CN212476285U - Sewage treatment system - Google Patents
Sewage treatment system Download PDFInfo
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- CN212476285U CN212476285U CN202021090133.XU CN202021090133U CN212476285U CN 212476285 U CN212476285 U CN 212476285U CN 202021090133 U CN202021090133 U CN 202021090133U CN 212476285 U CN212476285 U CN 212476285U
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Abstract
The application provides a sewage treatment system, relates to sewage treatment technical field. The first treatment device of the sewage treatment system is filled with first biological membrane filler, and the filling rate of the first biological membrane filler reaches more than 50%. Because the packing rate of first biomembrane filler is higher, consequently can form the filter bed, can adsorb and filter the suspended solid in the sewage, be favorable to follow-up deep purification to sewage. The first biomembrane filler of high filling rate can reduce the mobility in the first processing apparatus for the oxygen deficiency state appears in the part in the first processing apparatus, is favorable to realizing the denitrification, reduces the nitrogen content in the sewage. The sludge at the bottom of the first treatment device generates internal carbon source release for the denitrification process, so that external carbon sources are saved. The sewage treatment system can play a better removing effect on suspended solids in sewage, has a better denitrification effect, saves occupied space and is applicable to underground sewage treatment plants.
Description
Technical Field
The application relates to the technical field of sewage treatment, in particular to a sewage treatment system.
Background
With the continuous expansion of urban scale and the increase of population, water environment pollution becomes a key pollution problem which needs to be solved urgently. For sewage with a low carbon-nitrogen ratio (C/N), the traditional sewage treatment process has poor denitrification effect under the condition of no external carbon source, and if a carbon source is added, the cost is high. If the amount of Suspended Solids (SS) in the inlet water of the sewage treatment plant is high or the outlet water of the common treatment process has high suspended solids, the difficulty of subsequent advanced treatment is increased. The existing sewage treatment system and device have poor treatment effect on suspended solids in sewage.
SUMMERY OF THE UTILITY MODEL
The purpose of this application is including providing a sewage treatment system, and it can play better effect of removing to the suspended solid in the sewage to have better denitrogenation effect concurrently.
The embodiment of the application can be realized as follows:
the embodiment of the application provides a sewage treatment system, including first processing apparatus, first processing apparatus has the cavity that holds sewage, and first processing apparatus is provided with water inlet and delivery port, has first biomembrane filler in first processing apparatus's the cavity, and the filling rate of first biomembrane filler is more than 50%, so that first biomembrane filler is in be in the restricted state of motion in the first processing apparatus.
In an alternative embodiment, the first treatment device is provided with a sludge discharge port on a side wall near the bottom thereof, and the water outlet is opened on a side wall near the top end thereof. In other alternative embodiments, the sludge discharge mode of the first treatment device can be back flushing or the like.
In an alternative embodiment, the first biofilm filler comprises at least one of high density polyethylene, polystyrene.
In an alternative embodiment, the first biofilm filler has a packing fraction of 60% to 75%.
In an alternative embodiment, the first biofilm filler has a specific gravity of 0.8 to 1.2.
In an alternative embodiment, the first biofilm carrier has a specific surface area of 200m or more2/m3The porosity is 50% -90%.
In an alternative embodiment, the wastewater treatment system further comprises a second treatment device having a chamber for containing wastewater, the second treatment device being located upstream of and in communication with the first treatment device, the second treatment device being provided with a water inlet, the chamber of the first treatment device being separated from the chamber of the second treatment device by a filter assembly, the chamber of the first treatment device having a second biofilm carrier therein.
In an alternative embodiment, the second biofilm filler has a packing fraction of 10% to 50%.
In an alternative embodiment, an aeration device is provided within the second treatment device.
In an alternative embodiment, the filter assembly comprises a metal screen or perforated plate, wherein the mesh size of the metal screen and the perforated plate have a perforation size smaller than the first and second biofilm packings, optionally having a porosity of between 40% and 55%.
The beneficial effects of the embodiment of the application include:
the sewage treatment system of the embodiment of the application comprises a first treatment device, wherein a first biological membrane filler is filled in the first treatment device, and the filling rate of the first biological membrane filler reaches more than 50%. In the sewage treatment process:
(1) the first biological membrane filler is used for adsorbing and decomposing organic matters in the sewage through microorganisms on the surface, and a filter bed can be formed due to the fact that the filling rate of the first biological membrane filler is high, and a large amount of suspended solids in the sewage can be adsorbed and filtered. Reduce a large amount of suspended solids (reduce SS) in the sewage, and is favorable for subsequent deep purification of the sewage.
