Air Stripping of Ammoniacal Nitrogen from Fecal Sewage Using a Fluidized Bed

Abstract:

High concentrations of ammoniacal nitrogen in fecal sewage pose a great threat to subsequent treatment steps. The conventional removal technique in China mainly involves air stripping. However, the concentration of ammonia in the effluent is often very high, and the fillers in towers could exhibit scaling resulting in reduced lifetime in operation. Because of its high mass transfer characteristics, fluidized bed technology was used in our study of the air stripping method for improving the removal efficiency, using spherical biological ceramsites as the filler. The effects of temperature, pH, and fluidized bed residence time on the removal process were investigated. To compare the various effects of fluidized bed operation on nitrogen removal efficiency, traditional air stripping experiments were carried out using the identical gas flowrate, liquid flowrate, temperature and pH. The results show that the removal efficiency of ammoniacal nitrogen was improved using a fluidized bed. The mechanism of free ammonia mass transfer using fluidized bed technology was proposed. Finally, the filler adhesion problem was reduced and the technology was successfully applied to the air stripping of high concentration ammoniacal nitrogen from fecal sewage.

• Periodical: Advanced Materials Research (Volumes 926-930)
• Pages: 4209-4213
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.926-930.4209
• Online since: May 2014
• Authors: An Feng Li*, Yan Ying Ning, Wen Jiang Xu, Tao Pan
• Keywords: Air Stripping, Ammoniacal Nitrogen, Biological Haydite, Fecal Sewage, Fluidized Bed

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