Abstract
The electrolytic treatment of a real industrial effluent and simulated wastewater containing the 1,2-dihydro- 2,2,4-trimethylquinoleyn compound (Naugard Q®) had been investigated in order to improve the wastewater biodegradability. The electrolysis was carried out in a batch electrolytic cell using 70TiO2/30RuO2 electrodes (DSA® anode). After electrochemical treatment, wastewaters were evaluated in terms of Naugard Q® concentration, UV-visible spectrophotometry and biodegradation. Further analyses were conducted in simulated wastewater by gas chromatography and the biodegradation process was monitored using respirometric flasks. Both real effluent and simulated wastewater presented a decrease in Naugard Q® concentration. The simulated wastewater electrolytic treatment provided concentration reduction of Naugard Q® about 52.04% after 60 min, whereas real effluent concentration was reduced by 62.60% after 40 minutes. Furthermore, UV-visible spectra and gas chromatograms presented significant alterations in molecular structure of the compound. After 30 min electrolysis, an increase in simulated wastewater biodegradation was observed. In real effluent, the biodegradation response was faster, as more CO2 was produced in assays that underwent 10 and 25 minutes of electrolytic treatment. This result is probably related to modifications in Naugard Q® molecular structure. It was concluded that the electrolytic treatment followed by bioremediation could be an alternate treatment to degrade this compound.
Highlights
The Naugard Q® compound (1,2-dihydro-2,2,4-trimethylquinoleyn) is an aromatic amine which can be found in toxic effluents from rubber antioxidant and antiozonant chemical industry located in Rio Claro (Sao Paulo, Brazil)
Simulated wastewater: Analysis of the simulated wastewater after the electrolytic treatment showed that pH values gradually decreased from 5.7 to 3.8 along electrolysis time increase, probably due to solvent breakdown and alterations on Naugard Q® compound molecular structure, resulting in H+ production
Naugard Q® concentration decreased after electrolytic treatments in both simulated wastewater and real effluent
Summary
The Naugard Q® compound (1,2-dihydro-2,2,4-trimethylquinoleyn) is an aromatic amine which can be found in toxic effluents from rubber antioxidant and antiozonant chemical industry located in Rio Claro (Sao Paulo, Brazil). This compound was chosen mainly because it is one of the most important persistent compounds present in effluents from Brazilian chemical industries [1]. Wastewater containing aromatic compounds is both recalcitrant and toxic towards microorganisms during conventional biological treatment In this context, electrochemical treatment can be a powerful tool in environmental complex matrixes degradation [5,6,7,8]
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