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Comparative Study of Biofilters Application for Ammonia Elimination from Industrial Sites

Pouri, Hamed | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43584 (06)
  4. University: Sharif University Of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Shayegan, jalaloddin; Massoudinejad, Mohammad Reza
  7. Abstract:
  8. In this study, for removing ammonia from air, biofilters which is suitable method for removing odors, volatile organic compounds and toxic materials are used. Biofiltration is an efficient, easy and cost effective, environmental friendly process for degradation of ammonia from waste air. Aim of this study is comparative study of biofilters application for ammonia elimination from industrial sites.In order to remove ammonia, two columns with 14 cm inner diameter were used. One of the columns is filled with vermicompost and mineral shell (mineral shell : vermicompost, 1 : 4) and another column is filled with concentrated sludge and scallop (scallop : concentrated sludge, 2 : 3). Each of the columns is filled to 26 cm height and volume of each of used beds is 4 liter.In this study,the performances of biofilters were studied under 10 different flow rates (1, 2, 3, 4, 5, 6, 7, 8, 9 and 10 lit/min) and 5 different concentrations intervals (0-20, 20-40, 40-60, 60-80and 80-100 ppm) in the 25 degree celsius temperature and optimum moisture interval.The results of this study show that efficiency is decreased when flow rate or concentration is increased. In similar flow rate and concentration,the efficiency of concentrated sludge is more than the efficiency of vermicompost. The efficiency of vermicompost was changed between 85.7- 98.8 percent and the efficiency of concentrated sludge was changed between 91.3 – 100 percent. Efficiency of concentrated sludge in 0-20 and 20-40ppm concentrations intervals at 1 lit/min flowrate and 0-20 ppm at 2 lit/min was 100 percent. The best flow rate for both of the beds was 1 lit/min and the best empty bed residence time for both of the beds attained 240 seconds.Maximum applied loading rate was 9.79 g/(m3.h) and minimum applied loading rate was 0.19 g/(m3.h). maximum elimination capacity for both of the beds occurred on 9.79 g/(m3.h) loading rate. maximum elimination capacity for vermicompost was 8.39 g/(m3.h) and for concentrated sludge was 8.93 g/(m3.h). in industrial cases with having flow rate and concentration of ammonia gas and using the results of this study we can calculate the volume of the necessary bed and dimensions of necessary biofiltration columns.
  9. Keywords:
  10. Ammonia ; Air Pollution ; Biofilter

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