CN218810843U

CN218810843U - Sewage treatment device based on autotrophic nitrogen and phosphorus removal biological carrier

Info

Publication number: CN218810843U
Application number: CN202222388714.7U
Authority: CN
Inventors: 赵晴; 邱亮洋; 梁慧宇; 吕慧; 孙连鹏; 陈奔
Original assignee: Guangzhou University
Current assignee: Guangzhou University
Priority date: 2022-09-08
Filing date: 2022-09-08
Publication date: 2023-04-07
Anticipated expiration: 2032-09-08

Abstract

The utility model belongs to the technical field of sewage biological treatment, concretely relates to sewage treatment plant based on autotrophic nitrogen and phosphorus removal biological carrier. The sewage treatment device comprises a water inlet device, a packing layer and an overflow trough; the device adopts the upflow treatment, sewage enters from a bottom water pipe, and flows out through an overflow trough after being treated by a packing layer. The packing layer is filled with an autotrophic nitrogen and phosphorus removal biological carrier, and the carrier is prepared by mixing sulfur, pyrite, hydrated lime and PAM solution in a wet granulation mode; the carrier has large specific surface area, strong biological affinity, high porosity and easy attachment of microorganisms. In the operation process, the sulfur and the sulfide in the pyrite are subjected to denitrification denitrogenation, and iron ions in the pyrite not only strengthen the sulfur autotrophic denitrification effect, but also have efficient phosphorus removal effect. The utility model discloses simple and convenient, the stability is high, can supply biological carrier fast, reaches 85 ~ 90% to landfill leachate denitrification efficiency, and dephosphorization efficiency reaches 60 ~ 70%.

Description

Sewage treatment plant based on autotrophic nitrogen and phosphorus removal biological carrier

Technical Field

The utility model belongs to the technical field of sewage biological treatment, concretely relates to sewage treatment plant based on autotrophic nitrogen and phosphorus removal biological carrier.

Background

The leachate of the municipal refuse landfill has complex components, and at present, no perfect process suitable for treating the leachate exists, and the leachate is one of the most difficult wastewater to treat, and is mainly represented by high BOD and COD concentrations, high contents of heavy metals, ammonia nitrogen and total phosphorus and the like. Leachate is a secondary pollution source in the landfill process, high-concentration ammonia nitrogen can generate serious toxic action on water, organisms, soil and the like, and serious environmental pollution can be caused if the leachate is directly discharged into the environment without treatment. Therefore, the landfill leachate needs to be treated by a series of nitrogen and phosphorus removal processes to reduce the environmental toxicity.

The traditional heterotrophic nitrification-denitrification, short-cut nitrification-denitrification and novel anaerobic ammonia oxidation processes have the bottleneck problems of incomplete denitrification and high nitrate nitrogen content in effluent in the denitrification treatment of the landfill leachate. If the heterogeneous denitrification process is continuously adopted for deep denitrification, a large amount of organic carbon sources need to be supplemented, so that the operation cost is increased, and secondary pollution caused by carbon source supplement is easily caused. The sulfur autotrophic denitrification is a novel sewage deep denitrification process, does not need to additionally add a carbon source, has less carbon emission and low operation cost, and is the current international foremost denitrification treatment process. But the process has the problems of high alkalinity consumption, low processing load, low electron transfer efficiency, low denitrification efficiency and the like in the actual operation process; meanwhile, the research and development of sulfur autotrophic denitrification biomass carrier materials also have short plates, most of the sulfur autotrophic denitrification biomass carrier materials are blocky or blocky pure sulfur carrier materials used in the current market, and the problems of mutual blockage and entanglement, poor microbial adhesion, difficulty in stabilizing and film hanging, low treatment efficiency, incapability of synchronously removing phosphorus and the like exist; therefore, a novel autotrophic nitrogen and phosphorus removal biological carrier material needs to be developed and applied to deep nitrogen and phosphorus removal treatment of landfill leachate.

Disclosure of Invention

In order to overcome the defects of the prior art, the utility model aims to provide a sewage treatment device based on an autotrophic nitrogen and phosphorus removal biological carrier, which can efficiently remove nitrogen and phosphorus.

