Bioremediation of Pb-contaminated soil by incubating with Phanerochaete chrysosporium and straw.
The bioremediation of the simulated lead (Pb)-contaminated soils by incubating with Phanerochaete chrysosporium and straw was studied at laboratory-scale. The soil pH, Pb concentration, soil microbial biomass, microbial metabolic quotient, microbial quotient and microbial biomass C-to-N ratios were monitored. The above indicators were to study the stress of Pb on soil and the microbial effects during the bioremediation process. It was found that the soils treated with P. chrysosporium and straw showed a much lower concentration of soluble-exchangeable Pb, lower metabolic quotient and biomass C-to-N ratios (0mgkg(-1) dry weight soil, 1.9mg CO(2)-Cmg(-1) biomass carbon and 4.9 on day 60, respectively) and higher microbial biomass and microbial quotient (2258mgkg(-1) dry weight soil and 7.86% on day 60, respectively) compared with the controls. In addition, the kinetic parameters in the model based on logistic equation were calculated by the BIOLOG data. By analyzing those kinetic parameters some information on the metabolic capacity of the microbial community could be obtained. All the results indicated that the bioavailability of Pb in contaminated soil was reduced so that the potential stress of Pb was alleviated, and also showed that the soil microbial effects and the metabolic capacity of microbial community were improved.
Huang
Dan-Lian
DL
College of Environmental Science and Engineering, Hunan University, Changsha 410082, Hunan, China.
Zeng
Guang-Ming
GM
Jiang
Xiao-Yun
XY
Feng
Chong-Ling
CL
Yu
Hong-Yan
HY
Huang
Guo-He
GH
Liu
Hong-Liang
HL
D003116:Color; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D007854:Lead / Q000378:metabolism*; D020075:Phanerochaete / Q000378:metabolism*; D018520:Plant Shoots; D012988:Soil Microbiology; D012989:Soil Pollutants; D014908:Triticum
D012989:Soil Pollutants; D007854:Lead