What is the process of sludge deep dewaterer?

Sludge dewatering can choose sludge dewatering machine, or solid-liquid separator, collectively referred to as horizontal centrifuge also known as worm centrifuge. With the popularization and application of decanter centrifuge in different fields, the performance requirements of products continue to improve, although the main technical characteristics of the design of each manufacturer are basically the same, but there are great differences in the design concept in technical details, mainly in the selection of technical parameters, the selection of materials, the different manufacturing processes, and the quality is very different. Selection of technical parameters The diameter and ratio of the bowl and the ratio of length to diameter, the number of screw heads and the separation factors are the main technical parameters of the decanter centrifuge.

According to different materials, the length-diameter ratio of the same model will be different, Zhejiang Zhengda environmental protection equipment will choose the applicable model for you, with large production capacity and good separation effect. Zhejiang Zhengda environmental protection equipment **** according to many years....

The deep dewatering of sludge is through the chemical conditioning of sludge products with high water content, and the use of high-pressure pressing to dewater to less than 60% water content, which can not only effectively reduce the volume of sludge, but also in the subsequent disposal of the use is also very extensive.

In the process of sludge deep dewatering, sludge of different properties and quantities need to be disposed of accordingly, with the quenching and tempering system and filter press system as the core, combined with other systems to form a complete and efficient industrial chain.

Regarding the sludge dewatering machine equipment, it is mainly through the external pressure of sludge or other sludge dewatering technology to analyze and separate the water in the quenched and tempered sludge to obtain mud cakes or mud blocks with low moisture content and high degree of solidification. At present, among domestic equipment manufacturers, there are many brands of equipment for sludge dewatering, and the process and quality of equipment manufacturing are further complete.

Sludge depth dewatering machine.

Details: The process of deep dewatering of sludge.

Hydraulic cavitation technology is currently the world's most advanced sludge wall breaking technology, and it is also the basis for sludge disposal reduction, stabilization, harmlessness and resource utilization.

1. What is hydraulic cavitation?

Hydraulic cavitation refers to the state of artificially creating low pressure and high flow velocity somewhere in the pipeline through which the liquid passes, when the liquid pressure is less than the saturated vapor pressure, the bubbles in the liquid will continue to expand and become larger. With the movement of the fluid, after the bubble reaches the area of high pressure and low flow velocity, the bubble will collapse and burst, and when it collapses sharply, it can release huge energy, and produce a microjet with a speed of about 110m s and a strong impact force, and the collision density is as high. The bubbles produce local high temperature and pressure (5000K, 1800ATM) at the moment of rapid collapse, and this extreme physical condition is enough to kill most microorganisms and destroy their cell walls.

An average of 70% of the microbial cells are water, and after hydraulic cavitation, the surface adsorption water, pore water, and internal water in the sludge will be separated from the sludge after subsequent centrifugal dehydration or filtration pressing, which can greatly reduce the water content of the sludge and the output of sludge sensitization.

2. Hydraulic cavitation wall breaking equipment and working mechanism.

The hydraulic cavitation sludge wall breaking system consists of a pump, control unit and cavitation chamber, and the technology is based on the basic principles of hydraulic cavitation, mechanical shear, energy impact zones, and rapid changes in pressure and vacuum.

The core device of the hydraulic cavitation sludge wall breaking equipment is composed of a pressure equalization chamber and a cavitation chamber, and the sludge is first pumped into the pressure equalization chamber, and then enters the cavitation chamber, where it is forced to rotate at high speed through a truncated nozzle. When the static pressure of the liquid drops below the critical value, the cavity begins to form and expand, with the sudden increase in pressure at the outlet of the nozzle, the cavity can no longer bear the surrounding pressure, the cavity bursts violently, in this process, the cavity will produce extremely high temperature and strong pressure wave around the cavity, and the phenomenon of hydraulic cavitation occurs to complete the wall breaking treatment of sludge.

3. Advantages of hydraulic cavitation sludge wall breaking technology.

1) Strong adaptability, can be combined with a variety of sludge dewatering processes

2) The area before occupying the space is small: the size of the skid-mounted equipment is only.

