CN110156162A - The micro- light bed biochemical treatment apparatus of one kind and sewage water treatment method - Google Patents

Abstract

The invention discloses a micro-light bed biochemical treatment device and a sewage treatment method. The device mainly includes a shell (100), a sewage treatment area (200) is arranged in the lower part of the shell (100), and a mud discharge pipe (36) is connected to the upper part. ); the sewage treatment area (200) is provided with the first treatment unit (1) including the anoxic area (10) or further including the anaerobic area and the second treatment unit (20) including the aerobic area (20) from bottom to top 2), the first treatment unit (1) and the second treatment unit (2) of the sewage treatment area (200) are respectively provided with the first and second dispersed light fillers (16, 26) with the same or different densities, and the sewage treatment The top of the zone (200) is provided with a separation screen (211); the inner bottom of the first and second processing units (1, 2) is respectively provided with first and second aeration devices (12, 22). The device has the advantages of high sludge concentration, simple and compact structure, less land occupation, stable and reliable effluent quality, easy implementation and maintenance, and low energy consumption.

Description

A micro-light bed biochemical treatment device and sewage treatment method

technical field

The invention relates to the technical field of sewage treatment, more specifically, it relates to a micro-light bed biochemical treatment device and a sewage treatment method.

Background technique

With the rapid development of my country's economy and the continuous improvement of people's living standards, the amount of wastewater discharge is increasing day by day, and the damage to my country's ecological environment and water resources is also increasingly apparent. In order to further protect the ecological environment and water resources, my country's environmental protection regulations are becoming increasingly strict, and the control requirements for target pollutants such as COD, ammonia nitrogen, total nitrogen and total phosphorus in various large and small sewage treatment plants (stations) are also getting higher and higher. Biochemical method is the most commonly used and relatively economical main treatment method in various large and small sewage treatment plants (stations), mainly including traditional methods represented by AO, A2O process and its improved process, oxidation ditch, Cass process, SBR process, etc. Activated sludge method, and biofilm method represented by biological aerated filter (BAF for short), biological contact oxidation method and moving bed biofilm reactor (MBBR for short), and membrane bioreactor (MBR for short) as the representative Representative high concentration activated sludge method.

In order to improve the treatment efficiency and stability, the general idea is to increase the volume load of the biochemical tank, and the effective way to increase the volume load of the biochemical tank is usually to increase the sludge concentration or microbial biomass. For the existing above-mentioned methods, in the actual operation process, the higher sludge concentration will bring a great test to the normal operation of the subsequent sedimentation link or mud-water separation link. Generally, it is difficult to continue stable operation, which is not conducive to further improving the biochemical tank. The sludge concentration and microbial biomass, especially the sludge concentration and microbial biomass in the aerobic zone or aerobic period, are not conducive to further improving and mining the carbon removal and nitrification efficiency in the aerobic zone or aerobic period.

Contents of the invention

Integrating the advantages and disadvantages of existing biochemical process methods, the inventor has developed a kind of micro-light bed biochemical treatment device and sewage treatment method according to the production design experience of water treatment for many years, which can improve the sludge concentration and sewage treatment method of biochemical pool more effectively. The total amount of microorganisms, especially the sludge concentration and microbial biomass in the aerobic zone, can greatly reduce the volume and residence time of the biochemical reactor, effectively reduce energy consumption and improve stability, and save land occupation and investment.

Specifically, the present invention provides the following technical solutions: a micro-light bed biochemical treatment device, including a housing, the lower part of the housing is connected with a water inlet pipe, and the top is connected with a water outlet pipe; the inside of the housing is provided with a sewage treatment area , the upper part of the shell communicates with a sludge discharge pipe; the sewage treatment area is provided with a first treatment unit and a second treatment unit from bottom to top, and the first treatment unit includes at least one anoxic zone or includes at least one anoxic zone and at least one anaerobic zone, the second treatment unit includes at least one aerobic zone; the first treatment unit and the second treatment unit in the sewage treatment zone are respectively provided with the same or different first and second Dispersed micro-light fillers, the density of the first and second dispersed micro-light fillers is 0.65 to 1.00 times the density of sewage; the top of the sewage treatment area is provided with a separation screen for separating the fillers; the bottom of the first treatment unit is equipped with There is a first aeration device for flushing, and a second aeration device for aeration during sewage treatment is provided at the bottom of the second treatment unit.

Further, any cross-section of the housing is circular, or regular n-sided and n≥4, or rectangular.

