With the continuous acceleration of industrialization and the rapid growth of urban population, water pollution problems are becoming increasingly serious. Sewage treatment and sludge dewatering have become important components of urban infrastructure construction. In sewage treatment plants, a large amount of organic sludge, chemical sludge and industrial mixed sludge need to be efficiently treated, reduced and stabilized to reduce the impact on the environment and meet the standards for discharge or resource utilization. Decanter Centrifuge, as one of the most advanced solid-liquid separation equipment, is playing an irreplaceable and important role in water treatment plants.
Basic Overview of Decanter Centrifuge
Decanter centrifuge, known as horizontal screw centrifuge, is a kind of high-efficiency centrifugal separation equipment. It utilizes the density difference between solid and liquid phases, and accelerates the settling speed of solid phase particles under the action of centrifugal force, thus realizing solid-liquid separation. Decanter centrifuge has the characteristics of compact structure, continuous operation, smooth running, strong adaptability, large production capacity, easy maintenance and so on.
Working principle of decanter centrifuge
The working principle of decanter centrifuge is that the drum and screw rotate at high speed in the same direction with a certain differential speed, and the material is continuously introduced into the inner cylinder of the feeding screw from the feeding pipe and accelerated into the drum. Under the action of centrifugal force field, the heavier solid-phase material is deposited on the wall of the drum to form a slag layer, which is pushed to the cone end of the drum by the spiral pusher and discharged. The lighter liquid phase forms the inner liquid ring, which overflows continuously from the overflow port at the big end of the drum, thus realizing solid-liquid separation.
Application scenarios of decanter centrifuges in water treatment plants
In water treatment plants, after sewage is pretreated, biochemically treated, and precipitated, a large amount of residual sludge and concentrated sludge will be produced. If not treated in time, these sludges will produce odor, harmful microorganisms, and even cause secondary pollution. The decanter centrifuge mainly plays a role in the following key links:
1. Sludge dehydration
The moisture content of sludge is as high as over 95%, and the transportation and disposal costs are extremely high. The decanter centrifuge can quickly separate the water in the sludge, reducing the moisture content to below 70% or even 60%, greatly reducing the sludge volume and reducing the subsequent transportation and landfill costs.
2. Concentration and classification treatment
For primary sludge or mixed sludge, the decanter centrifuge can first concentrate the sludge to provide an ideal solid content ratio for subsequent drying or incineration processes. At the same time, its structure can achieve effective classification of particles of different particle sizes and improve the overall processing capacity of the system.
3. Stable guarantee of high-load operation system
In special circumstances such as industrial parks and rainy season rainstorm emergency, the water inlet load increases dramatically, and traditional gravity concentration is difficult to meet the demand, while the horizontal screw centrifuge can be quickly activated and stably operated, effectively relieving the system pressure.
4. Strong adaptability to various water qualities
Whether it is domestic sewage, papermaking wastewater, printing and dyeing wastewater, or organic sludge in food processing and pharmaceutical industries, the horizontal screw centrifuge can achieve the best treatment effect by adjusting the speed, differential speed and flocculant dosage according to different water qualities.
Core Advantages Analysis
1. Efficient dehydration and reduced processing costs
Compared with traditional plate and frame filter presses or belt filter presses, decanter centrifuges have more advantages in dehydration efficiency, continuous processing capacity and automation level. For example, a decanter centrifuge with a processing capacity of 20m³/h can reduce several tons of sludge moisture per hour, saving hundreds of thousands of yuan in transportation costs per year.
2. Small footprint and flexible installation
The decanter centrifuge has a compact structure, small size and high modularity, which is suitable for new construction and renovation projects. It can be quickly deployed even in underground sewage treatment plants with limited space.
3. Simple operation and intelligent control
Our decanter centrifuge can be equipped with a fully automatic control system with one-button start, self-diagnosis alarm, remote control and other functions to minimize human dependence. The operating data can be monitored in real time through the touch screen or the host computer, and the operating parameters can be adjusted in time.
4. Environmental protection and energy saving, stable operation
Adopting variable frequency drive technology, the starting current is small, and the operating power is automatically adjusted according to the load, saving energy and reducing consumption. At the same time, the equipment structure has been optimized over a long period of time, with a long maintenance cycle and low noise, which complies with the design concept of environmentally friendly factories.
Under the background of “dual carbon goals” and “Beautiful China” construction, water resource protection and sludge reduction have become key tasks of the environmental protection industry. Decanter centrifuges are being adopted by more and more water treatment plants due to their high efficiency, energy saving, environmental protection and intelligence.
As China’s leading manufacturer of decanter centrifuges, we not only have mature design and manufacturing capabilities, but also have rich project experience and a complete after-sales service system. We are willing to work with more water companies, design institutes, and engineering companies to jointly promote the high-quality development of the sewage treatment industry and contribute to protecting green waters and green mountains
