Microbially-Induced Calcium Carbonate Precipitation Test on Yellow Sandstone Based on LF-NMR Monitoring

Chao Zhuang, Chuang Liu, Ziteng Cui, Ze Yang, Yongqiang Chen and Zhi Dou ()
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Chao Zhuang: School of Earth Sciences and Engineering, Hohai University, Nanjing 210098, China
Chuang Liu: School of Earth Sciences and Engineering, Hohai University, Nanjing 210098, China
Ziteng Cui: Qingdao Zhongyu Environmental Testing Co., Ltd., Qingdao 266600, China
Ze Yang: School of Earth Sciences and Engineering, Hohai University, Nanjing 210098, China
Yongqiang Chen: School of Earth Sciences and Engineering, Hohai University, Nanjing 210098, China
Zhi Dou: School of Earth Sciences and Engineering, Hohai University, Nanjing 210098, China

IJERPH, 2022, vol. 19, issue 24, 1-13

Abstract: The microbially-induced calcium carbonate precipitation (MICP) technique has shown great robustness in dealing with soil and groundwater contamination problems. A typical result of the implementation of MICP technique is a change in the pore structure. In this study, the effects of MICP on the pore structure of yellow sandstone from the Zigong area, Sichuan, China under different conditions, (e.g., temperature, pH, and calcium ion concentration) are investigated using LF-NMR resonance. The pore network of yellow sandstone is accurately measured using the peak area of the T 2 spectral signal. The distribution of calcium carbonate in the pores of the yellow sandstone is characterized by the magnitude of the T 2 signal variation. The results show that the precipitation of calcium carbonate caused by MICP tends to be deposited in relatively large pores. However, the calcium carbonate precipitates in the smaller pores at a higher temperature. A higher pH considerably enhances the precipitation, and the alkaline environment tends to cause the precipitation of the calcium carbonate in the large pores. Although the amount of produced calcium carbonate continuously increases as the MCIP process continues, which is expected, the production efficiency decreases steadily.

Keywords: microbial induction; calcium carbonate; nuclear magnetic resonance; yellow sandstone; pore structure (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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