Department of Civil and Environmental Engineering, University of Alberta, Edmonton, AB T6G 2W2, Canada E-mail:
Drainage Planning, EPCOR Drainage Services, Edmonton, AB T5 J 3A3, Canada.
Water Sci Technol. 2020 Dec;82(11):2271-2281. doi: 10.2166/wst.2020.475.
Field work was performed to investigate the release of hydrogen sulphide (HS) and its transport in the sewer trunk with drops in the Bonnie Doon area in Edmonton, Alberta, Canada, in order to develop a proper odor control strategy. The liquid sulfide concentration in the upstream trunk was low (less than 1.0 mg/L), and no HS gas was detected in the head space under this low concentration. However, high HS gas concentration was detected in the middle reach of the trunk due to the stripping effect of the three drops (2.7 m, 5.2 m and 2.0 m) along the trunk. The released HS at drops was then transported in the sewer system and emitted at various locations and caused odor concerns. These drops played an important role in HS release, and the overall HS mass transfer coefficient at drops was much higher than that in normal gravity sewers. The overall oxygen and HS mass transfer coefficient (Ka) was estimated to be around 200 h and 300 h at the first two drops, respectively. Field sampling of biofilm indicates that Desulfomicrobium was identified as the sulfate-reducing bacteria (SRB) responsible for sulfide generation in sewer wall biofilm and Thiobacillus was the only predominant member in manhole wall biofilm contributing to sewer manhole corrosion.
为了制定合理的臭气控制策略，在加拿大阿尔伯塔省埃德蒙顿市邦尼道恩地区的污水干线中进行了现场调查，以研究硫化氢（HS）的释放及其在污水干线中的传输情况。上游干线中的液态硫化物浓度较低（低于 1.0mg/L），在这种低浓度下，检测不到头部空间中的 HS 气体。然而，由于干线中三个下降点（2.7m、5.2m 和 2.0m）的汽提作用，干线中部检测到高浓度的 HS 气体。在下降点释放的 HS 随后在污水系统中输送，并在各个位置排放，引起了气味问题。这些下降点在 HS 释放中起着重要作用，下降点处的总 HS 传质系数明显高于正常重力污水管道中的传质系数。在前两个下降点处，估算的总氧气和 HS 传质系数（Ka）分别约为 200h 和 300h。生物膜的现场采样表明，脱硫微菌被鉴定为负责污水管壁生物膜中硫化物生成的硫酸盐还原菌（SRB），而硫杆菌是唯一在人孔壁生物膜中占优势的成员，导致污水人孔腐蚀。