Further, the first and second dispersed light fillers are regular-shaped entities, the largest linear dimension is not less than 5mm, for example, it can be 5-300mm; the specific surface area is not less than 300m ² /m ³ , for example, it can be 300-2000m ² /m ³ ; and when the sewage body flows through, the volume of the first dispersed microlight filler suspended in the first treatment unit is not less than 50% of the volume of the first treatment unit, and the first and second dispersed microlight fillers The filling volume is not higher than 90% of the total volume of the sewage treatment area.

Further, the housing is provided with a trumpet-shaped isolation cylinder that separates the interior of the housing to form the sewage treatment area and the sedimentation tank located on the upper periphery of the sewage treatment area. The outer edge of the bottom of the horn-shaped isolation cylinder is connected with the inner wall of the housing. The bell mouth of the horn-shaped isolation cylinder faces the bottom of the housing; the separation screen is arranged in the horn-shaped isolation cylinder and its edge is connected with the inner wall of the horn-shaped isolation cylinder.

Furthermore, a diversion device is provided in the casing on the periphery of the horn-shaped isolation cylinder for guiding the treated sewage flowing out from the top of the horn-shaped isolation cylinder to the bottom of the sedimentation tank.

Still further, the upper coaxial sleeve of the horn-shaped isolation cylinder is provided with a horn-shaped guide tube, the horn mouth of the horn-shaped guide tube faces the bottom of the housing, and the top of the horn-shaped guide tube is higher than the horn-shaped isolation tube. The top of the tube, the bottom of the horn-shaped draft tube is higher than the bottom of the sedimentation tank; the inner wall of the horn-shaped draft tube and the outer wall of the horn-shaped isolation tube form an annular flow channel; the horn-shaped isolation tube and Any cross-section of the trumpet-shaped guide tube is circular, or regular n-sided with n≥4, or rectangular.

Further, the upper part of the sedimentation tank is provided with an outlet water collection tank, and the outlet water collection tank is connected to the outlet pipe; the mud discharge pipe is connected to the bottom of the sedimentation tank; the bottom of the sedimentation tank is also connected to a return pipe connected to the water inlet pipe.

Further, the geometric dimension of the cross section of the housing corresponding to the part above the bottom of the sedimentation tank is larger than the geometric dimension of the cross section corresponding to the bottom of the sedimentation tank.

The sewage treatment method provided by the invention comprises the following steps:

Let the sewage enter the sewage treatment area from the bottom of the first treatment unit through the water inlet pipe, and flow upwards successively through the bed formed by part of the first dispersed light filler suspended in the first treatment unit and the second dispersed light filler and the remaining The first dispersed light filler is suspended in the bed formed by the second treatment unit, during which, the second aeration device is opened and the first aeration device is closed;

Make the sewage after the biochemical and filtration treatment of the bed in the aerobic zone flow out from the top of the second treatment unit, the sewage of equal water inflow is discharged from the outlet pipe on the top of the shell, and the other part of sewage passes through the return pipe Mix with the sewage in the water inlet pipe and return to the sewage treatment area;

When it is necessary to discharge mud, close the second aeration device, open the first aeration device, flush the first and second dispersed light fillers dispersed in the first treatment unit and the second treatment unit, and make the sewage treatment area fluidized State, make the biofilm of the first and second dispersed light fillers partly fall off through friction, and at the same time make the floc activated sludge in the gap between the first and second dispersed light fillers flow through the sewage treatment area with the sewage and be discharged by the described mud pipe discharge;

After the mud discharge is completed, the first aeration device is closed to continue to process the sewage.

Further, the aeration intensity of the first aeration device is not lower than 3m ³ /(m ² ·h), such as 3-10m ³ /(m ² ·h), and makes the first processing unit and the The first and second dispersed light fillers in the second processing unit reach a fluidized state.

In summary, the present invention has the following beneficial effects:

1. This scheme uses the first and second dispersed microlight fillers whose density is 0.65~1.00 times of the sewage density. Compared with the traditional method, the filling amount of the filler is increased, thus providing a larger contact area; secondly, in actual operation Among them, the filler filling rate in the aerobic zone is close to 100%, which greatly strengthens the carbon removal and nitrification functions in the aerobic zone;

2. The sewage treatment method using this scheme has the advantages of both activated sludge and biofilm, and has high sludge concentration, large microbial biomass, and rich biological phases, and can ensure the activity of microorganisms, and has the ability to remove waste water in the same pool. High-quality environment for carbon, denitrification, and phosphorus removal, and the effluent is more high-quality, stable, and reliable.

