Drum Fine Screen Selection Instructions

Drum screen there are two categories according to the water inlet method:

External drum screen
Internal drum screen

Drum screen working principle

The working principle of the drum screen : In simple terms, the sewage passes through the filter screen to trap large solids and suspended matter on the surface of the screen, and the filtered waste water is discharged through the water outlet tank. Under normal circumstances, the particle size of impurities in the water is relatively small, and the drum type mechanical grid can be used for small particles such as hair. The grid space can be between 0.3-1mm.

The difference between internal water inlet and external water inlet:

the internal water intake pipe directly enters the interior of the drum, and the sewage passes through the inner surface of the screen and the solids and suspended matter are intercepted by the filter, and then rotates through the drum to the slag bucket.

Working principle of external water inlet: Waste water enters the water collection tank and overflows to the surface of the drum screen through overflow. The solid and suspended matter are intercepted by the filter and scraped from the scraper to the slag bucket, and the filtered water passes through the pores of the screen. Drain to the water tank.

Drum screen Composition

Drum-type fine grille is mainly used in sewage treatment and industrial wastewater treatment projects to remove small floating objects in the water. It is often used after the coarse grille. It is mainly composed of reducer, screen, screw shaft, cleaning device, bracket, and slag bucket. System composition:

Usually, the external water inlet drum fine grid is limited by its structure, and the filter grid drum can only adopt the form of wedge-shaped spiral net. The inner water inlet drum fine grid filter grid drum can adopt different filter materials according to different filtering needs, such as: wedge-shaped spiral mesh, perforated plate mesh, stainless steel wire mesh, etc.

Drum Screen Applicable

Drinking water
Urban sewage treatment
Beverage industry
Textile industry
Food processing industry papermaking wastewater
Leather industry
Slaughter industry
Pharmaceutical Wastewater
Petrochemical

Note: perforated mesh or stainless steel wire mesh for grid filter media, usually perforated mesh can be selected for pores above 2mm, and stainless steel wire mesh for those below 2mm. If the customer needs, the spiral wedge net can also be used.