(2) The first biomembrane filler of high filling rate can reduce the mobility in the first processing apparatus for the oxygen deficiency state appears in the part in the first processing apparatus, makes first biomembrane filler can realize the denitrification denitrogenation, reduces the nitrogen content in the sewage.
(3) The sludge at the bottom of the first treatment device generates internal carbon source release for the denitrification process, so that the sludge yield is reduced, the carbon source added from the outside for denitrification is reduced, and the cost is reduced.
(4) The system has the advantages of saving occupied land and the like, and is suitable for areas with limited land resources, such as underground sewage plant construction.
Therefore, the sewage treatment system can achieve a good effect of removing suspended solids in sewage and has a good denitrification effect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 is a schematic view of a wastewater treatment system according to an embodiment of the present application.
Icon: 010-sewage treatment systems; 100-a first processing device; 110-a water outlet; 120-a first biofilm filler; 130-a sludge discharge port; 140-a filter assembly; 200-a second processing device; 210-a water inlet; 220-second biofilm filler; 230-aeration device.
Detailed Description
With the continuous expansion of urban scale and the increase of population, water environment pollution becomes a key pollution problem which needs to be solved urgently. The energy consumption of some sewage treatment plants is high, so that the sewage treatment cost is increased, and the current energy crisis is aggravated; secondly, due to the characteristic of insufficient carbon source in the municipal sewage, if the external carbon source is not added, the high-efficiency and stable denitrification effect is difficult to obtain, and the addition of the carbon source causes higher cost.
Researchers have observed many times that there is a loss of total nitrogen in aeration systems in some wastewater treatment processes. That is, the Nitrification and Denitrification reactions occur simultaneously under the aerobic condition, and this phenomenon is called Simultaneous Nitrification and Denitrification (SND). The mechanism of the phenomenon of synchronous nitrification and denitrification can be explained from the three aspects of macroscopic environment, microscopic environment and microbiology. The macroscopic environment theory is that the dissolved oxygen distribution of the reactor is uneven, and because of uneven oxygenation and uneven mixing, an aerobic zone and an anoxic zone with different areas are formed, which respectively provide suitable environments for nitrobacteria and denitrifying bacteria. The theory of microenvironment holds that: in the flocs or the biological membrane of the activated sludge, as the sludge has a certain thickness, when dissolved oxygen is transmitted from the surface of the flocs to the inside of the flocs, a dissolved oxygen concentration difference is formed, namely the dissolved oxygen concentration on the outer surface of the microbial flocs or the biological membrane is high, aerobic nitrifying bacteria are dominant, and the nitrification reaction is mainly carried out; inside the flocs or the biological membrane, because oxygen transfer is blocked and external oxygen is greatly consumed, an anoxic zone is generated, and heterotrophic denitrifying bacteria are taken as the main part, so that nitrification and denitrification can be simultaneously carried out in the microenvironment. The traditional biological denitrification theory considers that the nitrification process can only be completed by autotrophic nitrifying bacteria, and the denitrification process can only be completed by heterotrophic denitrifying bacteria under the anoxic condition. However, with the discovery of aerobic denitrifying bacteria and heterotrophic nitrifying bacteria, the biological explanation of synchronous nitrification and denitrification is gradually accepted.
In sewage treatment, microorganisms store organic substances in water in the form of glycogen (Gly) and poly- β -hydroxyalkanoic acid (PHA) in vivo, and when the utilization of external carbon sources is limited, microorganisms utilize such internal carbon sources for denitrification, which is called endogenous denitrification.
SS (suspended solid amount) in effluent of a sewage treatment plant is also an important content limited in the discharge standard, a secondary sedimentation tank is arranged in a general activated sludge process, sludge can be precipitated, and excessive SS is prevented from entering subsequent treatment, but the secondary sedimentation tank requires larger occupied area and wastes more land area; in general, the inlet water of the biofilm process contains high SS, which cannot be effectively removed in the biochemical process, thus increasing the difficulty of subsequent treatment.
