Novel sludge treatment system

Abstract

The utility model discloses a novel sludge treatment system, which comprises a reaction tank, an ultrasonic generator, a sludge tank, a gas source, a separation tank and a storage tank, the sludge tank is connected with a sludge sample inlet of the reaction tank through a pipeline, the ultrasonic generator is mounted on the reaction tank, and a gas inlet of the reaction tank is connected with the gas source through a gas inlet pipeline. A gas recovery port of the reaction tank is connected with a separation tank, the top of the separation tank is communicated with a nitrogen source through a recovery pipeline, the bottom of the separation tank is connected with an inlet of a storage tank through a pipeline, an outlet of the storage tank is communicated with a sludge tank through a pipeline, and a sludge outlet is formed in the bottom end of the reaction tank; the probe type ultrasonic sludge treatment device in the system realizes continuous sludge treatment, and a mechanical stirrer is arranged in the sludge tank, so that the sludge is finely granulated; nitrogen is introduced into the reaction tank to stir the sludge, so that the phenomenon of non-uniform sludge treatment caused by small radiation area of probe type ultrasonic waves is reduced; and meanwhile, nitrogen can be used as a cavitation nucleus to strengthen the cavitation effect of ultrasonic waves.

Description

TECHNICAL FIELD

[0001] The utility model relates to a sludge treatment technical field, specifically relates to a novel sludge treatment system. BACKGROUND

[0002] Sludge is a byproduct of sewage treatment, and the sludge production in China has exceeded 6000 tons in 2020 (calculated on the basis of 80% moisture content). It is mainly composed of polysaccharides, proteins, lipids, nucleic acids, humic acid and other extracellular polymers. At the same time, it also contains a large amount of N, P, Ca and other elements, as well as heavy metals, polychlorinated biphenyls and other toxic organic matter and pathogenic microorganisms. Therefore, sludge has the dual nature of "pollution" and "resource". The relevant scheme has been proposed to steadily promote the resource utilization under the premise of realizing the stabilization and harmless disposal of sludge. Anaerobic digestion of sludge can realize stabilization and harmless, and at the same time produce biogas to realize the resource utilization of sludge. However, a large amount of hydrolysis-resistant extracellular polymeric substance (EPS) (50%-80%) contained in sludge, cell wall and selective permeable cell membrane hinder the anaerobic digestion process of sludge. Therefore, the sludge needs to be pretreated before anaerobic digestion.

[0003] Ultrasonic wave is a kind of sound wave with frequency > 20 kHz. The sludge can be broken by using ultrasonic wave pretreatment, and its main mechanism is cavitation: when ultrasonic wave propagates in sludge medium, compression and stretching action will be generated, and positive pressure and negative pressure will be caused, and dense and sparse areas will be formed in sludge, and micro bubbles (cavitation bubbles) will be generated in sparse areas due to excessive negative pressure, which will gradually grow to break, and the shock wave generated at the time of breaking and the environmental conditions (high hydrodynamic shear, high temperature and pressure and free radicals) will promote the breaking of sludge. The above process is a physical action, so it will not cause secondary pollution and does not need to introduce chemical reagents, and at the same time, the toxic and refractory compounds contained in sludge can be degraded into simpler molecular structure. Common ultrasonic wave reactors include tank type acoustic chemical reactor and probe type ultrasonic wave chemical reactor, among which the latter is also called variable amplitude rod immersed acoustic chemical reactor, which is mainly composed of ultrasonic wave generator, transducer, variable amplitude rod and ultrasonic wave probe. Its main features are small emission area, strong ultrasonic wave, small probe and easy disassembly, and it can directly act on the medium, so it has been widely used.

[0004] However, the small emission area of ultrasonic wave is easy to cause uneven ultrasonic wave radiation and limited cavitation area, and with the extension of treatment time, the sludge is easy to agglomerate around the probe, which affects the subsequent decontamination effect. UTILITY MODEL CONTENT

[0005] In view of the deficiencies of the prior art, the utility model provides a novel sludge treatment system, nitrogen is led into the inside of the reaction tank in the system, and the gas disturbance realizes the stirring effect on the sludge, reduces the uneven phenomenon of sludge treatment, and also reduces the phenomenon that sticky agglomerates appear near the probe with treatment; nitrogen can be used as a cavitation nucleus, and the cavitation effect of ultrasonic waves is strengthened.

