Zhao Yanyun, Liu Wenhao, Hu Xiangming, Li Xiao, Wang Chengcheng, Yu Yiyun, Zhang Jing
College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, China; State Key Laboratory of Mine Lab Disaster Prevention and Control Co-found by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao, 266590, China; Institute of Yellow River Delta Earth Surface Processes and Ecological Integrity, Shandong University of Science and Technology, Qingdao, 266590, China.
College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, China; State Key Laboratory of Mine Lab Disaster Prevention and Control Co-found by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao, 266590, China; Institute of Yellow River Delta Earth Surface Processes and Ecological Integrity, Shandong University of Science and Technology, Qingdao, 266590, China.
Environ Res. 2023 Nov 15;237(Pt 2):116941. doi: 10.1016/j.envres.2023.116941. Epub 2023 Aug 24.
The wettability of microbially induced calcite precipitation (MICP) is a challenge in dust suppression. Herein, the tolerance of urease-producing flora to surfactants was investigated. The optimal tolerance concentrations of the urease-producing flora to sodium dodecylbenzene sulfonate (SDBS, anionic surfactant), alkyl polyglycoside (APG, non-ionic surfactant), and cocamidopropyl betaine (CAB, zwitterionic surfactant), and were 0.2%, 0.1%, and 0.05%. The cetyltrimethylammonium bromide (CTAB, cationic surfactant) inhibited urease production by urease-producing flora. The mineralization products of SDBS, APG, and CAB treatments were all transformed into calcite. The wind resistance test showed that the mass loss of all samples is less than 0.1%. The rain resistance and hardness tests showed that 0.2% SBDS had the best effect, followed by 0.1% APG and 0.05% CAB, and finally, No surfactants. Microbiome analysis showed that the abundance of Sporosarcina and Unclassified_bacillaceae reduced, and the intense competition between Paenalcaligenes and Sporosarcina are essential reasons for reducing urease activity. SDBS and APG could reduce the pathogenic risk of microbial dust suppressants. This study will facilitate the practical application of microbial dust suppressants.
微生物诱导碳酸钙沉淀（MICP）的润湿性是抑尘中的一项挑战。在此，研究了产脲酶菌群对表面活性剂的耐受性。产脲酶菌群对十二烷基苯磺酸钠（SDBS，阴离子表面活性剂）、烷基糖苷（APG，非离子表面活性剂）和椰油酰胺丙基甜菜碱（CAB，两性离子表面活性剂）的最佳耐受浓度分别为0.2%、0.1%和0.05%。十六烷基三甲基溴化铵（CTAB，阳离子表面活性剂）抑制产脲酶菌群产生脲酶。SDBS、APG和CAB处理的矿化产物均转化为方解石。抗风试验表明，所有样品的质量损失均小于0.1%。防雨和硬度试验表明，0.2%的SBDS效果最佳，其次是0.1%的APG和0.05%的CAB，最后是无表面活性剂处理。微生物群落分析表明，芽孢八叠球菌属和未分类芽孢杆菌科的丰度降低，嗜碱假单胞菌属和芽孢八叠球菌属之间的激烈竞争是脲酶活性降低的重要原因。SDBS和APG可以降低微生物抑尘剂的致病风险。本研究将促进微生物抑尘剂的实际应用。
