TY - JOUR
ID -
TI - Anoxic biodegradation of dimethyl phthalate (DMP) by activated sludge
cultures under nitrate-reducing conditions
AU - WU Dong-lei
AU - HU Bao-lan
AU - ZHENG Ping and Qaisar Mahmood
VL - 19
IS - 10
PB -
SP - 1252
EP - 1256
PY -
JF - Journal of Environmental Sciences
JA - J. Environ. Sci.
UR - http://www.jesc.ac.cn/jesc_en/ch/reader/view_abstract.aspx?file_no=2007191017&flag=1
KW - biodegradation; dimethyl phthalate; phthalic acid; nitrate reduction; mineralization
AB - Worldwide extensive use of plasticized plastics has resulted in phthalates pollution in di erent environment. Nitrates from industry
and agriculture are also widely disseminated in the soils, natural waters and wastewaters. Dimethyl phthalate (DMP) biodegradation by
activated sludge cultures under nitrate-reducing conditions was investigated. Under one optimized condition, DMP was biodegraded
from 102.20 mg/L to undetectable level in 56 h under anoxic conditions and its reaction fitted well with the first-order kinetics. Using
the high-performance liquid chromatography (HPLC) and liquid chromatography mass spectrometry (LC-MS) analysis, mono-methyl
phthalate (MMP) and phthalic acid (PA) were detected as the major intermediates of DMP biodegradation. When combined with the
determination of chemical oxygen demand (CODCr) removal capacity and pH, DMP was found to be mineralized completely under
anoxic conditions. The biodegradation pathway was proposed as DMP ! MMP ! PA ! ... ! CO2 + H2O. The molar ratio of DMP
to nitrate consumed was found to be 9.0:1, which agrees well with the theoretical stoichiometric values of DMP biodegradation by
nitrate-reducing bacteria. The results of the non-linear simulation showed that the optimum pH and temperature for the degradation
were 7.56 and 31.4℃, respectively.
ER -