, into the percolate, and the percolate enters the biological purification tank, increasing the oxygen content in the active sludge, and the high-speed thrown percolate also agitates the liquid surface of the biological purification tank 3, so that oxygen is rolled in, increasing the oxygen content in the active sludge. Under the premise that the oxygen supply is sufficient, the active sludge performs aerobic reaction, consumes organic matter to proliferate rapidly, and performs nitrification reaction to absorb ammonia nitrogen.

[0061] When the mandrel is pushed towards the water distribution section, the engagement between the second screw 12 and the first screw 11 is broken, the first screw 11 keeps rotating, while the second screw 12 gradually stops rotating, the dissolved oxygen in the activated sludge is gradually consumed, and the anaerobic environment is formed, and the anaerobic reaction represented by the denitrification reaction dominates.

[0062] Embodiment 2

[0063] With reference to Figure 4 The difference between this embodiment and embodiment 1 is that the screw direction of the second screw 12 is opposite to that of the first screw 11.

[0064] Specifically, the screw direction and the rotation direction of the second screw 12 are both clockwise.

[0065] The implementation principle of embodiment 2 is as follows:

[0066] When the second screw 12 rotates, the screw 1 and the leachate in the water distribution section sleeve 2 move relatively, and an axial force away from the first screw 11 is applied to the leachate. Because the end face of the sleeve 2 at one end of the water distribution section is closed, the leachate in the sleeve 2 is compressed, the hydraulic pressure is raised, and then released through the water distribution hole 22 and the water distribution groove. The leachate is sprayed into the biological purification tank 3 from the water distribution hole 22 and the water distribution groove under the action of the pressure difference, and mixed with the activated sludge.

[0067] In addition, under the action of the geostrophic deflection force in the northern hemisphere, the liquid has a spontaneous tendency to form a counterclockwise vortex, which further increases the relative motion between the leachate and the second screw 12, and the pressure difference is further increased. The leachate enters the biological purification tank 3 with higher kinetic energy, achieving better mixing effect and purification effect.

[0068] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A sewage filtering scum treatment device, characterized by: The utility model provides a sewage treatment device, comprising a separation assembly, a purification assembly and a power assembly, the separation assembly comprises a screw (1) and a sleeve (2) arranged coaxially, the sleeve (2) is sleeved on the screw (1), the purification assembly comprises activated sludge and a biological purification tank (3) for carrying the activated sludge, and the power assembly is used for driving the screw (1) to rotate, the separation assembly is sequentially divided into a grinding section, a separation section and a water distribution section along the axial direction of the screw (1), and the water distribution section is submerged in the activated sludge, The end face of the sleeve (2) close to the water distribution section is closed, and the end face away from the water distribution section is a slag outlet (21), the side wall of the sleeve (2) in the water distribution section is uniformly provided with water distribution holes (22), and the side wall in the separation section is provided with a feeding port (23). The screw (1) comprises a first screw (11) and a second screw (12) connected coaxially, the first screw (11) is arranged in the separation section and the grinding section, the second screw (12) is arranged in the water distribution section, the first screw (11) and the second screw (12) have different screw line types, the first screw (11) and the second screw (12) are detachably connected and meshed with each other, and the power assembly is torsionally connected with the first screw (11). The first screw (11) is a double-head screw (1), two screw lines of the double-head screw (1) are a first screw line (111) and a second screw line (112), the tooth crest line of the first screw line (111) abuts against the inner wall of the sleeve (2), and the tooth crest line of the second screw line (112) has a gap with the inner wall of the sleeve (2). The helix angle of the second screw (12) is less than 10°, or the screw line of the second screw (12) is parallel to the axis of the screw (1), or the screw direction of the second screw (12) is the same as the turning direction, for pressurizing the water distribution section of the sleeve (2).

2. The sewage filtering scum treatment device according to claim 1, characterized in that: The screw tooth of the second screw line (112) is a rectangular screw tooth or a triangular screw tooth, the screw tooth is perpendicular to the axis at a position close to the axis, and gradually bends towards the water distribution section with the distance from the axis.

3. The sewage filtering scum treatment device according to claim 1, characterized in that: The tooth crest circle diameter of the first screw (11) decreases with the approach to the slag outlet (21), and the sleeve (2) is correspondingly gradually changed to cooperate with the first screw (11).

4. The sewage filtering scum treatment device according to claim 1, characterized in that: The pitch of the first screw (11) decreases with the approach to the slag outlet (21).

5. The sewage filtering scum treatment device according to claim 1, characterized in that: The screw (1) is a double-head screw (1), and the screw tooth is gradually changed at the junction of the first screw (11) and the second screw (12).

6. The sewage filtering scum treatment device according to claim 1, characterized in that: The tooth crest of the second screw (12) abuts against the sleeve (2), or the distance between the tooth crest of the second screw (12) and the inner wall of the sleeve (2) is less than 20% of the full tooth height.

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