3. Due to the large sludge concentration and microbial biomass, the volume load of the biochemical reactor can be greatly increased, and the volume of the device can be reduced, so the infrastructure cost can be greatly reduced.

4. In terms of structural layout, since the anaerobic, anoxic, aerobic and sedimentation areas are vertically arranged in the same shell, it can greatly save the occupied area and improve the land utilization rate.

5. The formed suspended bed can greatly prolong the residence time of the air bubbles in the water, thereby improving the utilization rate of oxygen in the aeration air volume, so it can effectively reduce the aeration air volume and reduce the operating cost.

6. Due to the high porosity of the bed, the resistance loss of the bed is small and it is not easy to be blocked.

7. Since the first and second treatment units in the sewage treatment area respectively adopt the first and second dispersed micro-light fillers, the required energy consumption is low during backwashing, and backwashing can fluidize the entire bed, backwashing The effect is thorough.

8. Due to the existence of the suspended bed, the water flow constantly changes direction in the bed gap, inertially collides with activated sludge and biofilm, and such hydraulic conditions are more conducive to the mass transfer of pollutants.

9. Due to the three-dimensional support effect of the bed in the first and second treatment units, the activated sludge flocs settle on it, instead of being deposited on the bottom of the tank and lose their activity due to compaction and dehydration, so even if the sludge concentration is high , can still maintain sludge activity.

10. Due to the high sludge concentration and large microbial biomass in the bed layer, the organic load of the sludge can be effectively reduced, making the impact resistance of the entire reactor much stronger than the traditional process.

11. Due to the high concentration of sludge in the bed layer and the large amount of microorganisms, the reduction of sludge load can greatly reduce the sludge output of the reactor and save the cost of subsequent sludge treatment and disposal.

Description of drawings

Fig. 1 is the structural representation of the embodiment 1 of a kind of micro light bed biochemical treatment device provided by the present invention;

Fig. 2 is the structural representation of the embodiment 2 of a kind of micro light bed biochemical treatment device provided by the present invention;

Fig. 3 is a schematic structural view of Embodiment 3 of a micro-slight bed biochemical treatment device provided by the present invention.

Reference signs:

1. The first processing unit; 2. The second processing unit; 3. Sedimentation tank; 10. Anoxic zone; 11. Water distribution device; 12. First aeration device; 13. Water inlet pipe; 14. First air intake pipe ; 15, emptying pipe; 16, the first dispersed slightly light filler; 20, aerobic zone; 21, trumpet-shaped isolation cylinder; 211, separation screen; 22, the second inflation device; 23, the second air intake pipe; 26. The second dispersed light filler; 31. Trumpet-shaped guide tube; 311. Cylinder part; 312. Flared part; 32. Annular flow channel; 33. Water outlet collection device; 34. Outlet pipe; 35. Return pipe 36, mud discharge pipe; 361, mud discharge collection device; 310, return pump; 100, shell; 200, sewage treatment area.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings.

Example 1

As shown in FIG. 1 , a micro-slight bed biochemical treatment device provided in Embodiment 1 of the present invention includes a housing 100 , and a sewage treatment area 200 is arranged inside the housing 100 .

The lower part of the housing 100 is connected with a water inlet pipe 13, and the lower part of the sewage treatment area 200 is provided with a water distribution device 11 connected with the water inlet pipe 13, such as a commonly used water distributor. A water outlet collecting device 33 is provided on the top of the casing 100 , and the outlet water collecting device 33 is connected to a water outlet pipe 34 . In the present invention, the cross section of the housing 100 may be circular, or regular n-sided with n≧4, or rectangular. In the embodiments, the present invention is described by taking the cross-section of the housing 100 as a circle, but this does not constitute a limitation to the present invention.

In order to achieve different treatment effects, different sewage treatment units can be set in the sewage treatment area 200 . In this embodiment, a first treatment unit 1 and a second treatment unit 2 are arranged in the sewage treatment area 200 from bottom to top. The first treatment unit 1 may include at least one anoxic zone 10 , or at least one anoxic zone 10 and at least one anaerobic zone (not shown), and the second treatment unit 2 includes at least one aerobic zone 20 . Correspondingly, the bottom of the second treatment unit 2 is provided with a second aeration device 22 for aeration during sewage treatment, and the bottom of the first treatment unit 1 is provided with a first aeration device 12 for flushing, It is closed during sewage treatment.