In order to achieve the purpose, the utility model provides a sewage treatment device based on autotrophic nitrogen and phosphorus removal biological carriers, which is characterized by comprising a water inlet device and a reactor main body, wherein the reactor main body is provided with an overflow trough (7), a packing layer (5) and a bearing plate (4) from top to bottom in sequence;

the water inlet device comprises a water inlet pipe (1), a water inlet pump (2) and water distribution pipes (3), wherein the water inlet pump (2) is arranged on the water inlet pipe (1), the water inlet pipe (1) is inserted into the bottom of the reactor main body and is communicated with the water distribution pipes (3), and the water inlet pipe (1) and the water distribution pipes (3) are arranged below the supporting plate (4);

the filler layer (5) is uniformly filled with the composite sulfur-pyrite ore pellet biological carrier micro-particles (6).

Preferably, the distributive pipe (3) is provided with a plurality of groups which are symmetrically arranged on two sides of the water inlet pipe (1), and each distributive pipe (3) is perpendicular to the water inlet pipe (1) and communicated with the water inlet pipe (1).

Preferably, the bearing plate (4) is of a hollow structure, holes are formed in the bearing plate (4), the water distribution pipe (3) is provided with a plurality of upward water outlets, and the upward water outlets are in butt joint with the holes of the bearing plate (4).

Preferably, the packing layers (5) are provided with a plurality of groups, and each group of packing layers (5) is arranged in the reactor main body in an up-down overlapping mode.

Preferably, the filling volume of the composite sulfur-pyrite sphere biological carrier micro-particles (6) is 70-90% of the volume of the filler layer.

Preferably, the composite sulfur-pyrite sphere biological carrier microparticle (6) is of a spherical structure.

Preferably, the particle size of the composite sulfur-pyrite globule biological carrier microparticle (6) is 8-12 mm.

Preferably, the composite sulfur-pyrite sphere biological carrier microparticle (6) is prepared by a wet granulation method, and the preparation method comprises the following steps: firstly, crushing and mixing sulfur, pyrite and hydrated lime to prepare powder, then adding a PAM solution to prepare a paste, stirring and granulating the powder and the paste to form a carrier base core, and finally continuously adding the powder and stirring to prepare the biological carrier.

The utility model also provides a sewage treatment method based on autotrophic nitrogen and phosphorus removal biological carrier, adopt above-mentioned sewage treatment plant based on autotrophic nitrogen and phosphorus removal biological carrier to carry out degree of depth nitrogen and phosphorus removal to landfill leachate, intake sewage through the inlet tube and the distributive pipe of bottom, handle through the packing layer and flow through the overflow launder again after.

Preferably, the process operating conditions of the deep nitrogen and phosphorus removal are as follows: the inlet water is the sewage treated by the front-end short-cut nitrification-denitrification-anaerobic ammonia oxidation process, the total nitrogen concentration of the inlet water is 150 +/-10 mg/L, and the total phosphorus concentration of the inlet water is 5 +/-1 mg/L.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model provides a sewage treatment device based on autotrophic nitrogen and phosphorus removal biological carriers, which comprises a water inlet device, a packing layer and an overflow trough; the device adopts the upflow type treatment, sewage enters from a bottom water pipe, and flows out through an overflow trough after being treated by a packing layer. An autotrophic nitrogen and phosphorus removal biological carrier is filled in the packing layer, and the carrier is prepared by mixing sulfur, pyrite, hydrated lime and a PAM solution in a wet granulation mode; the carrier has large specific surface area, strong biological affinity, high porosity and easy attachment of microorganisms. In the operation process, the sulfur and the sulfide in the pyrite are subjected to denitrification denitrogenation, and iron ions in the pyrite not only strengthen the sulfur autotrophic denitrification effect, but also have efficient phosphorus removal effect; the hydrated lime powder is used as an internal framework to enhance the mechanical strength, and provides alkalinity in the carrier consumption process to maintain the pH stability of a reaction system; PAM can fully bond sulfur powder, pyrite powder and slaked lime powder, so that the biological carrier has enough mechanical strength, the carrier material has biological affinity, and the PAM can be fully hydrolyzed after the powder is completely consumed, thereby avoiding pipeline blockage. The utility model discloses simple and convenient, the stability is high, can supply biological carrier fast, reaches 85 ~ 90% to landfill leachate denitrification efficiency, and dephosphorization efficiency reaches 60 ~ 70%.

