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PASCHOALATO, C. F. P. R. (2005). Effect of preoxidation, coagulation, filtration, and post-chlorination on the formation of halogenated organic byproducts in water prepared with humic substances. São Carlos, 2005, 148p. Thesis (Doctorate), Escola de Engenharia de São Carlos, Universidade de São Paulo. The presence of humic substances in water destined for supply has brought many problems, resulting from the formation of halogenated organic subproducts, especially when preoxidation with chlorine is used. Halogenated organic compounds, which are admittedly carcinogenic and can be found in water treated and distriduted for the population, are: trihalometano, haloacetic acid, haloaldehyde, haloacetone, halophenol, and halopicrin. In water treatment stations for plants (WTPs), the use of preoxidation with chlorine of the raw water contributes for forming such byproducts. This research aims at evaluating the potential for the formation of twenty two byproducts using the following preoxidants: chlorine, chlorine dioxide, potassium permanganate, hydrogen peroxide, ozone, and peroxone. The potential of byproducts formation was simulated in water prepared with addition of humic substances extracted from peat soil by the use of different chemical products in pre-oxidation, coagulation, filtration, and postchlorination. Byproducts have quantified by gas chromatography with electron capture detector. The results obtained showed that the use of alternative preoxidant, such as: chlorine, chlorine dioxide, potassium permanganate, hydrogen peroxide, ozone, and peroxone, associated with coagulation, filtration, and post-chlorination form a minimum of byproducts. Key-words: humic substances; preoxidation; byproduct formation; halogenated compound.

Efeito da pré-oxidação, coagulação, filtração e pós-cloração na formação de subprodutos orgânicos halogenados em águas contendo substâncias húmicas