24 PRODUCTS & SERVICES
Pulp Paper & Logistics
Zero water consumption in paper mill operations within grasp
A
water-management system has been developed for paper maker Progroup AG in
Germany that consumes ultra- low volumes of fresh water, along with reducing carbon dioxide emissions. And a zero effluent version is possible. Voith designed a system in its AquaLine range that when installed at Progroup’s mill at Sandersdorf-Brehna consumes just 1.5 litres of water per kilogramme of paper produced. AquaLine Zero is the most sophisticated offering in the AquaLine range. With the basic AquaLine version, water consumption is 5.5 to 7 litres per kg of paper, while AquaLine Flex combines biological treatment plant with filtering systems to achieve consumption of less than 5.5 litres per kg. AquaLine Zero further reduces fresh water
Voith’s AquaLine Zero ‘biological kidney’ water treatment process is capable to cutting consumption to zero
consumption. It also enables complete closing of the water circuits and thereby cuts the effluent volume to zero. “With this system, the customer
requires only about 1.5 litres of fresh water to produce one kilogramme of paper in their plant,” explains Eckhard Gutsmuths, product manager of
low effluent mill at Voith. “At the same time, they have reduced their carbon dioxide emissions by about 10 per cent.” Progroup AG’s aim to keep its use of resources as low as possible without having to compromise production quality has been realised at the plant, which produces 750,000 metric
tons of testliner and corrugating medium a year. About 8,500 litres of fresh water can be saved each day with the integrated, closed-loop water treatment plant. For closed water circuits with AquaLine Zero, the biological treatment plant operates exclusively by means of an anaerobic process, the so-called ‘biological kidney’. All the purified water is returned to the stock preparation process, which means the effluent volume is zero. In addition, filtering systems in the process water circuit of the paper machine allow for purified process water to replace the fresh water, reducing the consumption considerably. The exclusively anaerobic process produces a large volume of biogas, which can be used as primary energy, cutting both energy costs and carbon dioxide emissions.
Bigger shaking unit launched by Voith
The DuoShake shaking unit has been upgraded by Voith with an 800nM drive motor and the latest control and automation technologies. This complements the DuoShake DG designed for 250nM, with both variants having a stroke length of up to 35mm. The DuoShake 800 DG
optimises the alignment of the fibres in the cross direction and contributes to a homogeneous fibre distribution through a high-frequency shaking of the breast roll.
July/August 2021 The shaking unit builds on
several design innovations that lead to increased paper quality
and production speed. For example, the base only has to support the unit’s own weight,
Voith’s latest shaking unit optimises the alignment of the fibres in the cross direction
the design avoiding reaction forces being transmitted to the foundation, headbox or wire section. “After installing and activating the DuoShake DG, the customer achieved an immediate increase in CD strength, which enabled a significant reduction in basis weight,” says Mitch Kilmer, director of paper machine applications at Voith Paper North America. “The resulting increase in MSF yield per ton allowed for a very short payback time on the investment.”
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