RENJun-hao,YINWei-min,HEXian-shu,et al.Effect of Hydraulic Conditions on Abundance of Sulfate-reducing Bacteria and Methanogen in Sediment Layer of Sewage Pipe Network[J].China Water & Wastewater,2022,38(23):17-22.
水力条件对污水管网沉积层中SRB与MA的影响
- Title:
- Effect of Hydraulic Conditions on Abundance of Sulfate-reducing Bacteria and Methanogen in Sediment Layer of Sewage Pipe Network
- Keywords:
- sewage pipe network; sediment layer; hydraulic disturbance; sulfate-reducing bacteria; methanogen
- 摘要:
- 为探明城市污水管网水力条件对沉积层中硫酸盐还原菌（SRB）和产甲烷菌（MA）的影响，建立了一套长为132 m、管径为DN400的城市污水管道试验系统，探究了污水管道中水体流速对沉积层污染物、环境因子、SRB和MA的影响。结果表明，在污水流速为0.50~1.20 m/s的冲刷条件下，随冲刷时间的增加，沉积层中碳硫基质不断减少，DO和ORP不断升高，沉积层微生物环境显著改变。在水力扰动下，SRB和MA的种群丰度也发生了变化。由于所在沉积物受到污水的扰动（流速为0.50~1.20 m/s），SRB种群丰度随冲刷时间的增加呈下降趋势；而MA种群丰度在污水流速为0.50 m/s条件下整体呈升高趋势，在流速为0.75~1.20 m/s条件下则呈下降趋势。通过监测不同流速扰动沉积物表层、中层后硫化氢（H2S）和甲烷（CH4）的浓度，发现扰动沉积物中层后能减少两种气体的产生，并且1.00、1.20 m/s这种较大流速在影响沉积物中层微生物环境的同时能够显著影响沉积物的底层，有效抑制了H2S和CH4气体的产生。
- Abstract:
- To investigate the effect of hydraulic conditions of urban sewage pipe network on sulfate?reducing bacteria (SRB) and methanogen (MA) in sediment layer, a set of urban sewage pipe test system with length of 132 m and diameter of DN400 was established to explore the influence of flow velocity on pollutants, environmental factors and abundance of SRB and MA in the sediment layer. When the flow velocity of sewage was 0.50-1.20 m/s, the carbon and sulfur substrates in the sediment layer decreased, DO and ORP increased, and the microbial environment in the sediment layer changed significantly with the scouring time. The abundance of SRB and MA also changed when there was hydraulic disturbance. Because the sediment was disturbed by the flow of sewage (the flow velocity was 0.50-1.20 m/s), the abundance of SRB decreased with the extension of scouring time. The overall profile of the abundance of MA was increasing when the flow velocity of sewage was 0.50 m/s, and was decreasing when the flow velocity was 0.75-1.20 m/s. By monitoring the concentration of hydrogen sulfide (H2S) and methane (CH4) in the surface and middle layers of disturbed sediments at different flow velocities, it was found that the production of the two gases was reduced after the disturbance of the middle layer of sediments. In addition, the high flow velocities of 1.00 m/s and 1.20 m/s significantly affected the microbial environment in the middle layer of sediments and the bottom layer of sediments, and thus the production of H2S and CH4 was effectively inhibited.
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