Resumo:
This work aims to evaluate the efficiency of the application of the pulsed
electromagnetic field in the assisted precipitation of calcium carbonate, to decrease the supply
of dissolved calcium in the water, as an innovative strategy to prevent and control the infestation
of the golden mussel (Limnoperna fortunei) in hydroelectric plants. However, pulsed
electromagnetic field applications can also be found to prevent scale build-up in pipes and heat
exchangers, for reducing of hard water.
With an analysis of the actual river water parameters, it can be seen that electrical
conductivity can be used as an indirect approach to monitor the level of calcium carbonate
concentration, and keep the amount of dissolved calcium ions low to minimize environmental
and economic problems caused by the golden mussel.
To obtain the assisted precipitation of the calcium carbonate resulting from the magnetic
force acting on the calcium, bicarbonate and carbonates ions dissolved in the water, a pulsed
electromagnetic field was applied at 90 degrees of the direction of water displacement inside a
plastic pipe, combined with a sudden increase in travel speed.
The correct choice of procedures and the way to conduct the tests to validate the concept
of this work, is essential to ensure that it does not result in low repeatability and reproducibility
in the studies carried out.
