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http://dx.doi.org/10.17137/korrae.2021.29.4.5

Reduction of ammonia conversion from urea by adding acetohydroxamic acid  

Yun, Gwang Su (Department of Environmental Engineering, Chungbuk National University)
Oh, Ha Eun (Division of Animal Environment, National Institute of Animal Science)
Jung, Min Woong (Division of Animal Environment, National Institute of Animal Science)
Hwang, Okhwa (Division of Animal Environment, National Institute of Animal Science)
Yun, Yeo-Myeong (Department of Environmental Engineering, Chungbuk National University)
Publication Information
Journal of the Korea Organic Resources Recycling Association / v.29, no.4, 2021 , pp. 5-13 More about this Journal
Abstract
Ammonia, primarily originating from urinary urea of the livestock manure, is known to play as a major precursor of fine particulate matter (PM2.5) generation which leads to a decrease in air quality and to harmful effects on public health. The objective of this study was to evaluate the effect of acetohydroxamic acid (AHA) addition on inhibition of ammonia conversion from urea. The experiment was performed at different urea concentration (500-4,000 mg Urea-N/L), AHA concentration (0-4,000 mg AHA/L), pHs (pH 6-10), and temperature (10-35℃). The result showed that the urease inhibition efficiency increased at higher concentration of AHA. However, the specific urease inhibition activity decreased at higher pH, showing 867.1±6.7 Unit/g AHA at pH 6 and 1,167.9±17.4 Unit/g AHA at pH 10, respectively. Decreased urease inhibition efficiency at both AHA and control was observed at higher temperature. This finding indicates that AHA can be used as the urease inhibitor for reducing ammonia emission in the management of livestock manure.
Keywords
Acetohydroxamic acid; Ammonia; Urea; Urease inhibitor;
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