In today’s society where industrial production is growing, environmental protection regulations are becoming increasingly stringent, and wastewater treatment has become the top priority for enterprises’ green transformation. Especially in high-pollution industries such as steel, chemical, papermaking, electroplating, pharmaceutical, printing and dyeing, and food processing, how to achieve wastewater resource utilization and harmless treatment is not only related to the survival and development of enterprises, but also to environmental protection and the fulfillment of social responsibilities. Among the many wastewater treatment equipment, the Decanter Centrifuge is widely used in various industrial wastewater treatment projects due to its compact structure, stable operation, high dehydration efficiency, energy saving and environmental protection, and other advantages. It has become a key equipment to achieve the goal of “reduction, resource utilization, and harmlessness”.
Basic Principle and Working Mechanism of Decanter Centrifuge
Decanter centrifuge is a device that uses centrifugal force to achieve solid-liquid separation. It is mainly composed of a drum, a screw conveyor, a drive system, a differential, a frame and a control system. Its basic working process is as follows:
After the solid wastewater enters the centrifuge, it is accelerated to the same speed as the drum;
Under the strong centrifugal force formed by high-speed rotation, the solid particles settle to the inner wall of the drum;
The screw conveyor rotates slowly at a differential speed, pushing the deposited solids to the slag outlet for discharge;
The clarified liquid is discharged from the overflow port at the other end to achieve solid-liquid separation.
This structure enables the decanter centrifuge to achieve continuous feeding, separation and slag discharge, which is especially suitable for treating complex industrial wastewaters with high water content, high concentration and high viscosity.
Core advantages of decanter centrifuge in industrial wastewater treatment
1. Efficient dehydration, significant reduction
Decanter centrifuge has strong dehydration capacity, which can reduce the water content of solids in sludge or sewage to below 60-70% (depending on the nature of the material). Compared with traditional filter press and thickening tank treatment methods, the volume and weight of solids are greatly reduced, saving a lot of costs for subsequent transportation and treatment.
2. Continuous operation, high degree of automation
Traditional filter press equipment usually requires tedious operations such as manual cloth replacement and filter residue cleaning, while decanter centrifuge can achieve:
Continuous feeding and discharging, uninterrupted processing;
Fully automatic control system, unattended operation;
One-button start and stop, adapt to the needs of different processing loads.
This is especially important for enterprises with strong continuity of wastewater discharge and large processing load.
3. Small footprint and flexible installation
The decanter centrifuge is an integrated closed structure with a relatively compact size. It can be directly installed in the existing sewage treatment process system, suitable for space-constrained plant areas or old system renovation projects.
4. Low energy consumption, energy saving and environmental protection
Through frequency conversion control, high-efficiency motors, intelligent differentials and other configurations, the horizontal screw centrifuge performs well in energy consumption control:
The average energy consumption per ton of sludge treated is more than 20% lower than that of traditional equipment;
Save flushing water and reduce the amount of dosing;
Reduce the overall carbon emission load and help enterprises achieve the “double carbon” goal.
Energy-saving performance: Helping enterprises reduce costs and increase efficiency
Energy saving is one of the core goals of enterprise management. The horizontal screw centrifuge achieves effective control of energy consumption through a number of technical means:
1. High-efficiency motor + intelligent frequency conversion system
Automatically adjust the motor speed according to the material flow and properties;
Avoid idling and overload, improve energy efficiency ratio;
Reduce unnecessary startup and shutdown times, and reduce instantaneous load impact.
2. Optimize differential design
Advanced planetary differential or hydraulic differential system reduces energy loss while achieving precise slag discharge control, so that every kilowatt-hour of electricity can be used to the maximum effect.
Typical industry application cases
Case 1: Renovation of wastewater treatment system in a chemical plant
Background: The original belt filter press was used to treat oily wastewater, with low treatment efficiency and high sludge moisture content.
Renovation plan: Introduce 2 decanter centrifuges to replace the old equipment.
Effect:
The sludge moisture content dropped from 85% to 68%, saving 700,000 yuan in transportation costs per year;
Fully automatic operation saves 250,000 yuan in labor costs per year;
The wastewater meets the discharge standards and passes the environmental protection acceptance.
Case 2: Wastewater reduction project in a food processing plant
Background: The organic matter content of slaughter wastewater is high and fluctuates greatly.
Solution: Install decanter centrifuge and link it with flocculation and dosing system.
Results:
The effluent is clear and COD is greatly reduced;
The wastewater treatment capacity is increased by 1.5 times to meet the needs of production expansion;
It was rated as a “green demonstration factory”.
In the context of energy conservation and emission reduction becoming a national strategy, enterprises should not only focus on profits, but also shoulder the responsibility of environmental protection. As an efficient, intelligent and environmentally friendly wastewater treatment equipment, the decanter centrifuge has become a key tool to promote green production in enterprises. It can not only help enterprises reduce operating costs and improve treatment efficiency, but also enable enterprises to handle environmental protection audits with ease, establish a responsible brand image, and win recognition from the government, the market and society.
If your company is facing wastewater treatment problems or hopes to optimize the configuration of environmental protection equipment, the decanter centrifuge is undoubtedly a trustworthy choice.
