WO2012075682A1

WO2012075682A1 - Solid-liquid separation device and use thereof in wastewater treatment

Info

Publication number: WO2012075682A1
Application number: PCT/CN2011/002048
Authority: WO
Inventors: 李进民; 周连奎; 李大勇
Original assignee: Li Jinmin; Zhou Liankui; Li Dayong
Priority date: 2010-12-08
Filing date: 2011-12-08
Publication date: 2012-06-14
Also published as: CN102557326A; CN102557326B

Abstract

Provided is a solid-liquid separation device, comprising a settlement separation region (21), a mixed solution distribution region (22) disposed below the settlement separation region (21), and a mixed solution concentration region (23) disposed below the mixed solution distribution region (22). The bottom of the settlement separation region (21) is defined by an upper surface of a first inverted V-shaped plate (3); the top of the mixed solution distribution region (22) is defined by a lower surface of the first inverted V-shaped plate (3), the bottom of the mixed solution distribution region (22) is defined by an upper surface of a second inverted V-shaped plate (4), and a mixed solution distributor (1) allowing the mixed solution to enter is further disposed in the mixed solution distribution region (22); and the top of the mixed solution concentration region (23) is defined by a lower surface of the second inverted V-shaped plate (4). A wastewater treatment apparatus comprising an anaerobic treatment section, an aerobic treatment section and the solid-liquid separation device is further provided, which has the advantages of good effluent quality, high volume load, reduced floor area, low sludge production, and little influence on ambient environment.

