CN213771762U

CN213771762U - Internal aeration contact oxidation sewage treatment system

Info

Publication number: CN213771762U
Application number: CN202022780937.9U
Authority: CN
Inventors: 王刚; 邹志华
Original assignee: Gansu Langqian Environmental Science Research Co ltd
Current assignee: Gansu Langqian Environmental Science Research Co ltd
Priority date: 2020-11-26
Filing date: 2020-11-26
Publication date: 2021-07-23
Anticipated expiration: 2030-11-26

Abstract

The utility model discloses an interior aeration contact oxidation sewage treatment system belongs to sewage filter equipment's technical field, solves the lower technical problem of product filtration efficiency of prior art. The system comprises a pre-filtering device (1) and a reaction tank (2) which are communicated, wherein an aeration pipe (21) and a hollow fiber hydrophobic membrane (22) are arranged in the reaction tank (2), and the aeration pipe (21) is arranged at the bottom of the reaction tank (2) and is communicated with an external oxygen therapy device (5); hollow fiber hydrophobic membrane (22) one end opening and circumference are equipped with the micropore, the open end with aeration pipe (21) sealing connection, wherein: the pre-filtering device (1) can filter sewage and convey the sewage to the reaction tank (2); when the aeration pipe (21) aerates, oxygen can enter the hollow fiber hydrophobic membrane (22) and is discharged through the micropores. The utility model discloses be used for perfecting filter equipment's filtering capability, satisfy people to the high requirement of sewage treatment efficiency.

Description

Internal aeration contact oxidation sewage treatment system

Technical Field

The utility model belongs to the technical field of sewage treatment device, especially, relate to an interior aeration contact oxidation sewage treatment system.

Background

The traditional biological contact oxidation method is a biomembrane method process between an activated sludge method and a biological filter, and is characterized in that a filler is arranged in a tank, aeration is carried out on the bottom of the tank to oxygenate sewage, the sewage in the tank body is in a flowing state, so that the sewage is ensured to be fully contacted with the filler in the sewage, the defect of uneven contact between the sewage and the filler in a biological contact oxidation tank is avoided, the organic matter in the wastewater is adsorbed by a biomembrane through nitration reaction denitrification, and under the aerobic condition, the organic matter is oxidized and decomposed by microorganisms, so that the wastewater is purified.

The inventor finds that the prior art has at least the following defects:

1. in a reaction tank in a filtering system in the prior art, after oxygen is released by an aeration pipe, oxygen bubbles flow to the liquid surface too fast, so that the contact time of microorganisms and the oxygen is short, the oxygen dissolving efficiency is low, and the energy consumption is high; the liquid phase forms an aerobic layer, an anoxic layer and an anaerobic layer in turn towards the direction of the biological membrane, and the numerical concentration of BOD-biochemical oxygen demand, NH 3-N-ammonia nitrogen content index and DO-molecular oxygen dissolved in the air in water is gradually reduced from the diffusion process of the liquid phase to the biological membrane, which is unfavorable for nitrification. The oxygen dosage of aeration is increased, and enough DO can penetrate into the biological membrane to play the role of the internal biological membrane, which is unfavorable for the denitrification of heterotrophic bacteria on the outer layer of the biological membrane, so that the sewage treatment efficiency is greatly reduced, and the sewage treatment cost is increased.

2. When the anaerobic layer is close to the biological membrane, the biological membrane growing in the reaction tank has low adhesion degree, and the biological membrane is easy to fall off.

3. The carbon source in the sewage cannot be effectively utilized, and the carbon source needs to be added during denitrification, so that the treatment cost of the sewage is increased.

In view of this, the present invention is especially provided.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an interior aeration contact oxidation sewage treatment system solves the lower technical problem of product sewage treatment efficiency of prior art.

