Factorial design application in photocatalytic wastewater degradation from TNT industry—red water

In trinitrotoluene (TNT) purification process, realized in industries, there are two washes carried out at the end of the procedure. The first is performed with vaporized water, from which the first effluent, called yellow water, is originated. Then, a second wash is performed using sodium sulfite,...

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Bibliographic Details
Published in:	Environmental science and pollution research international 2017-03, Vol.24 (7), p.6055-6060
Main Authors:	Guz, Ricardo, de Moura, Cristiane, da Cunha, Mário Antônio Alves, Rodrigues, Marcio Barreto
Format:	Article
Language:	eng
Subjects:	AOPs: Recent Advances to Overcome Barriers in the Treatment of Water Aquatic Pollution Atmospheric Protection/Air Quality Control/Air Pollution Chemical compounds Chemical oxygen demand Design of experiments Earth and Environmental Science Ecotoxicology Effluents Environment Environmental Chemistry Environmental Health Environmental science Industrial Waste - analysis Oxidation Phenols Photocatalysis Photolysis Potassium Studies Titanium Trinitrotoluene - analysis Trinitrotoluene - chemistry Trinitrotoluene - radiation effects Waste Water - chemistry Waste Water Technology Wastewater and Air Water Management Water Pollutants, Chemical - analysis Water Pollutants, Chemical - chemistry Water Pollutants, Chemical - radiation effects Water Pollution Control Water Purification - methods Water treatment
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Summary:	In trinitrotoluene (TNT) purification process, realized in industries, there are two washes carried out at the end of the procedure. The first is performed with vaporized water, from which the first effluent, called yellow water, is originated. Then, a second wash is performed using sodium sulfite, generating the red water effluent. The objective of this work was to get the best conditions for photocatalytic degradation of the second effluent, red water, in order to reduce toxicity and adjust legal parameters according to regulatory agencies for dumping these effluents into waterways. It has used a statistical evaluation for factor interaction (pH, concentration) that affects heterogeneous photocatalysis with titanium dioxide (TiO 2 ). Thus, the treatment applied in the factorial experimental design consisted of using a volume equal to 500 mL of the effluent to 0.1 % by batch treatment, which has changed TiO 2 pH and concentration, according to the design, with 20 min time for evaluation, where it was used as response to the reduction of UV–Vis absorption. According to the design responses, it has obtained optimum values for the parameters evaluated: pH = 6.5 and concentration of 100 mg/L of TiO 2 were shown to be efficient when applied to red water effluent, obtaining approximately 91 % of discoloration.
ISSN:	0944-1344 1614-7499