Full Scale Application of Ozone for Bulking Control at a Pulp & Paper Facility, 2013 PEERS Conference

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Bulking and foaming problems are known to be the primary cause of the failure of activated sludge systems. Pulp & Paper plants in particular have significant bulking issues that are likely associated with low DO in selectors, low pH conditions, nutrient deficiencies in the wastewater, and septic conditions due to the presence of organic acids and/or sulphides. To mitigate bulking issues, many pulp and paper facilities apply a variety of strategies such as the use of biological selectors or the addition of chemicals such as chlorine and peroxide. This paper is focused on the application of ozone for bulking control at full scale in a pulp and paper facility located in Spain, which treats about 350 m3/hr of flow. The goal of ozonation was to reduce and to reliably maintain DSVI (ml/g) at target values that enable good settling. A secondary goal was to enhance the dewatered solids content.