Biodegradation of aged polycyclic aromatic hydrocarbons in agricultural soil by Paracoccus sp. LXC combined with humic acid and spent mushroom substrate

被引：63
作者：
Liu, Xiuchu [1 ]
Ge, Wei [2 ]
Zhang, Xiaomei [1 ]
Chai, Chao [1 ]
Wu, Juan [1 ]
Xiang, Dan [1 ]
Chen, Xiaoyu [1 ]
机构：
[1] Qingdao Agr Univ, Qingdao Engn Res Ctr Rural Environm, Qingdao 266109, Shandong, Peoples R China
[2] Qingdao Agr Univ, Coll Life Sci, Qingdao 266109, Shandong, Peoples R China
来源：
JOURNAL OF HAZARDOUS MATERIALS | 2019年 / 379卷
关键词：
Paracoccus sp; Spent mushroom substrate; Humic acid; Polycyclic aromatic hydrocarbons; Bioremediation; PAHS-CONTAMINATED SOIL; AGARICUS-BISPORUS; POLLUTED SOIL; SEWAGE-SLUDGE; ENHANCED BIODEGRADATION; BACTERIAL COMMUNITY; ORGANIC-MATTER; DEGRADATION; BIOREMEDIATION; COMPOST;
D O I：
10.1016/j.jhazmat.2019.120820
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Paracoccus sp. LXC combined with humic acid (HA) and spent mushroom substrate (SMS) obtained from Auricularia auricular and Sarcomyxa edulis was tested for the remediation of agricultural soil contaminated with aged polycyclic aromatic hydrocarbons (PAHs). The biomass and diversity of bacteria and fungi and the soil enzyme activity were analyzed. PAH removal and dissipation kinetics were examined. The highest degradation rate of PAHs was 56.5% when soil was amended with Paracoccus sp. LXC combined with HA and unsterilized SMS from A. auricular. The half-life of PAHs decreased from 2323.3 days in natural attenuation to 66.6-277.2 days in amended treatments. Soil treated with Paracoccus sp. LXC combined with HA and SMS from A. auricular acquired high contents of organic matter and nutrients. HA and SMS aided the growth of PAH-degrading bacteria and promoted the diversity of bacteria but not of fungi. The degradation rate of PAHs was mainly correlated positively with soil laccase activity. Low- and middle-molecular-weight PAHs were significantly removed by Paracoccus sp. LXC, HA and SMS. High-molecular-weight PAHs were removed by SMS but not by Paracoccus sp. LXC. Biodegradation by Paracoccus sp. LXC combined with HA and SMS is a promising choice for remediating aged PAH-contaminated agricultural soils.
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页数：10
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