The first inflator 12 includes a first air intake duct 14 communicating with the bottom of the housing 100, and the second inflator 22 includes a second air intake duct 23 communicating with the side of the middle of the housing 100. At the same time, the bottom of the housing 100 communicates with a discharge Empty Tube 15.

In this embodiment, in order to increase the sludge concentration and microbial biomass in the device, the first treatment unit 1 and the second treatment unit 2 of the sewage treatment area 200 are respectively filled with the first treatment unit that can fluidize and disperse when the sewage flows through. Dispersed slightly light filler 16 and the second dispersed slightly light filler 26, the density of the first and second dispersed slightly light filler 16,26 is 0.65～1.00 times of sewage density, the density of the first and second dispersed slightly light filler 16,26 can be The same or different, the upper part of the sewage treatment area 200 is provided with a separation screen 211 for preventing filler loss. In the actual operation process, due to the problem of relative density, the first and second dispersed slightly light fillers 16, 26 are preferentially suspended and filled with the second treatment unit 2 to form an aerobic zone bed, and the remaining first Dispersed light filler 16 is suspended in the upper part of the first treatment unit 1 to form an anoxic zone bed.

In a preferred embodiment, the first and second dispersed slightly light fillers 16, 26 can be uniform, regular-shaped entities, such as the shape of K-type fillers in existing MBBR fillers or similar products, and the largest linear dimension is not less than 5mm. For example, it can be 5-300mm; the specific surface area is not less than 300m ² /m ³ , for example, it can be 300-2000m ² /m ³ .

In a preferred embodiment, when the fluid flows through, the volume of the dispersed slightly light filler 16 dispersed to the first treatment unit 1 is not less than 50% of the volume of the first treatment unit 1, and the second dispersed slightly light filler The sum of the filling volumes of 16 and the second dispersed filler 26 is not higher than 90% of the total volume of the sewage treatment area 200 .

In this embodiment, no settling tank is provided, which is suitable for working conditions where the concentration of various pollutants in the influent sewage is low and the concentration of suspended solids in the effluent is not high. In the structure of Embodiment 1, the sewage after being biochemically and filtered in the bed in the aerobic zone flows through the separation screen 211 and then directly enters the effluent collecting device 33 .

In this embodiment, a mud discharge collection device 361 is arranged on the top of the separation screen 211, and the mud discharge collection device 361 is connected with a mud discharge pipe 36, and the mud discharge end of the mud discharge pipe 36 can pass through the second processing unit 2 downwards and extend to outside the housing 100. During flushing, the sludge in the sewage treatment area 200 flows upwards and enters from the top of the sludge collection device 361 , and then is discharged out of the casing 100 through the sludge discharge pipe 36 .

In this embodiment, an applicable reflux process can be adopted, such as internal reflux or external reflux, so that the mixed liquid treated in the aerobic zone 20 can be refluxed into the anoxic zone 10 of the first processing unit 1 at the bottom of the shell 100, and utilized The carbon source cycle in the influent is fully denitrified and the total nitrogen is effectively removed. For example, a return pipe 35 communicating with the water inlet pipe 13 may be provided on the housing 100 above the sewage treatment area 200 , and a return pump 310 and a regulating valve may be provided on the return pipe 35 .

The working process of using this device for sewage treatment is: the mixed liquid in the sewage and return pipe 35 enters the water distribution device 11 from the water inlet pipe 13 at the bottom of the housing 100, and is evenly distributed in the first water distribution device 11 through the water distribution device 11. On the cross-section of a treatment unit 1, it flows upwards successively through the bed formed by part of the first dispersed type slightly light filler 16 suspended in the first treatment unit 1 and is composed of the second dispersed type slightly light filler 26 and the remaining first dispersed type slightly light filler 16 is suspended in the bed formed by the second treatment unit 2, during which, the second aeration device 22 is opened and the first aeration device 12 is closed; then the aerobic treated sewage passes through the mesh of the separation screen 211 and is discharged from the The top of the aerobic zone 20 flows out, and the sewage of the influent is collected by the effluent collection device 33 and discharged through the outlet pipe 34, and the other part of the sewage is finally returned to the bottom of the first treatment unit 1 through the return pipe 35, and the carbon in the influent is used The source circulates in the first treatment unit 1 for sufficient denitrification to remove total nitrogen.

