PMID- 38141349
OWN - NLM
STAT- MEDLINE
DCOM- 20240115
LR  - 20240115
IS  - 1095-8630 (Electronic)
IS  - 0301-4797 (Linking)
VI  - 351
DP  - 2024 Feb
TI  - Immobilization of Cd(2+) in an aqueous environment using a two-step 
      microbial-induced carbonate precipitation method.
PG  - 119868
LID - S0301-4797(23)02656-7 [pii]
LID - 10.1016/j.jenvman.2023.119868 [doi]
AB  - Previous researches indicate that the potent toxicity of cadmium hinders the 
      efficacy of the microbial-induced carbonate precipitation (MICP) process for 
      bioremediation of Cd(2+) in aqueous environment. Increasing urea and calcium 
      resource doses, introducing synergists, and utilizing urease-producing consortia 
      can improve bio-immobilization performance of MICP. However, such measures may 
      incur cost increases and/or secondary contamination. This study first verifies 
      the substantial biotoxicity of Cd(2+) for urease activity and then analyzes the 
      practical limitation of traditional MICP using Bacillus pasteurii for 
      bioremediation of Cd(2+) in an aqueous environment containing 1-40 mM Cd(2+) by a 
      series tube tests and numerical simulation. Subsequently, a two-step MICP method, 
      which separates urea hydrolysis and heavy metal precipitation, is introduced in 
      this study to eliminate the inhibitory effect of heavy metal on urease activity. 
      The concentrations of ammonium, Cd(2+), and pH were monitored over time. The 
      results indicate that the urease expression in B. pasteurii can be significantly 
      inhibited by Cd(2+) particularly at the concentration ranging from 10 to 40 mM, 
      leading to pretty low efficacy of traditional MICP for bioremediation of Cd(2+) 
      (Cd(2+) removal rate as low as 21.55-38.47% when the initial Cd(2+) 
      concentration = 40 mM). In contrast, when the two-step MICP method is applied, 
      the Cd(2+) can be almost completely immobilized, even though the concentration 
      ratio of urea to Cd(2+) is as low as 1.5:1.0, which is close to the theory 
      minimum concentration ratio for the complete precipitation of carbonate to 
      cadmium ions(1.0:1.0). Therefore, the cost-effective, environmentally 
      sustainable, and straightforward two-step MICP method holds great potential for 
      application in the bioremediation of Cd(2+)-contaminated solutions in high 
      concentration.
CI  - Copyright (c) 2023 Elsevier Ltd. All rights reserved.
FAU - Huang, Xiaosong
AU  - Huang X
AD  - School of Civil Engineering, Wuhan University, Wuhan, 430072, Hubei, China.
FAU - Zhang, Rongjun
AU  - Zhang R
AD  - School of Civil Engineering, Wuhan University, Wuhan, 430072, Hubei, China; State 
      Key Laboratory of Water Resources Engineering and Management, Wuhan University, 
      Wuhan, 430072, Hubei, China; Key Laboratory of Rock Mechanics in Hydraulic 
      Structural Engineering of the Ministry of Education, Wuhan University, Wuhan, 
      430072, Hubei, China. Electronic address: ce_zhangrj@whu.edu.cn.
FAU - Xu, Yaodong
AU  - Xu Y
AD  - Institute of Geotechnical and Underground Engineering, Huazhong University of 
      Science and Technology, Wuhan, 430074, Hubei, China.
FAU - Zheng, Junjie
AU  - Zheng J
AD  - School of Civil Engineering, Wuhan University, Wuhan, 430072, Hubei, China.
LA  - eng
PT  - Journal Article
DEP - 20231222
PL  - England
TA  - J Environ Manage
JT  - Journal of environmental management
JID - 0401664
RN  - 00BH33GNGH (Cadmium)
RN  - H0G9379FGK (Calcium Carbonate)
RN  - EC 3.5.1.5 (Urease)
RN  - 0 (Carbonates)
RN  - 0 (Metals, Heavy)
RN  - 8W8T17847W (Urea)
RN  - 059QF0KO0R (Water)
SB  - IM
MH  - *Cadmium
MH  - Calcium Carbonate
MH  - Urease
MH  - Carbonates
MH  - *Metals, Heavy
MH  - Urea
MH  - Water
MH  - Chemical Precipitation
OTO - NOTNLM
OT  - Bacillus pasteurii
OT  - Bioremediation
OT  - Cd(2+)-contaminated solution
OT  - Concentration ratio
OT  - Microbial-induced carbonate precipitation (MICP)
OT  - Removal rate
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- 2023/12/24 09:42
MHDA- 2024/01/15 12:43
CRDT- 2023/12/23 18:03
PHST- 2023/09/26 00:00 [received]
PHST- 2023/11/28 00:00 [revised]
PHST- 2023/12/13 00:00 [accepted]
PHST- 2024/01/15 12:43 [medline]
PHST- 2023/12/24 09:42 [pubmed]
PHST- 2023/12/23 18:03 [entrez]
AID - S0301-4797(23)02656-7 [pii]
AID - 10.1016/j.jenvman.2023.119868 [doi]
PST - ppublish
SO  - J Environ Manage. 2024 Feb;351:119868. doi: 10.1016/j.jenvman.2023.119868. Epub 
      2023 Dec 22.