Abstract:
Electrochemical methods have been increasingly gaining popularity in the field of wastewater treatment. However, the performance of these methods can be highly affected by the polarity
direction as determined by the electrodes arrangement (anode to cathode or cathode to anode); as
well as the characteristics of the wastewater to be treated as determined by the type of wastewater.
The presented research work investigated the relationship between polarity direction and the removal
of pollutants from poultry slaughterhouse wastewater using titanium and aluminium electrode
materials. In the first case, the wastewater was exposed to the Ti (anode)-Al (cathode) combination,
whereas in the second case the wastewater was subjected to the Al (anode)-Ti (cathode) arrangement.
The two cases were designed to see if the polarity direction of the chosen electrode materials affected
the removal of pollutants. The removal efficiencies were computed as a ratio of the remaining
concentration in the treated effluent to the concentration before treatment. It was observed that
the production processes generate highly fluctuating wastewater in terms of pollution loading; for
instance, 422 to 5340 Pt-Co (minimum to maximum) were recorded from color, 126 to 2264 mg/L
were recorded from total dissolved solids, and 358 to 5998 mg/L from chemical oxygen demand.
Also, the research results after 40 min of retention time showed that both electrode arrangements
achieved relatively high removal efficiencies; Whereby, the aluminium to titanium polarity achieved
up to 100% removal efficiency from turbidity while the titanium to aluminium polarity achieved a
maximum of 99.95% removal efficiency from turbidty. Also, a similar phenomenon was observed
from total dissolved solids; whereby, on average 0 mg/L was achieved when the wastewater was
purified using the aluminium to titanium arrangement, while on average 2 mg/L was achieved from
the titanium to aluminium arrangement. A little higher removal efficiency discrepancy was observed
from ammonia; whereby, the aluminium to titanium arrangement outperformed the titanium to
aluminium arrangement with average removal efficiencies of 82.27% and 64.11%, respectively