Description

The present invention claims priority from Chinese Patent Application No. 201010578850. The filing date is December 8, 2010. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid-liquid separation device, and more particularly to a solid-liquid separation device having a mixed liquid distribution region defined by a first inverted V-shaped plate and a second inverted V-shaped plate. The invention also relates to a sewage treatment apparatus comprising the solid-liquid separation device. BACKGROUND OF THE INVENTION Generally, the aerobic biological treatment of sewage can obtain good water quality, but it is easy to produce sludge expansion, and the anaerobic treatment section before aerobic treatment can avoid sludge expansion. The sludge in the system is automatically returned to the sludge-sewage mixing zone in the sedimentation zone, which increases the sludge concentration in the mixing zone and ensures the low-load operation of the system to keep the activated sludge of the aeration system in a relatively high MLSS condition. The equilibrium state makes the SRT tend to infinity, which can make the remaining sludge reach zero emissions. The combination of aerobic treatment and anaerobic treatment is particularly suitable for some large installations. However, such a combination is often unattractive in small devices because the benefits are often not able to compensate for the increased investment and because of the larger footprint required. The raft device and the anaerobic device are arranged perpendicular to each other, for example in the same column. Although the combination of aerobic treatment and anaerobic treatment is also suitable for small devices, the tower device is generally tall and difficult to bury underground. Therefore, noise and impact on the landscape during operation may limit its application. In addition, open-air installations are also more susceptible to ambient temperatures. Therefore, there is still a need for improved sewage treatment plants, particularly sewage treatment devices that can be buried underground to meet various needs in different situations. SUMMARY OF THE INVENTION In one aspect, the present invention provides a solid-liquid separation device comprising a sedimentation separation zone, a mixed liquid distribution zone disposed below the sedimentation separation zone, and a concentrated mixed liquor zone disposed below the mixed liquor distribution zone, wherein the sedimentation separation zone The upper portion is provided with a supernatant outlet, and the bottom of the sedimentation separation zone is defined by the upper surface of the first inverted V-shaped plate; the top of the mixed liquid distribution zone is defined by the lower surface of the first inverted V-shaped plate, and the bottom of the mixed liquid distribution zone Defined by the upper surface of the second inverted V-shaped plate, the mixed liquid distribution area is further provided with a mixed liquid distributor for allowing the mixed liquid to enter the mixed liquid distribution area, and the first inverted V-shaped plate and the inner wall of the solid-liquid separating device have a first passage allowing fluid to communicate with the settling separation zone and the mixed liquor distribution zone; the top of the concentrated mixed liquor zone is defined by the lower surface of the second inverted V-shaped plate, and the concentrated mixed liquor zone is further provided with a concentrated mixed liquor outlet, the second inverted V The shaped plate has a second passage between the inner wall of the solid-liquid separation device that allows fluid communication with the mixed liquid distribution zone and the concentrated mixed liquid zone. Some embodiments of the solid-liquid separation device according to the present invention, wherein the ridges of the first inverted V-shaped plate and the ridges of the second inverted V-shaped plate are substantially parallel to each other, some embodiments of the solid-liquid separation device according to the present invention Wherein the mixed liquor distribution zone has an inverted V-shaped cross section. According to some embodiments of the solid-liquid separation device of the present invention, one or more supports may be disposed between the first inverted V-shaped plate and the second inverted V-shaped plate. Some embodiments of the solid-liquid separation device according to the present invention, wherein the first inverted V-shaped plate and the second inverted V-shaped plate each have 15 independently. -165. , preferably 45. -135. More preferably 60. -120. More preferably 75. -105. The angle is, for example, about 90. The angle of the. Some embodiments of the solid-liquid separation device according to the present invention, wherein the first passage is a first slit substantially parallel to a ridge of the first inverted V-shaped plate, and the second passage is opposite to the second The second slit having substantially parallel ridges of the V-shaped plate, preferably the first slit and the second slit are substantially parallel to each other, and more preferably the first slit is wider than the second slit. Some embodiments of the solid-liquid separation device according to the present invention, wherein the mixed liquid distributor is disposed such that the mixed liquid entering the settling separation zone through the first passage has substantially the same flow rate throughout the first passage. Some embodiments of the solid-liquid separation device according to the present invention, wherein the mixed liquid distributor is one or more water distribution pipes having one or more openings in the mixed liquid distribution region, preferably the water distribution pipe and the first inverted V-shaped plate The ridges and/or the ridges of the second inverted V-shaped plate are parallel, more preferably the water conduit is the ridge of the first inverted V-shaped plate and/or the ridge of the second inverted V-shaped plate. According to some embodiments of the solid-liquid separation device of the present invention, one or more supports may be disposed