1. A sewage denitrification treatment device is characterized by comprising a sewage tank (7), sponge fillers (11) and a stirring mechanism (1), wherein the stirring mechanism (1) is of a cylindrical structure, and stirring blades (3) are arranged on the outer side of the circumference of the stirring mechanism at intervals; the stirring mechanism (1) is vertically arranged in the sewage tank (7); the sponge filler (11) is arranged on the water surface of the sewage pool (7) in a suspending manner.

2. The sewage denitrification treatment device according to claim 1, wherein the sponge filler (11) is a hydrophilic polyurethane material and is provided with a plurality of holes.

3. The sewage denitrification treatment device according to claim 2, wherein barbed wires are distributed on the surface of the holes of the sponge packing (11).

4. The sewage denitrification treatment device according to claim 2, wherein the sponge filler (11) has a cubic structure of 1.5-2.5 cm and a density of 15-20 kg/m³The specific surface area was 0.38～0.5×10⁶m²/m³。

5. The denitrification facility for wastewater according to claim 1, wherein the agitation mechanism (1) is disposed in the surface of the wastewater tank (7) in a downstream, fully submerged manner.

6. The denitrification sewage treatment plant according to claim 1, wherein the lagoon (7) is rectangular with rounded corners for smooth transition; the stirring mechanisms (1) are arranged at the front end and the rear end of the center line of the sewage tank (7), and a partition plate (10) is arranged between the two stirring mechanisms (1).

7. The denitrification treatment apparatus for sewage according to claim 6, wherein the sewage tank (7) is provided with a water inlet pipe (8), and the water inlet direction of the water inlet pipe (8) pushes the water flow direction towards the stirring blade (3).

8. The denitrification facility for wastewater according to claim 6, wherein the wastewater tank (7) is provided with a water outlet (9), and the water outlet (9) is provided with a barrier device.

9. A sewage denitrification treatment process method is characterized by comprising the following steps:

s1: the sewage tank is selected from an anaerobic tank, an anoxic tank or an aerobic tank of a sewage biological treatment section;

s2: the sponge filler is scattered on the sewage surface of the sewage pool;

s3: the stirring mechanism is driven to rotate along with water flow, and the rotating speed is 10-30 r/min;

s4: the stirring mechanism forms a stable laminar flow state for sewage water flow, and the sponge filler disperses and floats along with the water flow;

s5: the sponge filler with a hole structure strengthens the structural integrity of flora in the anaerobic pool or the anoxic pool, and improves the impact resistance; the sponge filler with the hole structure forms a micro-reaction system in the aerobic tank, so that a micro-oxygen environment and space are created, and the nitrogen degradation efficiency is improved.

Background

The key of high-efficiency denitrification technologies such as synchronous nitrification and denitrification, short-cut nitrification and denitrification and the like is to form a dissolved oxygen microenvironment, granular sludge is preferred, but the difficulty of engineering implementation and operation control is higher, the addition of fillers to improve the treatment capacity is generally known to be mature, the effect of suspended fillers is better than that of suspended fillers, and the granular sponge fillers can achieve a good dissolved oxygen microenvironment effect.

The sponge filler has larger specific surface area, provides larger attachment space for microorganisms, has rough surface and is easy to form a film, and single sponge particle can form a micro-reactor, thereby not only completing nitrification and denitrification, but also having the function of sludge hydrolysis and reduction. However, the sponge filler is easy to accumulate in a mixed flow state, so that the shearing force of water flow is insufficient, an aged biological membrane is easy to accumulate, the biological membrane is not dropped for a long time, and when a new biological membrane cannot replace the old biological membrane, the biological activity of a system is low; the reason is that the adopted stirrer or aeration mechanism can form water flow speed difference in the pool, the sponge filler can be gathered at a place with low flow speed due to the inertia effect, oxygen transfer and mass transfer in the filler film are not facilitated, and the nitrogen removal effect is further influenced.

Disclosure of Invention

The invention provides a sewage denitrification treatment device and a process method thereof, aiming at solving the problems that sponge fillers are gathered and blocked at a place with low flow velocity due to the inertia effect of poor water flow velocity in the existing pool, so that the biological activity of the system is low, oxygen transfer and mass transfer in filler films are not facilitated, and the nitrogen removal effect is further influenced.

The invention is realized by the following technical scheme.

