The effect of magnetic water treatment on calcium carbonate precipitation on heated surfaces
Može, Matic ...
Physical water treatment incorporates both conventional and unconventional processes based on a number of different mechanisms. The utilization of latter methods has been increasing steadily for the ...last few decades and some of them have already received widespread household applications, e.g., magnetic water treatment devices. Yet, we still do not have a full understanding of the mechanisms behind many of the methods and thus predictions in practical problem solving are often difficult due to the lack of a theoretical background. This project deals with magnetic water treatment (MWT), specifically the calcium carbonate buildup on electric heaters. The buildup is especially problematic in process engineering as it reduces the effectiveness of heat exchangers, cooling towers and other similar equ ipment by both restricting the liquid flow and reducing the heat flux. MWT is supposed to reduce and possibly prevent CaCO3 buildup although the experts are divided on the matter and the reports of experimental results are often contradictory to one anothe r. MWT allegedly increases the portion of the more favorable precipitate polymorph aragonite. Tests were performed on two parallel experimental setups with one setup including a commercially available MWT section "Eko sistemi Mark". In addition to a pum p, each setup included two electric heaters of which one operated continuously and the other in alternating on/off mode. Heat exchangers were used in each setup to maintain constant water temperature. Synthetic hard water was used to eliminate the influence of other components and impurities found in tap water. After multiple weeks of continuous operation, scale buildup on the heated surfaces was examined using x-ray diffraction analysis.
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