[0006] In order to realize the above-mentioned purpose, the utility model adopts the following technical scheme:

[0007] A novel sludge treatment system, including reaction tank, ultrasonic wave generating device, sludge tank, gas source, separation tank and storage tank, the sludge tank is connected sludge sample inlet of reaction tank through pipeline, and the ultrasonic wave generating device is installed on the reaction tank, and the gas inlet of reaction tank is connected gas source through gas inlet pipeline, and the gas recovery port of reaction tank is connected separation tank, and the top of separation tank is connected the gas source of nitrogen through recovery pipeline, and the bottom of separation tank is connected the inlet of storage tank through pipeline, and the outlet of storage tank is connected sludge tank through pipeline, the bottom end of reaction tank is provided with sludge discharge port;

[0008] As the preferred technical scheme of the utility model, the ultrasonic wave generating device includes the ultrasonic wave probe and the ultrasonic wave generator that are connected with each other, the ultrasonic wave probe is located in the inside of the reaction tank, and the ultrusive wave generator is located outside the reaction tank;

[0009] As the preferred technical scheme of the utility model, the reaction tank is provided with a constant temperature layer outside, a circulating water inlet is arranged at the lower part of the constant temperature layer, and a circulating water outlet is arranged close to the top of the constant temperature layer;

[0010] As the preferred technical scheme of the utility model, the lower end of the reaction tank is conical, the sludge sample inlet is located at the middle part of the reaction tank, the gas inlet is located on the conical slope, and the gas recovery port is located at the top end of the reaction tank;

[0011] As the preferred technical scheme of the utility model, the sludge tank is provided with a stirrer inside;

[0012] As the preferred technical scheme of the utility model, the pipeline connected with the sludge discharge port is divided into two branches, branch one is connected to the sludge tank through the pipeline, and a centrifugal pump is installed on the pipeline of branch one; Branch two is connected to the next processing unit;

[0013] As the preferred technical scheme of the utility model, a centrifugal pump is installed on the pipeline between the sludge tank and the sludge sample inlet of the reaction tank;

[0014] As the preferred technical scheme of the utility model, the ultrasonic wave probe and the reaction tank are coaxially arranged.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] 1. This sludge treatment system installs an ultrasonic generator in the sludge tank, which is connected to the reaction tank. The sludge treated in the reaction tank is piped into the storage tank and then returned to the sludge tank, achieving continuous sludge treatment. A mechanical agitator is installed inside the sludge tank to agitate and refine the sludge, making the sludge entering the reaction tank fine particles, which is beneficial for subsequent ultrasonic treatment and improves the sludge treatment efficiency.

[0017] 2. Nitrogen gas is introduced into the reaction tank. The gas agitation agitates the sludge, reducing uneven sludge treatment caused by the small radiation area of ​​the probe-type ultrasonic waves, and also reducing the formation of sticky agglomerates near the probe during treatment. At the same time, nitrogen gas can act as a cavitation nucleus, enhancing the cavitation effect of the ultrasonic waves. The used nitrogen gas is treated in a separation tank and then returned to the nitrogen gas source for reuse. Using nitrogen gas to treat sludge enhances the system's treatment effect, improves gas utilization, and saves costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the system structure;

[0019] In the diagram: 1. Reaction vessel; 2. Ultrasonic generator; 3. Constant temperature layer; 4. Sludge tank; 5. Gas source; 6. Separation tank; 7. Storage tank; 101. Sludge inlet; 102. Air inlet; 103. Gas recovery port; 104. Sludge outlet; 201. Ultrasonic probe; 202. Ultrasonic generator; 301. Circulating water inlet; 302. Circulating water outlet; 501. Air inlet pipeline; 502. Pipeline. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