When it is necessary to discharge mud, close the second aeration device 22, open the first aeration device 12, and make the air flow flush the first and second dispersed light fillers 16, 26 suspended in the first treatment unit 1 and the second treatment unit 2, Make the sewage treatment area 200 in a fluidized state, make the biofilm on the first and second dispersed light fillers 16 and 26 fall off through friction, and at the same time make the first and second dispersed light fillers 16 and 26 gaps The floc activated sludge enters the bottom of the sedimentation tank 3 along with the sewage and is discharged by the sludge discharge pipe 36; after the sludge discharge is completed, the first aeration device 12 is closed to continue to process the sewage.

In the sewage treatment process, various pollutants in the sewage are fully mixed with the reflux liquid and microorganisms in the first treatment unit 1, and the denitrification bacteria use the carbon source in the sewage to perform denitrification to remove nitrate nitrogen, and remove Some carbon pollutants. Under the premise of setting an anaerobic area in the sewage treatment area 200, in cooperation with the anaerobic environment in the biofilm, the phosphorus accumulating bacteria complete the phosphorus release, and the denitrifying bacteria continue to use the carbon source in the sewage to denitrify to remove nitrate. During this process, the Kjeldahl nitrogen in the sewage completes the ammonification to form ammonia nitrogen, and enters the aerobic zone 20 with the remaining carbon-containing pollutants, where aerobic treatment is carried out in the aerobic zone 20 and transformed by aerobic bacteria into nitrified nitrogen, carbon dioxide and water, and the nitrate nitrogen is returned to the first treatment unit 1 with the reflux liquid to complete denitrification, so that the total nitrogen is continuously removed by circulation; the phosphorus accumulating bacteria that have released phosphorus will denitrify in an aerobic environment Excessive adsorption of phosphorus in the aerobic zone 20 can complete the removal of total phosphorus in sewage by discharging excess phosphorus-rich sludge.

Compared with various traditional activated sludge methods, first of all, this scheme is filled with the first and second dispersed microlight fillers 16 and 26 with high volume ratios, which have a larger specific surface and higher void ratio, and are not only easy to form Rich biofilm, and can intercept, precipitate and filter a large amount of activated sludge flocs in the three-dimensional void with a porosity of more than 75%, so that the sludge concentration in the anoxic zone can reach 2 times that of the traditional activated sludge method The sludge concentration in the aerobic zone is more than three times that of the traditional activated sludge process. Even so, due to the support of the filler, it will not be deposited and compacted on the bottom of the tank due to low aeration intensity or stirring intensity. After losing the activity, it can still maintain a high sludge activity, which greatly increases the volume load, and the tank capacity can be designed to be smaller and occupy a smaller area, thereby saving construction investment times; secondly, due to the interception, sedimentation and filtration of the bed , so that the concentration of the mud-water mixture entering the sedimentation area is not high, even lower than that of the traditional activated sludge method, which greatly reduces the solid load in the subsequent sedimentation area and ensures the effect of mud-water separation; finally, due to the interception effect of the bed , will greatly prolong the residence time of the aeration bubbles in the water and increase the air-water contact time, so the utilization rate of oxygen in the aeration process can be greatly improved, thereby greatly reducing the aeration volume and saving energy consumption.

Compared with the traditional biological aerated filter technology, firstly, the specific surface area of the first and second dispersed light fillers 16 and 26 filled in this scheme is large, as high as 300m ² /m ³ or more, and the void ratio is high, as high as 75%. Therefore, it is not easy to clog, and the biofilm is more abundant; secondly, the density of the first and second dispersed light fillers 16 and 26 filled in this scheme is small, and the flushing is easier to reach a fluidized state. On the one hand, it can reduce the energy consumption of flushing, and on the other hand, the The state strengthens the flushing effect, it is easier to discharge the aging biofilm, and the flushing is thorough; again, in terms of structure and performance, this device is simpler than the traditional biological aerated filter structure, and can arrange anaerobic zone, anoxic zone and The aerobic zone can realize functions such as carbon removal, nitrogen removal, and phosphorus removal in the pond; finally, because the density of the first and second dispersed light fillers 16 and 26 is much smaller than that of the biological aerated filter filler, and the filler layer is In the suspended state, there is no pressure on the bottom of the pool, so it can reduce the bearing capacity requirements of the civil structure and further reduce the construction cost.

