TY - JOUR
T1 - Enhanced biological stabilization of heavy metals in sediment using immobilized sulfate reducing bacteria beads with inner cohesive nutrient
AU - Li, Xin
AU - Dai, Lihua
AU - Zhang, Chang
AU - Zeng, Guangming
AU - Liu, Yunguo
AU - Zhou, Chen
AU - Xu, Weihua
AU - Wu, Youe
AU - Tang, Xinquan
AU - Liu, Wei
AU - Lan, Shiming
N1 - Funding Information:
This work was jointly supported by the National Science Foundation of China ( 51521006 , 51579097 ), the principle of electrical chemical enhancement of Thiobacillus ferrooxidans bacterial ex-situ bioremediation of heavy metal contaminated sediment( 51579097 ), and Lake contamination and wetland remediation ( 51521006 ).
Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2017/2/15
Y1 - 2017/2/15
N2 - A series of experiments were conducted for treating heavy metals contaminated sediments sampled from Xiangjiang River, which combined polyvinyl alcohol (PVA) and immobilized sulfate reducing bacteria (SRB) into beads. The sodium lactate was served as the inner cohesive nutrient. Coupling the activity of the SRB with PVA, along with the porous structure and huge specific surface area, provided a convenient channel for the transmission of matter and protected the cells against the toxicity of metals. This paper systematically investigated the stability of Cu, Zn, Pb and Cd and its mechanisms. The results revealed the performance of leaching toxicity was lower and the removal efficiencies of Cu, Zn, Pb and Cd were 76.3%, 95.6%, 100% and 91.2%, respectively. Recycling experiments showed the beads could be reused 5 times with superbly efficiency. These results were also confirmed by continuous extraction at the optimal conditions. Furthermore, X-ray diffraction (XRD) and energy-dispersive spectra (EDS) analysis indicated the heavy metals could be transformed into stable crystal texture. The stabilization of heavy metals was attributed to the carbonyl and acyl amino groups. Results presented that immobilized bacteria with inner nutrient were potentially and practically applied to multi-heavy-metal-contamination sediment.
AB - A series of experiments were conducted for treating heavy metals contaminated sediments sampled from Xiangjiang River, which combined polyvinyl alcohol (PVA) and immobilized sulfate reducing bacteria (SRB) into beads. The sodium lactate was served as the inner cohesive nutrient. Coupling the activity of the SRB with PVA, along with the porous structure and huge specific surface area, provided a convenient channel for the transmission of matter and protected the cells against the toxicity of metals. This paper systematically investigated the stability of Cu, Zn, Pb and Cd and its mechanisms. The results revealed the performance of leaching toxicity was lower and the removal efficiencies of Cu, Zn, Pb and Cd were 76.3%, 95.6%, 100% and 91.2%, respectively. Recycling experiments showed the beads could be reused 5 times with superbly efficiency. These results were also confirmed by continuous extraction at the optimal conditions. Furthermore, X-ray diffraction (XRD) and energy-dispersive spectra (EDS) analysis indicated the heavy metals could be transformed into stable crystal texture. The stabilization of heavy metals was attributed to the carbonyl and acyl amino groups. Results presented that immobilized bacteria with inner nutrient were potentially and practically applied to multi-heavy-metal-contamination sediment.
KW - Heavy metal contamination
KW - Inner nutrient
KW - Sediment
KW - Stability
KW - Toxicity
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U2 - 10.1016/j.jhazmat.2016.10.067
DO - 10.1016/j.jhazmat.2016.10.067
M3 - Article
C2 - 27832908
AN - SCOPUS:85003467495
SN - 0304-3894
VL - 324
SP - 340
EP - 347
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
ER -