Department of Urban Water Management, Technical University of Berlin, Gustav-Meyer-Allee 25, 13355 Berlin, Germany E-mail:
Water Sci Technol. 2022 Aug;86(3):445-456. doi: 10.2166/wst.2022.198.
Hydrogen sulphide (HS) emissions in sewer systems lead to several problems such as corrosion, odour nuisances, and health damage to sewer workers. Although the gas is formed in the liquid phase, its effects are noticeable when released into the sewer atmosphere. Until recently, the lack of analytical procedures for continuous monitoring of HS in the liquid phase, as well as its toxicity, have challenged the quantification of the mass transfer coefficient under real conditions. Because of this, most studies have mainly focused on batch experiments with artificial wastewater and/or oxygen. The aim of this study was to experimentally determine the overall mass transfer coefficient for HS during intermittent pumping events common in actual sewer systems, using the two-film theory approach and employing online sensors for liquid and gas phase measurements. The mass transfer coefficient was quantified by carrying out 21 experiments with actual wastewater in a 25 m long gravity pipe of a sewer pilot plant located in Berlin (Germany). Results show that the corrected mass transfer coefficient (Ka) during a pumping event ranged between 0.1 and 8 h with a median value of 4.2 h, within the range of the results obtained by the most common empirical models.
污水系统中的硫化氢 (HS) 排放会导致多种问题，例如腐蚀、异味污染以及对污水工人的健康损害。尽管该气体是在液相中形成的，但当其释放到污水系统的大气中时，其影响是显而易见的。直到最近，由于缺乏连续监测液相中 HS 的分析程序以及其毒性，在实际条件下对传质系数的定量仍然具有挑战性。因此，大多数研究主要集中在使用人工废水和/或氧气的间歇式泵送实验上。本研究的目的是使用双膜理论方法，并采用在线传感器进行液相和气相测量，实验确定实际污水系统中常见的间歇式泵送事件中 HS 的总传质系数。在位于德国柏林的一个污水中试厂的 25 米长重力管道中，利用实际污水进行了 21 次实验，对传质系数进行了量化。结果表明，在泵送事件期间，经修正的传质系数 (Ka) 范围为 0.1 到 8 小时，中位数为 4.2 小时，这在最常见的经验模型的结果范围内。
