Sulfide emissions in sewer networks: focus on liquid to gas mass transfer coefficient

被引:11
作者
Carrera, Lucie [1 ]
Springer, Fanny [1 ]
Lipeme-Kouyi, Gislain [1 ]
Buffiere, Pierre [1 ]
机构
[1] Univ Lyon, INSA Lyon, Lab Waste Water Environm Pollut, 9 Rue Phys, F-69621 Villeurbanne, France
关键词
correlation; gravity pipe; H2S emission; local turbulence intensity; numerical simulation; reaeration; HYDROGEN-SULFIDE; OXYGEN-TRANSFER; GRAVITY SEWERS; STREAMS; RATES;
D O I
10.2166/wst.2017.070
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
H2S emission dynamics in sewers are conditioned by the mass transfer coefficient at the interface. This work aims at measuring the variation of the mass transfer coefficient with the hydraulic characteristics, with the objective of estimating H2S emission in gravity pipes, and collecting data to establish models independent of the system geometry. The ratio between the H2S and O-2 mass transfer coefficient was assessed in an 8 L mixed reactor under different experimental conditions. Then, oxygen mass transfer measurements were performed in a 10 m long gravity pipe. The following ranges of experimental conditions were investigated: velocity flow [0-0.61 m. s(-1)], Reynolds number [0-23,333]. The hydrodynamic parameters at the liquid/gas interface were calculated by computational fluid dynamics (CFD). In the laboratory- scale reactor, the O-2 mass transfer coefficient was found to depend on the stirring rate (rph) as follows: K-L,K-O2 0: 016 + 0.025 N-3.85. AK(L,H2S/KL,O2) ratio of 0.64 +/- 0.24was found, in accordance with previously published data. CFD results helped in refining this correlation: the mass transfer coefficient depends on the local interface velocity ui(m.h(-1)): K-L,K-O2 = 0: 016 + 1.02 x 10(-5) ui(3.85) In the gravity pipe device, K-L,K-O2 also exponentially increased with the mean flow velocity. These trends were found to be consistent with the increasing level of turbulence.
引用
收藏
页码:1899 / 1908
页数:10
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