What are the methods of using sludge treatment equipment

The treatment method of the sludge treatment equipment, first, the original sludge is pumped from the secondary settling tank to another tank through the sludge pump and then separated from the supernatant. Since the moisture content of the original sludge can generally reach 99.5%, it is necessary to thicken the sludge. There are many feasible ways to reduce the volume of the sludge.

　　 Mechanical treatment methods such as vacuum filtration and centrifugation are generally used before the sludge is disposed of in a semi-solid manner. Generally these methods are preparations for sludge combustion treatment. If biological treatment is planned, gravity sedimentation or air flotation is mostly used for concentration. The sludge corresponding to these two cases is still fluid.

　　 The design and operation of the gravity thickening tank are similar to the secondary settling tank in sewage treatment. The concentration function is the main design parameter. In order to satisfy the greater concentration capacity, the concentration tank is basically deeper than the secondary settling tank. A properly designed and well-functioning gravity thickener can increase the sludge content by at least twice. In other words, the moisture content of sludge can be reduced from 99.5% to 98% or less. It is worth mentioning here that the design of the gravity thickening tank should be based on the analysis of Chinese results as much as possible, because the appropriate sludge loading rate is closely related to the properties of the sludge.

　　 If dissolved air flotation is used for concentration, a small amount of water is required, usually from the secondary sedimentation tank, and aerated at a pressure of 400kPa. This supersaturated liquid passes into the bottom of the tank, while the sludge passes under atmospheric pressure. The gas adheres to the solid particles in the sludge in the form of small bubbles, or is enclosed, and then drives the solid particles to float to the surface. The upper part of the concentrated sludge is removed, and the liquid flows from the bottom back to the gas tank for aeration.

If you are interested in GN products, please check the following items on Alibaba:

Decanter centrifuge

3-Phase Disc centrifuge

Sludge dewatering Screw press

Oil water separator

Centrifugal pump

Vacuum Pump

Submersible pump

The structure introduction of the decanter centrifuge

　　 Decanter centrifuge is a model with low energy consumption, stable function and good separation effect. Widely used in the chemical, food, salt, mining, pharmaceutical and other industries (for the separation of dozens of materials, because of the successful application experience, you can communicate with technicians when selecting models to obtain more detailed materials). In the separation process, the feeding, dewatering, washing, unloading and other processes are continuously completed, and the production efficiency and automation are high. It is an advanced separation equipment.

　　Because of its separation principle and structural characteristics, it is also highly specific to materials. Material analysis and corresponding experiments should be carried out when selecting models to confirm its applicability and separation function.

　　 The solid particles with a larger specific gravity are deposited on the inner wall of the rotating drum in the decanter centrifuge. The screw sedimentation centrifuge is a kind of mud-water mixture that enters the rotating drum through the feed pipe and the screw discharge port. Under the action of centrifugal force generated by the high-speed rotation of the host. The spiral blades moving relative to the drum continuously scrape the solid particles deposited on the inner wall of the drum and push them out of the slag discharge port, and the separated clear liquid flows out of the drum machine through the weir plate opening.

　　 The working principle of the decanter centrifuge is that the mud-water mixture enters the drum through the feed pipe and the screw discharge port. Under the action of the centrifugal force generated by the high-speed rotation of the host, solid particles with a larger specific gravity are deposited on the inner wall of the drum.

The spiral blades of the decanter centrifuge and the rotating drum move relative to each other to continuously scrape the solid particles deposited on the inner wall of the rotating drum and push them out of the slag discharge port. The separated clear liquid flows out of the drum through the opening of the weir plate. The relative movement between the screw and the drum is completed by the differential, the shell of the differential is connected with the drum, the output shaft is connected with the screw, and the input shaft is connected with the auxiliary motor. When the main motor rotates the drum, it also rotates the differential housing. Because the input shaft is connected to the auxiliary motor, the auxiliary motor generates a braking torque, and then drives the planetary gear to work according to the designed transmission connection, and press A certain proportion of contact transfers the torque to the screw, which completes the continuous separation of materials by the decanter centrifuge.

By the way, please check the following products of GN company on Alibaba:

Decanter centrifuge

3-Phase Disc centrifuge

Sludge dewatering Screw press

Oil water separator

Centrifugal pump

Vacuum Pump

Submersible pump

How to correctly operate the decanter centrifuge

The decanter centrifuge can carry out centrifugal sedimentation of two or three liquid-solid heterogeneous materials with different densities. Usually during the operation of the decanter centrifuge, the main motor drives the two pulleys together to roll, separates the drive drum and the spiral via a gear or a cycloid differential, and maintains a fixed relative differential speed between the two. The equipment is separated at high speed.