Compared with the biological contact oxidation technology, firstly, the specific surface area of the filler in this scheme is larger, so the amount of biofilm is larger; secondly, there is no need to design filler fixing brackets in structure, and the structure is simple, which reduces the manufacturing cost of the reactor; finally, this scheme The packing of the scheme is a dispersed structure, and it is easy to realize friction cleaning in a fluidized state, and it is easier to realize the alternate operation of newborn, mature and aging biofilms, with higher stability and better effect.

Compared with MBBR technology, first of all, the filler filling rate of this scheme is more than twice that of the existing MBBR technology. Under the condition of achieving the same amount of biofilm, the tank volume can also be reduced to less than 1/2, thereby reducing the occupied area and investment; secondly, during operation, there is no need to worry about the accumulation of filler in the dead zone, and there is no need to ensure sufficient aeration intensity to make the filler reach a fluidized state, thereby saving aeration air volume and reducing operating costs; finally, there are still There are a large number of activated sludge flocs, so the effluent is more high-quality, stable and reliable.

Compared with MBR technology, firstly, the sludge concentration and microbial biomass of this scheme can reach or even exceed the concentration of 10g/L in the MBR process, which shows that the efficiency is higher; secondly, in operation, there is no need for membrane scrubbing fans, no need for Pumps, so in terms of energy consumption, MBR cannot compare with it; finally, there is no trouble of membrane fouling, chemical cleaning and replacement of new membranes.

Example 2

As shown in Figure 2, the difference between the device provided by Embodiment 2 and Embodiment 1 is that a horn-shaped isolation cylinder 21 whose bottom outer edge is connected to the inner wall of the housing 100 is provided in the housing 100, and the horn-shaped isolation cylinder 21 The bell mouth of the horn is towards the bottom of the housing 100, and the horn-shaped isolation cylinder 21 separates the inner space of the housing 100 into a sedimentation tank 3 located at the periphery of the horn-shaped isolation cylinder 21 and a sedimentation tank 3 located at the inside of the horn-shaped isolation cylinder 21 and extending to the bottom of the housing 100 The sewage treatment area 200. In this structure, the effluent collection tank 33 can be arranged inside or outside the sedimentation tank 3 , the sludge discharge pipe 36 is connected to the bottom of the sedimentation tank 3 , and the separation screen 211 can be arranged on the top of the trumpet-shaped isolation cylinder 21 . In this scheme, an independent sedimentation tank 3 is set up, so the effluent is more reliable and stable.

In this embodiment, a diversion device for guiding the treated sewage flowing out from the top of the horn-shaped isolation cylinder 21 to the bottom of the sedimentation tank 3 is provided on the periphery of the horn-shaped isolation cylinder 21 in the housing 100 .

The deflector can include a horn-shaped deflector 31 coaxially sleeved on the upper part of the horn-shaped isolation cylinder 21, and the bell mouth of the horn-shaped deflector 31 is also toward the bottom of the housing 100, so that the horn-shaped deflector 31 An annular channel 32 is formed between the inner wall and the outer wall of the trumpet-shaped isolation cylinder 21 .

In the present invention, the specific structures of the horn-shaped isolation cylinder 21 and the horn-shaped guide cylinder 31 are not particularly limited, and their structures can be set according to actual needs. Any cross-section of the horn-shaped isolation cylinder 21 and the horn-shaped guide cylinder 31 may be circular, regular n-gon and n≧4, or rectangular. In the embodiments, the cross sections of the horn-shaped isolation tube 21 and the horn-shaped guide tube 31 are circular for illustration, but this does not constitute a limitation to the present invention.

In addition, in the present invention, it is necessary to ensure that the top of the horn-shaped guide tube 31 is higher than the top of the horn-shaped isolation tube 21, which can be flush with the top of the housing 100, so as to prevent sewage from directly entering the sedimentation tank 3 from the upper part of the sedimentation tank 3; Moreover, it is necessary to ensure that the bottom end of the horn-shaped draft tube 31 is higher than the bottom of the sedimentation tank 3. Preferably, the horn-shaped draft tube 31 includes a cylindrical portion 311 and a flared portion 312 connected thereto. The cylindrical portion The junction of 311 and flared portion 312 approximately corresponds to the position of the suspended sludge layer in the sedimentation tank 3, so as to reserve a stable sludge storage area at the bottom of the sedimentation tank 3.