[0021] Figure 1 As shown, a novel sludge treatment system is provided, including a reaction tank 1, an ultrasonic generator 2, a sludge tank 4, a gas source 5, a separation tank 6, and a storage tank 7. The sludge tank 4 is connected to the sludge inlet 101 of the reaction tank 1 via a pipeline. The ultrasonic generator 2 is installed on the reaction tank 1. The gas inlet 102 of the reaction tank 1 is connected to the gas source 5 via an gas inlet pipeline 501. The gas recovery port 103 of the reaction tank 1 is connected to the separation tank 6. The top of the separation tank 6 is connected to the nitrogen gas source 5 via a recovery pipeline 502. The bottom of the separation tank 6 is connected to the inlet of the storage tank 7 via a pipeline. The outlet of the storage tank 7 is connected to the sludge tank 4 via a pipeline. A sludge discharge outlet 104 is provided at the bottom of the reaction tank 1.

[0022] Reaction tank 1 provides space for sludge treatment.

[0023] The reaction tank 1 is connected with the ultrasonic wave generating device 2, the top end of which is provided with mounting ports of the ultrasonic wave probe 201 and the ultrasonic wave generator 202; the ultrasonic wave probe 201 and the ultrasonic wave generator 202 provide the required ultrasonic wave when treating the sludge. The ultrasonic wave probe 201 is arranged inside the reaction tank 1, and the other end is connected with the ultrasonic wave generator 202 arranged outside the reaction tank 1. The ultrasonic wave probe 201 is coaxially arranged with the reaction tank 1.

[0024] The constant temperature layer 3 is arranged outside the reaction tank 1, which can provide the required temperature for the inside of the reaction tank 1 and ensure the constant temperature inside the reaction tank. The circulating water inlet 301 is arranged at the lower part of the constant temperature layer, and the circulating water outlet 302 is arranged close to the top.

[0025] The sludge sample inlet 101 is arranged at the middle part of the reaction tank. The lower end is conical, and the conical slope is provided with the gas inlet 102 connected with nitrogen. The top end is provided with the gas recovery port 103. The conical bottom end is provided with the sludge discharge port 104.

[0026] The sludge sample inlet 101 is connected with the sludge tank 4. The mechanical stirrer is arranged in the sludge tank 4, which includes a motor, a stirring shaft and stirring blades. The motor is fixedly installed at the top of the sludge tank 4 and is connected with the power supply through wires. The output end of the motor is installed with the stirring shaft which extends into the inside of the sludge tank 4. The stirring blades on the stirring shaft rotate under the driving of the motor to realize the stirring of the inside of the sludge tank 4.

[0027] The stirring of the sludge to be treated can avoid the deposition of the sludge and promote the fine granulation of the sludge, thereby being beneficial to the subsequent ultrasonic wave treatment process.

[0028] The gas inlet 102 is connected with the gas inlet pipeline 501, and the gas inlet pipeline 501 is connected with the nitrogen gas source 5. The gas source 5 provides the appropriate amount of gas for the reaction tank and plays a role of stirring and cavitation nucleus in the process of treating the sludge by ultrasonic wave.

[0029] The gas recovery port 103 is connected with the separation tank 6, which can recover and separate the nitrogen in the reaction tank 1. The separated nitrogen enters the nitrogen gas source 5 through the recovery pipeline 502 to be used again. In the separation tank 6, the liquid or solid carried by the nitrogen enters the storage tank 7 and is returned to the sludge tank 4 to be treated again.

[0030] The treated sludge is discharged from the reaction tank 1 through the sludge discharge port 104 and is subjected to the next step of treatment to enter the anaerobic or homogeneous tank.

[0031] The solid content of the sludge is 0.5%-8.0%, preferably 3.0%-6.0%.

