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Removing ammonia from air with a constant pH, slightly acidic water spray wet scrubber using recycled scrubbing solution

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Abstract

Previous research on wet scrubbers has only studied highly acidic scrubbing solutions because of their high ammonia capture efficiencies; however, the high acidity created practical problems. Lower acidity solutions would reduce corrosion, maintenance, and cost; however, designers may need to use strategies for increasing scrubber effectiveness, such as using lower air velocities. The objective of this study was to determine if a spray scrubber with slightly acidic and higher pH scrubbing solution (pH from 2 to 8) could effectively remove NH3 from NH3 laden air (such as animal building exhaust air), and also collect this valuable resource for later use as a fertilizer. A bench-scale spray wet scrubber treated 20 ppmv NH3/air mixture in a countercurrent contact chamber. First, the solution pH was varied from 2 to 8 while maintaining constant air velocity at 1.3 m•s–1. Next, air velocity was increased (2 and 3 m•s–1) while solution pH remained constant at pH6. At 1.3 m•s–1, NH3 removal efficiencies ranged between 49.0% (pH8) and 84.3% (pH2). This study has shown that slightly acidic scrubbing solutions are a practical means of removing ammonia from air especially if the scrubber is designed to increase collisions between solution droplets and NH3 molecules. The NH3 removed from the air was held in solution as NH4 + and accumulates over time so the solution should be an excellent fertilizer.

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Authors and Affiliations

  1. Biological & Agricultural Engineering Department, Texas A&M University, College Station, TX, 77843, USA

    Ahmad Kalbasi Ashtari, Amir M. Samani Majd & Gerald L. Riskowski

  2. University of Florida, Gainesville, FL, 32611, USA

    Saqib Mukhtar

  3. Deptartment of Food, Agricultural and Biological Engineering, Ohio State University, Columbus, OH, 43210, USA

    Lingying Zhao

Authors
  1. Ahmad Kalbasi Ashtari
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  2. Amir M. Samani Majd
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  3. Gerald L. Riskowski
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  4. Saqib Mukhtar
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  5. Lingying Zhao
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Correspondence to Gerald L. Riskowski.

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Ashtari, A.K., Majd, A.M.S., Riskowski, G.L. et al. Removing ammonia from air with a constant pH, slightly acidic water spray wet scrubber using recycled scrubbing solution. Front. Environ. Sci. Eng. 10, 3 (2016). https://doi.org/10.1007/s11783-016-0869-3

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  • DOI: https://doi.org/10.1007/s11783-016-0869-3

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