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Application of Diluted Sulfuric Acid for Manure Ammonia Extraction Using a Gas-Permeable Membrane

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  2012 Dallas, Texas, July 29 - August 1, 2012  121336810.(doi:10.13031/2013.42102)
Authors:   Amir Masoud Samani Majd, Saqib Mukhtar, Airton Kunz
Keywords:   Gas-permeable membrane, mitigation, ammonia extraction, diluted sulfuric acid

Tubular gas-permeable membrane (GPM) provides an alternative solution for ammonia (NH3) mitigation and recovery from liquid animal manure. A set-up consisting of a closed dairy liquid manure (LM) chamber, two sulfuric acid (H2SO4) flasks and two GPM systems was fabricated in order to investigate NH3 extraction processes using diluted H2SO4 solutions (pH values between 2 and 5.4). One GPM system was submerged below the LM surface and the other was suspended above LM surface in the headspace of the chamber. Ammonia from dairy LM was extracted and captured in acidic solution by circulating the diluted H2SO4 through both GPM systems. Results showed that the extraction of NH3 by both systems continued for few days, even though pH of the circulating acidic solution in the tubular GPM increased above the neutral pH value. By then, between 5% and 13% of the initial NH3 concentration of untreated LM were extracted by the circulating acidic solution in both systems. It was observed that the pH of acidic solution increased very quickly; especially for more diluted acid solutions. Among all experiments, the diluted acid with pH of 2 had the greatest NH3 removal and recovery as ammonium sulfate (NH4)2SO4, a potential fertilizer. However, none of the experiments with diluted acidic solutions resulted in greater extraction and recovery of NH3 from LM as compare to the strong acid (pH<0.4) used in a previous study.

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