The scheme provides an internal aeration contact oxidation sewage treatment system which comprises a pre-filtering device and a reaction tank which are communicated, wherein an aeration pipe and a hollow fiber hydrophobic membrane are arranged in the reaction tank, and the aeration pipe is arranged at the bottom of the reaction tank and is communicated with an external oxygen delivery device; hollow fiber hydrophobic membrane one end opening and circumference are equipped with the micropore, the open end with aeration pipe sealing connection, wherein: the pre-filtering equipment can filter sewage and convey the sewage to the reaction tank; when the aeration pipe is aerated, oxygen can enter the hollow fiber hydrophobic membrane and is discharged through the micropores. In the sewage close to the position of the hollow fiber hydrophobic membrane, the oxygen content is increased, microorganisms are easier to gather and grow, the sewage treatment efficiency is improved, and the dissolved oxygen efficiency is high, the oxygen utilization efficiency is high, and the energy consumption is low.

The technical scheme of the scheme is that the formation of the biological membrane is just opposite to that of the traditional biological membrane, and the biological membrane is formed from a liquid phase to the direction of the biological membrane respectively: the concentration of BOD and NH3-N in the biological membrane changes in a reverse way to that of DO in the biological membrane, the concentration of BOD and NH3-N gradually decreases along with the diffusion process from the liquid phase to the biological membrane, and the DO gradually decreases from the direction close to the membrane to the direction of the liquid phase. The microorganisms can propagate and live in a large amount on the biomembrane because of sufficient oxygen and sufficient contact time, the denitrification process is greatly improved, the denitrification efficiency is improved, in addition, the denitrification process is close to the liquid phase with the highest substrate concentration gradient, the substrate carbon source can be directly utilized for denitrification, and the problem of insufficient carbon source in the traditional sewage biological treatment is solved. Substrates, substances that bind to specific enzymes, when the enzyme binds to its specific substrate, are catalytically converted to other substances under appropriate conditions.

In a preferable or optional scheme, one end of the hollow fiber hydrophobic membrane is provided with an opening structure, the other end of the hollow fiber hydrophobic membrane is provided with a closed structure, the structure is used for prolonging the discharge time of oxygen in sewage, the oxygen can be more fully contacted with microorganisms, simultaneously, the oxygen content in the sewage is improved, the oxygen in an aerobic layer close to a liquid phase of the biological membrane is more fully, the propagation and growth of the microorganisms are facilitated, and therefore the denitrification process is promoted.

In a preferred or alternative scheme, a bracket is further installed in the reaction tank, the bracket is preferably installed in the central area of the reaction tank or close to the central area, the open end of the hollow fiber hydrophobic membrane is hermetically connected with the aeration pipe, and the other end of the hollow fiber hydrophobic membrane is fixedly installed on the bracket. This structure is installed hollow fiber hydrophobic membrane in the reaction tank with vertical mode, and oxygen is because buoyancy effect rebound in sewage to oxygen has certain pressure under oxygen therapy setting effect, thereby, oxygen can effectively discharge in the micropore of hollow fiber hydrophobic membrane is installed to vertical direction, avoids the influence of dynamic water pressure or hydrostatic pressure in the sewage, and reduces the emission of oxygen.

In a preferred or alternative aspect, the support comprises legs and a support surface to which the legs are connected, wherein: the support legs are arranged in the reaction tank and used for supporting the support surface; the bracket surface is connected with the non-opening end of the hollow fiber hydrophobic membrane in a sealing way. The landing leg is automatic telescopic link, because the change of reaction tank sewage liquid level height, the condition that the hollow fiber hydrophobic membrane exists part exposure liquid level causes the loss of oxygen, consequently, the landing leg is automatic telescopic link, can adjust the support face below the liquid level, ensures that hollow fiber hydrophobic membrane is whole to be drowned in sewage.

In a preferred or alternative aspect, the pre-filtration apparatus includes a septic tank and a filtration tank in communication with the septic tank, wherein: the septic tank is used for precipitating impurities in sewage, and the precipitated substances are conveyed to the filter box for filtering.

In a preferred or alternative scheme, a plurality of grids are installed in the filter box, and the filtering meshes of the grids are reduced in sequence along the water flow direction. The purpose of filtration is, namely, the size of the surface holes of the grating, the arrangement of the gratings is to perform deep anaerobic fermentation, retain and precipitate parasitic ova, sterilize and kill the ova, generally, excrement liquid flowing into the last grating is decomposed, germs and ova in the excrement liquid are basically killed and removed, and the excrement liquid can be used for fertilizing.

