Hydrogen sulfide (HS) is one of the sewer gases commonly found in wastewater collection systems. This anaerobic degradation product causes issues, ranging from odor nuisances and health hazards to pipe corrosion. Several studies have provided an understanding of HS formation mechanism, including simulations of HS emissions in sewers, especially in pressurized systems. However, the present models necessitate a large amount of data due to the complexity of the HS processes and common routine-monitoring water quality parameters may not fit the requirements. This study aims to simulate the fate and transport of HS in both air and water phases in combined sewers, with a realization of practicableness of the application. The study case is centered around a fresh market in Bangkok, where the sewers are commonly plagued with garbage-related issues. These challenges pose difficulties for site monitoring across various aspects, necessitating the application of unconventional methods. On-site hydrodynamics, wastewater quality, and HS gas concentration data were monitored on hourly and daily bases. It was found that the sulfides in the combined sewerage were correlated with sewage quality, e.g., COD, sulfate (SO), and pH concentrations in particular. The model results were in an acceptable range of accuracy (R = 0.63; NSE = 0.52; RMSE = 1.18) after being calibrated with the measured hydrogen sulfide gas concentration. The results lead to the conclusion that the simplified model is practical and remains effective even in sewers with untraditional conditions. This could hold promise as a fundamental tool in shaping effective HS mitigation strategies.

中文翻译：

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在曼谷 Rat Burana 新鲜市场合流下水道中实施硫化氢两相建模

硫化氢 (HS) 是废水收集系统中常见的下水道气体之一。这种厌氧降解产物会引起各种问题，从气味滋扰、健康危害到管道腐蚀。多项研究提供了对 H2S 形成机制的了解，包括模拟下水道中的 H2S 排放，特别是在加压系统中。然而，由于HS过程的复杂性，现有模型需要大量数据，并且常见的常规水质监测参数可能无法满足要求。本研究旨在模拟合流下水道中 H2S 在气相和水相中的归宿和迁移，以实现应用的实用性。该研究案例以曼谷的一个生鲜市场为中心，那里的下水道经常受到垃圾相关问题的困扰。这些挑战给各个方面的现场监测带来了困难，需要采用非常规方法。每小时和每天监测现场水动力、废水质量和 H2S 气体浓度数据。研究发现，合流污水中的硫化物与污水质量相关，例如COD、硫酸盐(SO)，尤其是pH 浓度。用实测硫化氢气体浓度进行校准后，模型结果处于可接受的精度范围内（R = 0.63；NSE = 0.52；RMSE = 1.18）。结果得出的结论是，简化模型是实用的，即使在非传统条件下的下水道中也仍然有效。这有望成为制定有效的 H2S 缓解策略的基本工具。