Therefore, based on the above problems and principles, the embodiment of the present application provides a sewage treatment system, which makes full use of raw water carbon source for denitrification, reduces suspended solids in the effluent, and reduces the difficulty and cost of subsequent sewage treatment.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer", etc. are used to indicate an orientation or positional relationship based on that shown in the drawings or that the utility model is used to put it in a usual manner, this is only for the convenience of describing and simplifying the present application, and it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
It should be noted that the features of the embodiments of the present application may be combined with each other without conflict.
Fig. 1 is a schematic view of a sewage treatment system 010 according to an embodiment of the present application. Referring to fig. 1, the present embodiment provides a sewage treatment apparatus, which includes a first treatment apparatus 100 and a second treatment apparatus 200, wherein the first treatment apparatus 100 and the second treatment apparatus 200 have chambers for receiving sewage, and the chambers of the first treatment apparatus 100 and the second treatment apparatus 200 are connected and separated by a filter assembly 140. The first treatment device 100 has a water outlet 110 on a side wall near the top thereof, and the second treatment device 200 has a water inlet 210 on a side wall near the top thereof. The second treatment device 200 is located upstream of the first treatment device 100, that is, the sewage firstly enters into the chamber of the second treatment device 200 from the water inlet 210 of the second treatment device 200, then enters into the chamber of the first treatment device 100 through the filtering assembly 140, and finally flows out from the water outlet 110 of the first treatment device 100. The first processing device 100 has a first biofilm carrier 120 in a chamber thereof, and the first biofilm carrier 120 has a packing rate of 50% or more so that the first biofilm carrier 120 is in a motion-restricted state in the first processing device 100. The chamber of the second processing device 200 is filled with the second biofilm filler 220, and the filling rate is smaller than that of the first biofilm filler 120 in the first processing device 100.
Since the first biofilm carriers 120 having a packing rate of 50% or more are provided in the first treatment apparatus 100, the packing rate is so high that the first biofilm carriers 120 are in a motion-restricted state in the first treatment apparatus 100, that is, the first biofilm carriers 120 cannot freely flow with sewage in the first treatment apparatus 100. The first biofilm carriers 120 with limited motion form a filter bed in the first treatment device 100, and can adsorb and filter suspended solids in the wastewater. The suspended solids are deposited at the bottom of the chamber to form sludge, and the sludge can release a certain carbon source, so that a raw material is provided for denitrification of denitrifying bacteria. The denitrification process of the denitrifying bacteria needs to be performed in an anoxic environment, because the filling rate of the first biofilm fillers 120 is high, the sewage fluidity is poor, a local anoxic area can occur in the first treatment device 100, and conditions are provided for the denitrification process. Therefore, the sewage treatment system 010 in the embodiment of the application can fully utilize the carbon source in the sewage to denitrify, so that the cost of additionally adding the carbon source is reduced, and simultaneously suspended solids in the sewage are filtered, thereby creating favorable conditions for subsequent deep purification. The sewage treatment system 010 that this application embodiment provided has the characteristics that take up an area of for a short time concurrently, and is applicable in underground sewage treatment plant.
In this embodiment, the second treatment apparatus 200 is a device upstream of the first treatment apparatus 100, and is equivalent to a pretreatment of the sewage to be introduced into the first treatment apparatus 100. In this embodiment, the second biofilm carrier 220 of the second treatment apparatus 200 has a lower packing ratio, a higher fluidity, and a larger amount of dissolved oxygen than the packing in the first treatment apparatus 100, and thus the nitrifying bacteria on the second biofilm carrier 220 can be used to treat the sewageAmmonia Nitrogen (NH) in water4 +) Performing conversion (nitrification) to convert ammonia nitrogen into nitrate Nitrogen (NO)2 -、NO3 -). The nitrate nitrogen enters the first treatment apparatus 100, and is then converted into nitrogen gas by denitrification by denitrifying bacteria on the first biofilm carrier 120, while consuming carbon sources. Of course, in the first treatment device 100, the remaining ammonia nitrogen in the second treatment device 200 may exist simultaneously to carry out the nitration process.