In a preferred or optional scheme, the device further comprises a regulating tank, wherein the regulating tank is communicated with the pre-filtering device and the reaction tank respectively and is used for the condition of sewage parameters. For example, the adjustment of parameters such as Ph value, temperature or pressure, etc. satisfies the environmental conditions of sewage treatment in the reaction tank.

Compared with the prior art, the utility model provides a technical scheme includes following beneficial effect:

according to the technical scheme, the hollow fiber hydrophobic membrane which is connected with the aeration pipe in a sealing mode is arranged in the reaction tank, and micropores, such as nanopores, are formed in the circumferential direction of the hollow fiber hydrophobic membrane. During aeration of the aeration pipe, oxygen can enter the hollow fiber hydrophobic membrane and is discharged through the micropores, so that the time of oxygen floating out of a sewage surface in the reaction tank is prolonged, and the oxygen is formed from a liquid phase to a biological membrane direction respectively: anaerobic layer, anoxic layer and good oxygen layer, with traditional sewage treatment opposite, be close to the biofilm formation good oxygen layer, do benefit to the growth and the reproduction of microorganism, the denitrification process improves greatly, and denitrogenation efficiency can promote, and moreover, the denitrification process is close to the liquid phase that substrate concentration gradient is the highest, can directly utilize the substrate carbon source to carry out the denitrification, adds or need not plus the carbon source a little, and this has solved the problem that the carbon source is not enough in traditional sewage biological treatment.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view of the process flow of the internal aeration contact oxidation sewage treatment system of the present invention;

FIG. 2 is a schematic view of the mounting structure of the aeration pipe and the bracket in the reaction tank of the present invention;

fig. 3 is a cross-sectional view of the grid of the present invention.

Wherein: 1. a pre-filtration device; 2. a reaction tank; 21. an aeration pipe; 22. a hollow fiber hydrophobic membrane; 231. a support leg; 232. a support surface; 233. a strut; 11. a septic tank; 12. a filter box; 121. a grid; 3. a regulating tank; 4. an ecological pond; 5. an oxygen delivery device.

Detailed Description

In order to make the technical field better understand the solution of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and the detailed description. 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 otherwise specified.

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only a few embodiments of the invention, and not a full range of embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

The internal aeration contact oxidation sewage treatment system as shown in fig. 1 to 3 comprises a pre-filtering device 1 and a reaction tank 2 which are communicated, wherein the pre-filtering device 1, for example, a septic tank, and sewage is subjected to the sedimentation of large granular matters. The reaction tank 2 is internally provided with an aeration pipe 21 and a hollow fiber hydrophobic membrane 22, the aeration pipe 21 is arranged at the bottom of the reaction tank 2 and is communicated with an external oxygen therapy device 5, and the oxygen therapy device 5 is arranged in the prior art. The hollow fiber hydrophobic membrane 22 is open at one end and is circumferentially provided with micropores, for example, nanopores. The hollow fiber hydrophobic membranes 22 can be made of hydrophilic materials in the prior art, and the open ends of the hollow fiber hydrophobic membranes are connected with the aeration pipe 21 in a sealing manner, for example, a plurality of hollow fiber hydrophobic membranes 22 form a bundle and are sealed by using sealing rings, holes matched with the hollow fiber hydrophobic membranes in size are formed in the surface of each sealing gasket, and a plurality of hollow fiber hydrophobic membranes are installed on the aeration holes of the aeration pipe after being installed on the sealing gaskets, or other sealing manners in the prior art can be adopted. The pre-filtering device 1 can filter and convey sewage to the reaction tank 2, and oxygen can enter the hollow fiber hydrophobic membrane 22 and be discharged through the micropores when the aeration pipe 21 is aerated.

