CN216808499U - Aerobic filtration system using woven filter media - Google Patents

Abstract

The present application relates to an aerobic filtration system using a textile filter medium, comprising: an aerobic filter and a water tank. The aerobic filter is arranged at the top of the water tank and is arranged up and down, and the aerobic filter is communicated with the water tank through a pipeline. Wherein the aerobic filter comprises a housing, a distribution manifold, a support bar and a filter medium. The water inlet has been seted up on the lateral wall of casing, and inside from last to having set gradually distribution manifold and bracing piece down, distribution manifold and water inlet intercommunication, the bracing piece is a plurality of, sets gradually along the length direction of casing. The filter medium is a textile sheet and is erected on the support rod, a preset distance is reserved between every two adjacent filter media within a range of 3.2-6.4 mm, the thickness of each filter medium is within a range of 3.81-4 mm, and the textile sheet has the characteristics of large surface area, effective opening area and low water holding capacity. Provides high quality effluent in a relatively small space, supports an aerobic environment conducive to biological growth, and provides nitrification of the septic tank supernatant.

Description

Aerobic filtration system using woven filter media

Technical Field

The application relates to the technical field of wastewater treatment, in particular to an aerobic filtering system using a textile filtering medium.

Background

Secondary treatment of septic tank supernatant is a typical aerobic treatment. In addition to reducing BOD (biochemical oxygen demand) and TSS (total suspended solids), the aerobic environment of secondary treatment also causes microorganisms (bacteria) to oxidize ammonia nitrogen to nitrate nitrogen, a process known as nitrification. Thus, in conventional systems, the nitrogen in the secondary treatment wastewater is primarily nitrate nitrogen. The secondary treatment wastewater is either discharged directly from the system or at least partially recycled through a recycle tank. The prior art textile materials have high specific surface areas (4331ft2/ft3), relatively low effective open area (85.6%) and high water holding capacity (73%) but fail to provide the desired treatment. The problem to be solved by those skilled in the art is how to provide high quality effluent in a relatively small space and support an aerobic environment that is conducive to biological growth to provide nitrification of the supernatant from the septic tank.

Disclosure of Invention

In view of the above, the present application provides an aerobic filtration system using a textile filter media that provides high quality effluent in a relatively small space and supports an aerobic environment conducive to biological growth to provide nitrification of the septic tank supernatant.

According to one aspect of the present application, there is provided an aerobic filter system using a textile filter medium, comprising an aerobic filter and a water tank; the aerobic filter is arranged at the top of the water tank and is arranged up and down, and the aerobic filter is communicated with the water tank through a pipeline; wherein the aerobic filter comprises a housing, a distribution manifold, a support bar and a filter medium; a water inlet is formed in the side wall of the shell, a distribution manifold and a support rod are sequentially arranged in the shell from top to bottom, and the distribution manifold is communicated with the water inlet; the number of the supporting rods is multiple, and the supporting rods are sequentially arranged along the length direction of the shell; the filter media are textile sheets and are erected on the supporting rods, and a preset distance is reserved between every two adjacent filter media; and the preset distance is within the range of 3.2 mm-6.4 mm.

In a possible implementation manner, the number of the distribution manifolds is more than two, and the more than two distribution manifolds are sequentially, uniformly and at intervals along the width direction of the shell.

In a possible implementation manner, nozzles are communicated with the distribution manifold, and the number of the nozzles is multiple and the nozzles are arranged along the distribution manifold in sequence; and are offset adjacent the nozzles on the distribution manifold.

In a possible implementation manner, the nozzle is vertically arranged, and the nozzle is downward and corresponds to the filtering medium up and down.

In one possible implementation, the thickness of the filter media ranges from 3.81 mm to 4 mm.

In a possible implementation manner, an air outlet is formed in the side wall of the shell, and the air outlet is communicated with the outside through a pipeline.

In a possible implementation manner, a liquid outlet is formed in the bottom of the shell, and the liquid outlet is communicated with a filtrate splitter; and the filtrate splitter is communicated with a first communicating pipe and a second communicating pipe, the first communicating pipe is communicated with the water tank, and the second communicating pipe is suitable for being communicated with a discharge field.

