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Ecotoxicol Environ Saf. 2017 Jan;135:158-164. doi: 10.1016/j.ecoenv.2016.09.021. Epub 2016 Oct 10.

Effects of root exudates on gel-beads/reeds combination remediation of high molecular weight polycyclic aromatic hydrocarbons.

Author information

1
College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, PR China; Key Laboratory of Marine Environment and Ecology, Ministry of Education, Qingdao 266100, PR China. Electronic address: weijunas@ouc.edu.cn.
2
College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, PR China.

Abstract

Changes in root exudates, including low molecular weight organic acids (LMWOAs), amino acids and sugars, in rhizosphere soils during the gel-beads/reeds combination remediation for high molecular weight polycyclic aromatic hydrocarbons (HMW-PAHs) and the degree of the effects on HMW-PAH biodegradation were evaluated in this study. The results showed that the gel-beads/reeds combination remediation notably increased the removal rates of pyrene, benzo(a)pyrene and indeno(1,2,3-cd)pyrene (65.0-68.9%, 60.0-68.5% and 85.2-85.9%, respectively). During the removal of HMW-PAHs, the LMWOAs, particularly maleic acid, enhanced the biodegradation of HMW-PAHs. Arginine and trehalose monitored in reed root exudates promoted the growth of plants and microorganisms and then improved the removal of HMW-PAHs, especially pyrene. However, the contribution of reed root exudates on degradation of 5- and 6-ring PAHs was minor. These results indicated that the utilization of root exudates was certainly not the only important trait for the removal of HMW-PAHs.

KEYWORDS:

Arginine; Gel-beads; High molecular weight polycyclic aromatic hydrocarbons (HMWPAHs); Low molecular weight organic acids (LMWOAs); Reed; Trehalose

PMID:
27736675
DOI:
10.1016/j.ecoenv.2016.09.021
[Indexed for MEDLINE]

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