Rotary Drum Screen Filter for Wastewater Treatment SS304
The external rotary drum screen is a primary solid liquid separation machine designed for wastewater pretreatment in small and medium treatment plants. It continuously removes suspended solids such as dregs and slag, reducing organic and inorganic load by 30%–60%. This rotary drum screen filter features compact structure, high reliability, and efficient screening performance, making it widely used in municipal and industrial wastewater treatment systems.
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Product introduction of Rotary Drum Screen Filter
The external rotary drum screen is an advanced wastewater screening equipment used for continuous solid liquid separation in pretreatment processes. It is widely applied in municipal and industrial wastewater treatment plants to remove suspended solids before biological treatment.
The system consists of a rotating drum, cover, filtrate tank, transmission device, flushing system, scraper device, and supporting frame. When operating, the gear motor drives the drum to rotate continuously. Wastewater flows through the wedge-shaped screen surface, allowing solids to be intercepted while liquid passes through.
Captured solids are lifted by the rotating drum and discharged via scraper into conveyors or waste containers. A backwashing system ensures continuous cleaning of the screen surface, maintaining high filtration efficiency.
Working principle
The external rotary drum screen operates through continuous mechanical rotation and gravity flow separation. Wastewater enters the rotating drum, where it passes through a wedge-shaped screen surface.
As the drum rotates:
- Solid particles are retained on the screen surface
- Liquid passes through into the filtrate tank
- Solids are lifted by rotation and transported upward
- A scraper removes solids into discharge systems
- A flushing device cleans the screen continuously
This process ensures stable solid liquid separation and reduces downstream biological treatment load.
Product Parameter Table
| 0.25 mm Grid Gap Capacity (m³/h) | 175 |
| 0.5 mm Grid Gap Capacity (m³/h) | 315 |
| 0.75 mm Grid Gap Capacity (m³/h) | 436 |
| 1 mm Grid Gap Capacity (m³/h) | 535 |
| 1.5 mm Grid Gap Capacity (m³/h) | 695 |
| 2.5 mm Grid Gap Capacity (m³/h) | 912 |
| Drum diameter (mm) | 800 |
| Drum length (mm) | 1830 |
| Power (kW) | 1.1 |
Main Features
- Compact structure suitable for limited installation space
- High reliability for continuous wastewater screening operation
- Wedge wire drum surface improves hydraulic efficiency
- Automatic backwashing system prevents clogging
- High solid removal efficiency reduces downstream load
- Simple mechanical design ensures low maintenance cost
- Stable operation for municipal and industrial wastewater
- Energy efficient continuous rotary screening process
- Suitable for pretreatment of high solid content wastewater
- Durable stainless steel structure for long service life
External Rotary Drum Screen vs Static Screen
| Feature | External Rotary Drum Screen | Static Screen |
|---|---|---|
| Operation | Continuous rotation | Passive filtration |
| Efficiency | High solid removal (30–60%) | Medium efficiency |
| Clogging risk | Low (self-cleaning) | Higher |
| Maintenance | Low | Medium |
| Flow handling | Stable and continuous | Limited |
Conclusion: external rotary drum screen provides higher efficiency and lower maintenance cost.
External Rotary Drum Screen vs Fine Screen
| Feature | Rotary Drum Screen | Fine Screen |
|---|---|---|
| Particle removal | Medium-large solids | Fine particles |
| Capacity | High | Medium |
| Maintenance | Low | High |
| Application | Pretreatment | Advanced filtration |
Application Scenarios
- Municipal wastewater pretreatment screening system
- Industrial wastewater solid liquid separation process
- Food processing wastewater solid removal system
- Textile wastewater pretreatment screening equipment
- Paper mill wastewater filtration and screening
- Chemical wastewater solid removal pretreatment system
- Slaughterhouse wastewater screening and separation
- Brewery wastewater solid liquid separation system
- Small and medium sewage treatment plant screening unit
- Industrial process water solid removal system
Why Choose External Rotary Drum Screen
- Efficient pretreatment reduces load on biological systems
- Continuous operation ensures stable wastewater treatment
- Compact design saves installation space
- Wedge wire screen improves separation efficiency
- Automatic flushing system reduces clogging risk
- Low energy consumption compared to fine filtration systems
- Suitable for variable wastewater flow conditions
- Durable stainless steel construction ensures long lifespan
FAQ
1. What is an external rotary drum screen used for in wastewater treatment?
It is used for primary solid liquid separation in municipal and industrial wastewater pretreatment systems.
2. How does an external rotary drum screen filter work?
It works by rotating a wedge wire drum that separates solids from wastewater through gravity and mechanical screening.
3. What is the efficiency of an external rotary drum screen?
It can remove 30% to 60% of suspended solids depending on wastewater conditions.
4. What industries use rotary drum screen filters?
It is used in municipal sewage, food processing, textile, paper, and chemical wastewater treatment.
5. What is the difference between rotary drum screen and static screen?
Rotary drum screen uses continuous rotation and self-cleaning, while static screen is passive and less efficient.
6. Why is an external rotary drum screen important in pretreatment?
It reduces suspended solids load before biological treatment, improving overall system efficiency.
7. Is rotary drum screen suitable for small wastewater plants?
Yes, it is designed for small and medium wastewater treatment facilities.
8. How to prevent clogging in rotary drum screen systems?
Backwashing and continuous drum rotation help prevent screen clogging.
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