PMID- 31008588
OWN - NLM
STAT- MEDLINE
DCOM- 20190917
LR  - 20190917
IS  - 1520-5851 (Electronic)
IS  - 0013-936X (Linking)
VI  - 53
IP  - 10
DP  - 2019 May 21
TI  - Controlling the Distribution of Microbially Precipitated Calcium Carbonate in 
      Radial Flow Environments.
PG  - 5916-5925
LID - 10.1021/acs.est.8b06876 [doi]
AB  - Bacterially driven reactions such as ureolysis can induce calcium carbonate 
      precipitation, a well-studied process called microbially induced calcium 
      carbonate precipitation (MICP). MICP is of interest in subsurface applications 
      such as sealing leaks around wells. For effective field deployment, it is 
      important to study MICP under radial flow conditions, which are relevant to 
      near-well environments. In this study, a laboratory-scale radial flow reactor of 
      23 cm diameter, with a 1 mm glass bead monolayer serving as a porous medium, was 
      used to investigate the effects of fluid flow rates and calcium concentrations on 
      the mass and distribution of MICP by the ureolytic bacterium Sporosarcina 
      pasteurii. Experiments were performed at hydraulic residence times of 14, 7, and 
      3.5 min and calcium to urea molar ratios of 0.5:1, 1:1, and 2:1. The total amount 
      of CaCO(3) precipitated in the reactor increased with increasing residence time 
      and with decreasing Ca(2+) to urea molar ratios. Increased bacterial attachment 
      and increased CaCO(3) precipitation were observed with distance from the center 
      inlet of the reactor in all experiments. More uniform calcium distribution was 
      achieved at lower flow rates. The relationship between reaction and transport 
      rate (i.e., the Damkohler number) is identified as a useful parameter for the 
      prediction of MICP in radial flow environments.
FAU - Zambare, Neerja M
AU  - Zambare NM
AUID- ORCID: 0000-0002-8884-5096
FAU - Lauchnor, Ellen G
AU  - Lauchnor EG
FAU - Gerlach, Robin
AU  - Gerlach R
AUID- ORCID: 0000-0002-7669-3072
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PT  - Research Support, U.S. Gov't, Non-P.H.S.
DEP - 20190508
PL  - United States
TA  - Environ Sci Technol
JT  - Environmental science & technology
JID - 0213155
RN  - 8W8T17847W (Urea)
RN  - H0G9379FGK (Calcium Carbonate)
SB  - IM
MH  - *Calcium Carbonate
MH  - Chemical Precipitation
MH  - Porosity
MH  - *Sporosarcina
MH  - Urea
EDAT- 2019/04/23 06:00
MHDA- 2019/09/19 06:00
CRDT- 2019/04/23 06:00
PHST- 2019/04/23 06:00 [pubmed]
PHST- 2019/09/19 06:00 [medline]
PHST- 2019/04/23 06:00 [entrez]
AID - 10.1021/acs.est.8b06876 [doi]
PST - ppublish
SO  - Environ Sci Technol. 2019 May 21;53(10):5916-5925. doi: 10.1021/acs.est.8b06876. 
      Epub 2019 May 8.