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Title: Air stripping process for ammonia recovery from source-separated urine : modeling and optimization
Authors: Liu, Bianxia
Giannis, Apostolos
Zhang, Jiefeng
Chang, Victor W.-C.
Wang, Jing-Yuan
Keywords: DRNTU::Engineering::Civil engineering::Water resources
DRNTU::Engineering::Environmental engineering::Waste management
Issue Date: 2014
Source: Liu, B., Giannis, A., Zhang, J., Chang, V. W. C., & Wang, J. Y. (2014). Air stripping process for ammonia recovery from source-separated urine : modeling and optimization. Journal of chemical technology & biotechnology, 90(12), 2208-2217.
Series/Report no.: Journal of chemical technology & biotechnology
Abstract: BACKGROUND: The air stripping process has been widely used to treat wastewater to prevent undesirable substances from impairing the quality of water sources. This study aimed to investigate the operational and economic aspects of air stripping for ammonia recovery from source separated human urine. RESULTS: The typical two-film model fails to explain the influence of pH on ammonia recovery. For that reason, modifications to the two-film model were applied to involve ammonia dissociation during mass transfer. It was found that increasing pH enhanced ammonia removal efficiency by promoting the free ammonia fraction in the solution. In addition, high air flow rate and temperature accelerated the stripping process due to the increase in mass transfer coefficient. From the economic point of view, unit operating cost was determined for 80% ammonia recovery. Results indicated that increasing air flow rate and temperature could reduce unit operating cost, whereas high pH could induce high unit operating cost due to the increase in chemical input. CONCLUSION: The modified two-film model can precisely estimate the critical values for an economic, efficient stripping process. However, a test-bedding study is required to validate the experimental findings.
ISSN: 0268-2575
DOI: 10.1002/jctb.4535
Rights: © 2014 Society of Chemical Industry.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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