A sewage denitrification treatment device comprises a sewage pool, sponge fillers and a stirring mechanism, wherein the stirring mechanism is of a cylindrical structure, and stirring blades are arranged on the outer side of the circumference of the stirring mechanism at intervals; the stirring mechanism is vertically arranged in the sewage tank; the sponge filler is arranged on the water surface of the sewage pool in a suspending manner. The stirring mechanism vertically immersed in the sewage is driven at an ultralow rotating speed through the driving mechanism, and the stirring blades form a stable laminar flow state on the sewage, so that the problem of sponge filler aggregation is effectively avoided, and the oxygen transfer efficiency and the mass transfer efficiency are effectively enhanced; the stability and the impact resistance of a biological system are improved, and the mechanical breaking of a biological membrane is avoided; the single sponge filler can form an independent micro-reactor in the sewage tank, micro-aerobic environment distribution is realized, after the nitrogen-containing sewage enters the sewage tank, short-range nitrification and denitrification, synchronous nitrification and denitrification, anaerobic ammonia oxidation and the like can be applied to the denitrification process, and compared with the traditional nitrification and denitrification process, the oxygen demand can be effectively reduced, an external carbon source is not required to be added, the energy consumption is saved, and the treatment cost is reduced; is a biological reaction method with low energy consumption and low cost; meanwhile, the combination of the vertical stirring mechanism and the sponge filler can solve the problem of the traditional filler mixing flow state.

The invention is further improved in that the sponge filler is made of hydrophilic polyurethane material and is provided with a plurality of holes. The sponge filler has higher porosity, good mechanical strength and low cost; the surface and the internal holes of the sponge filler provide larger surface area and stable environment for the rapid formation of the biological film.

The invention is further improved in that the surface of the holes of the sponge filler is distributed with barbed wires. The barbed wire can increase the surface roughness of the sponge filler holes and provide good conditions for the growth and enrichment of microorganisms.

The invention is further improved in that the sponge filler is in a cubic structure of 1.5-2.5 cm and has a density of 15-20 kg/m³The specific surface area is 0.38 to 0.5 x 10⁶m²/m³. The sponge filler is in a suspension state on the sewage surface, and can further cut bubbles in the matrix, thereby improvingThe biomembrane on the filler has the utilization rate of oxygen, and is favorable for oxygen transfer and mass transfer of the matrix to the biomembrane and between the insides of the biomembrane, thereby improving the denitrification reaction efficiency.

The invention is further improved in that the stirring mechanism is arranged in the water surface of the sewage pool in a downstream and fully submerged manner. The stirring mechanism is driven along the water flow by the driving mechanism, and the stirring mechanism is driven and combined with the stirring mechanism along the water flow direction, so that the driving energy consumption of the driving mechanism is effectively reduced, the energy is saved, and the mixing speed of sewage and activated sludge and the sewage treatment efficiency can be improved.

The invention is further improved in that the sewage tank is rectangular, and corners of the sewage tank are in smooth transition through round corners; the stirring mechanisms are arranged at the front end and the rear end of the center line of the sewage pool, and a partition plate is arranged between the two stirring mechanisms. The sponge filler on the two sides is separated by the partition board, vortex aggregation is prevented from being formed, the sponge filler is uniformly dispersed on the sewage surface, and the unicity of the water flow direction and the stability of the water flow are guaranteed.

The sewage pool is further improved in that a water inlet pipe is arranged in the sewage pool, and the water inlet direction of the water inlet pipe faces to the water flow direction pushed by the stirring blades. The water inlet of the water inlet pipe has a boosting effect on the stirring blades, and the self-driving energy consumption is saved.

The invention is further improved in that a water outlet is arranged in the sewage pool, and a blocking net device is arranged at the water outlet. The blocking device can prevent the sponge filler from entering the next working section or blocking the water outlet along with water flow, and ensure good reaction effect of the sponge filler.

A sewage denitrification treatment process method comprises the following steps:

s1: the sewage tank is selected from an anaerobic tank, an anoxic tank or an aerobic tank of a sewage biological treatment section;

s2: the sponge filler is scattered on the sewage surface of the sewage pool;

s3: the stirring mechanism is driven to rotate along with water flow, and the rotating speed is 10-30 r/min;

s4: the stirring mechanism forms a stable laminar flow state for sewage water flow, and the sponge filler disperses and floats along with the water flow;

s5: the sponge filler with a hole structure strengthens the structural integrity of flora in the anaerobic pool or the anoxic pool, and improves the impact resistance; the sponge filler with the hole structure forms a micro-reaction system in the aerobic tank, so that a micro-oxygen environment and space are created, and the nitrogen degradation efficiency is improved.

According to the technical scheme, the invention has the beneficial effects that: the stirring mechanism vertically immersed in the sewage is driven at an ultralow rotating speed through the driving mechanism, and the stirring blades form a stable laminar flow state on the sewage, so that the problem of sponge filler aggregation is effectively avoided, and the oxygen transfer efficiency and the mass transfer efficiency are effectively enhanced; the stability and the impact resistance of a biological system are improved, and the mechanical breaking of a biological membrane is avoided; the single sponge filler can form an independent micro-reactor in the sewage tank, micro-aerobic environment distribution is realized, after the nitrogen-containing sewage enters the sewage tank, short-range nitrification and denitrification, synchronous nitrification and denitrification, anaerobic ammonia oxidation and the like can be applied to the denitrification process, and compared with the traditional nitrification and denitrification process, the oxygen demand can be effectively reduced, an external carbon source is not required to be added, the energy consumption is saved, and the treatment cost is reduced; is a biological reaction method with low energy consumption and low cost; meanwhile, the combination of the vertical stirring mechanism and the sponge filler can solve the problem of the traditional filler mixing flow state.

