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Reference- Paper industry

Water treatment and reuse in the paper Industry
ENTRESO has experience with a closed loop system and provides thermophilic membrane bioreactor for VHP Ugchelen. Since the membrane bioreactor operates at a high temperature, the energy yield created by effluent reuse is a significant advantage. Moreover, the system does not produce excess sludge. Dutch VHP company successfully implemented the full-scale cross-flow MBR system.

Keywords: Thermophilic, membrane bioreactor, water reuse, water loop closure, paper industry

VHP Veiligheidspapierfabriek Ugchelen BV located in the neighborhood of Apeldoorn, the
Netherlands, produces paper for bank notes and other security papers, using cotton as raw material. The annual production is about 5,000 tons.

Because the results of the pilot test and the economical evaluation were very promising, VHP decided to construct a full scale unit for treatment of the complete stream of the bleaching process. Because the construction of such a plant was new and very innovative (the first full scale thermophilic aerobic MBR in the world) and was both beneficial from environmental technological and economical point of view, the Dutch Government (NOVEM) decided to partly finance the project. The construction works started in May 2000 and the plant was finished in November. The input COD is 4500 mg/l with pH>12 and 75~85 °C temperature. Based on the costs calculation, the payback time of the treatment plant without grant is around 4.3 years, with grant, the payback time is around 3.3 years.

The membrane bioreactor produces high quality treated water (output COD 400~500 mg/l) that can be reused for many applications. The fresh water intake for bleaching is decreased from 10m3/ton to 2 m3/ton. And the wastewater discharge reduced 50%. These economical and environmental advantages make full scale application feasible. The first full scale thermophilic membrane bioreactor in the Netherlands is in operation since November 2000 and so far results have been very satisfying.

Keywords: MBBR, upgrading, huge capacity, BOD removal

MBBR was used to upgrade of the existing water treatment plant of one paper plant in Italy. Because of changes in the production process there was an increase of the BOD load. The capacity is 2000 m3/day.