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.
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Effect of Hydraulic Conditions on Abundance of Sulfate-reducing Bacteria and Methanogen in Sediment Layer of Sewage Pipe Network

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第38卷 Number: 第23期 Page: 17-22 Column: Date of publication: 2022-12-01
Author(s):
REN　Jun-hao1;  YIN　Wei-min2;  HE　Xian-shu2;  SHI　Xuan1; 3;  JIN　Xin1; 3;  JIN　Peng-kang1; 3
（1. School of Environmental and Municipal Engineering， Xi’an University of Architecture and Technology， Xi’an 710055， China； 2. Shaanxi Water Affair Group Co. Ltd.， Xi’an 710000， China； 3. School of Human Settlements and Civil Engineering， Xi’an Jiaotong University， Xi’an 712000， China）
Keywords:
sewage pipe network;  sediment layer;  hydraulic disturbance;  sulfate-reducing bacteria;  methanogen
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.
Last Update: 2022-12-01