Optimum separation
with self-sufficient performance.

A screen that runs and runs and runs.
Top performance with low maintenance.

Optimization of vapour filtration in the animal processing industry

Our processing plant for animal by-products produces vapors that are contaminated with hair, plastic particles and other impurities that arise during the drying process. This wastewater was previously stored in buffer tanks without pre-treatment and continuously fed from there to the wastewater treatment plant via two bag filters. These filters were the weak point of the system, especially at weekends, as they had to be cleaned frequently depending on the contamination of the wastewater.

Customized solution from nrw Anlagentechnik

A specialist friend of ours for freely programmable control systems, who recognized our problem, recommended that we contact the company nrw Anlagentechnik GmbH about this problem. For the inflow of approx. 4 m³ per hour, we decided on the RBS 4 sieve.
We integrated the sieve in such a way that the pipe of the inflow is interrupted and the wastewater is fed directly to the sieve. The screen was installed on a tank in collaboration with the company nrw Anlagentechnik. The tank was fitted with sensors to control the fill level. The pump at the outlet is controlled by a frequency converter. We provided the container and delivered it to nrw Anlagentechnik. The remaining work was carried out by nrw Anlagentechnik.

Trouble-free operation with reduced maintenance requirements

The screen has now been running for over a year without any complaints and fulfills its purpose to our complete satisfaction. We were amazed at the amount of foreign matter contained in the “evaporated wastewater” and that even fine hairs such as pig bristles are easily captured and discharged as foreign matter. Although the bag filters are still in place as police filters, they are only cleaned sporadically as part of routine maintenance.

Maintenance and repairs have not been necessary during the one-year service life. No wearing parts have been required either.

The next optimization step: A finer screen size

We will now take the next step and reduce the hole size of the sieves from 2 mm to 1 mm, actually just to test whether even more can be filtered out.

Screening technology exceeds expectations

The expectations we had of the screen have been fully met, even far exceeded, especially in terms of maintenance, servicing and necessary care, which has been reduced to emptying the separated substances. This is a huge step forward in terms of hygiene and employee workload compared to emptying and cleaning the bag filters, not to mention the time required, which has also been significantly reduced. It goes without saying that regular checks are carried out by our employees to ensure continued safe and error-free operation.