The Rotary Drum Screen Filter is a mechanical filtration equipment that consists of several major components such as the transmission device, water distributor, water spraying device, and more. Made of stainless steel, the Rotating Drum Screen works on the principle that the treated water enters the water distributor from the inlet. After a short period of steady flow, it overflows evenly from the outlet and distributes on the rotary drum screener that rotates in the opposite direction. Due to the relative shearing motion generated by the water flow and the inner wall of the rotary drum screens, the solid is retained and separated, and tumbles by the spiral guiding plate and discharges from the other end of the Rotary drum screen. The filtered wastewater flows out from the underneath sink, directed by the protection cover.
The frame of the Rotating Drum Screen filter is equipped with a flushing water pipe and is sprayed with pressure water (3Kg/m²) in a fan-shaped manner. This flushes and dredges the Rotary drum screen to ensure good filtering capability. As a rotary drum screen manufacturer and a worldwide rotary drum screen supplier, NWS offers standard dimensions and stainless steel grades to choose from.
Rotary drum screens are mostly used in places where the daily processed water flow rate volume is low, and the size of the solid waste particles inside the wastewater is small.
There are two types of screens commonly used in rotary drum screens. The first one is perforated, and the second one is wedge wire. Perforated plate screens provide a higher capture rate, while wedge wire screens minimize the risk of clogging with a high permeability ratio.
As compact and portable systems, the installation process of rotary drum screens is easy and requires no infrastructure.
The main purpose of the rotary drum screen is to sort out various fine and coarse matters from water. The process begins with the water flowing into a container, which is then poured onto a circular drum screen. The raw water mixed with debris passes through the drum screen gravitationally and is sifted in the process.
As the drum screen rotates slowly, the debris gets trapped on the surface of the screen. This prevents any build-up and clogging of the sifters. The waste is then drained and scraped off the surface of the screen by an outer scraper mounted on a resort system.
All the waste falls into a hopper, garbage can, or dumpster and is discharged to the outside later. Finally, the drum screen is cleaned with high or medium-pressure water after being scraped.
Fine separation with the sifter
The rotary drum screen is responsible for fine screening based on the chosen mesh size. The mesh sizes range from 0.25 mm to 2.5 mm with the most common being 1 mm.
Two types of rotary drum screens are commonly used
– one with triangular wire and the other with perforated metal sheet. The triangular wire drum screens offer three benefits
– the best transition coefficient, the shape allows the finest particles to slide inside without blocking the slots, and there is no rough side. On the other hand, the flat plate has a rough side due to its manufacturing process. The NWS rotary drum screens are efficient in processing rough waste and greasy effluent, thanks to their triangular wire and outer feed.
All rotary drum screens have similar features:
Sifters are widely used in many activities:
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