ABSTRACT

Modeling and prediction of H₂S emission from wastewater are important since gaseous H₂S will induce significant corrosion and odor problems. Most previous studies focused on H₂S emission of wastewater in pipeline systems, which may not be fit for H₂S emission in wastewater treatment plants (WWTPs). This study provided a two-phase mass transfer model for prediction of H₂S emission concentrations. The model is based on the mass transfer rate equation of the mass transfer impetus, expressed by the concentration difference. The main parameters of the model are the mass transfer coefficient, the carrier gas flow rate and the concentration of H₂S in liquid phase. The results showed that the model can simulate and predict H₂S emission concentrations of various processes in WWTPs. Moreover, the model can analyze and predict the influences of different pH values, mass transfer coefficients and carrier gas flow rates on H₂S emission concentrations and loads. Therefore, the model provides theoretical guidance for design of WWTPs regarding H₂S emissions.

Implications: Modeling and prediction of H₂S emission from wastewater are quite important since gaseous H₂S will induce significant corrosion and odor problems. Most of previous studies are focused on H₂S emission from wastewater in pipeline system, which may not be fit for H₂S emission in wastewater treatment plants (WWTPs). Thus in this study, a model for predicting H₂S emission from typical units of WWTPs is established and verified. Moreover, the influences of pH values, mass transfer coefficients and carrier gas flow rates on H₂S emission are analyzed. The model can be a useful tool to predict the H₂S concentration in odor gas collection system of WWTP and understand the behaviors of H₂S emission under different WWTPs operating conditions.

摘要

废水中H ₂ S 排放的建模和预测很重要，因为气态 H ₂ S 会引起严重的腐蚀和气味问题。以前的大多数研究都集中在管道系统中废水的H ₂ S 排放上，这可能不适用于污水处理厂 (WWTP) 中的H ₂ S 排放。该研究提供了一种用于预测 H ₂ S 排放浓度的两相传质模型。该模型基于传质推动力的传质速率方程，用浓度差表示。模型的主要参数是传质系数、载气流量和H ₂浓度液相中的 S。结果表明，该模型可以模拟和预测污水处理厂各过程的H ₂ S排放浓度。此外，该模型可以分析和预测不同 pH 值、传质系数和载气流速对 H ₂ S 排放浓度和负载的影响。因此，该模型为污水处理厂设计H ₂ S 排放提供了理论指导。

影响：废水中H ₂ S 排放的建模和预测非常重要，因为气态 H ₂ S 会引起严重的腐蚀和气味问题。以往的研究大多集中在管道系统中废水的H ₂ S 排放上，这可能不适用于污水处理厂 (WWTP) 中的H ₂ S 排放。因此，本研究建立并验证了典型污水处理厂H ₂ S排放预测模型。此外，还分析了pH值、传质系数和载气流速对H ₂ S排放的影响。该模型可以成为预测 H ₂的有用工具污水处理厂恶臭气体收集系统中的 S 浓度，了解不同污水处理厂运行条件下H ₂ S 排放行为。