TY - JOUR
T1 - A potential sustainable technique to entrap contaminants against rill erosion based on MICP
AU - Naeimi, Maryam
AU - Khodadadi Tirkolaei, Hamed
AU - Cheng, Liang
AU - Boromand, Zohreh
N1 - Funding Information:
This paper was extracted from the project entitled “Studying the Feasibility of using Modern Technologies based on Geopolymer in Dust Control of Critical Foci“ with the number of “2-09-09-085-000731“funded by the Research Institute of Forests and Rangelands (RIFR). The authors express the gratitude to the head of the desert research division at the RIFR, Dr Mohammad Khosroshahi, for the unconditional support. Additionally, the paper was completed with the contribution of Applied Research Center of Geology and Mineral Exploration Organization of Iran on the SEM-EDS and ICP analyzing, and the Arizona State university and Jiangsu University for completing discussion part and editing the manuscript.
Publisher Copyright:
© 2023 Elsevier B.V.
PY - 2023/12
Y1 - 2023/12
N2 - Health risks due to toxic metals (TM) contamination is a global concern. Toxic metals could be release to the environment due to soil erosion. The present study was aimed to prove the synergistic mechanisms of microbially induced calcium carbonate precipitation (MICP) on improving the strength properties of soil particles toward rill erosion, as well as immobilizing toxic metals into stable crystals. Hence, laboratory batch studies were conducted to evaluate the rill erosion stability as well as Cd, Pb and Zn removal ability based on bioprecipitation through MICP, using urease producing bacteria. Results revealed that the application of the strain Bacillus pasteurii PTCC1645 in MICP process of test model treated with 500 mM cementation solution showed a great potential to decrease sand lost to below 20% with the flow rate of 15 ml/min with highest strength (131 KPa) and the highest calcium carbonate content (0.84%). Moreover, the immobilization of the toxic metals in biotreated test models above 50 mM under the flow rate of 3 ml/min showed the efficiency of Pb, Zn and Cd ions by 100%. SEM proved the presence of calcite among the sand particles which could be attributed to the effectiveness of the strain. Energy-dispersive X-ray spectroscopy (EDS) analysis revealed the presence of toxic metals, while were transformed into carbonates by MICP of PTCC1645. Hence, toxic metals have stronger stability encountered with rill erosion and low toxicity compared with metal ions. The present study illustrated that the carbonate-biomineralization can offer an effective and eco-friendly approach to immobilize soluble toxic metals and that MICP may play an important role in metal bioconservation during rill erosion.
AB - Health risks due to toxic metals (TM) contamination is a global concern. Toxic metals could be release to the environment due to soil erosion. The present study was aimed to prove the synergistic mechanisms of microbially induced calcium carbonate precipitation (MICP) on improving the strength properties of soil particles toward rill erosion, as well as immobilizing toxic metals into stable crystals. Hence, laboratory batch studies were conducted to evaluate the rill erosion stability as well as Cd, Pb and Zn removal ability based on bioprecipitation through MICP, using urease producing bacteria. Results revealed that the application of the strain Bacillus pasteurii PTCC1645 in MICP process of test model treated with 500 mM cementation solution showed a great potential to decrease sand lost to below 20% with the flow rate of 15 ml/min with highest strength (131 KPa) and the highest calcium carbonate content (0.84%). Moreover, the immobilization of the toxic metals in biotreated test models above 50 mM under the flow rate of 3 ml/min showed the efficiency of Pb, Zn and Cd ions by 100%. SEM proved the presence of calcite among the sand particles which could be attributed to the effectiveness of the strain. Energy-dispersive X-ray spectroscopy (EDS) analysis revealed the presence of toxic metals, while were transformed into carbonates by MICP of PTCC1645. Hence, toxic metals have stronger stability encountered with rill erosion and low toxicity compared with metal ions. The present study illustrated that the carbonate-biomineralization can offer an effective and eco-friendly approach to immobilize soluble toxic metals and that MICP may play an important role in metal bioconservation during rill erosion.
KW - Contamination
KW - Entrap
KW - MICP
KW - Rill erosion
KW - Toxic metals
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U2 - 10.1016/j.enmm.2023.100844
DO - 10.1016/j.enmm.2023.100844
M3 - Article
AN - SCOPUS:85163550459
SN - 2215-1532
VL - 20
JO - Environmental Nanotechnology, Monitoring and Management
JF - Environmental Nanotechnology, Monitoring and Management
M1 - 100844
ER -