Development of an HS emission model for wastewater treatment plants.

Modeling and prediction of HS emission from wastewater are important since gaseous HS will induce significant corrosion and odor problems. Most previous studies focused on HS emission of wastewater in pipeline systems, which may not be fit for HS emission in wastewater treatment plants (WWTPs). This study provided a two-phase mass transfer model for prediction of HS 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 HS in liquid phase. The results showed that the model can simulate and predict HS 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 HS emission concentrations and loads. Therefore, the model provides theoretical guidance for design of WWTPs regarding HS emissions.: Modeling and prediction of HS emission from wastewater are quite important since gaseous HS will induce significant corrosion and odor problems. Most of previous studies are focused on HS emission from wastewater in pipeline system, which may not be fit for HS emission in wastewater treatment plants (WWTPs). Thus in this study, a model for predicting HS 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 HS emission are analyzed. The model can be a useful tool to predict the HS concentration in odor gas collection system of WWTP and understand the behaviors of HS emission under different WWTPs operating conditions.