Reduction of ammonia production in the biocementation process for sand using a new biocement

被引:43
作者
Yu, Xiaoniu [1 ]
Chu, Jian [1 ]
Yang, Yang [1 ]
Qian, Chunxiang [2 ]
机构
[1] Nanyang Technol Univ, Sch Civil & Environm Engn, Singapore 639798, Singapore
[2] Southeast Univ, Sch Mat Sci & Engn, Nanjing 211189, Peoples R China
基金
中国国家自然科学基金; 中国博士后科学基金;
关键词
Sand; Ammonia gas; Biocement; MICP; MISP; PRECIPITATION; PHOSPHATE;
D O I
10.1016/j.jclepro.2020.124928
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Biocementation using a microbially-induced carbonate precipitation (MICP) process has become a new method for soil improvement. However, this method produces ammonia gas which is not desirable. A new biocementation method using a microbially-induced struvite precipitation (MISP) process is proposed in this paper. The main cementation components produced by this method are struvite and basic magnesium phosphate as identified using X-ray diffraction (XRD). This new method can reduce the amount of ammonia discharge by more than 8 times. Sand treated using this method can reach an unconfined compressive strength of more than 1.47 MPa after three rounds of treatments. (C) 2020 Elsevier Ltd. All rights reserved.
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页数:7
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