Biodegradação de alcoóis, ftalatos e adipatos em um solo tropical contaminado

Ex-situ bioremediation of Brazilian soil contaminated with plasticizers process wastes

“…The original soil had higher concentrations of pollutants than those found in the slurry, confirming the possible acid catalyzed plasticizers hydrolysis after initial addition of water and sludge, a result corroborated by Ferreira and Morita (2010).…”

“…Isobutyl alcohol showed the same initial concentration during 60 days after the start of bioremediation, demonstrating that it became bioavailable after phthalate removal in the plasticized soil. The decrease of this short alkyl chain alcohol content could not be totally attributed to volatilization, as demonstrated by Ferreira and Morita (2010). Concerning the long alkyl chain alcohols, 2-ethyl hexanol was identified at the beginning of the experiment and after 30 days in concentrations of 14 mg kg -1 dry soil and was not detected after this period.…”

“…The profile obtained from the bands suggests that, after 100 days, the community is actually composed of several dominant populations from the soil, with 60% similarity to the indigenous microorganism bands and some dominant population from the inoculum, with 20% similarity to the acclimated microorganism bands. Despite the low similarity with respect to the dominant population bands of the inoculum, early studies developed by Ferreira and Morita (2010) showed no removal efficiency of soil pollutants without the addition of acclimated microorganisms to a plasticizer biodegrading reactor at the initial time. Chatterjee and Dutta (2003), Gu et al (2005) and Li et al (2005) have demonstrated that the complete degradation of phthalates is always performed syntrophically by several types of microorganisms.…”

“…The bioremediation test was conducted in accordance with the best results obtained in early studies developed on a bench scale (Ferreira and Morita, 2010) and the biodegradation of pollutants present in real contaminated soil occurred by indigenous and acclimated microorganisms from the sludge of the wastewater treatment plant of the plasticizers industry.…”