Introduction
The document discusses the ROTAMAT® Membrane Screen RoMem liquid, an ultra-fine screening solution designed for wastewater treatment. It addresses issues such as the removal of fibers and hair, enhancing the operational stability of MBR plants, and reducing COD/BOD in river and sea outfall applications.

The Situation
MBR plants, particularly those with hollow fiber membranes, are prone to clogging due to fibers and hairs. Conventional screens with 3 to 10 mm spacing are inadequate, necessitating finer screens for reliable operation. In regions where raw wastewater is discharged into rivers or seas, ultra-fine screening is crucial for protecting water bodies, especially when combined with chemical precipitation and flocculation.

Our Solution
The ROTAMAT® Membrane Screen RoMem liquid features a drum-shaped screen basket with low flow resistance, suitable for municipal and industrial wastewater flows up to 3500 m3/h. It can be equipped with square mesh sizes as small as 0.1 mm or perforated plates as small as 1.0 mm. The screenings, due to their sludgy consistency, are pumped to the next treatment step and can be used as bulking material in sludge treatment.

The Function
Wastewater enters the screen basket, where solids are retained on the surface. A cleaning cycle starts at a defined water level difference, washing off retained solids with a spray nozzle bar. High-pressure washing prevents fouling and removes grease and oil.

Applications
The screen is used for separating fine solids in municipal and industrial applications. It protects MBR plants by removing fibers and hairs, reduces COD and BOD in outfall applications, and removes algae from eutrophicated waters.

Benefits
The ROTAMAT® Membrane Screen RoMem liquid offers excellent separation efficiency, protects downstream MBR plants, and reduces COD/BOD in outfall applications. It allows for the treatment of fine screenings with coarse screenings, achieving high dewatering results. The unit is corrosion-resistant, made of stainless steel, and requires low maintenance.

Technical Data
The machine is made of stainless steel, with mesh sizes from 0.1 to 1.0 mm and perforations from 1.0 to 2.0 mm. It has a throughput capacity of up to 5000 m3/h and can be installed in channels or tanks.