　　 In order to ensure the ideal separation effect, it is necessary to ensure the balance of the decanter centrifuge itself. The centrifuge tubes and their contents should be accurately balanced. In fact, the ultracentrifuge rotor is mounted on a very thin shaft, so when the two centrifuge tubes are balanced, the difference in components must not exceed the scale specified in the instructions of various centrifuges.

　　The difference between the two centrifuge tubes of the preparative ultracentrifuge shall not exceed 0.1g. Centrifuge tubes with sleeves should be balanced with sleeves. Centrifuge tube sleeves must not be mixed between different centrifuges. After reaching the equilibrium condition, when adding materials, the balance should also be maintained, so as to avoid asymmetrical centrifugal force damage to the centrifugal shaft and cause serious accidents. After the balanced centrifuge tube is placed symmetrically, cover the decanter centrifuge cover, turn on the power supply, and set the centrifuge speed and centrifuge speed.

　　 When the separation set time is about to arrive, the deceleration or speed adjustment knob should be turned on in time to decelerate. After the decanter centrifuge naturally stops rolling, open the cover and take out the centrifuge tube. Turn off the power and unplug the power plug. Clean the centrifuge, centrifuge chamber, centrifuge tube, sleeve, etc.

The decanter centrifuge itself is also equipped with an automatic control operating system. After setting the centrifugal speed, centrifugal time, temperature, vacuum and other parameters, turn on the switch and the equipment will automatically operate. After reaching the relevant parameters, record the time. After reaching the set time, the decanter centrifuge will automatically stop and the deceleration device will automatically turn on.

By the way, please check the following products of GN company on Alibaba:

Decanter centrifuge

3-Phase Disc centrifuge

Sludge dewatering Screw press

Oil water separator

Centrifugal pump

Vacuum Pump

Submersible pump

What principles should be followed when using decanter centrifuge?

When using decanter centrifuge, attention should be paid to the details. Once the fixed sequence is not followed, it is difficult to complete the cleaning quickly. When filtering and cleaning, it is necessary to understand the solid content of the filter.

In general, when the solid content in the liquid is higher, the cleaning time that people need to spend, especially for those liquids with certain viscous properties, should be carried out in strict accordance with the instructions. Do not ignore any process because of blindness or irritability, otherwise it will form an irreparable effect and increase sludge The cost of treatment is small and the big is lost.

Therefore, we should follow the following guidelines when using decanter centrifuge:

1. For the wastewater containing highly toxic substances, such as heavy metals, radioactive substances and high concentrations of phenol and cyanogen, the sewage should be separated from other types of sewage to facilitate the treatment and recovery of useful substances.

2. In the production process of using toxic raw materials and toxic intermediate products, reasonable process flow and equipment should be selected. When using sewage dehydrator, strict operation and supervision should be implemented.

3. The fundamental solution of sewage treatment is to change the traditional production process and reduce the toxic and harmful sewage in the production process as much as possible. Can use non-toxic materials or corresponding products to replace toxic materials or products.

Due to the low moisture content of sludge, stable operation, low energy consumption, simple operation and management, and convenient maintenance, the decanter centrifuge is favored by the majority of users. Next, let's take a look at the features of the decanter centrifuge.

1. The mechanical performance of the decanter centrifuge is stable and reliable. It can complete 24-hour continuous production operation, with large treatment capacity and high output.

2. The new type of double flow flocculation has good dewatering effect, low moisture content of filter cake, convenient and economical follow-up treatment.

3. The structure design is advanced and reasonable. The ultra long gravity filtration dehydration section adopts the vertical strong pressure roller, which has a wide range of application.

4. The filtrate is clean, easy to reuse and reduce secondary pollution.

5. Low flocculation liquid and kinetic energy consumption.

6. The whole machine has good corrosion resistance, convenient operation, easy maintenance and repair.

7. Full automatic operation and control, excellent quality and service life of spare parts.

Please check the following products of GN company on Alibaba:

Decanter centrifuge

3-Phase Disc centrifuge

Sludge dewatering Screw press

Oil water separator

Centrifugal pump

Vacuum Pump

Submersible pump