Water Clarification with Electrical Energy Generation by Al-H2O2 Galvanic Cell
DOI:
https://doi.org/10.18041/1794-4953/avances.1.5106Keywords:
Coagulation-flocculation, water treatment, electrochemistry, electric energy., water clarificationAbstract
Electrical energy generation by aluminum oxidation produces Al3+ cation and species like Al(OH)3, responsible for inducing flocculation in water treatment. This paper aims to highlight the fact that an Al-H2O2 galvanic cell can destabilize the suspended solids of a water used as cell’s electrolyte, in order to describe a clarification process with electrical energy generation instead of consumption. Thus, a galvanic cell was made by using an aluminum anode, a graphite cathode, H2O2 as oxidant and a clay suspension in KCl solution as electrolyte that simulated the water to treat; removal of turbidity of suspension, potential difference and the generated electrical current were evaluated. The proposed system removed turbidity from water by flocculation and dissolution, as well as generated an average of 0.613 V and supplied 8.51 C at an average intensity of 157 µA. Aluminum hydrolysis eliminated 88.9±1% of turbidity by flocculation, improving to 96.6±1% by addition of H2O2, that solubilized suspended particles, stimulated electrical current generation and mitigated the voltage fall. This way, it is presented a system of obtaining energy from a primary water treatment induced by sub-products of chemical-electrical direct energy transformation.Downloads
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