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2013, vol. 38, iss. 1, pp. 1-13
Effect of a polymer on mitigating ammonia emission from liquid dairy manure
University of Idaho, College of Agricultural and Life Sciences, Department of Biological and Agricultural Engineering, Moscow, USA
Keywords: ammonia; emission; emission reduction; dairy manure; polymer
Reducing ammonia (NH3) emissions from manure has been a great interest for academic, regulators, dairy farmers, and the general public. Fresh liquid dairy manure was collected from a dairy central pit. A polymer (MTMTM) was tested at five different doses to determine if the polymer had any effects on reducing NH3 emission from the manure. Ogawa NH3 passive samplers were used to trap NH3 emitted from the manure for two, four, six, eight, 12, and 24 hours during two separate tests, respectively. Samples collected via the passive samplers were analyzed for ammonium-N (NH4-N) concentrations by a QuickChem 8500 system. Manure pH values were monitored before and after applying the polymer to the manure. The average concentration reductions of NH4-N in the extractant were 8.1%, 20.7%, 36.5%, 54.5%, and 88.2% for the polymer Treatments 1 to 5 over the entire test period, respectively. Statistically significant differences of the NH4-N concentration and manure pH were detected between the treatments and controls. However, a lower dose treatment (0.5 ml polymer/5 l manure) did not show significant differences of the NH4-N concentration and pH from control for the two-, four-, six-, and eight-hour samples, but showed significant differences for both the 12- and 24-hour samples. The test results have shown that a higher dose of polymer led to a lower manure pH and a lower NH3 emission. Further studies are needed to test if the pH adjustment was the only mechanism for reducing NH3 emission or other effects existed as well.
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article language: English
document type: Original Scientific Paper
published in SCIndeks: 24/03/2014

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