The working process of using this device for sewage treatment is: the mixed liquid in the sewage and return pipe 35 enters the water distribution device 11 from the water inlet pipe 13 at the bottom of the housing 100, and is evenly distributed in the first water distribution device 11 through the water distribution device 11. On the cross-section of a treatment unit 1, it flows upward successively through the bed formed by the first dispersed slightly light filler 16 suspended in part of the first treatment unit 1 and is composed of the second dispersed slightly light filler 26 and part of the first dispersed slightly light filler. 16 is suspended in the bed layer formed by the second treatment unit 2, then flows out from the top of the aerobic zone 20 and passes through the mesh of the separation screen 211 at the top of the trumpet-shaped isolation cylinder 21, and enters the place through the annular flow channel 32. At the bottom of the settling tank 3, after settling, the clear water is collected by the outlet water collecting device 33 at the top of the settling tank 3, and then discharged from the outlet pipe 34, and most of the settled sludge passes through the return pipe 35 and the water inlet pipe 13. After the sewage is mixed, it returns to the bottom of the first treatment unit 1 to participate in the biochemical reaction, and only a small amount of residual sludge is discharged from the device through the sludge discharge pipe 36 during the sludge discharge and backwashing stage. When needing mud discharge, carry out with reference to the mode of embodiment 1.

Example 3

As shown in FIG. 3 , the difference between Embodiment 3 and Embodiment 2 is that the geometric dimension of the section of the housing 100 corresponding to the upward part of the bottom of the sedimentation tank 3 is larger than the geometric dimension of the section corresponding to the bottom of the sedimentation tank 3 . Since the cross-section of the housing 100 in this embodiment is circular, the geometric dimension of the cross-section is the inner diameter of the housing 100 . (As shown in Figure 3).

In fact, those skilled in the art can make various modifications according to the idea of this embodiment, so that the inner diameter of the housing 100 starts from the connection between the trumpet-shaped isolation cylinder 21 and the housing 100 or the upper and lower positions close to the connection. increase upwards.

By adopting the above-mentioned structure, by increasing the sedimentation area of the sedimentation tank 3, the surface load of the sedimentation tank 3 can be reduced, thereby increasing the sludge settling time and improving the mud-water separation effect.

In the embodiment of the present invention, in the zone of muddy water precipitation, as the zone of separating screen 211 tops in embodiment 1, or in the settling tank 3 of embodiment 2,3, also can adopt other devices that can promote muddy water separation, such as Inclined plate or inclined tube settling device, all of these are within the protection scope of the claims of the present invention.

The above specific embodiment is only an explanation of the present invention, and it is not a limitation of the present invention. Those skilled in the art can make modifications to this embodiment without creative contribution according to needs after reading this specification, but as long as they are within the rights of the present invention All claims are protected by patent law.

Claims (10)

1. a kind of micro- light bed biochemical treatment apparatus, including shell (100), shell (100) lower part are communicated with water inlet pipe (13), Top is communicated with outlet pipe (34)；It is characterized in that,

Sewage diposal area (200) are equipped with inside the shell (100), the top of shell (100) is communicated with sludge pipe (36)；

First processing units (1) and the second processing unit (2) are equipped in the sewage diposal area (200) from bottom to top, at first Reason unit (1) includes at least one anoxic zone (10) or including at least one anoxic zone (10) and at least one anaerobic zone, institute Stating the second processing unit (2) includes at least one aerobic zone (20)；

It is identical that density is respectively arranged in the first processing units (1) of the sewage diposal area (200), the second processing unit (2) Or different first dispersions decline lightweight filler (16) and the second dispersion declines lightweight filler (26), first and second dispersion declines gently The density of filler (16,26) is 0.65 ~ 1.00 times of sewage density；It is provided with and is used at the top of the sewage diposal area (200) Separate the separating screen (211) of filler；

The interior bottom of the first processing units (1) is equipped with the first air charging system (12) for flushing, described the second processing unit (2) bottom is equipped in sewage treatment for the second air charging system (22) of aeration.

2. the micro- light bed biochemical treatment apparatus of one kind according to claim 1, which is characterized in that the shell (100) is appointed Meaning cross section is circle, perhaps the positive side n shape and n >=4 or rectangle.

3. the micro- light bed biochemical treatment apparatus of one kind according to claim 1, which is characterized in that first and second distributing Respectively uniform, regular shape the entity of micro- lightweight filler (16,26), maximum straight-line dimension are not less than 5mm, and specific surface area is not less than 300m²/m³；And when sewage flows through, be distributed to first processing units (1) first and second disperses lightweight filler (the 16,26) institute that declines The volume is not less than the first processing units (1) volume 50%, and first and second dispersion is accounted for decline the fillings of lightweight filler (16,26) Volume is not higher than the 90% of the sewage diposal area (200) volume.