3) Low operating cost: The operating cost of the equipment is only the power consumption of the pump, and the power is only 7-30kw.

4) Large processing capacity: the smallest model has a single processing capacity of 19m3 h, and the maximum processing capacity is 54m3 h.

5) The treatment effect is remarkable: it can reduce the moisture content of sludge by 8%-15%.

6) Sanitize all kinds of bacteria, parasites, virus cells, etc., and reduce secondary pollution.

7) Stable operation of the equipment: it can run stably for more than 10 years.

8) Short investment period: 1-2 years for equipment.

Deep dewatering should be the moisture content of the leaked potatoes below 60%, which meets the most basic sludge landfill requirements.

Theoretically, mechanical dewatering can be achieved, but the unmodified sludge is a hurdle when the 80% moisture content is clearly judged, and the energy consumption rises sharply to an unacceptable level.

So there are usually 3 ways to do deep dehydration.

1. Sludge modification.

Heating, acid and alkali, electrolyte, etc., are used to break the wall and modify the sludge cells, and release capillary water, adsorption water and internal water.

2. Increase the pressure of mechanical dehydration.

High-pressure plate and frame filter presses, steel belt filter presses, etc., are used to exert much greater mechanical force than conventional mechanical dehydration force to achieve further dehydration effect.

3. Heating and evaporation.

In the dehydration process, some heating and heating devices are used to further reduce moisture.

Generally, the water content of deep deradicalization can reach 30% and 60%, and if it needs to be reduced, it must be achieved through heating and drying.

The sludge dewatering machine is to purify and dewater the sewage that cannot meet the standard, after some purification and dewatering, to meet the discharge standard, and then return to the river.

The sludge dewatering machine has a good effect, energy saving and power saving.

Sludge dewatering machine, sludge extruder.

The use of sludge dewatering machine is what was said on the first floor, but if you want to buy a sludge dewatering machine, I recommend you to go to Shanghai Dazhang Filtration Equipment ****, which is a company specializing in manufacturing, producing and selling sludge dewatering machines, and you have time to take a look.

Sludge dewatering machine has made a great contribution to the protection of human ecological environment, it will play a role in the treatment of sludge after sewage treatment in sewage treatment plants and sewage stations.

Types of sewage desilters:

The adaptation of various sludge dewatering machines is somewhat different, the sludge of the sewage treatment plant is roughly physical sludge, biochemical sludge and physicochemical biological mixture sludge, and there are currently three models of sludge dewatering machine commonly used in China, filter belt type, centrifugal type, spiral ring disc type and plate and frame type.

Sludge dewatering machine of filter belt type: poor adaptability to mixed sludge and biochemical sludge, more sludge reflux, adaptation to physical sludge, and low water content of filter cake, large water consumption for backwashing, high energy consumption, complex maintenance. Spiral Ring Butterfly:

Its disadvantage is that the output is low, and the first generation of dehydrator represented by the 3-4 one-day prototype has been popularized and applied in China. Centrifugal type: all can be adapted to all three types of sludge, its disadvantage is that it is noisy due to its high speed, and its energy consumption is high.

Working principle of sludge dewatering machine::

1. Belt sludge dewatering machine: it is composed of two upper and lower tensioned filter belts with sludge layer, its shape is like an S shape, from a series of circulating roller cylinders, rolling and shearing force on the sludge. Because of its own tension, the capillary water hidden in the sludge layer is separated, and the function of sludge dewatering has been achieved.

2. Centrifugal sludge dewatering machine: it is composed of spiral device materials with a hollow shaft, sludge is fed into the drum by the hollow shaft, and the centrifugal force is thrown into the drum cavity under high-speed rotation, forming solid-liquid separation, because the specific gravity is different, the sludge is transmitted to the cone end of the drum, and is continuously discharged from the outlet under the impetus of the screw conveyor; The liquid discharged from the weir mouth to the outer liquid ring layer of the bowl is discharged by gravity.

