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Title

Mass transfer coefficient of ammonia in the air stripping process for municipal wastewater: An experimental study

Year: 1400
COI: JR_AET-7-4_005
Language: EnglishView: 56
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Authors

Arezoo Zangeneh - Department of Environmental Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
Sima Sabzalipour - Department of Environmental Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
Afshin Takdastan - Department of Environmental Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
reza jalilzadeh yengejeh - Department of Environmental Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
Morteza Abdullatif Khafaie - Department of Environmental Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran

Abstract:

This study evaluated the effects of different operating conditions and the air-to-water ratio (G/L) on the kinetics and the mass transfer coefficient of ammonia (KL) in the air stripping method for removing ammonium ions (NH۴+) from wastewater with low concentrations in municipal wastewater treatment plants (WWTPs). The impact of operating conditions including the temperature, initial ammonium ion concentration, pH, and air-to-water ratio (G/L) of <۲۰۰۰:۱ (۶۰:۱, ۷۰:۱, and ۸۰:۱) on KL in the air stripping method was investigated using artificial wastewater at laboratory scale. The NH۴+ concentrations in the wastewater samples were determined with the Nesslerization method (the standard method for the examination of water and wastewater). According to the results, the minimum (۰.۰۵۲۸ h-۱) and maximum (۰.۶۴۸۲۵ h-۱) of KL were obtained within ۱ to ۴ h in the operating status that included an initial ammonium ion concentration of ۳۳.۶۳-۵۲.۸۱ mg/l, a temperature of ۳۴-۴۵.۷ °C, a pH of ۹.۴۸-۱۲.۲, and an air-to-water ratio of ۶۰:۱-۸۰:۱. A comparison of the results of three regression models showed that the air-to-water ratio was the most effective factor on KL. Furthermore, in Model ۳ (multivariate linear regression model/comparing four parameters), the effects of the air-to-water ratio, pH, and temperature increased, leading to the acceleration and conversion of ammonium ions (NH۴+) to a gaseous form (NH۳). Also, the initial NH۴+ concentration and pH in Model ۴ (multivariate linear regression model by subgroup) at a low (۶۰:۱) and high (۸۰:۱) G/L ratio were the most influential factors on KL, respectively. The results of this study revealed that the air-to-water ratio (۶۰:۱, ۷۰:۱, and ۸۰:۱) could be used successfully for the elimination of ammonium ions from municipal WWTPs, leading to lower energy costs for the required aeration in the air stripping method.

Keywords:

Air stripping , Mass transfer coefficient , Ammonia , Air to water ratio , Municipal wastewater treatment plants

Paper COI Code

This Paper COI Code is JR_AET-7-4_005. Also You can use the following address to link to this article. This link is permanent and is used as an article registration confirmation in the Civilica reference:

https://civilica.com/doc/1414293/

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Zangeneh, Arezoo and Sabzalipour, Sima and Takdastan, Afshin and jalilzadeh yengejeh, reza and Abdullatif Khafaie, Morteza,1400,Mass transfer coefficient of ammonia in the air stripping process for municipal wastewater: An experimental study,https://civilica.com/doc/1414293

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