PMID- 31193181
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20200930
IS  - 2215-0161 (Print)
IS  - 2215-0161 (Electronic)
IS  - 2215-0161 (Linking)
VI  - 6
DP  - 2019
TI  - Laboratory method of microbial induced solidification/stabilization for municipal 
      solid waste incineration fly ash.
PG  - 1036-1043
LID - 10.1016/j.mex.2019.05.006 [doi]
AB  - This paper presents a method to solidify/stabilize the municipal solid waste 
      incineration (MSWI) fly ash by originally employing the microbial induced 
      carbonate precipitation (MICP) technique. In this method, the rich endogenous 
      calcium in the MSWI fly ash was utilized to induce calcite precipitation, which 
      is different from the operation of adding extra calcium source in previous 
      researches. The fly ash sample had a CaO content of 44.5%, and its leaching 
      concentrations of Zn, Cr and Pb exceed the limits of the identification standard 
      for hazardous wastes in China. The optical density at 600 nm (OD600) of the 
      bacterial solution was about 1.0 after the processes of bacterial activation and 
      reproduction. The prepared fly ash sample was well mixed with bacterial solution 
      at an ash-liquid ratio of 1 kg: 0.3 L and cured at a temperature of 20  degrees C and a 
      humidity of >/=95% for 7 days. After treatment, the heavy metal leachability 
      significantly reduced to meet the standard for pollution control of landfill 
      site, and the unconfined compressive strength increased approximately 40%. The 
      precipitated carbonates were verified by SEM-EDS analysis and quantified by 
      measurement of carbonate content via acid-dissolving method. The results shone a 
      light on the possibility of using MICP technique as a useful and efficient tool 
      to stabilize the MSWI fly ash before being reused or properly stored in 
      landfills. *The MICP method is efficient to reduce the heavy metal leachability 
      and increase the compressive strength of MSWI fly ash.*The endogenous calcium in 
      MSWI fly ash was utilized to induce calcite precipitation.*The heavy metals in 
      MSWI fly ash were well immobilized by the formation of carbonates.
FAU - Xu, Hui
AU  - Xu H
AD  - School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, 
      Hangzhou, 310018, China.
FAU - Zheng, Hao
AU  - Zheng H
AD  - School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, 
      Hangzhou, 310018, China.
FAU - Wang, Jin-Nan
AU  - Wang JN
AD  - School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, 
      Hangzhou, 310018, China.
FAU - Ding, Xiao-Qing
AU  - Ding XQ
AD  - School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, 
      Hangzhou, 310018, China.
FAU - Chen, Ping
AU  - Chen P
AD  - School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, 
      Hangzhou, 310018, China.
LA  - eng
PT  - Journal Article
DEP - 20190507
PL  - Netherlands
TA  - MethodsX
JT  - MethodsX
JID - 101639829
PMC - PMC6520556
OTO - NOTNLM
OT  - Compressive strength
OT  - Endogenous calcium
OT  - Heavy metal leachability
OT  - Microbial induced carbonate precipitation (MICP)
OT  - Microbial induced solidification/stabilization method
OT  - Municipal solid waste incineration (MSWI) fly ash
OT  - Solidification/stabilization method
EDAT- 2019/06/14 06:00
MHDA- 2019/06/14 06:01
PMCR- 2019/05/07
CRDT- 2019/06/14 06:00
PHST- 2018/09/27 00:00 [received]
PHST- 2019/05/04 00:00 [accepted]
PHST- 2019/06/14 06:00 [entrez]
PHST- 2019/06/14 06:00 [pubmed]
PHST- 2019/06/14 06:01 [medline]
PHST- 2019/05/07 00:00 [pmc-release]
AID - S2215-0161(19)30125-6 [pii]
AID - 10.1016/j.mex.2019.05.006 [doi]
PST - epublish
SO  - MethodsX. 2019 May 7;6:1036-1043. doi: 10.1016/j.mex.2019.05.006. eCollection 
      2019.