College of Urban Construction, Nanjing Tech University, Nanjing, 211800, China; Jiangsu Key Laboratory of Industrial Water-Conservation & Emission Reduction, Nanjing Tech University, Nanjing, 211800, China.
College of Urban Construction, Nanjing Tech University, Nanjing, 211800, China.
Environ Pollut. 2023 Nov 15;337:122596. doi: 10.1016/j.envpol.2023.122596. Epub 2023 Sep 23.
Transformation of sulfur in sewage pipeline was affected by water flow, and the transformation laws at different locations in the sediment-water system were different. This work studied the changes of sulfur in sediments, sewage, and upper space of the sewage pipeline, analyzed the differences in microbial community under different hydraulic retention time (HRT) and depth, and focused on the transformation law of sulfur. Results showed that sulfate and sulfide concentrations in sewage were higher than those in sediments under anaerobic conditions. Moreover, sulfate and sulfide concentrations in sediments decreased with depth. When HRT decreased from 3 h to 1 h, HS concentration increased evidently, whereas sulfate concentration decreased in the sewage and sediment, and sulfide concentration increased in sewage and surface sediment. Those differences were related to the relative abundances of the two microbial communities. The relative abundances of sulfate-reducing bacteria (SRB), such as Desulfobacter, Desulfovibrio, and Desulfomicrobium, were higher in surface sediment. Correspondingly, those of Thiobacillus, Bacillus, and other sulfur-oxidizing bacteria (SOB) and Smithella were higher in deep sediment. The decrease of HRT might worsen the mass transfer effect of dissolved oxygen, thereby increasing the production rate of sulfur and causing HS to easily escape from sewage.
污水管道中硫的转化受水流影响，在沉积-水系统的不同位置，其转化规律也不同。本工作研究了沉积物、污水和污水管道上空间中硫的变化，分析了不同水力停留时间（HRT）和深度下微生物群落的差异，并重点研究了硫的转化规律。结果表明，在厌氧条件下，污水中的硫酸盐和硫化物浓度高于沉积物中的浓度。此外，沉积物中的硫酸盐和硫化物浓度随深度的增加而降低。当 HRT 从 3 小时减少到 1 小时时，HS 浓度明显增加，而污水和沉积物中的硫酸盐浓度降低，污水和表层沉积物中的硫化物浓度增加。这些差异与两种微生物群落的相对丰度有关。硫酸盐还原菌（SRB），如脱硫杆菌、脱硫弧菌和脱硫微菌，在表层沉积物中的相对丰度较高。相应地，硫氧化菌（SOB）和史密斯菌等硫氧化菌以及芽孢杆菌在深层沉积物中的相对丰度较高。HRT 的降低可能会恶化溶解氧的传质效果，从而增加硫的产生速率，导致 HS 容易从污水中逸出。
