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Plasticizers are low volatility compounds that offer flexibility and processability to resins. The phthalates and adipates, used as plasticizers, have low water solubility e high partition octanol/water (Kow) and accumulate in soil and sediments. These compounds are considered teratogenics, carcinogenics and as endocrine disruptors. This study evaluated the bioremediation of a tropical soil contaminated with process plasticizers wastes, under aerobic conditions, with and without introduction of acclimated bacteria. The compounds evaluated were: Di-butylphthalate, Di-n-butylphthalate, Bis(2ethylhexyl)phthalate, Di-decylphthalate, Di-amylphthalate and Di-octyladipate. Previous studies were done and showed that aerobic degradation was possible: pH from 5,5 to 7,81, temperature from 17 to 30 C, moisture from 35 to 71 %, sludge addition from 5 to 11 gSSV/kg soil, carbon-nitrogen rate 60:1 and carbon-phosphorus rate 300:1. After geological analysis of soil, considering ten different points on the factory area, it was selected the soil for biodegradation of eight points, representing 1 mg plasticizers/kg soil to 2371 mg plasticizers/kg soil. Mineralogical, physical and chemical analysis were done according to EMBRAPA, CETESB and Environmental Protection Agency recomendations. Plasticizers contents in soil varied from 1 to 723 mg/kg and after 120 days of biodegradation in eight aerobic reactors, the removal efficiencies were above 50%. The fingerprint analysis showed that the bacteria present in reactors, at the end of the tests, were originated from soil and sludge and the CG/MS analysis identified the metabolic Monoethilhexylphthalate, besides others sub-products and final products of biodegradation.

Biorremediação de solo tropical contaminado com resíduos da produção de plastificantes.