The working principle is as follows: organisms are attached to the hollow fiber hydrophobic membrane 22 and grow, and the biofilm is composed of zoogloea, filamentous bacteria, fungi, protozoa, and metazoan. After oxygen or air is discharged through the micropores, the oxygen or air is respectively formed from liquid phase to the direction of the biological membrane: the anaerobic layer, the anoxic layer and the aerobic layer are adjacent to the biological membrane and are the aerobic layers, so that the concentration change of the biochemical oxygen demand and the ammonia nitrogen content index in the biological membrane and the change condition of the value concentration of molecular oxygen in the air dissolved in water in the biological membrane are opposite to the traditional process, the concentration of the biochemical oxygen demand and the ammonia nitrogen content index is gradually reduced along with the diffusion process from a liquid phase to the biological membrane, and the concentration of oxygen dissolved in water is gradually reduced from the direction close to the membrane to the direction of the liquid phase, the arrangement can ensure that the microorganism has sufficient oxygen on the biomembrane and enough contact time, can propagate and survive in a large quantity, greatly improves the denitrification process, improves the denitrification efficiency, in addition, the denitrification process is close to the liquid phase with the highest substrate concentration gradient, the substrate carbon source can be directly utilized for denitrification, and a carbon source is slightly or not added, so that the problem of insufficient carbon source in the traditional sewage biological treatment is solved.

As an alternative embodiment, hollow fiber hydrophobic membranes 22 are arranged in an open configuration at one end and a closed configuration at the other end. The open end is connected with the aerator pipe in a sealing way, oxygen is discharged only through the micropores in the hollow fiber hydrophobic membrane 22, the time for discharging oxygen out of the sewage surface in the reaction tank is prolonged, the oxygen concentration of the aerobic layer close to the biological membrane is improved, sufficient oxygen is beneficial to the growth of microorganisms, and the denitrification process is improved.

As an alternative embodiment, as shown in fig. 2, the present disclosure provides a hollow fiber hydrophobic membrane 22 mounting manner, which does not represent the only mounting manner when it is required. For example, a bracket is arranged in the reaction tank 2, the open end of the hollow fiber hydrophobic membrane 22 is hermetically connected with the aeration pipe 21, and the other end is fixedly arranged on the bracket. The support includes legs 231 and a support surface 232 connected to the legs 231, and the legs 231 are installed in the reaction tank 2 to support the support surface 232. The bracket surface 232 is sealingly connected to the non-open end of the hollow fiber hydrophobic membrane 22.

Further, the rack surface 232 is provided in a frame structure, for example, a rectangular or square frame, and a plurality of support rods 233 are installed in the rack surface 232, and the support rods 233 are hermetically fixed to the non-open ends of the hollow fiber hydrophobic membranes 22.

As an alternative embodiment, the above-mentioned support is provided, and the support leg 231 is an automatic telescopic rod, and the height of the support leg is adjustable in the vertical direction. Automatic telescopic link adopts among the prior art waterproof product can, because the change of reaction tank sewage liquid level height, the hydrophobic membrane 22 of hollow fiber need submerge completely in the sewage surface of water, avoids oxygen direct discharge to the air in, causes extravagant phenomenon, consequently, landing leg 231 is automatic telescopic link, can adjust the mounting surface 232 below the liquid level, ensures that the hydrophobic membrane 22 of hollow fiber is whole to bury in sewage.

As an alternative embodiment, the pre-filtering device 1 comprises a septic tank 11 and a filtering tank 12 communicated with the septic tank 11, wherein the septic tank 11 is used for precipitating impurities in sewage, and the precipitated substances are conveyed to the filtering tank 12 for filtering. The filtering box 12 is installed with a plurality of grills 121, and the filtering meshes of the plurality of grills 121 are sequentially reduced along the water flow direction, for example, 3 grills are installed, the last grille is a 80 mesh filtering net, and the structure of the last grille is a 80 mesh filtering net is shown in fig. 3. Sewage is meticulous in a plurality of grid grooves and is filtered, get rid of suspension or floated large granule material, and, large granule material is kept apart the back, owing to receive the impact of rivers, its inside or surperficial organic matter gets into the reaction tank along with the rivers direction, the organic matter contains the carbon source, consequently, add slightly or need not plus the carbon source, this has solved traditional sewage biological treatment process, the not enough technical problem of carbon source practices thrift economic cost, it needs to point out, large granule material need regularly clear up, the condition of avoiding taking place the jam appears.

