PMID- 36028130
OWN - NLM
STAT- MEDLINE
DCOM- 20221013
LR  - 20221013
IS  - 1879-1298 (Electronic)
IS  - 0045-6535 (Linking)
VI  - 308
IP  - Pt 1
DP  - 2022 Dec
TI  - Effect of microbially induced calcium carbonate precipitation treatment on the 
      solidification and stabilization of municipal solid waste incineration fly ash 
      (MSWI FA) - Based materials incorporated with metakaolin.
PG  - 136089
LID - S0045-6535(22)02582-6 [pii]
LID - 10.1016/j.chemosphere.2022.136089 [doi]
AB  - Microbially induced calcium carbonate precipitation (MICP) has been considered as 
      a potential treatment method for the solidification and stabilization of 
      municipal solid waste incineration fly ash (MSWI-FA).The main obstacle for MICP 
      treatment of MSWI-FA is the harsh environment which causes the bacteria fail to 
      maintain their urease activity effectively, thus decreases the solidification 
      effect and material properties. Currently, there is no research on blending 
      metakaolin (MK) as a protective carrier for the bacteria into the MSWI-FA. The 
      effect of the MICP process on the curing properties of MSWI FA-based cementing 
      materials in the MK and MSWI-FA reaction system is largely unknown. In this 
      study, different mixing ratios of MK were used to adjust the Ca/Si/Al ratio in 
      the mixture, and the properties of the cementing material (MSWI-FA mixed with MK 
      and water) and the MICP-treated material (MSWI-FA mixed with MK and bacterial 
      solution) were investigated. This study contributes to find suitable additives to 
      promote effect of MICP on the solidification of MSWI-FA and the improvement of 
      material properties. The results showed when the mixing ratio of MSWI FA was 
      90 wt %, the MICP treatment was able to increase the compressive strength of the 
      samples up to 0.99 Mp, and the compressive strength of samples reached 1.46 MPa, 
      when the mixing ratio of MSWI FA was 80 wt %. Though the metakaolin did not show 
      inhibitory effect on the urease activity, the compressive strength of the 
      MICP-treated samples did not further show a significant increase when the mixture 
      of MK was increased from 20 wt% to 30 wt%. Further investigation suggested that 
      MICP activities of bacteria utilizing calcium sources could have an impact on the 
      formation/deformation of calcium-containing hydration products in the reaction 
      system, thus affecting the mechanical and chemical properties of MSWI based 
      materials. MICP treatment is effective in the immobilization of certain heavy 
      metals of MSWI FA, especially for Pb, Cd and Zn. This research shows the 
      potential of using MICP to treat the MSWI fly ash, meanwhile, it is necessary to 
      find suitable reaction system with the proper additives in order to further 
      improve the properties of the MSWI FA based material in terms of mechanical 
      performance.
CI  - Copyright (c) 2022 Elsevier Ltd. All rights reserved.
FAU - Song, Mengzhu
AU  - Song M
AD  - School of Environment, Tsinghua University, Beijing, 100084, China.
FAU - Lan, Tian
AU  - Lan T
AD  - School of Environment, Tsinghua University, Beijing, 100084, China.
FAU - Meng, Yuan
AU  - Meng Y
AD  - School of Environment, Tsinghua University, Beijing, 100084, China.
FAU - Ju, Tongyao
AU  - Ju T
AD  - School of Environment, Tsinghua University, Beijing, 100084, China.
FAU - Chen, Zhehong
AU  - Chen Z
AD  - China Tiegong Investment & Construction Group Co., Ltd, China.
FAU - Shen, Pengfei
AU  - Shen P
AD  - China Tiegong Investment & Construction Group Co., Ltd, China.
FAU - Du, Yufeng
AU  - Du Y
AD  - School of Environment, Tsinghua University, Beijing, 100084, China.
FAU - Deng, Yongchi
AU  - Deng Y
AD  - China Tiegong Investment & Construction Group Co., Ltd, China.
FAU - Han, Siyu
AU  - Han S
AD  - School of Environment, Tsinghua University, Beijing, 100084, China.
FAU - Jiang, Jianguo
AU  - Jiang J
AD  - School of Environment, Tsinghua University, Beijing, 100084, China. Electronic 
      address: jianguoj@tsinghua.edu.cn.
LA  - eng
PT  - Journal Article
DEP - 20220823
PL  - England
TA  - Chemosphere
JT  - Chemosphere
JID - 0320657
RN  - 0 (Coal Ash)
RN  - 0 (Metals, Heavy)
RN  - 0 (Particulate Matter)
RN  - 0 (Solid Waste)
RN  - 00BH33GNGH (Cadmium)
RN  - 059QF0KO0R (Water)
RN  - 2P299V784P (Lead)
RN  - 7440-44-0 (Carbon)
RN  - EC 3.5.1.5 (Urease)
RN  - H0G9379FGK (Calcium Carbonate)
RN  - SY7Q814VUP (Calcium)
SB  - IM
MH  - Bacteria
MH  - Cadmium
MH  - Calcium
MH  - Calcium Carbonate
MH  - Carbon/chemistry
MH  - Coal Ash/chemistry
MH  - Incineration/methods
MH  - Lead
MH  - *Metals, Heavy/analysis
MH  - Particulate Matter
MH  - *Refuse Disposal/methods
MH  - Solid Waste/analysis
MH  - Urease
MH  - Water
OTO - NOTNLM
OT  - MSWI fly ash
OT  - Microbially induced calcium carbonate precipitation
OT  - Microstructures
OT  - Solidification
OT  - Stabilization
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- 2022/08/27 06:00
MHDA- 2022/10/14 06:00
CRDT- 2022/08/26 19:26
PHST- 2022/05/20 00:00 [received]
PHST- 2022/08/08 00:00 [revised]
PHST- 2022/08/14 00:00 [accepted]
PHST- 2022/08/27 06:00 [pubmed]
PHST- 2022/10/14 06:00 [medline]
PHST- 2022/08/26 19:26 [entrez]
AID - S0045-6535(22)02582-6 [pii]
AID - 10.1016/j.chemosphere.2022.136089 [doi]
PST - ppublish
SO  - Chemosphere. 2022 Dec;308(Pt 1):136089. doi: 10.1016/j.chemosphere.2022.136089. 
      Epub 2022 Aug 23.