PMID- 36113657
OWN - NLM
STAT- MEDLINE
DCOM- 20221013
LR  - 20221013
IS  - 1879-1298 (Electronic)
IS  - 0045-6535 (Linking)
VI  - 308
IP  - Pt 2
DP  - 2022 Dec
TI  - Synergistic solidification of lead-contaminated soil by magnesium oxide and 
      microorganisms.
PG  - 136422
LID - S0045-6535(22)02915-0 [pii]
LID - 10.1016/j.chemosphere.2022.136422 [doi]
AB  - Although microbially induced carbonate precipitation (MICP) technology 
      effectively promotes the remediation of heavy metal contaminated soils in low 
      concentrations, the high concentration of heavy metals has a toxic effect on 
      microorganisms, which leads to the decline of carbonate yield and makes the soil 
      strength and environmental safety after remediation no up to the standard. This 
      study describes the synergistic curing effect of MgO and microorganisms on soil 
      contaminated with high concentrations of heavy metals. The experimental results 
      with MgO showed 2-6 times increase in unconfined compressive strength (UCS) 
      compared to bio-cemented samples without MgO. Toxicity characteristic leaching 
      procedure experiments indicated that Pb-contaminated soil at 10,000 mg/kg with 
      quantitative MgO for synergistic solidification could meet the international 
      solid waste disposal standards, which leachable Pb(2+) are less than 5 mg/L. In 
      addition, the microscopic results showed that the introduction of MgO promoted 
      the formation of magnesium calcite and dolomite, improved the solidification 
      efficiency of heavy metal contaminants, and demonstrated the presence of Pb(2+) 
      in carbonate minerals. This study suggests that MgO and microorganisms have broad 
      application prospects for synergistic solidification of Pb(2+) soil.
CI  - Copyright (c) 2022. Published by Elsevier Ltd.
FAU - Zha, Fusheng
AU  - Zha F
AD  - School of Resource and Environmental Engineering, Hefei University of Technology, 
      Hefei, 230009, China.
FAU - Chen, Shaogeng
AU  - Chen S
AD  - School of Resource and Environmental Engineering, Hefei University of Technology, 
      Hefei, 230009, China.
FAU - Kang, Bo
AU  - Kang B
AD  - School of Resource and Environmental Engineering, Hefei University of Technology, 
      Hefei, 230009, China. Electronic address: kangbo@hfut.edu.cn.
FAU - Xu, Long
AU  - Xu L
AD  - School of Resource and Environmental Engineering, Hefei University of Technology, 
      Hefei, 230009, China.
FAU - Shen, Yinbin
AU  - Shen Y
AD  - China Jikan Research Institute of Engineering Investigations and Design, Co., 
      Ltd, Xi'an, 710043, China.
FAU - Wang, Runkai
AU  - Wang R
AD  - School of Resource and Environmental Engineering, Hefei University of Technology, 
      Hefei, 230009, China.
LA  - eng
PT  - Journal Article
DEP - 20220913
PL  - England
TA  - Chemosphere
JT  - Chemosphere
JID - 0320657
RN  - 0 (Metals, Heavy)
RN  - 0 (Soil)
RN  - 0 (Soil Pollutants)
RN  - 2P299V784P (Lead)
RN  - 3A3U0GI71G (Magnesium Oxide)
RN  - H0G9379FGK (Calcium Carbonate)
RN  - I38ZP9992A (Magnesium)
SB  - IM
MH  - Calcium Carbonate
MH  - Lead
MH  - Magnesium
MH  - Magnesium Oxide
MH  - *Metals, Heavy/analysis
MH  - Soil
MH  - *Soil Pollutants/analysis
OTO - NOTNLM
OT  - Dolomite
OT  - Lead-contaminated soil
OT  - Magnesium oxide
OT  - Microbially induced carbonate precipitation (MICP)
OT  - Synergistic solidification
COIS- Declaration of competing interest The authors declare that they have no known 
      competing financial interests or personal relationships that could have appeared 
      to influence the work reported in this paper.
EDAT- 2022/09/17 06:00
MHDA- 2022/10/14 06:00
CRDT- 2022/09/16 19:24
PHST- 2022/08/01 00:00 [received]
PHST- 2022/08/30 00:00 [revised]
PHST- 2022/09/08 00:00 [accepted]
PHST- 2022/09/17 06:00 [pubmed]
PHST- 2022/10/14 06:00 [medline]
PHST- 2022/09/16 19:24 [entrez]
AID - S0045-6535(22)02915-0 [pii]
AID - 10.1016/j.chemosphere.2022.136422 [doi]
PST - ppublish
SO  - Chemosphere. 2022 Dec;308(Pt 2):136422. doi: 10.1016/j.chemosphere.2022.136422. 
      Epub 2022 Sep 13.