Data issues with the nitration reaction?

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This post was last edited by luyafei414 on 2011-8-23 at 17:47. On page 104 of the book “Treatment Technologies and Engineering Applications for High-Concentration Organic Wastewater,” there is the following equation: NH4++1.83O2+1.98HCO3--------0.98NO3-+0.021C5H7NO2+1.88H2CO3+1.04H2O. Through calculations, it can be seen that for every 1 gram of ammonia nitrogen consumed in the nitrification process, approximately 4.33 grams of oxygen are used, 0.08 grams of inorganic carbon is consumed, 0.15 grams of new cells are produced, and 7.14 units of acidity (based on calcium carbonate) are generated. Some sources say so. Nitrification consumes approximately 4.57 g of oxygen for every 1 g of ammonia nitrogen consumed. How did I arrive at the figure of 4.18 g of oxygen per 1 g of ammonia nitrogen? Where do the other numbers come from? I hope my friend will let me know.