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Ammonia Scrubbing Using Electrolyzed Water Spray Scrubber

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

Citation:  Paper number  131605985,  2013 Kansas City, Missouri, July 21 - July 24, 2013. (doi: http://dx.doi.org/10.13031/aim.20131605985) @2013
Authors:   Amir Masoud Samani Majd, Ahmad Kalbasi, Saqib Mukhtar, Gerald Riskowski
Keywords:   Ammonia Spray scrubber Electrolyzed water Contact time

Abstract. Emissions of ammonia (NH3) from poultry houses are increasing and intensifying some environmental concerns. Evaluating a new method of NH3 mitigation using a non-acidic solution in a bench-scale scrubber was the main objective of this research. The laboratory scrubber was built to process 51 cfm (0.024 m3/s) of a simulated polluted air coming out from a fan. The NH3 concentration in the mixed air averaged 20 ppm. The scrubbing process was conducted in a 5-ft long vertical scrubber body in order to investigate three effective parameters including contact times, nozzle types and scrubbing solutions. The contact times were set to be about 0.3, 0.6 and 0.9 s and acquired by changing the elevation of the spray nozzle. Two types of spray nozzle with different droplet sizes and spray patterns were applied. The nozzles had full-cone spray patterns with two different spray angles, Narrow-angle and Standard Type with 26° and 52°; respectively. Reverse osmosis (RO) water and two types of electrolyzed water (50 ppm of total chlorine) with pH = 9.0 and pH = 6.5 were also tested as scrubbing solutions. The parameters were evaluated in 18 treatments with three replications. As a result, all experiments were able to scrub NH3 gas from air with different efficiencies. The maximum efficiency of 56% was acquired by the narrow nozzle, 0.9 s contact time and electrolyzed water with pH = 6.5. Therefore, it was concluded that within the ranges studied, increasing the contact time, decreasing the pH of electrolyzed water and the narrow type of nozzle had increased the efficiency of the scrubber.

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