In a possible implementation manner, a water inlet is formed in one side wall of the water tank, is communicated with the outside through a pipeline and is suitable for receiving sewage; and a water outlet pump and a tubular filter are arranged on the other side of the water tank, and the water inlet, the water outlet pump and the water inlet are sequentially communicated.

In one possible implementation, the water outlet pump is connected with a switch assembly that includes a redundant on/off alarm float, a timer covering on/off float, and a timer covering on/off alarm float.

In a possible implementation manner, a junction box is arranged at the top of the water outlet pump, and the junction box is suitable for being connected with a control panel and used for controlling the switch assembly to be intermittently started.

The aerobic filter system using the textile filter medium has the advantages that: the combination of the aerobic filter and the water tank can provide high-quality effluent in a relatively small space and support an aerobic environment favorable for biological growth to provide nitrification of the supernatant of the septic tank.

Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the application and, together with the description, serve to explain the principles of the application.

FIG. 1 shows a schematic top view of the body structure of an aerobic filtration system using a woven filter media according to an embodiment of the present application;

FIG. 2 illustrates a front view of a body construction of an aerobic filtration system using a woven filter media according to an embodiment of the application;

FIG. 3 shows a schematic top view of the main structure of an aerobic filter according to an embodiment of the present application;

FIG. 4 is a schematic front view showing the main structure of an aerobic filter according to an embodiment of the present application;

FIG. 5 is a schematic side view showing the main structure of an oxygen filter according to an embodiment of the present application;

FIG. 6 shows a schematic view of a woven filter media of an embodiment of the present application;

fig. 7 shows a schematic side view of the main structure of an aerobic filtration system using a woven filter medium according to an embodiment of the present application.

Detailed Description

Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

It will be understood, however, that the terms "central," "longitudinal," "lateral," "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing or simplifying the description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.

Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present application. It will be understood by those skilled in the art that the present application may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present application.

Fig. 1 shows a schematic plan view of the main structure of an aerobic filter system of a woven filter medium 5 of an embodiment of the present application, fig. 3 shows a schematic plan view of the main structure of an aerobic filter of an embodiment of the present application, fig. 4 shows a schematic front view of the main structure of an aerobic filter of an embodiment of the present application, and fig. 5 shows a schematic side view of the main structure of an aerobic filter of an embodiment of the present application. As shown in fig. 1, 3, 4 and 5, the aerobic filter system of the woven filter media 5 of the embodiment of the present application includes an aerobic filter 23 and a water tank 11. The aerobic filter 23 is disposed on the top of the water tank 11, disposed up and down, and the aerobic filter 23 is communicated with the water tank 11 through a pipe. Among other things, aerobic filter 23 comprises a housing, distribution manifold 4, support rods 52 and filter media 5. The side wall of the shell is provided with a water inlet 1, the inside of the shell is sequentially provided with a distribution manifold 4 and a support rod 52 from top to bottom, and the distribution manifold 4 is communicated with the water inlet 1. The number of the support rods 52 is plural, and the support rods are arranged parallel to and spaced from the side wall of the housing. The filter media 5 are textile sheets 51, and are arranged on the support rods 52, and a preset distance is reserved between adjacent filter media 5. And the preset distance is within the interval of 3.2 mm-6.4 mm. So arranged, high quality effluent can be provided in a relatively small space, and an aerobic environment favorable for biological growth is supported to provide nitrification of the supernatant of the septic tank.

In one possible implementation, the conventional wisdom is reversed, in order to improve secondary treatment, to increase the effective open area of the woven fabric and reduce the water holding capacity, balancing the surface area with open area and water holding capacity. A variety of textile sheets used for filter media 5 were screened, as shown in the table below,

of these, the woven fabrics of nos. 3-7 performed satisfactorily, whereas the woven fabrics of nos. 1 and 2 were optimal. Among them, as for the water holding capacity, the capacity to reduce the water holding capacity may improve the aerobic filter 23. Without wishing to be bound by a particular theory, it is believed that water entering aerobic filter 23 does not displace water within filter media 5 if the water holding capacity is too high. It was found that with prior art textile media, the effluent from the septic tank that incorporates the aerobic filter 23 flows through the outside of the filter media (hydraulic tablets) rather than being treated by the filter media 5. The water holding capacity is reduced, so that the septic tank wastewater sprayed on the filter medium 5 enters the filter medium 5 and is treated. Therefore, even if the residence time is reduced, the treatment effect is improved. It is also believed that the high water holding capacity contributes to an anoxic condition that is not suitable for the aerobic environment required for secondary treatment. Thus, reducing the water holding capacity also contributes to improving the aerobic environment.

