Degradation of phthalic acid esters (PAEs) by an enzyme mimic and its application in the degradation of intracellular DEHP

Experimental data from a study using a landfill simulation reactor were used to develop and calibrate a one-dimensional distributed model of co-digestion of municipal solid waste and three phthalic acid diesters with different water solubilities. The three diesters were diethyl phthalate, dibutyl phthalate, and di-2-ethylhexyl phthalate. Two types of municipal solid wastes were assumed, easily degradable and recalcitrant. The model considered inhibition of hydrolysis of the recalcitrant fraction and phthalic acid esters, and also methanogenesis at acidic pH. The results indicated that the prolonged steady-state concentrations of the diesters in the leachates could be explained by equilibrium between physicochemical desorption and sorption processes for the three diesters. When methanogenic conditions were induced in the acidogenic landfill simulation reactor, inhibition of both hydrolysis of recalcitrant MSW and of phthalic acid esters ceased.

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Enzymatic hydrolysis of structurally diverse phthalic acid esters by porcine and bovine pancreatic cholesterol esterases

Chemosphere ◽

10.1016/j.chemosphere.2010.08.020 ◽

2010 ◽

Vol 81 (11) ◽

pp. 1544-1548 ◽

Cited By ~ 16

Author(s):

Takao Saito ◽

Peng Hong ◽

Rima Tanabe ◽

Kazuo Nagai ◽

Katsuya Kato

Keyword(s):

Enzymatic Hydrolysis ◽

Phthalic Acid ◽

Phthalic Acid Esters ◽

Hydrolysis Of ◽

Acid Esters

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Determination of phthalic acid esters in imitation jewellery and investigation of their migration risk

Chinese Journal of Chromatography ◽

10.3724/sp.j.1123.2012.03013 ◽

2013 ◽

Vol 30 (7) ◽

pp. 647-653 ◽

Cited By ~ 2

Author(s):

Ying LAI ◽

Zongping HUANG ◽

Xiuxiu GE ◽

Rui LIN ◽

Hexiu CHEN

Keyword(s):

Phthalic Acid ◽

Phthalic Acid Esters ◽

Acid Esters

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Chemodynamics, transport behaviour and treatment of phthalic acid esters in municipal landfill leachates

Water Science & Technology ◽

10.2166/wst.1998.0135 ◽

1998 ◽

Vol 38 (2) ◽

pp. 185-192 ◽

Cited By ~ 24

Author(s):

M. J. Bauer ◽

R. Herrmann ◽

A. Martin ◽

H. Zellmann

Keyword(s):

Particulate Matter ◽

Aquatic Environment ◽

Phthalic Acid ◽

Phthalic Acid Esters ◽

Landfill Leachates ◽

Transport Behaviour ◽

Ethylhexyl Phthalate ◽

Dissolved Phase ◽

Acid Esters ◽

Long Chain

Large amounts of phthalic acid esters (PAEs) are leached from plastics dumped at municipal landfills. This leachate transports PAEs either adsorbed on particulate matter or in dissolved phase. Dissolved organic macromolecules, mainly humic-like substances, enhance the solubility of PAEs. In the biochemical environments of municipal landfills short chain PAEs can be degraded by base-catalyzed hydrolysis or by microorganisms which enzymatically split the side chains. However, there is no cleavage of the aromatic ring. Long chain PAEs like di-(2-ethylhexyl) phthalate are neither degraded abiotically nor by microorganisms. Hence, these PAEs can be leached and washed out of leaky landfills into the groundwater and thus continue to be a threat to the aquatic environment. Only a combined UV radiation/ozonation treatment is capable of fully destroying PAEs.

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