naa a22 4500 510752268 CHVBK 20180411083109.0 cr unu---uuuuu 180411e20130201xx s 000 0 eng 10.1007/s11270-012-1405-0 doi (NATIONALLICENCE)springer-10.1007/s11270-012-1405-0 Modeling Ammonium Adsorption on Broiler Litter and Cake [Elektronische Daten] [Wei-zhen Liang, Sanjay Shah, John Classen, Ratna Sharma-Shivappa] Ammonia emission from broiler houses is a major concern because of its impacts on the environment. To reduce ammonia emissions, it is necessary to understand the fate of ammonia/um in the broiler waste. In broiler waste, uric acid and urea hydrolyze to ammonia (NH3) and a fraction of NH3 converts to ammonium (NH4 +) depending on pH and temperature. Further, NH4 + undergoes solid-liquid partitioning and the ammonia fraction is partitioned among the solid, liquid, and gas phases in the waste. Ammonium partitioning between solid and liquid phases in broiler cake and litter were measured at pH of 4, 6, and 7. Ammonium adsorption increased with pH in both broiler litter and cake. Adsorption capacity of the litter was much lower than broiler cake. Six NH4 + adsorption/desorption isotherms (linear, Langmuir, Freundlich, Temkin, Redlich-Peterson, and Toth) were evaluated. The isotherm that provided the best fit for partitioning NH4 + in litter or cake for each pH value was selected by comparing up to six sets of parameters modeled using linear and nonlinear (with five error functions) regressions. Despite high R 2 values obtained using linear regression, linearizing the models introduced an offset into the model reducing their accuracy. The sum of normalized error was used to select the most suitable parameter set for each isotherm. While the nonlinear error functions were the more suitable for developing parameter sets in broiler litter, for cake, linear regression generally provided the most optimum parameter sets. Whereas the Freundlich, linear, and Temkin isotherms were the most suitable for broiler litter for pH of 4, 6, and 7, respectively, for the cake, the linear isotherm was the most suitable for the entire range of pH evaluated. Overall, due to its simplicity, the linear isotherm seems suitable for partitioning NH4 + in the adsorbed and dissolved phases for simulating nitrogen fate and dynamics in broiler waste more accurately. Springer Science+Business Media Dordrecht, 2013 Desorption nationallicence Langmuir isotherm nationallicence Freundlich isotherm nationallicence Temkin isotherm nationallicence Linear isotherm nationallicence Redlich-Peterson isotherm nationallicence Toth isotherm nationallicence Linear regression nationallicence Nonlinear regression nationallicence Error functions nationallicence Liang Wei-zhen Department of Agricultural and Biological and Engineering, Purdue University, 47907, West Lafayette, IN, USA aut Shah Sanjay Department of Biological and Agricultural Engineering, North Carolina State University, 27695, Raleigh, NC, USA aut Classen John Department of Biological and Agricultural Engineering, North Carolina State University, 27695, Raleigh, NC, USA aut Sharma-Shivappa Ratna Department of Biological and Agricultural Engineering, North Carolina State University, 27695, Raleigh, NC, USA aut Water, Air, & Soil Pollution Springer Netherlands 224/2(2013-02-01), 1-15 0049-6979 224:2<1 2013 224 11270 https://doi.org/10.1007/s11270-012-1405-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11270-012-1405-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Liang Wei-zhen Department of Agricultural and Biological and Engineering, Purdue University, 47907, West Lafayette, IN, USA aut NATIONALLICENCE 700 1- Shah Sanjay Department of Biological and Agricultural Engineering, North Carolina State University, 27695, Raleigh, NC, USA aut NATIONALLICENCE 700 1- Classen John Department of Biological and Agricultural Engineering, North Carolina State University, 27695, Raleigh, NC, USA aut NATIONALLICENCE 700 1- Sharma-Shivappa Ratna Department of Biological and Agricultural Engineering, North Carolina State University, 27695, Raleigh, NC, USA aut NATIONALLICENCE 773 0- Water, Air, & Soil Pollution Springer Netherlands 224/2(2013-02-01), 1-15 0049-6979 224:2<1 2013 224 11270 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer