Civil Engineering team recognized by the Canadian Society for Civil Engineering
Vancouver, Canada—June 1, 2009—UBC Civil Engineering Ph.D. student Kazi Parvez Fattah, M.A.Sc. student Ying (Melissa) Zhang, professor Don Mavinic and research associate Fred Koch have been awarded the Donald R. Stanley Award from the Canadian Society for Civil Engineering (CSCE) for the best paper in 2008 on a civil engineering subject in the area of environmental engineering.
The winning paper proved to be an excellent example of pilot-scale work that has field transferability of significant value to the practitioner. Written in an easy to understand style, the paper clearly shows that CO2 stripping can raise the liquid pH, improve struvite crystallization and, hence, fertilizer recovery, while simultaneously saving significant chemical costs by reducing/eliminating the use of caustic chemicals. This was the first time this had ever been shown to work at the pilot scale.
The paper “Application of carbon dioxide stripping for struvite cyrstallization – 1: Development of a carbon dioxide stripper model to predict CO2 removal and pH changes” was published in the Journal of Environmental Engineering and Science, Vol. 7, No. 4, 2008. Abstract - anchor needed here to link to below Abstract
Fattah accepted the honour on behalf of his co-authors at the 2009 CSCE annual conference in St. John’s, Newfoundland on May 30, 2009.
About the Canadian Society for Civil Engineering
Founded in 1887, the CSCE is a learned society intended to develop and maintain high standards of civil engineering practice in Canada and to enhance the public image of the civil engineering profession. The society has local sections across Canada that provides regular technical programs, supplemented with special technical workshops and seminars of special interest to that community.
For more information: http://www.csce.ca
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“Application of carbon dioxide stripping for struvite cyrstallization – 1: Development of a carbon dioxide stripper model to predict CO2 removal and pH changes,” the Journal of Environmental Engineering and Science, Vol. 7, No. 4, 2008
This research investigated the feasibility of stripping CO2 from the digester supernatant to raise the pH, thereby reducing the caustic chemical usage. In this study, a cascade CO2 stripper was first designed and tested, with three difference synthetic solutions in a struvite recovery, crystal reactor: (1) tap water saturated with CO2; (2) NaHCO3 solution saturated with CO2; and (3) NaHCO2 + NH2C1 solution saturated with CO2. It was found that the removal efficiency of the CO2 stripper was dependant on several parameters, such as the characteristics of the influent, including total alkalinity, temperature, and initial concentration of dissolved CO2 gas, influent flow rate, effluent recycle rate, aeration rate and baffle numbers in the stripper. Based on performance of the stripper on the three synthetic solutions, a CO2 stripping model was developed using these parameters. This model was subsequently tested in a pilot-scale facility, to predict the amount of CO2 removal possible.
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