TY - JOUR
T1 - Study of magnesium precipitation based on biocementation
AU - Sun, Xiaohao
AU - Miao, Linchang
AU - Wu, Linyu
AU - Wang, Chengcheng
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (No. 51578147), Scientific Research Foundation of Graduate School of Southeast University (No. YBJJ1846). This work was also supported by “the Fundamental Research Funds for the Central Universities” and “Postgraduate Research & Practice Innovation Program of Jiangsu Province” (No. KYCX18_0107). The authors thank the valuable comments from the reviewers.
Publisher Copyright:
© 2018, © 2019 Informa UK Limited, trading as Taylor & Francis Group.
PY - 2019/11/26
Y1 - 2019/11/26
N2 - Magnesium carbonate has a cementing character like calcium carbonate, and the addition of magnesium ion enables the microbe cementitious material to have the denser microstructure with the lower porosity. The effects of various factors, such as the concentration of Ca2+ and Mg2+, on the urease activity were studied. Comparison of the productive rates for calcium carbonate and magnesium carbonate were carried out, as well as productive rates for magnesium carbonate with adding different amount of urea to medium. Calcium acetate and magnesium acetate were, respectively, used for sands solidification. Results showed that the increase in urea concentration and magnesium ion enhanced urease activity, while calcium ion significantly impaired urease activity. Sodium chloride and acetate ion had little influence on it. Productive rates for magnesium carbonate were dramatically smaller than its calcium counterpart. However, adding urea to medium allowed for more magnesium precipitation, and the higher the urea concentration, the more the magnesium precipitation. The sand columns with adding urea to medium can have a high strength despite using magnesium acetate. Therefore, the method could solve the problem of insufficient magnesium precipitation. The results will act as a guide for the application of biocementation technology with magnesium carbonate.
AB - Magnesium carbonate has a cementing character like calcium carbonate, and the addition of magnesium ion enables the microbe cementitious material to have the denser microstructure with the lower porosity. The effects of various factors, such as the concentration of Ca2+ and Mg2+, on the urease activity were studied. Comparison of the productive rates for calcium carbonate and magnesium carbonate were carried out, as well as productive rates for magnesium carbonate with adding different amount of urea to medium. Calcium acetate and magnesium acetate were, respectively, used for sands solidification. Results showed that the increase in urea concentration and magnesium ion enhanced urease activity, while calcium ion significantly impaired urease activity. Sodium chloride and acetate ion had little influence on it. Productive rates for magnesium carbonate were dramatically smaller than its calcium counterpart. However, adding urea to medium allowed for more magnesium precipitation, and the higher the urea concentration, the more the magnesium precipitation. The sand columns with adding urea to medium can have a high strength despite using magnesium acetate. Therefore, the method could solve the problem of insufficient magnesium precipitation. The results will act as a guide for the application of biocementation technology with magnesium carbonate.
KW - calcite precipitation
KW - factors
KW - magnesium carbonate
KW - sand solidification
KW - Sporosarcina pasteurii
UR - http://www.scopus.com/inward/record.url?scp=85060925899&partnerID=8YFLogxK
U2 - 10.1080/1064119X.2018.1549626
DO - 10.1080/1064119X.2018.1549626
M3 - Journal article
AN - SCOPUS:85060925899
SN - 1064-119X
VL - 37
SP - 1257
EP - 1266
JO - Marine Georesources and Geotechnology
JF - Marine Georesources and Geotechnology
IS - 10
ER -