Referring to fig. 4 and 6, in one possible implementation, the textile sheet 51 may be in the form of a sheet or a chip. Preferably vertical hanging fins, may provide greater air flow around the filter media 5, provide more area for microorganisms, and may be subjected to higher loading rates.

Further, in one possible implementation, the textile sheet 51 has several properties that improve the function of the oxygen filter 23. The first and most important desired feature of textile sheet 51 is an effective open area greater than 86%. The effective open area is a relative measure of the pore size and is the percentage of the void volume in the textile sheet 51. The effective Open Area (OA) may be calculated by measuring the total volume occupied by textile sheet 51 (apparent density) minus the volume occupied by textile sheet 51 when it is an intact solid, according to a formula,

in one possible implementation, the effective open area is preferably greater than 88%, more preferably greater than 90%, and still more preferably greater than 95%. Second, the textile sheet 51 should have a water holding capacity of less than 73%. The water holding capacity can be determined as follows. The water tank 11 may be filled with a measured (weight) of the uncompacted textile sheet 51. The water tank 11 is filled with textile sheets 51 so that there are no spaces between the individual textile sheets. The water tank 11 is then filled with the measured (weight) water. The textile sheet 51 sample was removed and allowed to drain by gravity for 30 minutes. Water Holding Capacity (WHC) refers to the percentage of water remaining in the textile sheet 51, according to a formula,

in one possible implementation, the water holding capacity is preferably less than 50%, more preferably less than 35%, even more preferably less than 25%, most preferably less than 15%. A third desirable feature of textile sheet 51 is that it maximizes surface area while meeting the criteria of effective open area and water holding capacity. In general, for a given fiber size, as the surface area increases, the effective open area decreases and the water holding capacity increases. The Surface Area (SA) is determined by calculating the surface area of all of the fibers within a given volume of the non-compacted textile sheet 51. Generally, for textile sheet 51 having a denier of 6 or greater, the surface area should be less than 4300ft2/ft3 to meet the effective open area and water holding capacity criteria described above. According to the formula, the method comprises the following steps of,

(the denier is grams per 9000 meters of textile fiber and the fiber density and apparent density are expressed in pounds per cubic foot.)

Wherein for a textile fabric having a denier of 6 or greater, the surface area should be less than 4300ft2/ft3 to meet the effective open area and water holding capacity criteria described above. These textile properties provide improved support for microorganisms that oxidize organic materials present in wastewater during secondary treatment. Contrary to conventional wisdom, to improve secondary treatment, the effective open area of the textile sheet should be increased and the water holding capacity reduced. Conventional wisdom holds that surface area should be maximized to the greatest extent, but this results in an undesirably low open area and an undesirably high water holding capacity. While it is desirable to maximize surface area, the amount of surface area must be balanced against open area and water holding capacity. Furthermore, conventional wisdom holds that because the sand provides very small pore sizes, the open pore area should be relatively low to achieve good handling properties. However, for woven fabrics, a larger open area allows for significantly higher loading rates, yet still provides good handling properties. The larger open area also provides greater solids accumulation and prevents face plugging.

Referring to fig. 6, in the prior art, in which the width of the gap between the suspended filter media 5 is 8 mm, it is easy to allow the sewage sprayed from the nozzles 6 to completely pass through the adjacent gap, thereby preventing the filter media 5 from being treated. When too close together, there is a reduced air flow within aerobic filter 23, tending to allow biological growth to bridge between adjacent textile sheets 51 and cause clogging.

Further, in one possible implementation, the gap between adjacent textile sheets 51 should be sufficiently narrow so that the short circuit is not significant, and so that all of the effluent discharged through the manifold passes through textile sheets 51. Preferably less than 5%, and more preferably less than 1% of the waste water bypasses the textile sheet. However, it is still necessary to provide a gap between adjacent textile sheets to allow air flow to create a good aerobic environment. Preferably, the width of the gaps between the textile sheets 51 is 6.4mm or less, and most preferably about 3.2 mm. Reducing the width between adjacent textile sheets 51 provides a further advantage by allowing more filter media 5 to be installed in an aerobic filter 23 for a given aerobic filter 23 volume.

