CirTec - Discfilter - Nijhuis Saur Industries

CirTec – Discfilter

Discfilter for effluent polishing

Water flows into rotating discs lined with micro fabric, filtering from the inside out. Solids stick to the panels, clean water passes through. When buildup occurs, the discs rotate to expose fresh surface and rinse away debris via a central drain. Simple, effective, and self-cleaning.

Your challenges

Removing fine solids for effluent polishing

Effluent polishing and water reuse require the effective removal of very fine suspended solids. Filtration systems must deliver consistent performance under varying loads.

Preventing clogging and overflow risks

As solids accumulate on filter media, clogging can occur, leading to rising water levels, process instability, and potential overflow situations. A robust design is essential to ensure safe and continuous operation.

Efficient operation with low energy and water consumption

Wastewater treatment plants aim to minimize operational costs. This requires filtration systems with low headloss, limited backwash water demand, and minimal energy consumption.

Upgrading existing installations

Many plants seek to improve filtration performance without major civil modifications. Retrofit-friendly solutions that reuse existing tanks and concrete structures are key.

Easy maintenance and long service life

Maintenance should be simple and fast, without the need to empty tanks or disassemble the entire unit. Durable materials and easy replacement of filter media reduce downtime and lifecycle costs.

How does it work?

The process

Water flows by gravity into the central drum and passes inside-out through filter panels on both sides of each disc. Solids are trapped inside; clean water flows out into the surrounding tank. Discs stay 65% submerged and remain still—until clogging raises the water level. Then, the backwash kicks in: discs rotate, solids are rinsed off with filtered water via easy-to-maintain nozzles, and discharged. Simple, smart, and self-cleaning.

Our positive impact

High efficiency washing system

The Disc Filter’s pleated media design offers quick release cleaning for efficient cycling without labor-intensive maintenance. This and other features improve the cleaning process while helping prevent media wear. The specially designed spray mechanism offers twice as many nozzles in a configuration that efficiently releases solids from the pleated media. The inherent simplicity of our configuration minimizes lifetime costs with fewer moving parts and lower energy demands for backwashing.

Replacing Discs

Each disc can be easily replaced in a matter of seconds, simply by loosening the locking screws. The panels can be easily and fast removed with no need of emptying the tank or disassemble the filter.

Modular design

Modular design with maximum flexibility for possible future expansion and/or different effluent requirements.