In the context of rapid development of modern industry, the problem of wastewater discharge is becoming increasingly serious. Various industries such as chemical, papermaking, pharmaceutical, food processing, coal, electroplating and other fields will produce a large amount of industrial wastewater containing suspended matter, organic matter, heavy metals, oil and other pollutants during the production process. In order to meet the requirements of national environmental protection laws and regulations and the goal of sustainable development of enterprises, how to treat industrial wastewater efficiently, economically and environmentally friendly has become a problem that enterprises must solve. As one of the key equipment in the current solid-liquid separation technology, the horizontal screw centrifuge has been widely used in industrial wastewater treatment due to its advantages such as high degree of automation, strong processing capacity and stable operation.
Working principle of horizontal screw centrifuge
Horizontal screw centrifuge, full name horizontal screw discharge sedimentation centrifuge, is a high-efficiency equipment that uses the principle of centrifugal sedimentation for solid-liquid separation. Its basic structure includes a drum, a screw conveyor, a motor, a differential and a control system.
1. Separation mechanism
The material enters the drum through the feed pipe. Under the action of the centrifugal force of high-speed rotation, the solid particles with higher density are thrown to the drum wall to form a solid layer (commonly known as the “slag layer”), while the liquid with lower density moves to the center to form a liquid layer. The screw conveyor has a certain rotational differential relative to the drum, and continuously pushes the deposited solids to the slag discharge port to achieve continuous and automatic slag discharge.
2. Simple diagram of separation process (text version)
Material → Feed inlet → Centrifugal sedimentation in the drum → Solid sedimentation → Screw conveyor → Slag outlet
↘ Liquid clarification → Overflow outlet discharge
3. Operational characteristics
Continuous feeding and discharging, suitable for large-flow wastewater treatment;
Closed operation to prevent secondary pollution;
Automatically control parameters, strong adaptability;
Small footprint, easy installation.
Advantages of horizontal screw centrifuge in industrial wastewater treatment
1. High efficiency separation capability
Horizontal screw centrifuge can achieve rapid sedimentation of solid particles within a few seconds, and the separation efficiency is far higher than that of traditional sedimentation tanks, belt filter presses and other equipment. Even fine particles with a particle size of only a few microns can be effectively separated.
High solid recovery rate: up to more than 90%;
Clear and transparent effluent: extremely low suspended matter content;
Adaptable to materials of different concentrations: stable operation from 0.5% to 30%.
2. Energy saving and consumption reduction, low operating cost
Traditional filter pressing methods usually require the addition of a large amount of flocculants and consume a lot of manpower, while horizontal screw centrifuges can:
Reduce the dosage of reagents by more than 30%;
Save labor costs and operate automatically;
Low energy consumption, more energy-saving than vacuum filtration and pressure filtration.
3. Compact equipment structure and strong adaptability
The equipment is compact in design and occupies a small area. It is suitable for various industrial environments, especially for renovation projects with limited space. At the same time, special structures such as anti-corrosion and explosion-proof can be customized to meet a variety of harsh working conditions.
Typical application cases
1: Wastewater treatment project of a large chemical plant
Background: The chemical plant discharges 500 tons of wastewater per day, with high organic concentration and many suspended solids.
Solution: Two decanter centrifuges are used to replace the original sedimentation tank + filter press system.
Effects:
Treatment efficiency increased by 70%;
Suspended solids removal rate reached 98%.
2: Cleaning wastewater reuse system of a food processing enterprise
2: Cleaning wastewater reuse system of a food processing enterprise
Problem: Cleaning wastewater contains a large amount of starch and organic residues, which affects discharge and reuse.
Transformation plan: Use decanter centrifuge for solid-liquid separation, and the separated liquid enters the secondary biochemical system.
Advantages:
The turbidity of the effluent is reduced by 90%, which is convenient for subsequent treatment;
Solid residue can be sold as feed by-products.
Under the dual pressure of increasingly stringent environmental protection requirements and rising operating costs of enterprises, the decanter centrifuge is becoming the preferred equipment for more and more industrial enterprises in the field of wastewater treatment with its significant advantages of high efficiency, stability, intelligence and energy saving. In the future, with the continuous innovation of technology and the in-depth promotion of intelligent manufacturing, the decanter centrifuge will play a more important role in more subdivided fields and contribute to the promotion of green development of my country’s industry.
If you are facing the problem of wastewater treatment, or want to know more about the customized solution of decanter centrifuge, please contact our engineering team, we will provide you with professional and efficient one-stop solutions.
