When comparing cost-effectiveness, decanter centrifuges are typically preferred. However, conventional filtration offers its own benefits, such as reducing water content in the solid phase. If flexibility and high capacity are top priorities, a decanter centrifuge may be the best option. Alternatively, those with ample space and a need for drier solids may opt for conventional filtration. Experience efficient, versatile separation with our dual-functioning decanter centrifuge. And for applications that require drier solids, our conventional filtration system is a reliable and effective choice.
Horizontal screw centrifuge definition
The decanter centrifuge utilizes powerful centrifugal forces to separate solids from liquids in slurries through sedimentation. A feed pipe directs the slurry into an annular screw conveyor with a tapered end, leading it into a rotating drum that operates at a higher speed than the conveyor.
The strong force of gravity causes the solid particles in the slurry to be thrown against the bowl wall, and the screw conveyor steadily pushes them toward the discharge end. As the particles approach the discharge end, the tapered end of the screw removes excess water. The water flows effortlessly to the other end of the machine and flows out through the designated port.
Decanters are efficient in producing solid cake material that can be easily disposed of mechanically, while also allowing for immediate recycling of process water. They operate by releasing the solid material at a point between the filter press and the thickener. Additionally, decanters feature fully automated and closed systems, allowing for cleaner, more efficient operation. With fully automated and closed systems, decanters offer cleaner, more efficient operation. Additionally, they are efficient in producing solid cake material that can be easily disposed of. With a decanter, you can also immediately recycle process water, making it an environmentally friendly choice.
Benefits of using a decanter centrifuge
Efficient separation:
The decanter centrifuge can achieve continuous D feeding, separation, washing and unloading at full speed. This continuous operation mode not only improves production efficiency, but also ensures the stability and reliability of the separation process. Due to its efficient separation capacity, the decanter centrifuge can quickly and effectively separate the solid and liquid phases in the wastewater.
Compact structure and small footprint:
The decanter centrifuge adopts an integral frame structure with a compact design and small footprint. This makes it very suitable for use in wastewater treatment sites with limited space, and is also easy to hoist and transport.
Smooth operation and strong adaptability:
The horizontal screw centrifuge has strong adaptability to materials and can handle suspensions containing solid matter with a particle size greater than 0.005mm and a concentration range of 2% to 40%. It implements precise dynamic balancing of rotating parts and dynamic balancing of the whole machine’s working speed to ensure smooth operation.
Low energy consumption and environmental protection:
The horizontal screw centrifuge adopts advanced variable frequency speed regulation technology, which has little impact on the power supply network and low energy consumption. At the same time, since it treats wastewater under completely closed conditions, there is no pollution to the operation site, which can keep the production environment clean and hygienic, and meet environmental protection requirements.
Limitations of using a decanter centrifuge
Particle Size
The biggest disadvantage of using a decanter is that it can only remove particles as small as 5 microns, so it is slightly less effective than filtering. Smaller sediments will remain in the oil, and the oil may still contain a small amount of solids (by weight) after leaving the decanter. A few tenths of this percentage may not seem important, but depending on your target market, this small difference can greatly affect the value of your oil.
Maintenance Costs
Due to their high spinning speeds, centrifuge parts wear out much faster than filters. Replacing these heavyweight parts is costly, especially the bearings, which typically wear out within a few years. While the upfront cost of a centrifuge is lower than an oil filtration system, these ongoing maintenance costs can quickly add up.
Energy Use
Decanters require a motor to keep the shaft spinning. The system consumes more electrical energy than oil filtration, which consumes about 60-75% less energy. In any case, conventional filtration takes up a larger floor space than a decanter.
Traditional Filter Definition
To achieve the highest level of mechanical dewatering without the use of chemicals, conventional filtration methods involve the use of concave plates wrapped with filter cloth. These plates are fixed to create chambers, which quickly contain the mud and allow the liquid to pass through the filter cloth. The filtrate is then collected in a trough at the bottom of the filter press, while the solids are held against the filter cloth. Once the mud can no longer be pressed, the pump stops and the plates open to release the solid cake.
These durable cakes are non-dripping, stackable, and easily managed for loading or transportation. Depending on the material, they can be sold as backfill or pond liner. The collected water can be utilized without delay.
Advantages of using conventional filters
Energy consumption and costs
Compared to decanters, conventional filtration has lower energy consumption for the following reasons:
The hydraulic motor operates during the processes of opening, draining, and closing, and intermittently during maintenance of pressure, while the decanter motor operates continuously throughout these procedures.
The energy required for the filter press is lower, which reduces operating costs.
Maintenance costs and downtime
When dealing with more abrasive feed streams, the high speed of the rotating parts on a decanter centrifuge can lead to increased wear. This means that using decanter centrifuges can be more costly to operate compared to conventional filtration.
The decanter centrifuge has a more intricate process and functionality compared to the traditional filtration method that utilizes a filter press.
Rewrite instructions: Decanters often experience issues with their rotating bearings and internal parts. Special equipment and tools may be needed for disassembly, depending on the source of the decanter. In comparison, filter presses have a simpler design with fewer moving parts, making them easier to disassemble and maintain.
The decanter centrifuge boasts numerous advantages in treating wastewater, including efficient separation, compact design, stable performance, low energy usage, environmental friendliness, easy maintenance, extended lifespan, and advanced automation. These benefits have contributed to the widespread adoption and promotion of decanter centrifuges in the wastewater treatment industry.