Drawings

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

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a schematic top view of a stirring mechanism according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of the sponge filler according to the embodiment of the present invention.

In the drawings: 1. stirring mechanism, 2, barrel, 3, stirring vane, 4, reinforcing rib plate, 5, shrouding, 6, pivot, 7, effluent water sump, 8, inlet tube, 9, delivery port, 10, baffle, 11, sponge filler.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the present embodiment, and it is apparent that the embodiments described below are only a part of embodiments of the present invention, and not all embodiments. 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 scope of protection of this patent.

As shown in fig. 1 and 2, a sewage denitrification treatment device comprises a sewage tank 7, a plurality of sponge fillers 11 and a stirring mechanism 1; the sponge filler 11 is arranged on the water surface of the sewage pool 7 in a suspending way; the stirring mechanism 1 comprises a vertical rotating shaft 6, a vertical annular cylinder 2 and vertical stirring blades 3 arrayed on the outer circumferential surface of the cylinder 2; the upper end surface and the lower end surface of the cylinder body 2 are respectively provided with a sealing plate 5 in a sealing way, and the center position of the sealing plate 5 is fixedly connected with the rotating shaft 6; the upper end of the rotating shaft 6 is in transmission connection with a driving mechanism; the stirring mechanism 1 is vertically arranged in the sewage tank 7.

The stirring mechanism 1 vertically immersed in the sewage is driven at an ultra-low rotating speed by the driving mechanism, and the stirring blades 3 on the outer circumferential surface of the cylinder 2 form a stable laminar flow state for the sewage, so that the problem of aggregation of the sponge filler 11 is effectively avoided, and the oxygen transfer efficiency and the mass transfer efficiency are effectively enhanced; the stability and the impact resistance of a biological system are improved, and the mechanical breaking of a biological membrane is avoided; the single sponge filler 11 can form an independent micro-reactor in the sewage tank 7, micro-aerobic environment distribution is realized, and after nitrogen-containing sewage enters the sewage tank 7, short-range nitrification and denitrification, synchronous nitrification and denitrification, anaerobic ammonia oxidation and the like can be applied to a denitrification process; is a biological reaction method with low energy consumption and low cost; meanwhile, the combination of the vertical stirring mechanism 1 and the sponge filler 11 can solve the problem of the traditional filler mixing flow state.

As shown in fig. 3, the sponge filler 11 is made of hydrophilic polyurethane material and has a plurality of holes. The sponge filler 11 is a porous net structure. The holes are different in size and shape, and the large holes, the small holes and the micropores are mutually interpenetrated and distributed. The sponge filler 11 has high porosity, good mechanical strength and low cost; the surface and the internal holes of the sponge filler 11 provide a larger surface area and a stable environment for the rapid formation of the biological membrane.

Wherein, the surface of the hole of the sponge filler 11 is distributed with barbed wires. The barbed wire can increase the surface roughness of the holes of the sponge filler 11, and provides good conditions for the growth and enrichment of microorganisms.

As shown in FIG. 3, the sponge filler 11 has a cubic structure of 1.5-2.5 cm and a density of 15-20 kg/m³The specific surface area is 0.38 to 0.5 x 10⁶m²/m³. The sponge filler 11 is in a suspension state on the sewage surface, can further cut bubbles in the matrix, improves the utilization rate of the biomembrane on the filler to oxygen, is favorable for oxygen transfer and mass transfer of the matrix to the biomembrane and between the insides of the biomembrane, and improves the denitrification reaction efficiency.

The stirring mechanism 1 is arranged in the water surface of the sewage pool 7 in a downstream and full-submerged manner. The stirring mechanism 1 is driven along the water flow through the driving mechanism (namely, the water flow direction is consistent with the sewage direction pushed by the stirring mechanism 1), the stirring mechanism 1 is driven along the water flow direction and combined with the stirring mechanism 1, the driving energy consumption of the driving mechanism is effectively reduced, the energy is saved, and the mixing rate of sewage and activated sludge and the sewage treatment efficiency can be improved.