Drawings

FIG. 1 is a structural diagram of a sewage treatment plant based on autotrophic nitrogen and phosphorus removal biological carriers;

FIG. 2 is a diagram of a composite sulfur-pyrite sphere bio-carrier microparticle;

FIG. 3 is a diagram showing the denitrification effect of the sewage treatment apparatus;

FIG. 4 is a diagram illustrating the phosphorus removal effect of the sewage treatment apparatus;

in the figure 1, 1-a water inlet pipe, 2-a water inlet pump, 3-a water diversion pipe, 4-a supporting plate, 5-a filler layer, 6-composite sulfur-pyrite sphere biological carrier microparticles and 7-an overflow trough.

Detailed Description

The following further describes the embodiments of the present invention. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features related to the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

The experimental procedures in the following examples were carried out by conventional methods unless otherwise specified, and the test materials used in the following examples were commercially available by conventional methods unless otherwise specified.

Example 1 Sewage treatment plant based on autotrophic nitrogen and phosphorus removal biological carrier

As shown in fig. 1, the sewage treatment device based on autotrophic nitrogen and phosphorus removal biological carrier comprises a water inlet device and a reactor main body, wherein the reactor main body is sequentially provided with an overflow trough 7, a packing layer 5 and a supporting plate 4 from top to bottom;

the water inlet system comprises a water inlet pipe 1, a water inlet pump 2 and a water distribution pipe 3, wherein the water inlet pump 2 is arranged on the water inlet pipe 1, and the water inlet pipe 1 is inserted into the bottom of the side of the reactor body and is communicated with the water distribution pipe 3; the water distribution pipes 3 are symmetrically arranged on two sides of the water inlet pipe 1 and communicated with the water inlet pipe 1, each water distribution pipe 3 is perpendicular to the water inlet pipe and horizontally arranged below the bearing plate 4, and the water distribution pipes 3 are provided with a plurality of upward water outlets uniformly spaced;

the water distribution pipe 3 enables the sewage to be distributed and discharged in a manner of uniform and full coverage through a multi-channel pipeline, the water discharge is more uniform, and the integral nitrogen and phosphorus removal effect is favorably improved.

The bearing plate 4 is in a hollow design, is provided with a plurality of holes at even intervals, is arranged above the water distribution pipe and is used for bearing the packing layer 5, and the holes of the bearing plate 4 are all butted with the water outlets of the water distribution pipe 3; the packing layers 5 are provided with four groups and are arranged in the reactor main body in an up-and-down overlapping mode; the filler layer 5 is uniformly filled with composite sulfur-pyrite globule biological carrier microparticles 6 (a real object is shown in figure 2) with a spherical structure, the filling volume is 80% of the volume of the filler layer, the composite sulfur-pyrite globule biological carrier microparticles 6 are prepared by mixing sulfur, pyrite, hydrated lime and PAM solution in a wet granulation mode, and the composite sulfur-pyrite globule biological carrier microparticles 6 are microparticles with the particle size of 8-12mm, and the porosity of the composite sulfur-pyrite globule biological carrier microparticles is 50%.

The preparation steps of the composite sulfur-pyrite sphere biological carrier micro-particles 6 are as follows:

(1) Putting the sulfur and pyrite solid into a high-speed crusher (XY-4500 b) to be crushed and pass through a 100-mesh sieve, mixing the sieved mixed powder with slaked lime powder, and uniformly stirring to prepare powder, wherein the mass ratio of the sulfur to pyrite to the slaked lime is 1: 3: 0.2;

(2) Slowly adding a PAM aqueous solution (cationic type 40-ion degree) with the concentration of 0.2% into the powder in the step (1), wherein the mass of the solution is 1/3 of that of the powder, and uniformly stirring to obtain a paste with the water content of 25% (w/w);

(3) Uniformly feeding the powder obtained in the step (1) into a round pot granulator (with the diameter of 80 cm), then adding the paste obtained in the step (2) into the round pot granulator, wherein the mass ratio of the powder to the paste is 1; and (2) continuously adding the powder in the step (1) into the pot until the mass ratio of the powder to the paste is 2.

