Evaluation of the Physical–Chemical Characteristics of Wastewater After Disinfection with Peracetic Acid

Cavallini, Grasiele Soares; de Campos, Sandro Xavier; de Souza, Jeanette Beber; de Sousa Vidal, Carlos Magno

Evaluation of the Physical–Chemical Characteristics of Wastewater After Disinfection with Peracetic Acid

2013

Cavallini, Grasiele Soares | de Campos, Sandro Xavier | de Souza, Jeanette Beber | de Sousa Vidal, Carlos Magno

The use of peracetic acid (PAA) in the disinfection of sanitary effluents has been proposed by various authors. However, there are still doubts about its influence on the physical-chemical characteristics of the effluent after application. In the present study, it was observed that the composition of PAA leads to an increase in organic material, resulting in an increase of approximately 20 mg/L in the chemical oxygen demand of the effluent for every 10 mg/L of PAA applied. According to the kinetic tests, the degradation of PAA in the effluent was represented by a first-order reaction and its half-life in the effluent was estimated at 79 min. The formation of by-products resulting from degradation of PAA in the effluent was evaluated by considering by-products already detected by other authors in disinfection trials, these being nonanal, decanal, chlorophenols, and 1-methoxy-4-methylbenzene, which were not observed in the effluent being studied after application of PAA at a dosage of 10 mg/L. © 2013 Springer Science+Business Media Dordrecht.

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