It should be understood that in other embodiments, the second treatment device 200 may be omitted; in the sewage treatment system 010, a denitrification device may be further disposed upstream of the second treatment device 200, and a part of the water treated by the first treatment device 100 may be returned to the denitrification device for further denitrification (the first treatment device 100 may have residual nitrate nitrogen). In addition, downstream of the first treatment device 100 of the embodiment of the present application, related equipment for advanced treatment of sewage may be connected to further treat the sewage. In this embodiment, the first treatment device 100 is in direct docking communication with the second treatment device 200, separated by the filter assembly 140. The end of the first treatment device 100 close to the second treatment device 200 is the water inlet of the first treatment device 100; the end of the second treatment device 200 close to the first treatment device 100 is the water outlet of the second treatment device 200. In other alternative embodiments, the first treatment device 100 and the second treatment device 200 can communicate the water inlet of the former with the water outlet of the latter through a pipeline.
In this embodiment, the first treating apparatus 100 is provided with a sludge discharge port 130 on a side wall near the bottom thereof. When the sludge is deposited to a certain amount, the sludge can be released by opening the sludge discharge port 130. For example, the sludge discharge operation is performed every 7 to 10 days.
In the present embodiment, the first biofilm filler 120 may be at least one of high-density polyethylene, and polystyrene; the second biofilm filler 220 may be at least one of high density polyethylene, polystyrene.
Further, the filling rate of the first biofilm filler 120 can be selected from 60% to 75%. The specific gravity of the first biofilm filler 120 is 0.8-1.2, and further 0.92-1.04; preferably, the specific gravity of the first biofilm filler 120 is 0.96-1.04, so that the specific gravity is close to the density of water, the filler is suspended in the water, deposition or floating is avoided, suspended matters are adsorbed, and better reaction conditions are created. In an alternative embodiment, the first biofilm filler 120 has a specific surface area of 200m or more2/m3Preferably, the specific surface area is more than or equal to 600m2/m3The large specific surface area is favorable for adsorption. In the present embodiment, the porosity of the first biofilm filler 120 may be selected to be 50% to 90%, and preferably 70% to 90%. The dry weight of the biofilm hung on the first biofilm carrier 120 is more than or equal to 40 mg/g.
In an alternative embodiment, the filling rate of the second biofilm filler 220 is 10% to 50%. The specific gravity of the second biofilm filler 220 can be selected from 0.8-1.2, and further can be selected from 0.92-1.04; preferably, the specific gravity of the first biofilm filler 120 is 0.96 to 1.04. In an alternative embodiment, the second biofilm filler 220 has a specific surface area of 200m or more2/m3Preferably, the specific surface area is more than or equal to 600m2/m3The large specific surface area is favorable for adsorption. In the present embodiment, the porosity of the first biofilm filler 120 may be selected to be 50% to 90%, and preferably 70% to 90%. The dry weight of the biological film hung on the second biological film filler 220 is more than or equal to 40 mg/g.
An aeration device 230 is optionally provided within the second treatment device 200. The aeration device 230 includes either one or a combination of perforated aeration tubes or micro-porous aerators. As shown in FIG. 1, the aeration device 230 is a perforated aeration pipe, which is provided with at least one aeration hole, and the aperture of the aeration hole is less than or equal to 10mm, preferably 1-5 mm.
In alternative embodiments, the filter assembly 140 comprises a metal screen or perforated plate. Wherein the mesh size of the metal mesh and the perforation size of the perforated plate are smaller than the sizes of the first biofilm packings 120 and the second biofilm packings, preventing the packings of the first treatment device 100 and the second treatment device 200 from being in fluid communication with each other. The filtering component 140 can be made of stainless steel, and the aperture ratio is 30-60%, preferably 40-55%.
