The effect of operating conditions, such as initial organic loading (from 1340 to 5370 mg/L chemical oxygen demand (COD)), reaction time (from 30 to 120 min), current intensity (from 5 to 14 A), initial pH (from 3 to 7) and the use of 500 mg/L H2O2 as an additional oxidant, on treatment efficiency was assessed implementing a factorial experimental design.
The experimental results showed that, EC effectively reduced the COD (92%) and colour (98%) of the meat industry wastewater under the optimum conditions such as pH of 7, electrolysis time of 45 min, current density of 35 mandm2 and electrolyte dose of 1.4 g/L, respectively.
Despite the problem of making run-time predictions for a process, based on pre-mortem log data, is an active research topic in Process Mining, current predictive monitoring approaches in this field only support predictions at the level of a single process instance, whereas process performance constraints are often defined in an aggregated form, according to predefined time windows.
This may be due to the differences in how the currents are calculated; averaging global 10 min cadence current functions in the case of AMPERE, each of which are based on spherical harmonic representations of the toroidal field, and, in our technique, estimating the toroidal potential using the magnetic field values directly.
Cells were incubated in the pre-treated LB medium for 15 min without current to evaluate the cellular response to the chemical species generated by the currents, serving as control samples.
The analysis was repeated at more intense conditions, i.e., initial COD up to 10,000 mg/L, reaction times up to 240 min and current up to 30 A; at this level, the effect of treatment time and applied current was far more important than the starting COD concentration.
If Score cur is smaller than Score min, the current step is accepted.
Cyclic voltammetry and fluctuations in the electrode potential were recorded during the 120 min constant current dissolution experiment.
Under optimum conditions (natural pH, time = 33.7 min and current density = 5.55 mabout), about 61% COD removal was achieved.
In the next 30 min, the current decayed to a value too weak for the midlatitude inversion to track.
The best conditions obtained for the electropolishing process are: temperature of 45 °C, electrolysis time of 10 min and current density of around 25 A dm−2.