between the mixed liquid distributor and the first inverted V-shaped plate and/or the second inverted V-shaped plate. According to some embodiments of the solid-liquid separation device of the present invention, a sloping plate or a inclined tube is further provided in the settling separation zone to enhance solid-liquid separation efficiency. Some embodiments of the solid-liquid separation device according to the present invention, wherein a gas distributor is disposed at a bottom of the concentrated mixed liquid zone to allow the concentrated mixed liquid in the concentrated mixed liquid zone to be agitated while the gas is floating, preferably a gas distributor and a second pouring The V-shaped plate is configured such that substantially all of the gas accumulates below the second inverted V-shaped plate after the gas floats and the solid-liquid separation device is led along the lower surface of the second inverted V-shaped plate. In some cases, a sloping plate extending from the inner wall of the solid-liquid separating device to below the second inverted V-shaped plate may be disposed below the second passage to ensure that the gas does not enter the mixed liquid distribution region through the second passage after the gas is floated or Entering the solid-liquid separation zone through the first passage. In another aspect, the present invention provides a sewage treatment apparatus including an anaerobic treatment section, an aerobic treatment section, and any of the above-described anaerobic treatment section and an aerobic treatment section. The solid-liquid separation device of one embodiment, wherein the anaerobic treatment section is provided with a sewage feed pipe and an anaerobic treatment mixed liquid outlet, and the anaerobic treatment mixed liquid outlet is in fluid communication with the concentrated mixed liquid zone of the solid-liquid separation device to allow disgusting The mixed solution of the oxygen treatment section enters the concentrated mixed liquor zone, and the outlet of the concentrated mixed liquor zone is in fluid communication with the aerobic treatment section to allow the concentrated mixed liquor of the concentrated mixed liquor zone and the optional gas to enter the aerobic treatment section, the aerobic treatment section The bottom of the mixture is provided with one or more aeration devices and the top is provided with a mixed liquid lifting device, and the upper portion of the mixed liquid lifting device is provided with a gas-liquid separating device to allow separation of the aeration gas and the aeration mixture through the mixed liquid lifting device. The gas-liquid separation device is provided with a gas outlet and an aeration mixture outlet, and the aeration mixture outlet is in fluid communication with the anaerobic treatment section and the solid-liquid separation device, respectively, to allow the first partial aeration mixture to enter the anaerobic treatment section and allow the second Part of the aeration mixture enters the solid-liquid separation device, and preferably the aeration mixture outlet is in fluid communication with the sewage feed pipe and the mixed liquid distributor, respectively. According to some embodiments of the sewage treatment apparatus of the present invention, wherein the mixed liquid lifting device is provided with a gas redistributor to allow the aeration gas and the aeration mixture to be further mixed in the mixed liquid lifting device, preferably the gas redistributor is Or multiple aeration devices. When the small bubbles leaving the aeration device gradually condense into larger bubbles in the aerobic reaction section, the gas redistributor can disperse the large bubbles into small bubbles, thereby more fully utilizing the oxygen in the bubbles. The efficiency of the aerobic reactor is increased. The gas redistributor thus arranged not only improves the utilization rate of the oxygen-containing gas and the efficiency of the aerobic reaction, but also functions as a buffer for energy dissipation. Since the kinetic energy of the material is reduced when passing through the gas redistributor and the large bubbles therein are again dispersed into small bubbles, the bubbles leaving the gas redistributor can gently and smoothly escape the liquid surface, facilitating the separation and discharge of the gas. In some cases, the gas that escapes smoothly from the liquid level can be directly discharged without the need for a buffer chamber, saving investment, operating and maintenance costs. Some embodiments of a sewage treatment device according to the present invention, wherein the solid-liquid separation device The bottom of the concentrated mixed liquor zone is provided with a gas distributor, preferably the gas distributor is one or more aerators. Some embodiments of the sewage treatment apparatus according to the present invention, wherein the solid-liquid separation apparatus is disposed between the anaerobic treatment section and the aerobic treatment section. According to some embodiments of the sewage treatment apparatus of the present invention, wherein the anaerobic treatment section, the solid-liquid separation section, and/or the aerobic treatment section are a cylinder or a square cylinder, preferably the anaerobic treatment section, solid-liquid treatment The separation section and the aerobic treatment section together form a cylindrical body or a square cylinder. Some embodiments of the sewage treatment apparatus according to the present invention, wherein the aeration apparatus is preferably any suitable aerator, such as a spiral aerator, a microporous aerator, a plate aerator, a rotary aeration aerator, a tube Type aerator, jet aerator, etc. Preference is given to using some embodiments of a sewage treatment device according to the invention, such as a fixed spiral aerator, a fixed single screw aerator, a fixed double screw aerator or a fixed triple screw aerator, wherein at the top of the anaerobic treatment section A gas discharge device is provided to discharge the gas produced in the anaerobic treatment section. Some embodiments of the sewage treatment apparatus according to the present invention, wherein at least a portion, and preferably all, of the sewage treatment devices are buried underground to save land, reduce noise and avoid impact on the landscape. The sewage biological treatment device of the invention also has the advantages of good effluent water quality, high volume load, saving land occupation, low sludge production, and little impact on the surrounding environment. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic cross-sectional view of one embodiment of a solid-liquid separation device according to the present invention. Fig. 2 is a schematic structural view showing an embodiment of a sewage treatment apparatus according to the present invention, wherein the solid-liquid separation section (S2) is the solid-liquid separation apparatus shown in Fig. 1. The embodiments of the present invention are further described below with reference to the accompanying drawings, but are not intended to limit the scope of the present invention. 2 is a schematic structural view of an embodiment of a sewage treatment apparatus according to the present invention, wherein the sewage treatment apparatus includes an anaerobic treatment section (S1), a solid-liquid separation section (S2), and an aerobic treatment section (S3), And Figure 1 shows a schematic cross section of the solid-liquid separation section (S2). The sewage feed as the influent enters the anaerobic treatment section (S1) through the sewage feed pipe together with the first partial aeration mixture (9) from the mixed liquid lifting device (11), and the anaerobic mixture passes through the anaerobic treatment The oxygen treatment mixture outlet (6) enters the concentrated mixture zone (Z3) of the solid-liquid separation section (S2), and the anaerobic treatment mixture is concentrated and mixed with the sedimentation separation zone (Z1) in the concentrated mixture zone (Z3). The liquid is mixed and aerated by the aerator (5) as a gas distributor, and then passed through the concentrated mixture outlet (7) to enter the ammonia treatment section (S3) while concentrating the gas in the mixed zone (Z3) Also entering the aerobic treatment section (S3), the aerated mixture after the aeration treatment and the gas in the aerobic treatment section (S3) are introduced into the gas-liquid together through the liquid mixture lifting device (10) provided with the gas redistributor The gas-liquid separation device (11) is separated to separate the gas and the aeration mixture, and then the first portion of the aeration mixture (9) enters the anaerobic treatment section (S1) together with the influent water, and the second partial aeration mixture (8) a mixed liquid distributor (1) entering the solid-liquid separation section (S2), wherein The ratio of a portion of the aerated mixture (9) to the second portion of the aeration mixture (8) can be controlled by a flow regulating valve (12). The mixture entering the mixed liquid distributor (1) consisting of one or more water distribution pipes uniformly enters the first inverted V-shaped plate (3) and the second inverted V-shaped plate through one or more openings (2) ( 4) A defined mixed liquid distribution zone (Z2), which then enters the sedimentation separation zone (Z1) through a slit between the first inverted V-shaped plate (3) and the inner wall of the solid-liquid separation device. Settlement After separation from the zone (1), the supernatant is discharged as effluent through the overflow tank (13). The concentrated mixture in the lower part of the sedimentation separation zone (1) passes through the slit between the first inverted V-shaped plate (3) and the second inverted V-shaped plate (4) and the inner wall of the solid-liquid separation device into the concentrated mixed liquid zone (Z3 ). The concentrated mixture and the mixture from the anaerobic treatment section are agitated by the gas from the aerator (5) in the concentrated mixed liquor zone (Z3), thereby being uniformly mixed and pushed into the aerobic treatment section under the push of the gas. (S3). In the sewage treatment apparatus shown in Fig. 2, the top of the anaerobic treatment section (S1) is further provided with an exhaust valve (14) to discharge any gas generated in the anaerobic treatment section (S1). In the sewage treatment apparatus shown in Fig. 2, the anaerobic treatment section (S1), the solid-liquid separation section (S2), and the aerobic treatment section (S3) have the same diameter and together constitute a cylindrical body. In the sewage treatment apparatus shown in Fig. 2, the gas for aeration treatment is finally discharged through the mixed liquid lifting device (10) and the gas-liquid separation device (11), thereby driving the mixed liquid in the entire sewage treatment device. The cycle, thus making full use of the energy of the gas, reduces the energy consumption of the entire sewage treatment plant. In some cases, the water intake of the first partial aeration mixture (9) may be at any position in the gas-liquid separation device (11), preferably at or slightly above the level of the supernatant in the sedimentation separation zone (Z1). s position. Further, the sewage treatment apparatus shown in Fig. 2 is in a horizontal arrangement, which reduces the height of the entire apparatus, and at the same time, the separation, mixing and transportation of the mixed liquid are compactly integrated due to the use of the solid-liquid separation apparatus according to the present invention. The land occupation is reduced, the structure is simplified, and the maintenance is facilitated. Therefore, the sewage treatment device can be buried underground, which is advantageous for saving land, maintaining temperature and beautifying the environment. The invention has been described above by way of illustration. However, it should be understood that this issue _ _ is not limited to these specific implementations. A person skilled in the art can make various modifications or changes to the invention, and such modifications and variations are within the scope of the invention.