The working principle and the beneficial effects of the sewage treatment system 010 of the embodiment of the application include:
when the sewage treatment system 010 of the embodiment of the present application is in use, sewage enters the second treatment device 200 from the water inlet 210 and is mixed with the second biofilm fillers 220. Ammonia nitrogen in the sewage is converted into nitrate nitrogen by the gas generated from the aeration device 230 and the microorganisms on the second biofilm carriers 220. The sewage then enters the first treatment device 100 through the filtering assembly 140, the first treatment device 100 is provided with the first biofilm fillers 120 with high filling rate, and the first biofilm fillers 120 can play a role in filtering to filter out a large amount of suspended solids in the sewage, and the suspended solids are deposited as sludge. And because the filling rate is high, sewage mobility is little, and the anoxic zone exists in the cavity, provides the environment of denitrification for the denitrifying bacteria on first biofilm carrier 120. In addition, the sludge releases a certain carbon source, so that raw materials are provided for denitrification, and the total amount of the sludge is reduced. After the denitrification process, the nitrate nitrogen is changed into nitrogen and removed from the sewage. The treated sewage is discharged from the water outlet 110, or enters the next advanced treatment link, or flows back to the denitrification equipment to continue denitrification. The sludge of the first treatment apparatus 100 may be periodically discharged through the sludge discharge port 130. Therefore, the wastewater treatment system provided by the embodiment of the application can realize the functions of nitrification, denitrification, suspended solid removal and the like, reduces suspended solids while denitrifying, and provides favorable conditions for subsequent advanced treatment. And the carbon source is from sludge, so that the external carbon source feeding is reduced, and the cost is reduced.
In summary, the filling rate of the first biofilm filler in the first treatment device of the sewage treatment system provided by the embodiment of the application reaches more than 50%. In the sewage treatment process, the first biological membrane filler adsorbs and decomposes organic matters in the sewage through microorganisms on the surface, and the first biological membrane filler has a high filling rate, so that a filter bed can be formed, and a large amount of suspended solids in the sewage can be adsorbed and filtered. Reduce a large amount of suspended solids (reduce SS) in the sewage, and is favorable for subsequent deep purification of the sewage. In addition, the first biological membrane filler with high filling rate can reduce the mobility in the first treatment device, so that an anoxic state locally appears in the first treatment device, the first biological membrane filler can realize denitrification and denitrification, the nitrogen content in sewage is reduced, the sludge at the bottom of the first treatment device is subjected to endogenous release and can be used in a denitrification process, the sludge yield is reduced, meanwhile, the amount of carbon sources added from the outside for denitrification is reduced, and the cost is reduced. Therefore, the sewage treatment system can achieve a good effect of removing suspended solids in sewage and has a good denitrification effect.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A sewage treatment system is characterized by comprising a first treatment device, wherein the first treatment device is provided with a chamber for containing sewage, the first treatment device is provided with a water inlet and a water outlet, a first biomembrane filler is arranged in the chamber of the first treatment device, and the filling rate of the first biomembrane filler is more than 50%, so that the first biomembrane filler is in a motion-limited state in the first treatment device.
2. The wastewater treatment system according to claim 1, wherein the first treatment device is provided with a sludge discharge port on a side wall near the bottom thereof, and the water outlet port is opened on a side wall near the top end thereof.
3. The wastewater treatment system of claim 1, wherein the first biofilm filler comprises high density polyethylene, or polystyrene.
4. The wastewater treatment system according to claim 1, wherein the filling rate of the first biofilm filler is 60 to 75%.
5. The wastewater treatment system according to claim 1, wherein the first biofilm carrier has a specific gravity of 0.8 to 1.2.
6. The wastewater treatment system according to claim 1, wherein the first biofilm carrier has a specific surface area of 200m or more2/m3The porosity is 50% -90%.
7. The wastewater treatment system of claim 1, further comprising a second treatment device having a chamber for containing wastewater, the second treatment device being located upstream of and in communication with the first treatment device, the second treatment device being provided with a water inlet, the chamber of the first treatment device being separated from the chamber of the second treatment device by a filter assembly, the chamber of the first treatment device having a second biofilm carrier therein.
8. The wastewater treatment system according to claim 7, wherein the filling rate of the second biofilm filler is 10 to 50%.
9. The wastewater treatment system according to claim 7, wherein an aeration device is provided in the second treatment device.
10. The wastewater treatment system of claim 7, wherein the filter assembly comprises a metal screen or a perforated plate, wherein a mesh size of the metal screen and a perforation size of the perforated plate are smaller than a size of the first biofilm filler and the second biofilm filler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202021090133.XU CN212476285U (en) | 2020-06-12 | 2020-06-12 | Sewage treatment system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021090133.XU CN212476285U (en) | 2020-06-12 | 2020-06-12 | Sewage treatment system |
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| CN212476285U true CN212476285U (en) | 2021-02-05 |
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| CN202021090133.XU Active CN212476285U (en) | 2020-06-12 | 2020-06-12 | Sewage treatment system |
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