Cao Zhiwei, Xu Zhen, Chen Yufeng, Zhao Bingxuan, Wang Chenxu, Yu Zuozhou, Zhou Jingya
Department of Agricultural Resources and Environment, College of Agriculture, Yanbian University, Yanji 133002, China.
College of Geography and Ocean Sciences, Yanbian University, Yanji 133002, China.
Microorganisms. 2025 Jun 30;13(7):1534. doi: 10.3390/microorganisms13071534.
This study addresses the microbial corrosion of cement-based materials in coastal urban sewer networks, systematically investigating the kinetic mechanisms of sulfur biogeochemical cycling under seawater infiltration conditions. Through dynamic monitoring of sulfide concentrations and environmental parameter variations in anaerobic pipelines, a multiphase coupled kinetic model integrating liquid-phase, gas-phase, and biofilm metabolic processes was developed. The results demonstrate that moderate salinity enhances the activity of sulfate-reducing bacteria (SRB) and accelerates sulfate reduction rates, whereas excessive sulfide accumulation inhibits SRB activity. At 35 °C, the mathematical model coefficient "a" for sulfate reduction in the reactor with 3 g/L salinity was significantly higher than those in reactors with 19 g/L and 35 g/L salinities, with no significant difference observed between the latter two. Overall, high sulfate concentrations do not act as limiting factors for sulfide oxidation under anaerobic conditions; instead, they enhance the reaction within specific concentration ranges. The refined kinetic model enables prediction of sulfur speciation in tropical coastal urban sewer pipelines, providing a scientific basis for corrosion risk assessment.
本研究针对沿海城市污水管网中水泥基材料的微生物腐蚀问题，系统地研究了海水渗入条件下硫生物地球化学循环的动力学机制。通过对厌氧管道中硫化物浓度和环境参数变化的动态监测，建立了一个整合液相、气相和生物膜代谢过程的多相耦合动力学模型。结果表明，适度的盐度会增强硫酸盐还原菌（SRB）的活性并加快硫酸盐还原速率，而过量的硫化物积累会抑制SRB的活性。在35℃时，盐度为3 g/L的反应器中硫酸盐还原的数学模型系数“a”显著高于盐度为19 g/L和35 g/L的反应器，后两者之间未观察到显著差异。总体而言，高硫酸盐浓度在厌氧条件下并非硫化物氧化的限制因素；相反，在特定浓度范围内它们会增强反应。改进后的动力学模型能够预测热带沿海城市污水管道中的硫形态，为腐蚀风险评估提供科学依据。
