PMID- 35588665 OWN - NLM STAT- MEDLINE DCOM- 20220603 LR - 20220603 IS - 1095-8630 (Electronic) IS - 0301-4797 (Linking) VI - 316 DP - 2022 Aug 15 TI - A cleaner biocementation method of soil via microbially induced struvite precipitation: A experimental and numerical analysis. PG - 115280 LID - S0301-4797(22)00853-2 [pii] LID - 10.1016/j.jenvman.2022.115280 [doi] AB - Microbial-induced struvite precipitation (MISP) is a new biocementation method for soil improvement and hydraulic permeability reduction. Compared with traditional microbial-induced carbonate precipitation (MICP), MISP can significantly reduce the production of harmful ammonium ions during biochemical reactions and convert ammonium ions into struvite with promising mechanical strength. In this study, a series of experiments were conducted to compare the performance of the MICP and the MISP processes on sandy soils. Results showed that the average content of calcium carbonate in MISP cemented sand columns after 3 times of injection is similar to that in MICP cemented sand columns after 9 times of injection. The hydraulic permeability of MISP cemented sand columns after 3 times of injection is an order of magnitude lower than that of MICP cemented sand columns after 9 times of injection. To further investigate the physicochemical interactions during MISP and MICP processes, a one-dimensional finite element code considering the chemical reactions and the solute transportation was proposed. Results show that most of the MISP were formed in the early 3 h of the 6 h injection cycle, whereas most of the MICP were formed in the last 5 h of the injection cycle. The simulated total mass of the MISP precipitation, 11.3 g, was close to the experimental result of 9.6 g. The spatial distribution of MISP is more uneven as compared to MICP, as a result of the much faster reaction rate of struvite than calcium carbonate. The findings suggested that MISP could partially replace MICP in the applications of leakage mitigation and reinforcement of sandy soils. CI - Copyright (c) 2022 Elsevier Ltd. All rights reserved. FAU - Yu, Xiaoniu AU - Yu X AD - Jiangsu Key Laboratory of Construction Materials, Nanjing, 211189, China. Electronic address: xnyu09@163.com. FAU - Yang, Haoqing AU - Yang H AD - School of Naval Architecture, Ocean & Civil Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China. Electronic address: yanghaoqing@sjtu.edu.cn. FAU - Wang, Hao AU - Wang H AD - School of Civil Engineering, Dalian University of Technology, Dalian, 116024, China. Electronic address: hwang@dlut.edu.cn. LA - eng PT - Journal Article DEP - 20220516 PL - England TA - J Environ Manage JT - Journal of environmental management JID - 0401664 RN - 0 (Ammonium Compounds) RN - 0 (Carbonates) RN - 0 (Sand) RN - 0 (Soil) RN - AW3EJL1462 (Struvite) RN - H0G9379FGK (Calcium Carbonate) SB - IM MH - *Ammonium Compounds MH - Calcium Carbonate/chemistry MH - Carbonates MH - Chemical Precipitation MH - Sand MH - *Soil/chemistry MH - Struvite OTO - NOTNLM OT - Environment-friendly OT - Hydraulic permeability OT - MICP OT - MISP OT - Sandy soil EDAT- 2022/05/20 06:00 MHDA- 2022/06/07 06:00 CRDT- 2022/05/19 18:22 PHST- 2022/01/05 00:00 [received] PHST- 2022/04/11 00:00 [revised] PHST- 2022/05/08 00:00 [accepted] PHST- 2022/05/20 06:00 [pubmed] PHST- 2022/06/07 06:00 [medline] PHST- 2022/05/19 18:22 [entrez] AID - S0301-4797(22)00853-2 [pii] AID - 10.1016/j.jenvman.2022.115280 [doi] PST - ppublish SO - J Environ Manage. 2022 Aug 15;316:115280. doi: 10.1016/j.jenvman.2022.115280. Epub 2022 May 16.