It reached 93.45% averagely at a micro-wave pretreatment of the spent catalyst to 950 ℃,addition of 387.5 g ammonium hydrogen carbonate and 900 mL ammonia per kg spent catalyst,3 h agitation at a liquid-solid ratio of 2∶1 and rinsing for four times.
Soil moisture, temperature, and nitrogen (ammonia and nitrates) at three depth intervals were also analyzed in these plots.
Ammonia SNCR tests indicated that N2O emission was 0-7 μmol/mol.
Change in genotoxicity of wastewater during chlorine dioxide and chlorine disinfections and the influence of ammonia nitrogen
It was then found that ammonia nitrogen did not affect the change of genotoxicity during chlorine dioxide disinfection of wastewater, while it greatly affected the change of genotoxicity during chlorine disinfection of wastewater.
In the nitrification, the average stoichiometric ratio between alkalinity consumption and ammonia oxidation is calculated to be 7.07 mg CaCO3/mg NH4+-N.