4. the micro- light bed biochemical treatment apparatus of one kind according to claim 1, which is characterized in that set in the shell (100) Have and shell (100) inside is separated to form the sewage diposal area (200) and is located at sewage diposal area (200) top peripheral The tubaeform isolating cylinder (21) of sedimentation basin (3), tubaeform isolating cylinder (21) bottom end outer rim are connected with shell (100) inner wall, loudspeaker The horn mouth of shape isolating cylinder (21) is towards shell (100) bottom；Separating screen (211) be located at the top of tubaeform isolating cylinder (21) and Its edge is connected with tubaeform isolating cylinder (21) inner wall.

5. a kind of mixed bed biochemical treatment apparatus according to claim 4, which is characterized in that the interior position of the shell (100) It is equipped in the periphery of tubaeform isolating cylinder (21) for guiding from sewage stream after the processing that tubaeform isolating cylinder (21) top is flowed out To the guiding device of sedimentation basin (3) bottom.

6. the micro- light bed biochemical treatment apparatus of one kind according to claim 5, which is characterized in that guiding device includes coaxial line It is set in the tubaeform guide shell (31) on tubaeform isolating cylinder (21) top；The horn mouth direction of the tubaeform guide shell (31) Shell (100) bottom, tubaeform guide shell (31) top are higher than the top of the tubaeform isolating cylinder (21), the loudspeaker Shape guide shell (31) bottom end is higher than the bottom of sedimentation basin (3)；Tubaeform guide shell (31) inner wall tubaeform is isolated with described Annular channel (32) are formed between cylinder (21) outer wall；Times of the tubaeform isolating cylinder (21) and the tubaeform guide shell (31) Meaning cross section is respectively circle, perhaps the positive side n shape and n >=4 or rectangle.

7. the micro- light bed biochemical treatment apparatus of one kind according to claim 5, which is characterized in that sedimentation basin (3) top Equipped with effluent collection slot (33), the effluent collection slot (33) is connected to outlet pipe (34)；Sludge pipe (36) is connected to sedimentation basin (3) bottom；The bottom of sedimentation basin (3) is also communicated with the return pipe (35) being connected to water inlet pipe (13).

8. the micro- light bed biochemical treatment apparatus of one kind according to claim 4, which is characterized in that the shell (100) is corresponding It is greater than its section for corresponding to the sedimentation basin (3) bottom in the cross section geometry of the sedimentation basin (3) bottom above section Geometric dimension.

9. using the sewage water treatment method of any micro- light bed biochemical treatment apparatus of one kind of claim 1-8, including it is following Step:

Sewage is set to enter sewage diposal area (200) from the first processing units (1) bottom by water inlet pipe (13), upwards successively It flows through and is scattered in first processing units (1) by the dispersion of part first lightweight filler (16) that declines and is formed by bed and by second Dispersion declines lightweight filler (26) and residue first disperses to decline, and lightweight filler (16) is scattered in the second processing unit (2) and is formed by bed During which layer is opened the second air charging system (22), close the first air charging system (12)；

It flows out sewage biochemical by aerobic zone bed, after filtration treatment from the top of described the second processing unit (2), waits water inlet The sewage of amount is discharged by outlet pipe (34) described at the top of shell (100), and another part sewage passes through return pipe (35) and water inlet pipe (13) sewage diposal area (200) are returned after the sewage mixing in；

It when needing spoil disposal, closes the second air charging system (22), opens the first air charging system (12), flushing is suspended in the first processing The first and second dispersion in unit (1) and the second processing unit (2) declines lightweight filler (16,26), makes the sewage diposal area It (200) is in fluidized state, the biomembrane for making first and second dispersion decline on lightweight filler (16,26) is through the partial exfoliation that rubs, together When so that the first and second dispersion is declined in lightweight filler (16,26) gap wadding body activated sludge flow through sewage diposal area (200) with sewage And it is discharged by the sludge pipe (36)；

After spoil disposal, closes the first air charging system (12), continue with sewage.

10. sewage water treatment method according to claim 9, which is characterized in that the aeration of first air charging system (11) Intensity is not less than 3m³/ (m²H), and make in the first processing units (1) and described the second processing unit (2) first, The two dispersion lightweight fillers (16,26) that decline reach fluidized state.