Uppsala universitet, Institutionen för biologisk grundutbildning
Abstract
Deficiencies in biotreatment due to uncontrolled growth of filamentous microorganisms is a problem for wastewater plants worldwide. The project was assigned with the task of reducing the growth of filamentous bacteria at the paper mill SCA Munksund. 12 bacteria and 1 fungi species were presented to the project as problematic due to their filamentous properties. Operating parameters affecting filamentous growth was examined and presented. The information gathered showed that a decrease in filamentous growth for 5 especially problematic bacteria could possibly be achieved by raising the DO, increasing the concentration of nutrients and decreasing the sludge age. Other parameters affecting the growth of filamentous bacteria, such as pH, temperature and F/M were found to be too diverse among the examined species. Alternative solutions not focused on finding optimal operating parameters was also investigated. Promising results were treatment using a feast-famine approach, installation of an anaerobic selector and ozonation of return sludge. A statistical analysis was also performed on operating data. Methods used were Principal component analysis, Clustering and Logistic regression. These were used as a proof of concept rather than providing meaningful data for an operating window