3. Stacked sludge dewatering machine: fixed ring, the spiral shaft is formed by holding a series in it, receiving gravity concentration and the internal pressure formed by the sludge by the back pressure plate in the process of advancing to achieve dewatering, and the filtrate is squeezed out of the filter slit formed by the fixed ring and the moving ring, and the mud cake is squeezed from the end of the dewatering part.

4. Plate and frame sludge dewatering machine: the sludge is extruded by the high-pressure pump through the plate and frame, and the water in the sludge is discharged through the filter cloth in a closed state, so as to achieve the purpose of dewatering.

The treatment capacity of the sludge dewatering machine should be controlled within an appropriate range to avoid causing equipment overload to make the system fluctuate frequently and affect the treatment effect because of the sudden increase in load, combined with the flocculant flow rate and the difference degree and the sludge flow rate to adjust, and the treatment efficiency of the larger equipment can be achieved at the same time. , you can get it for free

1.Sludge dewatering is a requirement of environmental policy. The sludge contains a lot of water, and there will be overflow when it is transported directly, and it cannot be transported over long distances. The environmental protection policy requires that it can only be reprocessed after it can be reduced.

2.The need for sludge reduction treatment. The sludge itself contains a lot of water and forms a paste, which is not easy to be transported or re-treated.

Only after the sludge is dewatered, the mud and water are separated, the mud cake and sludge can be easily transported and treated, and the water can also be reused and reused, saving water resources. At present, sludge dewatering is mainly treated in the form of sludge dewatering filter press, sludge dewatering stacking screw machine, sludge dewatering centrifuge, etc.

Sludge dewatering treatment of screw stacker.

Centrifuge sludge dewatering treatment.

Sludge dewatering treatment of filter press.

Because sludge contains a large number of harmful substances, including heavy metals, bacteria, pathogens, etc., if not properly treated, it may have a greater impact on the environment. Nowadays, environmental protection inspections are very strict, and environmental protection inspections and fines alone make illegal pollutant discharge enterprises unbearable, and the cost of illegal pollutant discharge has increased significantly. If the cost of illegal sewage discharge was low in the past, relatively speaking, it is more cost-effective to legally carry out sludge treatment with sludge treatment equipment online, and risking the risk of committing crimes against the wind may lead enterprises to a dead end at any time.

According to the characteristics of sludge, the appropriate disposal method must be selected to achieve reduction, stabilization, harmlessness and recycling.

Sludge is a general term for all kinds of sediments and floating objects produced by different treatment processes in water supply and wastewater treatment. The composition and properties of sludge mainly depend on the composition, properties and treatment process that cannot be treated. According to different classification standards, there are many ways to classify sludge, which are briefly described below.

1) According to the sludge, it can be roughly divided into three categories: water supply sludge, domestic sewage sludge and industrial wastewater sludge.

2) According to the process of sludge separation from water, it can be divided into sedimentation sludge (including physical sedimentation sludge, coagulation sludge, chemical sludge) and biological treatment sludge (refers to the sludge produced by sewage in the secondary treatment process). Most of the sludge in modern sewage treatment plants is a mixture of sedimented sludge and biological treatment sludge.

3) According to the composition and nature of sludge, it can be divided into organic sludge and inorganic sludge. Organic sludge with organic matter as the main component can be referred to as sludge for short. Organic sludge is hydrophilic sludge.

Domestic sewage sludge or mixed sewage sludge are organic sludge. Inorganic sludge with inorganic matter as the main component is often called sediment, and the sediment in the water treatment grit tank and the physical and chemical treatment process of some industrial wastewater are sediment, and inorganic sludge is generally hydrophobic sludge.

4) According to the classification and naming of sludge in different treatment stages, there are raw sludge, concentrated sludge, digested sludge, dewatered and dried sludge, dry sludge and sludge incineration ash. This method is the most commonly used sludge classification method.

To achieve sludge resource treatment, dewatering is an indispensable process. Dewatering is an important process, and choosing the right sludge dewatering agent is also very important.