Among them, the thickness of the textile sheet 51 is preferably 3.81 mm.

In a possible implementation manner, the number of the distribution manifolds 4 is more than two, and the more than two distribution manifolds 4 are arranged at intervals and evenly in sequence along the width direction of the shell. In this way, the distribution manifold 4 can cover the upper side of the filter medium 5, and the spraying area of the sewage can be increased, so that the sewage can be more sprayed on the filter medium 5.

Further, in a possible implementation manner, the distribution manifold 4 is provided with a plurality of nozzles 6, and the nozzles 6 are uniformly arranged at intervals along the length direction of the distribution manifold 4. In addition, the nozzles 6 provided on the adjacent distribution manifolds 4 are arranged in a staggered manner so that the nozzles 6 can uniformly spray the contaminated water onto the filter media 5.

In a possible implementation, in the case of the prior art textile media, the effluent of the septic tank introduced into the aerobic filter 23 flows through the outside of the filter media 5 (hydraulic sheets) instead of being treated by the filter media 5, reducing the water holding capacity, so that the septic tank wastewater sprayed on the filter media 5 enters the filter media 5 and is treated, and the treatment effect is improved when the retention time of the wastewater is reduced. In addition, the high water holding capacity contributes to an anoxic condition that is not suitable for the aerobic environment required for secondary treatment.

Among them, the filter medium 5 is a textile sheet 51, which has a low water holding capacity by itself and contributes to improvement of aerobic environment.

In one possible implementation, the woven sheet 51 of filter media 5 employed in the embodiments of the present application, with a larger open area, allows for significantly higher loading rates, relative to conventional sand bodies of filter media 5, while still providing good handling properties. The larger open area also provides greater solids accumulation capacity and prevents face plugging.

In a possible implementation manner, the support rods 52 may be glass fiber rods, or may be provided with vertical support frames, which support the filter medium 5, and the functions are the same, which will not be described in detail herein.

In a possible realization, an air outlet 3 is opened in the side wall of the housing of the aerobic filter 23, and the air outlet 3 is in communication with the outside through a pipe. The vent 3 is provided such that the filter medium 5 within the aerobic filter 23 is maintained in an aerated state to support aerobic microorganisms which degrade or oxidize organic material present in the liquid, thereby reducing BOD (biochemical oxygen demand) and TSS (total suspended solids). At the same time, nitrifying bacteria convert ammonia nitrogen present in the liquid into nitrate nitrogen.

Referring to fig. 2, in one possible implementation, in the tank 11, the sewage is divided into three layers by the action of gravity. The solids are separated from the wastewater and distributed into a lower level sludge blanket and an upper level scum blanket with a relatively clear central horizontal liquid layer having an upper surface therebetween. Meanwhile, the anaerobic bacteria convert organic nitrogen in the wastewater into ammonia nitrogen. The liquid layer is continuously communicated between the septic tank and the recirculation tank through holes formed in the partition plate, or the partition plate may be removed, so that the entire tank 11 is a combination of the septic tank and the recirculation tank.

Further, with reference to fig. 2, in a possible implementation, a water inlet 7 is made in one side wall of the tank 11, communicating with the outside through a pipe, receiving raw sewage from a house or other place, untreated, with a significant concentration of waste solids.

Referring to fig. 7, further, in a possible implementation, the water pump 10 and the tubular filter 8 are arranged on the other side of the water tank 11. Wherein, the tubular filter 8, the water outlet pump 10 and the water inlet 1 arranged on the aerobic filter 23 are connected in sequence and communicated. The aerobic filter 23 is used for filtering solids in liquid entering the shell through holes, and the water outlet pump 10 is used for conveying sewage filtered by the tubular filter to the aerobic filter 23 to be sprayed on the filter medium 5 for advanced treatment. The tubular filter 8 and the water outlet pump 10 are all in the prior art, and will not be described in detail herein.