[0032] In use:

[0033] The sludge with a certain solid content is placed in the sludge tank 4, and under the action of the mechanical stirrer, a uniformly dispersed sludge-water sample is formed, and under the action of the centrifugal pump, the sludge-water sample enters the reaction tank 1 through the middle sludge inlet 101 of the reaction tank 1. Nitrogen gas enters the inside of the reaction tank from the bottom gas inlet 102 of the reaction tank 1 through the gas inlet pipeline 501 from the gas source 5. Under the action of the ultrasonic generator 202, the energy is radiated by the ultrasonic probe 201, and after the sludge to be treated absorbs the energy, the release of the organic matter in the sludge is realized. At the same time, nitrogen gas is introduced into the inside of the reactor, so that the sludge near the probe is timely renewed. After a certain treatment time, the sludge is discharged from the sludge discharge port 104 of the reaction tank, a part of which is returned to the sludge tank 4 for ultrasonic treatment again, and the other part is introduced into the next treatment process. The nitrogen gas enters the separation tank 6 from the gas recovery port 103 at the top end of the reaction tank 1, is separated from a small amount of liquid or solid, and then reenters the gas source 5 through the recovery pipeline 502. The residual liquid or solid enters the storage tank 7 from the separation tank 6, and then reenters the sludge tank 4 through the sample recovery pipeline.

[0034] The utility model discloses the technical concept of the utility model through the above embodiment, but the utility model does not limit to the above embodiment, namely does not mean that the utility model must rely on the above embodiment to be able to implement. The skilled in the art should understand that the relevant improvement of the utility model falls in the protection scope and the public scope of the utility model.

Claims

1. A novel sludge treatment system comprising a reaction tank (1), an ultrasonic wave generating device (2), a sludge tank (4), a gas source (5), a separation tank (6) and a storage tank (7), characterized in that, The sludge tank (4) is connected with the sludge inlet (101) of the reaction tank (1) through a pipeline, the ultrasonic generating device (2) is installed on the reaction tank (1), the gas inlet (102) of the reaction tank (1) is connected with the gas source (5) through a gas inlet pipeline (501), the gas recovery port (103) of the reaction tank (1) is connected with the separation tank (6), the top of the separation tank (6) is communicated with the nitrogen gas source (5) through a recovery pipeline (502), the bottom of the separation tank (6) is connected with the inlet of the storage tank (7) through a pipeline, the outlet of the storage tank (7) is communicated with the sludge tank (4) through a pipeline, and the bottom end of the reaction tank (1) is provided with a sludge discharge port (104).

2. The novel sludge treatment system as claimed in claim 1, wherein, The ultrasonic generating device (2) comprises an ultrasonic probe (201) and an ultrasonic generator (202) connected with each other, the ultrasonic probe (201) is located in the inside of the reaction tank (1), and the ultrasonic generator (202) is located outside the reaction tank (1).

3. The novel sludge treatment system as claimed in claim 1, wherein, The reaction tank (1) is provided with a constant temperature layer (3) outside, a circulating water inlet (301) is arranged at the lower part of the constant temperature layer (3), and a circulating water outlet (302) is arranged close to the top of the constant temperature layer (3).

4. The novel sludge treatment system as claimed in claim 1, wherein, The lower end of the reaction tank (1) is conical, the sludge inlet (101) is located in the middle part of the reaction tank (1), the gas inlet (102) is located on the conical slope, and the gas recovery port (103) is located at the top end of the reaction tank (1).

5. The novel sludge treatment system as claimed in claim 1, wherein, The sludge tank (4) is internally provided with a stirrer.

6. The novel sludge treatment system as claimed in claim 1, wherein, The pipeline connected with the sludge discharge port (104) is divided into two branches, one branch is connected with the sludge tank (4) through a pipeline, and a centrifugal pump is arranged on the pipeline of the branch; the other branch is connected with a next processing unit.

7. The novel sludge treatment system as claimed in claim 1, wherein, A centrifugal pump is arranged on the pipeline between the sludge tank (4) and the sludge inlet (101) of the reaction tank (1).

8. The novel sludge treatment system as claimed in claim 2, wherein, The ultrasonic probe (201) is coaxially arranged with the reaction tank (1).

Images