Advanced Effluent Treatment with Ozonation and Biofiltration at the Paper Mill SCA-Graphic Laakirchen AG - Austria: Design and Operation Experience

Authors: Kaindl, Nikolaus¹; Liechti, Pierre-Andre²

Source: Ozone: Science and Engineering, Volume 30, Number 4, July 2008 , pp. 310-317(8)

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Abstract:

The paper mill “SCA GRAPHIC LAAKIRCHEN AG” is situated in Austria and produces 486,000 to of graphic paper per year. A yearly amount of 6,923,000 m3 of wastewater with a COD-load of 7,819,000 kg is treated on site (2005). The trend towards brighter paper grades requires more intense bleaching of mechanical pulp and increased usage of chelating agents and optical brighteners. These chemicals are difficult to degrade with biological waste water treatment. Higher bleaching dissolves more lignin, which is hard to degrade as well. As a result the COD removal efficiency in the biological stage of the wastewater treatment plant drops and additional measures for enhanced COD reduction have to be implemented in order to maintain given discharge limits.

Keywords: Ozone; Biofiltration; Hard COD; COD Reduction; Tertiary Treatment; Advanced Waste Water Treatment; Pulp and Paper Waste Water Treatment

Document Type: Research article

DOI: http://dx.doi.org/10.1080/01919510802158077

Affiliations: 1: SCA Graphic Laakirchen AG, Laakirchen, Austria 2: Ozonia AG, Dubendorf, Switzerland

Publication date: 2008-07-01