When the sewage treatment device is used for denitrification and dephosphorization, sewage enters the water inlet pipe and the water distribution pipe at the bottom, is treated by the packing layer and then flows out through the overflow launder; the sulfur and the pyrite are used as main materials of a biological carrier, wherein the sulfur (reduced sulfur simple substance) provides an electron donor for a denitrification reaction process to carry out deep denitrification; sulfides in the pyrite can be used as a denitrification electron donor, iron ions can be used as an external electron medium to strengthen sulfur autotrophic denitrification, and the iron ions also have a high-efficiency phosphorus removal effect; providing alkalinity by the hydrated lime powder in the process of slowly consuming the carrier, and maintaining the pH stability of a reaction system; PAM makes the carrier material have biological affinity, can fully hydrolyze after sulphur, pyrite and slaked lime consume completely in the carrier and can not cause the pipeline to block up, after the carrier material is consumed in the operation process, supply the carrier material to original filling height and can resume denitrogenation effect, additional operations such as need not mixing.

Example 2 application effect of the Sewage treatment plant based on autotrophic nitrogen and phosphorus removal biological carrier

The sewage treatment device based on the autotrophic nitrogen and phosphorus removal biological carrier in the embodiment 1 is applied to the deep nitrogen and phosphorus removal treatment of landfill leachate, and the process conditions are as follows: inoculating sludge of the sewage treatment device is taken from a denitrification sludge pool, and the sludge concentration MLSS is 6.6g/L; the water inlet mode is continuous water inlet, the water inlet is sewage treated by the front-end short-cut nitrification-denitrification-anaerobic ammonia oxidation process, the total nitrogen TN concentration of the water inlet is 150mg/L, the total phosphorus TP concentration of the water inlet is 5mg/L, and the treatment capacity is 3m ³ /day。

The denitrification effect is shown in figure 3, after the sewage treatment device operates stably, the total nitrogen removal rate reaches 85-90%, the effluent TN is lower than 10mg/L, and the effluent PH can be stably maintained at 8.5 +/-0.2.

The phosphorus removal effect is shown in figure 4, after the sewage treatment device stably operates, the TP of the effluent is lower than 2mg/L, and the total phosphorus removal rate reaches 60-70%.

The embodiments of the present invention have been described in detail, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the principles and spirit of the invention, and these embodiments are still within the scope of the invention.

Claims

1. A sewage treatment device based on autotrophic nitrogen and phosphorus removal biological carriers is characterized by comprising a water inlet device and a reactor main body, wherein the reactor main body is sequentially provided with an overflow trough (7), a packing layer (5) and a bearing plate (4) from top to bottom;

the water inlet device comprises a water inlet pipe (1), a water inlet pump (2) and a water distribution pipe (3), wherein the water inlet pump (2) is arranged on the water inlet pipe (1), the water inlet pipe (1) is inserted into the bottom of the reactor main body and is communicated with the water distribution pipe (3), and the water inlet pipe (1) and the water distribution pipe (3) are both arranged below the supporting plate (4);

2. The sewage treatment device based on the autotrophic nitrogen and phosphorus removal biological carrier according to claim 1, wherein the plurality of groups of the water diversion pipes (3) are symmetrically arranged on two sides of the water inlet pipe (1), and each water diversion pipe (3) is perpendicular to the water inlet pipe (1) and is communicated with the water inlet pipe (1).

3. The sewage treatment device based on the autotrophic nitrogen and phosphorus removal biological carrier according to claim 1, wherein the supporting plate (4) is a hollow structure, holes are formed in the supporting plate (4), the water distribution pipe (3) is provided with a plurality of upward water outlets, and the water outlets are in butt joint with the holes of the supporting plate (4).

4. The sewage treatment device based on the autotrophic nitrogen and phosphorus removal biological carrier according to claim 1, wherein the packing layers (5) are provided with a plurality of groups, and each group of packing layers (5) is arranged inside the reactor main body in an up-and-down superposition manner.

5. The sewage treatment device based on the autotrophic nitrogen and phosphorus removal biological carrier according to claim 1, wherein the filling volume of the composite sulfur-pyrite sphere biological carrier micro-particles (6) is 70-90% of the volume of the filler layer.

6. The sewage treatment plant based on the autotrophic nitrogen and phosphorus removal biological carrier according to claim 1, wherein the composite sulfur-pyrite sphere biological carrier micro-particles (6) are spherical structures.

7. The sewage treatment device based on the autotrophic nitrogen and phosphorus removal biological carrier according to claim 6, wherein the particle size of the composite sulfur-pyrite sphere biological carrier micro-particles (6) is 8-12 mm.