Study on Biodegradation of Di(2-Ethylhexyl)Phthalate

摘要

Di(2-ethylhexyl)phthalate(DEHP) is a typical kind of Phthalic acid esters (PAEs) with high production, serious toxicity and uneasy degradation characteristics. DEHP is widely used industrial chemicals, serving as important additives with impart flexibility in polyvinylchlride ( PVC) resins. DEHP is also used to vary degree in resins such as polycinyl acetates, cellulosics, polyurethanes, and is produced in very large quantities. DEHP has received extensive attention in recent years due to its wide spread use and ubiquity in the environment. It is widely distributed in air, sediment, natural water, waste water, soil and living organics. Research suggests that metabolic breakdown of DEHP by microorganism is considered to be one of the major path of environment degradation for these widespread pollutants due to their low rate of the hydrolysis and photolysis. DEHP is degraded by a wide range of bacteria under both aerobic and anaerobic conditions in natural circumstance, but the natural degrading a-bility of bacteria cant be satisfied with the needs of DEHP treatment in environment, so its time to find out effective degrading bacteria to deal with it. Two DEHP-degrading bacteria strains were isolated from polluted environment u-sing the gradient pressure acclimatization technique, and its biodegradation was studied in this paper.