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Biodegradation of phthalate esters in compost-amended soil
1Department of Microbiology, Soochow University, Shih Lin, Taipei 111, Taiwan. bvchang@mail.scu.edu.tw
Chemosphere
|November 26, 2008
Summary
Compost addition and specific conditions enhance phthalate acid ester (PAE) biodegradation in soil. Smaller compost particle sizes showed higher degradation rates in compost alone, but this effect diminished when compost was added to soil.
Area of Science:
- Environmental Science
- Soil Science
- Bioremediation
Background:
- Phthalate acid esters (PAEs) like DBP and DEHP are common pollutants.
- Understanding their biodegradation in soil and compost is crucial for environmental remediation.
Purpose of the Study:
- To investigate the biodegradation of di-n-butyl phthalate (DBP) and di-(2-ethyl hexyl) phthalate (DEHP) in compost and compost-amended soil.
- To determine optimal conditions and the role of compost properties in PAE degradation.
Main Methods:
- PAEs (DBP and DEHP) were added to straw and animal manure composts and then to soil.
- Biodegradation rates were assessed under varying pH, temperature, and compost particle sizes.
- Compost fractions were analyzed for their impact on PAE degradation in both compost and soil.
Main Results:
- Optimal PAE degradation occurred at pH 7 and 30°C.
- Simultaneous presence of DBP and DEHP enhanced degradation.
- Addition of either compost type improved PAE degradation rates.
- Smaller compost particle sizes exhibited higher degradation rates within compost alone.
Conclusions:
- Compost application and favorable environmental conditions significantly enhance PAE biodegradation in soil.
- Compost properties, particularly particle size, influence degradation rates, though this effect is less pronounced in amended soil.
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