Estudo de remoção de precursores de THMs para aguas de abastecimento

AUTOR(ES)
DATA DE PUBLICAÇÃO

1998

RESUMO

In 1974, the haloforms presence in water supply was documented for the first time. Studies conducted by U. S. Environmental Protection Agency (USEPA) detected the presence of potential carcinogens, in the trihalomethane form (THMs) in the water supply of several areas in the USA. Some traditional methods for the reduction of the concentration of THMs in the finished water may be inappropriate or less effective than the removal of its precursors. Both Potassium Permanganate (KMn04) and the Powdered Activated Carbon (PAC) were individually investigated and combined, to determine the effectiveness in the removal of the potential formation of THMs. The efficiency of those products was evaluated by using "jar-test". The results indicated that, in the adsorption mechanism, the removal of the humic acid was practically complete, in the range of 97 % to 98%, when only the coagulant was used in the optimum dose for the due pH value. Therefore, there is no need of the use of PAC and potassium permanganate for direct filtration. When the sweep mechanism was obtained, the removal of humic acid was observed in the range of 71 % to 91 %. The use of PAC caused an increment of removal of that composition to the range of 96 % to 98 % due to both the optimum coagulant dose and the respective coagulation pH. The use of KMn04 prior to the addition of PAC increased the efficiency to the range of 98 % to 100 %

ASSUNTO(S)

absorção acido fulvico oxidação permanganato de potassio acido humico

ACESSO AO ARTIGO

Documentos Relacionados