Electrochemistry control of humic acid and algae using a reactor with diamond film electrode / Controle eletroquimico de acido humico e algas usando um reator com eletrodo de filme de diamante

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The presence of humic acids and algae in supplying water and swiming pools may be harmful to the health. This work reports the results obtained in electrooxidation of humic acid and algae using a boron doped diamond (BDD) anode. In this treatment, the solution is percolated through a filter press reactor with a BDD anode polarized at constant current. The efficiency of the treatment was characterized by following concentrations of Total Organic Carbon (TOC), Chemical Oxygen Demand (COD), algae activity by a-chlorophyll indicator, Total Phenols (TP) and color by UV-Vis. In the first experiments a phenol solution was used and the reactor was operated in conditions of mass transfer control. Calculated mass transfer coefficients were around 10-5 m s-1. Then, experiments were run at controlled current with 3 L of destilled water, pH 7.2, in which 50 mg L-1 of humic acid was added plus K2SO4 for conductivity of 20 mS. Reactor flow rate of 820 L h-1, current density of 30 mA cm-2 and temperature of 30ºC were used. TOC, COD, TP and color were followed and concentrations decay showed a pseudo-first order kinetic. As final experiments, no corrections on the original conductivity solution values (3.5 mS) were done with pond water. By following the same parameters, substantial concentrations reduction were observed and the same type of kinetic

ASSUNTO(S)

oxidação eletrolitica piscinas chemical reactors algae reatores quimicos alga acido humico humic acid electrolytic oxidation swimming

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