As an optional embodiment, the device further comprises a regulating tank 3, wherein the regulating tank 3 is respectively communicated with the pre-filtering device 1 and the reaction tank 2 and is used for the condition of sewage parameters. And the adjusting tank 3 is used for adjusting parameters such as the temperature or the pH value or the water flow speed of the sewage entering the reaction tank and improving the purification efficiency of the sewage.

Further, the purified sewage in the reaction tank 2 is transferred to an ecological pond 4, and the ecological pond 4, for example, is planted with water-resistant plants, cultured fish, duck, etc. to form a complex ecosystem through a food chain so as to improve the organic matter of the purified sewage, so that the purified sewage can be used as a fertilizer for irrigation. The ecological pond 4 controls the effective retention time according to different modes, enables water to flow along a certain direction, and further achieves the water quality purification effect through filtration, adsorption, precipitation, plant absorption, microbial decomposition and the like under the combined action of physics or chemistry or biology. A fountain pump can be loaded in the ecological pond 4, so that the effects of aeration, oxygenation and landscaping are achieved, and the effective circulation of water is realized.

The product provided by the utility model is introduced in detail above. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the core concepts of the present invention. It should be noted that, for a person skilled in the art, without departing from the inventive concept of the present invention, several improvements and modifications can be made to the invention, and these improvements and modifications also fall within the scope of the claims of the invention.

Claims

1. An internal aeration contact oxidation sewage treatment system is characterized by comprising a pre-filtering device (1) and a reaction tank (2) which are communicated, wherein an aeration pipe (21) and a hollow fiber hydrophobic membrane (22) are arranged in the reaction tank (2), and the aeration pipe (21) is arranged at the bottom of the reaction tank (2) and is communicated with an external oxygen delivery device (5); hollow fiber hydrophobic membrane (22) one end opening and circumference are equipped with the micropore, the open end with aeration pipe (21) sealing connection, wherein:

the pre-filtering device (1) can filter sewage and convey the sewage to the reaction tank (2); when the aeration pipe (21) aerates, oxygen can enter the hollow fiber hydrophobic membrane (22) and is discharged through the micropores.

2. An internal aeration contact oxidation sewage treatment system according to claim 1, wherein the hollow fiber hydrophobic membrane (22) is provided in an open structure at one end and in a closed structure at the other end.

3. An internal aeration contact oxidation sewage treatment system according to claim 1 or 2, wherein a support is further installed in the reaction tank (2), the open end of the hollow fiber hydrophobic membrane (22) is hermetically connected with the aeration pipe (21), and the other end of the hollow fiber hydrophobic membrane is fixedly installed on the support.

4. An internal aeration contact oxidation wastewater treatment system according to claim 3, wherein the frame comprises legs (231) and a frame face (232) to which the legs (231) are connected, wherein:

the supporting legs (231) are arranged in the reaction tank (2) and used for supporting the support surface (232);

the bracket surface (232) is connected with the non-open end of the hollow fiber hydrophobic membrane (22) in a sealing way.

5. An internal aeration contact oxidation wastewater treatment system according to claim 4, wherein the legs (231) are automatic telescopic rods.

6. An internal aeration contact oxidation sewage treatment system according to claim 1, wherein the pre-filtering device (1) comprises a septic tank (11) and a filtering tank (12) communicating with the septic tank (11), wherein:

the septic tank (11) is used for precipitating impurities in sewage, and the precipitated substances are conveyed to the filter box (12) for filtering.

7. An internal aeration contact oxidation sewage treatment system according to claim 6, wherein a plurality of grilles (121) are installed in the filtering tank (12), and the filtering meshes of the plurality of grilles (121) are sequentially reduced in the water flow direction.

8. An internal aeration contact oxidation sewage treatment system according to claim 1, further comprising a conditioning tank (3), said conditioning tank (3) being in communication with said pre-filtering device (1) and said reaction tank (2), respectively, for conditions of sewage parameters.

9. The internal aeration contact oxidation sewage treatment system according to claim 1, further comprising an ecological pond to which the sewage purified in the reaction tank is transferred.