3.3.1. Experiments
When bacteria were introduced into the process, Fe3þ was
generated and the process became cyclic. Thus, apart from the
oxidationereduction reaction between the iron and copper, there
was another reaction that occurred inside the bacteria. This reaction
transforms the divalent iron, a product of the above reaction,
into trivalent iron (see Fig. 3). Unlike chemical machining, there will
not be deficiency of trivalent iron in the solution.
To analyze the evolution of the removal rate in the presence of
bacteria, some tests were conducted under conditions with and
without shaking and without shaking. For this purpose, two preweighed
samples of OFC were introduced into two identical solutions
of inoculum. Both were tested under a temperature of 26 C,
leaving one under normal conditions and the other one under
shaking conditions at 150 rpm. The analysis of the specimens
during each test was the same as the one performed in the stage of
chemical machining (Section 3.2.1.). The intervals times were 1, 2, 3
and 4.5 h. All tests were also performed in double-blind conditions
to confirm the repeatability of the process.
3.3.1. ExperimentsWhen bacteria were introduced into the process, Fe3þ wasgenerated and the process became cyclic. Thus, apart from theoxidationereduction reaction between the iron and copper, therewas another reaction that occurred inside the bacteria. This reactiontransforms the divalent iron, a product of the above reaction,into trivalent iron (see Fig. 3). Unlike chemical machining, there willnot be deficiency of trivalent iron in the solution.To analyze the evolution of the removal rate in the presence ofbacteria, some tests were conducted under conditions with andwithout shaking and without shaking. For this purpose, two preweighedsamples of OFC were introduced into two identical solutionsof inoculum. Both were tested under a temperature of 26 C,leaving one under normal conditions and the other one undershaking conditions at 150 rpm. The analysis of the specimensduring each test was the same as the one performed in the stage ofchemical machining (Section 3.2.1.). The intervals times were 1, 2, 3and 4.5 h. All tests were also performed in double-blind conditionsto confirm the repeatability of the process.
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