Product Overview

This rotary drum screen (also called rotary screen microfilter) is an efficient separation device for suspended impurities like hair, fibers, plastic particles, sediment in wastewater. It is one of the core units for wastewater pretreatment.

Core Structure

It consists of a rotary screen drum, drive motor, reduction device, flushing system, frame, water inlet and outlet.

• The screen drum uses stainless steel wedge wire mesh or punched mesh. The mesh aperture is usually 0.5~5mm (it can be customized according to the particle size of wastewater impurities).
• The flushing system has built-in high-pressure spray heads. These heads are used to backwash impurities trapped on the inner wall of the screen drum. They prevent clogging.

Working Principle

1. Wastewater enters from one end of the screen drum.
2. When the screen drum rotates, water flows through the mesh pores and out. Impurities are trapped on the inner wall of the screen drum.
3. As the screen drum turns, the trapped impurities are carried to the top flushing area.
4. They are washed by high-pressure water and fall into the slag collection tank. This realizes solid-liquid separation.

Advantages of Pretreatment Application

Targeted Performance

It specifically intercepts light impurities like hair, fibers, sediment in car wash wastewater, domestic wastewater. It protects subsequent equipment like water pumps, membrane modules from clogging and wear.

Stable Operation

• It runs automatically and continuously. You don’t need frequent manual cleaning. Its failure rate is low.
• The stainless steel material has good corrosion resistance. It adapts to the acidic and alkaline environment of wastewater.

Small Footprint

It can be installed vertically or horizontally. Its structure is compact. It is suitable for scenarios with limited space like car washes, small wastewater treatment stations.

Adaptation Parameters for Car Wash Wastewater Pretreatment

For 5-20m³/d car wash wastewater, the recommended parameters for the front-end rotary screen are:

• Screen drum diameter: 300~500mm
• Length: 800~1200mm
• Treatment flow: 0.2~1.0m³/h
• Mesh aperture: 1~2mm

It can effectively separate sediment, sponge debris and other impurities in car wash wastewater.

Application Range

The rotary screen microfilter (drum type) has advantages like efficient solid-liquid separation, small footprint, fully automatic operation. It is widely used in municipal, industrial, water supply, aquaculture and special water treatment fields. It is especially suitable for upgrading projects, space-limited and resource recovery scenarios.

1. Municipal Wastewater and Reclaimed Water (The Largest Main Market)

Core Scenarios

• Wastewater treatment plant upgrading (depth filtration after secondary sedimentation tank, SS controlled to 5–8mg/L)
• Reclaimed water reuse (landscape/municipal miscellaneous use/industrial makeup water)
• Initial rainwater treatment
  It is suitable for the end or pretreatment of processes like oxidation ditch, MBR, SBR.

Demand Drivers

• Stricter effluent standards (such as GB 18918 Grade A/B)
• Increased reclaimed water utilization
• Limited space for old plant renovation

Typical Projects

Chengdu No.9 Reclaimed Water Plant, Dongguan Songshan Lake Wastewater Plant.

2. Industrial Wastewater and Circulating Water (High Growth + High Added Value)

Papermaking Industry

• White water fiber recovery (recovery rate up to 98%)
• Middle-stage wastewater pretreatment
  It reduces water consumption by 30%+, improves fiber recovery efficiency, and realizes closed circulation.

Food/Slaughtering Industry

• Fruit and vegetable juice clarification
• Distiller’s grains/protein recovery
• Slaughter wastewater hair/residue removal
  It improves product quality, reduces subsequent biochemical load, and meets discharge standards.

Printing and Dyeing/Textile Industry

• Wastewater pretreatment to remove fibers, dye residues
• Circulating water filtration
  It reduces chemical consumption, protects RO/ultrafiltration membranes, and lowers chromaticity.

Petroleum/Steel Industry

• Oilfield reinjection water treatment
• Circulating cooling water filtration
• Rolling mill wastewater suspended matter removal
  It prevents equipment wear, slows scaling, and meets reuse water quality requirements.

3. Water Supply Treatment and Pretreatment (Stable Rigid Demand)

Waterworks

• Surface water/reservoir water algae removal
• Plankton removal
• Turbidity reduction
  It is used as pretreatment for conventional processes or front-end protection for ultrafiltration/reverse osmosis.

Industrial Water Supply

• Pretreatment of process water in electronics, pharmaceutical, chemical and other industries
  It removes particulate impurities and ensures the safety of subsequent membrane systems.

Rural Drinking Water

• Raw water purification in centralized water supply stations
  It adapts to miniaturization and automation needs.

4. Aquaculture and Special Water Treatment (Emerging Blue Ocean)

Industrial Recirculating Aquaculture System (RAS)

• Filtering residual bait and feces in aquaculture water
  It improves water transparency and dissolved oxygen, and reduces water change frequency.

Seafood Seedling Raising

• Seawater purification
• Removal of plankton and suspended matter
  It ensures the survival rate of seedlings.

Swimming Pool/Landscape Water

• Circulating filtration
• Removal of hair and suspended matter
  It reduces the amount of disinfectant used.

Market Trends and Regional Characteristics

Domestic Market

• Driven by policies (“double carbon”, water environment governance), the market size was about 3.26 billion yuan in 2024.
• It is expected to have a compound growth rate of 12.4% from 2025 to 2030. It is expected to exceed 5.8 billion yuan in 2030.
• East China (Jiangsu, Zhejiang, Shanghai), South China (Guangdong), North China (Beijing, Tianjin, Hebei) are the main demand areas. Central and western regions are rising rapidly with the increase of environmental protection investment.

Overseas Market

• In Southeast Asia, the Middle East, Africa and other regions, due to the growth of municipal wastewater and industrial wastewater treatment demand, the demand for cost-effective, low operation and maintenance cost microfilters is strong.
• It is especially suitable for small and medium-sized projects.

Technology Trends

Modularization, intelligence (remote monitoring, automatic backwash control), corrosion-resistant materials (stainless steel 316L, special coatings), low energy consumption design have become the focus of competition.

Target Customer Profile

Municipal Customers

Local water groups, wastewater treatment plants, sponge city project contractors.

Industrial Customers

Environmental protection departments or EPC general contractors of paper mills, food processing plants, printing and dyeing mills, steel mills, oilfields and other enterprises.

Aquaculture Customers

Large aquaculture bases, RAS system integrators, seafood seedling farms.

Engineering Contractors

Environmental protection engineering companies, water treatment system integrators, equipment agents.