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4/2/2019 Effect of C/N Ratio on the Removal of Nitrogen and Microbial Characteristics in the Water Saturated Denitrifying Section of a Two-Stage C... <br /> 7 60 <br /> 6 55 <br /> 5 <br /> T 50 r, <br /> � — <br /> 45 <br /> 4 <br /> G -- —NII�--N in effluent of-I'l (control) <br /> u 40 •— <br /> 3 —0 Nf-I4 -N in effluent ol'T2 (C:N=2:1) <br /> —A NII,•-N in ei'lluent ot'T3 (C:N=5:1) 35 0 <br /> 2NH '-N in influent <br /> 30 <br /> U 1 U <br /> z 25 z <br /> o <br /> z — 207 <br /> -1 15 <br /> 0 5 10 15 20 25 30 35 40 45 50 <br /> Time (d) <br /> a <br /> 52 <br /> 48 <br /> 44 <br /> 40 <br /> c) 36 <br /> 32 —f—NO,--N in effluent of"l'I (control) <br /> 28 —♦—NO ,-N in effluent of T2 (C:N=2:1) <br /> 24 Nt);.-N in effluent of T3 (( :N=5:1) <br /> e� <br /> U 20 fir NO,-N in influent <br /> 0 <br /> U 16 <br /> z _ <br /> 12 <br /> O 1 1 i <br /> z 8 <br /> 4 <br /> 0 <br /> Open in a separate window <br /> Figure 4 <br /> Overall ammonium and nitrate concentrations of a modeled two-stage CRI over time. (a) Absolute <br /> concentrations of NH4--N in first-stage influent and in the second-stage efflucut of the three experimental <br /> setups; (b)The nitrate concentration in influent of the first stage and in the effluent of the second stage in <br /> the three experimental setups. <br /> https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6069465/ 8/18 <br />