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Domů / References / How our Microscreen Drum filters helped recirculate wastewater in a paper mill and thus significantly reduce the mill’s operating costs

How our Microscreen Drum filters helped recirculate wastewater in a paper mill and thus significantly reduce the mill’s operating costs

Capture of leakages and recovery of valuable materials for return to production Reduction of operating costs Removal of suspended solids Phosphorus reduction (down to 0.1 mg/l) Removal of suspended solids – tertiary polishing BOD and COD reduction
Equipment

Microscreen Drum filter

Qproject

28,5 l/s and 16,5 l/s

Influent TSS

80 mg/l and <30 mg/l

Effluent TSS

<30 mg/l and <15 mg/l

Filter cloth

30 μm and 20 μm

At the Metsä Tissue paper mill in Germany, we implemented two-stage filtration after a vacuum disc filter cleaning process water from the paper machine. The wastewater is subsequently filtered using a system of our Micro Drum Screen Filters and then reused in the paper mill production process. This saves considerable operating costs and conserves drinking water resources.

Type: 4FBO and 5FBO

Quantity: 2 + 1 pcs

Qproject: 28.5 l/s and 16.5 l/s

Filter cloth: 30 μm and 20 μm

TSS inflow: 80 mg/l and <30 mg/l

TSS outflow: <30 mg/l and <15 mg/l

Location: Water recirculation in a paper mill

Solution and benefits


A Vacuum disc filter used to be employed in paper mill water recirculation systems instead of DAF. However, it has the disadvantage that at its outlet the residual paper fibers are broken into very small particles, which makes conventional filtration difficult.

In the first step, 2 pcs of our 4FBO Microscreen Drum filters with 30 μm filter cloth were installed. This achieved such effluent quality that the water could be reused for the spray nozzles of the paper machine.

In the second step, a 5FBO Microscreen Drum filter was installed to filter part of the effluent from the two 4FBO filters. It is equipped with 20 μm cloth and achieves output water quality suitable for subsequent use for sealing and cooling of vacuum pumps.

Thanks precisely to retaining the original treatment stage in the form of a Vacuum disc filter, this was an atypical and demanding application compared to conventional solutions using DAF in combination with Microscreen Drum filters. The entire implementation was preceded by a series of on-site filtration tests directly in the paper mill operation.

Thanks to its technical design and overall contribution to saving process water, this application offers a very fast return on investment. After accounting for filter operating costs, the payback was within 0.5 year.