Wherein a control panel (not shown) controls the operation of the water pump 10 via electrical conduits connected to the junction box 22. The water pump 10 is intermittently activated in accordance with a conventional float switch assembly including a redundant on/off alarm float 90, a timer cover on/off float 91 and a timer cover on/alarm float 92. When activated, the effluent pump 10 pumps ammonia-containing wastewater through the inlet 1 of the tank 11 into the aerobic filter 23.

In another possible implementation, the water inlet 1 may be in communication with a tank 11 or chamber containing one or more intervening liquids.

The treatment process of sewage in this application embodiment: sewage enters the water tank 11 from the water inlet 7 to be precipitated, the liquid layer is further filtered through the tubular filter 8 arranged in the water tank 11, the tubular filter 8 is communicated with the water outlet pump 10, and the other end of the water outlet pump 10 is communicated with the water inlet 1 of the aerobic filter 23 and used for pumping the sewage into the aerobic filter 23. Top in the aerobic filter 23, from last to having set gradually distribution manifold 4 and filter media 5 down, be provided with nozzle 6 on the distribution manifold 4, and distribution manifold 4 and the water inlet 1 intercommunication on the aerobic filter 23, be used for even spraying of sewage on filter media 5, sewage flows out from last to down from the inside of filter media 5, the leakage fluid dram that has oxygen filter 23 bottom to offer flows in, the leakage fluid dram intercommunication is provided with filtrating shunt 2, filtrating shunt 2 intercommunication is including first communicating pipe and second communicating pipe, first communicating pipe communicates in water tank 11, the second communicating pipe communicates in the outside, be applicable to the intercommunication drainage field, the sewage in the inflow water tank 11, can carry out a lot of filtrations.

Having described embodiments of the present application, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims (9)

1. An aerobic filtration system using a woven filter media comprising:

an aerobic filter and a water tank;

the aerobic filter is arranged at the top of the water tank and is arranged up and down, and the aerobic filter is communicated with the water tank through a pipeline;

the aerobic filter comprises a housing, a distribution manifold, support rods and a filter medium;

a distribution manifold and a support rod are sequentially arranged in the shell from top to bottom, a water inlet is formed in the side wall of the shell, and the distribution manifold is communicated with the water inlet; the number of the supporting rods is multiple, and the supporting rods are sequentially arranged along the length direction of the shell;

the filter media are textile sheets and are erected on the supporting rods, and a preset distance is reserved between every two adjacent filter media; and is

The preset distance is within the range of 3.2 mm-6.4 mm.

2. The aerobic filtration system using textile filter media according to claim 1 wherein the number of distribution manifolds is two or more, and the two or more distribution manifolds are arranged in sequence, evenly and at intervals along the width direction of the housing.

3. The aerobic filtration system using textile filter media according to claim 2 wherein, the distribution manifold is provided with a plurality of nozzles in communication, and the nozzles are arranged in sequence along the distribution manifold; and is

The nozzles on adjacent distribution manifolds are offset.

4. An aerobic filtration system using a textile filter media according to claim 1 whereby the thickness of the filter media is in the interval 3.81 mm-4 mm.

5. The aerobic filter system using textile filter media according to claim 1, wherein the side wall of the housing is opened with an air outlet, and the air outlet is communicated with the outside through a pipeline.

6. The aerobic filtration system using textile filter media according to claim 1, wherein the bottom of the housing is provided with a liquid outlet, and the liquid outlet is communicated with a filtrate splitter; and is

The filtrate splitter is communicated with a first communicating pipe and a second communicating pipe, the first communicating pipe is communicated with the water tank, and the second communicating pipe is suitable for being communicated with a discharge field.

7. The aerobic filter system using textile filter media according to claim 1, wherein the water tank has a water inlet opened on one side wall, communicating with the outside through a pipe, adapted to receive sewage; and a water outlet pump and a tubular filter are arranged on the other side of the water tank, and the tubular filter, the water outlet pump and the water inlet are sequentially communicated.

8. The aerobic filtration system using textile filter media according to claim 7 wherein a switch assembly is connected to the effluent pump, said switch assembly comprising a redundant on/off alarm float, a timer cover on/off float and a timer cover on/off alarm float.

9. The aerobic filtration system using textile filter media according to claim 8, wherein the top of the water outlet pump is provided with a junction box, the junction box is suitable for connecting with a control panel for controlling the switch assembly to be intermittently started.

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