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Ammonium Dissociation for Swine and Dairy Cattle Manures

Journal of Environmental Protection 2013年第5期4卷 6-15页

作者： Min Liu David giard Suzelle Barring.on China Institute of nuclear Information and Economics Beijing China Department of Building Civil and Environmental Engineering Concordia University Montreal Canada Department of Building Civil and Environmental Engineering Concordia University Montreal Canada Consumaj Inc. Quebec Canada

The dissociation of ammonium (nH4+) into ammonia (nH3) in wastewaters is a key factor g.verning.atmospheric nitrog.n volatilization. Relatively rich in total ammoniacal nitrog.n (TAn or nH4+ plus nH3), livestock manures are most susceptible to nH3 volatilization, althoug. indirect measurements report 5 times less nH4+ dissociation as compared to theoretical values. The objective of this study was therefore to directly measure nH4+ dissociation of two standard nH4Cl solutions (1750 and 3500 mg.TAn/L), and of swine and dairy cattle manures at various dilutions and temperatures using.a ammonia selective electrode (hydrog.n and silver-silver chloride electrode couple) at various pH and temperatures. All solutions demonstrated nH4+ dissociation varying.from theory, especially because of dissolved compounds such as atmospheric CO2. At a neutral pH, ratios of theoretical to measured [nH3-n] rang.d from 1.5 to 3.5, with hig.er ratios corresponding.to hig.er TAn levels. At a pH below 6, nH3 volatilization was enhanced by the shift of HCO3- to H2CO3 and CO2. With previous research projects reporting.5 times less nH3 volatilization as compared to theory, the present indicates that dissociation activity account for half of this drop with g.s diffusion accounting.for the other half.

关键词： Ammonium Dissociation Manure pH Temperature

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