PMID- 37343839
OWN - NLM
STAT- MEDLINE
DCOM- 20230808
LR  - 20230808
IS  - 1872-8359 (Electronic)
IS  - 0167-7012 (Linking)
VI  - 211
DP  - 2023 Aug
TI  - Factors affecting soil treatment with the microbially induced carbonate 
      precipitation technique and its optimization.
PG  - 106771
LID - S0167-7012(23)00105-7 [pii]
LID - 10.1016/j.mimet.2023.106771 [doi]
AB  - The microbially induced carbonate precipitation (MICP) technique has been used to 
      increase mechanical strength, reduce permeability, and fix radionuclides of 
      soils, etc. To achieve effective soil cementation by MICP, 3 aspects should be 
      considered: MICP efficiency, bacterium retention (in soils after injections), and 
      precipitation uniformity. Here, experiments and statistical analyses were 
      conducted to understand the parameters affecting the 3 aspects. Moreover, the 
      parameters leading to better performance in these aspects were designed and used 
      to conduct MICP soil cementation with varying the number of injections. The 
      results present that temperature and OD600nm of bacterial suspension are the most 
      important parameters affecting MICP efficiency, followed by reaction time, pH, 
      and concentration of cementation solution, and they are all statistically 
      significant. As these parameters increased, MICP efficiency (ratio of CaCO(3) 
      formed to Ca(2+) added) first increased quickly and then slowly or decreased. The 
      soil particle size distribution and injection rate affected bacterium retention 
      greatly. Smaller particle sizes, wider particle-size-distribution spans, and 
      slower injection rates are beneficial to bacterium retention. However, higher 
      injection rates favour precipitation uniformity. Finally, the unconfined 
      compressive strength (UCS) of the bio-treated soil can be increased further by 
      increasing the number of injections.
CI  - Copyright (c) 2023 Elsevier B.V. All rights reserved.
FAU - Su, Fei
AU  - Su F
AD  - State Key Laboratory of Silicate Materials for Architectures, Wuhan University of 
      Technology, Wuhan 430070, China; China Institute of Nuclear Industry Strategy, 
      Beijing 100045, China.
FAU - Wang, Yajian
AU  - Wang Y
AD  - State Key Laboratory of Silicate Materials for Architectures, Wuhan University of 
      Technology, Wuhan 430070, China; National Center for Materials Service Safety, 
      University of Science and Technology Beijing (USTB), Beijing 100083, China; 
      School of Engineering and Technology, China University of Geosciences (Beijing), 
      Beijing 100083, China. Electronic address: wangyj@ustb.edu.cn.
FAU - Liu, Yunqi
AU  - Liu Y
AD  - China Institute of Nuclear Industry Strategy, Beijing 100045, China.
FAU - Zhang, Jiaqi
AU  - Zhang J
AD  - China Institute of Nuclear Industry Strategy, Beijing 100045, China.
FAU - Liu, Xing
AU  - Liu X
AD  - China Institute of Nuclear Industry Strategy, Beijing 100045, China.
FAU - Zhang, Siyuan
AU  - Zhang S
AD  - China Institute of Nuclear Industry Strategy, Beijing 100045, China.
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20230619
PL  - Netherlands
TA  - J Microbiol Methods
JT  - Journal of microbiological methods
JID - 8306883
RN  - 0 (Soil)
RN  - H0G9379FGK (Calcium Carbonate)
RN  - 0 (Carbonates)
SB  - IM
MH  - *Soil
MH  - *Calcium Carbonate
MH  - Chemical Precipitation
MH  - Carbonates
MH  - Bacteria
OTO - NOTNLM
OT  - Bacterium retention
OT  - Injection rate
OT  - MICP efficiency
OT  - MICP soil cementation
OT  - Particle size distribution
OT  - Precipitation uniformity
COIS- Declaration of Competing Interest No conflict of interest was declared.
EDAT- 2023/06/22 01:07
MHDA- 2023/08/08 06:42
CRDT- 2023/06/21 19:17
PHST- 2022/11/15 00:00 [received]
PHST- 2023/06/13 00:00 [revised]
PHST- 2023/06/17 00:00 [accepted]
PHST- 2023/08/08 06:42 [medline]
PHST- 2023/06/22 01:07 [pubmed]
PHST- 2023/06/21 19:17 [entrez]
AID - S0167-7012(23)00105-7 [pii]
AID - 10.1016/j.mimet.2023.106771 [doi]
PST - ppublish
SO  - J Microbiol Methods. 2023 Aug;211:106771. doi: 10.1016/j.mimet.2023.106771. Epub 
      2023 Jun 19.