Role of cosubstrate and bioaccessibility played in the enhanced anaerobic biodegradation of organochlorine pesticides (OCPs) in a paddy soil by nitrate and methyl...
Publication Date
2014-07-01Author
Ye, Mao
Sun, Mingming
Ni, Ni
Chen, Yinwen
Liu, Zongtang
Gu, Chengang
Bian, Yongrong
Hu, Feng
Li, Huixin
Kengara, Fredrick O
Jiang, Xin
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Abstract The present study was conducted to investigate the anaerobic biodegradation
potential of biostimulation by nitrate (KNO 3) and methyl-β-cyclodextrin (MCD) addition on
an aged organochlorine pesticide (OCP)-contaminated paddy soil. After 180 days of
incubation, total OCP biodegradation was highest in soil receiving the addition of nitrate and
MCD simultaneously and then followed by nitrate addition, MCD addition, and control. The
highest biodegradation of chlordanes, hexachlorocyclohexanes, endosulfans, and total
OCPs was 74.3, 63.5, 51.2, and 65.1%, respectively. Meanwhile, MCD addition significantly
increased OCP bioaccessibility (p< 0.05) evaluated by Tenax TA extraction and a three-
compartment model method. Moreover, the addition of nitrate and MCD also obtained the
highest values of soil microbial activities, including soil microbial biomass carbon and …
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- Department of Chemistry [326]