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Institut für Wasser- und Umweltsystemmodellierung - IWS



"Adhesive properties of naturally grown biofilm from an eutrophic lake applying MagPI-IP"

Stability of the sediments is governed by number of physical, chemical and biological factors. The stability of the sediment increases over time due to growth of bio_lms at the surface of sediments as it clings more _rmly to the surface. Di_erent approaches to measure the stability of sediments like magnetic particle induction image processing (MagPI- IP), micromanipulation, atomic force microscopy, centrifugation devices, etc. are in usual practice. One of these technique, MagPI, is used and explained in this report. MagPI determines the surface adhesion of the bio_lm in the form of "stickiness. This newly invented technique uses the magnetic attraction of the ferrous particle from the surface of the bio_lm to determine its adhesive strength. The evenly distributed ferrous particles over the surface of the bio_lm are subjected to magnetic _eld generated by electromagnets. The electromagnet is placed 4cm over the surface with a gradual increment in the magnetic _eld.
A set of 96 cartridges and 6 umes were prepared for this experiment. To imitate the property of natural sediment _ne glass beads were _lled in each cartridge. Natural growth environment for bio_lm was provided by water collected from the natural lake Altmhlsee. A varied ow was maintained inside the umes, where 3 umes were kept at high ow and the other 3 at low ow. The umes with higher ow velocity show more stability when compared to the umes with lower ow velocity.
The result of this study shows the accuracy in measuring surface adhesion with MagPIIP method over manual measurements.