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Institut für Wasser- und Umweltsystemmodellierung - IWS



"Applying MagPI To Determine Adhesiveness In Matured Biofilm"

The development of biofilm on sediment surface can enhance the adhesion of substratum as well as to improve sediment stability. Extracellular polymer substances (EPS) produced during the formation of biofilm act as a glue to bind sediment particles together thus increasing their stability. The adhesiveness of biofilm throughout their development on the artificial sediments have been investigated in the laboratory using magnetic particle induction (MagPI) which is a device based on the magnetic attraction of magnetic particles that sits on the biofilm surface. Measurements of biofilm adhesion obtained by the MagPI system have been related to EPS (protein and carbohydrate). Flumes experiment under two different flow treatments have been prepared to be compared with each other while SETEG measurement has been also included in this study to be compared with MagPI measurements. The results of biofilm adhesiveness show a continuous increase from the beginning of experiment unt il they reached matured state between day 25 and day 40. The biofilm under low flow treatment reached matured state quicker compared to the biofilm growth under high flow. After they reach maturity, there are consistent reading and very small increment in the MagPI readings in plateau state. This result shows that biofilm growth may become thicker, which increase EPS concentration, but not contribute to increasing of biofilm adhesiveness in this state. Biofilm presented different profiles of EPS carbohydrate and protein, depending on the flow conditions in which the biofilm was grown. Both EPS readings under high flow treatment have a greater value than those in the low flow treatment. There are positive relationships between biofilm adhesiveness and EPS (protein and carbohydrate) under high flow and low flow treatments.