Claims

Rights request

A solid-liquid separation device comprising a sedimentation separation zone, a mixed liquid distribution zone disposed below the sedimentation separation zone, and a concentrated mixed liquor zone disposed below the mixed liquor distribution zone, wherein the supernatant of the sedimentation separation zone is provided with a supernatant The outlet, the bottom of the settling separation zone is defined by the upper surface of the first inverted V-shaped plate; the top of the mixed liquid distribution zone is defined by the lower surface of the first inverted V-shaped plate, and the bottom of the mixed liquid distribution zone is composed of the second inverted V-shaped plate The upper surface defines that the mixed liquid distribution zone is further provided with a mixed liquid distributor that allows the mixed liquid to enter the mixed liquid distribution area, and the first inverted V-shaped plate and the inner wall of the solid-liquid separation device have a fluid separation connection separation zone and a first passage of the mixed liquid distribution zone; a top portion of the concentrated mixed liquid zone is defined by a lower surface of the second inverted V-shaped plate, the concentrated mixed liquid zone is further provided with a concentrated mixed liquid outlet, and the second inverted V-shaped plate and the solid-liquid separation device There is a second passage between the inner walls that allows fluid communication between the mixed liquor distribution zone and the concentrated mixed liquor zone.

The solid-liquid separating device according to claim 1, wherein a ridge of the first inverted V-shaped plate and a ridge of the second inverted V-shaped plate are substantially parallel to each other,

A solid-liquid separation device according to any one of the preceding claims, wherein the mixed liquid distribution zone has an inverted V-shaped cross section.

4. A solid-liquid separation device according to any one of the preceding claims, wherein the first passage is a first slit substantially parallel to the ridge of the first inverted V-shaped plate, and the second passage is a second inverted V-shaped Preferably, the first slit and the second slit are substantially parallel to each other, and more preferably the first slit is wider than the second slit.

5. A solid-liquid separation device according to any one of the preceding claims, wherein the mixed liquor distributor is arranged such that the mixed liquor entering the settling separation zone through the first passage has substantially the same flow rate throughout the first passage.

6. A solid-liquid separation device according to any one of the preceding claims, wherein the mixed liquid distributor is one or more water distribution pipes having one or more openings in the mixed liquid distribution zone, preferably the water distribution pipe and the first pouring The ridges of the V-shaped plate and/or the ridges of the second inverted V-shaped plate are parallel, more preferably the water conduit is the ridge of the first inverted V-shaped plate and/or the ridge of the second inverted V-shaped plate.

The solid-liquid separation device according to any one of the preceding claims, wherein a gas distributor is provided at the bottom of the concentrated mixed liquor zone to allow the concentrated mixture in the concentrated mixed liquor zone to be agitated while the gas is floating, preferably a gas distributor and The second inverted V-shaped plate is arranged such that substantially all of the gas accumulates below the second inverted V-shaped plate and leads the solid-liquid separation device along the lower surface of the second inverted V-shaped plate.

A sewage treatment apparatus comprising an anaerobic treatment section, an aerobic treatment section, and a solid-liquid separation apparatus according to any one of claims 1 to 7, wherein the anaerobic treatment section has a sewage feed pipe and an anaerobic treatment mixture The liquid outlet, the anaerobic treatment mixed liquid outlet is in fluid communication with the concentrated mixed liquid zone of the solid-liquid separation device to allow the mixed liquid of the anaerobic treatment section to enter the concentrated mixed liquid zone, and the outlet of the concentrated mixed liquid zone is in fluid communication with the aerobic treatment section. The aerated treatment liquid and the optional gas are allowed to enter the aerobic treatment section, the aerobic treatment section is provided with an aeration device at the bottom and the mixture liquid lifting device is arranged at the top, and the upper part of the mixed liquid lifting device is provided with gas. The liquid separation device is configured to allow separation of the aeration gas and the aeration mixture through the mixed liquid lifting device, the gas-liquid separation device is provided with a gas outlet and an aeration mixture outlet, and the aeration mixture outlet is respectively associated with the anaerobic treatment section and the solid solution The separation device is in fluid communication to allow the first portion of the aeration mixture to enter the anaerobic treatment section and allow the second portion of the aeration mixture to enter the solid-liquid separation device, Selected from the sewage aeration mixture outlet, respectively and the feed tube in fluid communication with the distribution of the mixture.

9. The sewage treatment device according to claim 8, wherein the mixed liquid lifting device A gas redistributor is provided to allow the aeration gas and the aeration mixture to be further mixed in the mixture lifting device, preferably the gas redistributor is a spiral aerator.

The sewage treatment apparatus according to claim 8 or 9, wherein said solid-liquid separation means is disposed between the anaerobic treatment section and the aerobic treatment section.

The sewage treatment apparatus according to any one of claims 8 to 10, wherein the anaerobic treatment section, the solid-liquid separation section, and/or the aerobic treatment section is a crucible body or a square cylinder, preferably the anaerobic The treatment section, the solid-liquid separation section and the aerobic treatment section together form a cylindrical body or a square cylinder.

The sewage treatment apparatus according to any one of claims 8 to 11, wherein at least a part, preferably all of said sewage treatment apparatuses are buried in the ground.