As shown in fig. 2, the stirring blades 3 are vertically arranged, and the installation angle is 15-45 °; the installation angle of the stirring blade 3 refers to the included angle between the installation and fixing position of the stirring blade 3 and the plane where the axial lead of the cylinder 2 is located and the stirring blade 3. The interval between adjacent stirring blades 3 is 1-2 stirring blade 3 widths; the width of the stirring blade 3 is 1/3-1/8 of the diameter of the cylinder 2. Through the stirring vane 3 that the slope set up and the stirring vane 3 of rational arrangement, can realize steadily promoting sewage, guarantee to form stable laminar flow, avoid the mud floc breakage and influence denitrification reaction effect. And a reinforcing rib plate 4 is connected and supported between one side of the stirring blade 3 of the stirring mechanism 1 close to the cylinder body 2 and the outer circumferential surface of the cylinder body 2. The triangular structure is formed by the reinforcing rib plates 4, the stirring blades 3 and the outer circumferential surface of the barrel 2, the structural strength is high, and the stable plug flow effect of the stirring blades 3 is ensured.

Wherein, the one end that stirring vane 3 kept away from barrel 2 is equipped with the arc turn-ups that deviates from its incline direction. In the rotation process of the stirring mechanism 1, the water flow pushed by the arc-shaped flanging is gathered to a certain degree, so that the larger radial diffusion degree is avoided, and the microbial flocs are prevented from being smashed by being impacted with the pool wall.

As shown in fig. 2 and fig. 1, the connection position of the cylinder 2 and the outermost reinforcing rib plate 4 and the fixed installation position of the adjacent stirring blade 3 and the cylinder 2 coincide. The manufacturing process is simpler and easier, and the reinforcing rib plate 4 at the outermost side and the adjacent stirring blade 3 are mutually abutted, so that the structural performance of the stirring blade 3 is greatly improved.

As shown in fig. 1, the sewage tank 7 is rectangular, and the corners of the sewage tank are smoothly transited through round corners; the stirring mechanisms 1 are arranged at the front end and the rear end of the central line of the sewage pool 7, and a partition plate 10 is arranged between the two stirring mechanisms 1. The sponge fillers 11 on the two sides are separated by the partition plate 10, vortex aggregation is prevented from being formed, the sponge fillers 11 are uniformly dispersed on the sewage surface, and the unicity of the water flow direction and the stability of water flow are guaranteed.

As shown in fig. 1, a water inlet pipe 8 is arranged in the sewage tank 7, and the water inlet direction of the water inlet pipe 8 is towards the water flow direction pushed by the stirring blades 3. The water inlet of the water inlet pipe 8 has a boosting effect on the stirring blades 3, and the self-driving energy consumption is saved.

As shown in fig. 1, a water outlet 9 is arranged in the sewage tank 7, and a blocking device is arranged at the water outlet 9. The blocking device can prevent the sponge filler 11 from entering the next working section or blocking the water outlet 9 along with water flow, and ensure the good reaction effect of the sponge filler 11.

A sewage denitrification treatment process method comprises the following steps:

s1: the sewage tank is selected from various sewage biochemical treatment sections such as an anaerobic tank, an anoxic tank or an aerobic tank of the sewage biological treatment section;

s2: the sponge filler is scattered on the sewage surface of the sewage pool;

s3: the stirring mechanism is driven to rotate along with water flow, and the rotating speed is controlled to be 10-30 r/min (ultra-low rotating speed);

s4: the stirring mechanism forms a stable laminar flow state for sewage water flow, and the sponge filler disperses and floats along with the water flow, so that the sponge filler is prevented from being gathered;

s5: in the anaerobic pool or the anoxic pool, the sponge filler strengthens the structural integrity of flora and improves the impact resistance; a micro-reaction system is formed in the aerobic tank, and the sponge filler creates a micro-oxygen environment and space, so that the nitrogen degradation efficiency is improved.

The sewage denitrification treatment device and the process method thereof have simple structure, the stirring mechanism vertically immersed in the sewage is driven at ultra-low rotating speed by the driving mechanism, and the stirring blades on the outer circumferential surface of the cylinder body form a stable laminar flow state for the sewage, thereby effectively avoiding the problem of sponge filler aggregation and effectively enhancing the oxygen transfer and mass transfer efficiency; the stability and the impact resistance of a biological system are improved, and the mechanical breaking of a biological membrane is avoided; the single sponge filler can form an independent micro-reactor in the sewage tank, micro-aerobic environment distribution is realized, after the nitrogen-containing sewage enters the sewage tank, short-range nitrification and denitrification, synchronous nitrification and denitrification, anaerobic ammonia oxidation and the like can be applied to the denitrification process, and compared with the traditional nitrification and denitrification process, the oxygen demand can be effectively reduced, an external carbon source is not required to be added, the energy consumption is saved, and the treatment cost is reduced; is a biological reaction method with low energy consumption and low cost; meanwhile, the combination of the vertical stirring mechanism and the sponge filler can solve the problem of the traditional filler mixing flow state.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The terms "upper", "lower", "outside", "inside" and the like in the description and claims of the present invention and the above drawings are used for distinguishing relative positions if any, and are not necessarily given qualitatively. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.