School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China.
School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China.
J Environ Manage. 2024 Nov;370:122591. doi: 10.1016/j.jenvman.2024.122591. Epub 2024 Sep 18.
Microbially induced calcium precipitation (MICP) has been extensively discussed as a water treatment method. However, the impact of MICP on the selective adsorption of different organic contaminants in industrial wastewater and the metabolism and growth of bacteria has not been elucidated in detail. In this study, by comparing the differences in the metabolism and removal of bacteria by phenol, bisphenol A (BPA), and tetracycline (TC), it was found that bioprecipitates had significant differences in the adsorption capacity of organic pollutants with different molar volumes. Concurrently, bacteria produced more extracellular polymeric substances (EPS) under the influence of organic pollutants, and the self-protection mechanism of bacteria would reduce the amount of gaseous nitrogen. However, the points on the surface of EPS promoted the process of MICP, and MICP encapsulated bacteria to form precipitates to regulate bacteria in water and further improve the removal of carbon and nitrogen in water through biomineralization. This experiment provides new insights into the selective adsorption of bioprecipitates and its multiple effects on bacteria.
微生物诱导碳酸钙沉淀（MICP）已被广泛讨论作为一种水处理方法。然而，MICP 对工业废水中不同有机污染物的选择性吸附以及细菌的代谢和生长的影响尚未详细阐明。在这项研究中，通过比较苯酚、双酚 A（BPA）和四环素（TC）对细菌代谢和去除的差异，发现生物沉淀物对不同摩尔体积的有机污染物的吸附能力有显著差异。同时，细菌在有机污染物的影响下会产生更多的胞外聚合物（EPS），而细菌的自我保护机制会减少气态氮的量。然而，EPS 表面上的点促进了 MICP 的过程，MICP 将细菌包裹形成沉淀物，以调节水中的细菌，并通过生物矿化进一步提高水中碳和氮的去除率。该实验为生物沉淀物的选择性吸附及其对细菌的多种影响提供了新的见解。
