?? ?? .?? 4?? ???? Interpretationof experimental data relatedto wastewater treat

Question

?? ?? .?? 4?? ???? Interpretationof experimental data relatedto wastewater treatmert, Nremoval) The following table is a sturmmary of the effects of free anmonia (FA) and dissolved oxygen (DO) on ammoniun and nitrite oxidations by suspended and attached microbial cells. Based on these results, determine theoptimal conceritration ranges of (1) FAand 2 DO forthe highest.g, s, values (g., specific ammoria utilization rate de specifie nitrite utilization rate, VsSd voltile suspended solids day: N,nitrogen) Biological removal of nitrogen from wastewater is a ccomplished by mitnification and denitntication. During nitrification, anmmonia is converted to nitrite by ammonium oxidation and then nitrite to nitrate by nitrite oxidation Higher g value means higher accummilationof nitrite in wastewater FA (mg/L) DO (mg/L) 11.4 900 1.27 2.21p 2.49 2.370 2.36 1.34 226 15.73 104 ??» 50 100 6.44 6.0 5.54 4.4- 5-0 14 13.0 5.9 5124 Suspended cells 0.5e 4.5o 6.0 6.443 14.6 4.0 10" 2.5 15 8. 2.47 151 102 20 50 100 24.3 1965 1.752 1.85e i p. 2.00 2 09-e 1 855 20.1 11s 9.9 Attached cellso 42

Explanation / Answer

Hi,

From the table we can see that, the highest value of qa/qn for suspended cells is 2.49 which gives maximum FA = 10 mg/lit and DO = 5 mg/lit.

For the case of attached cells, the highest value of qa/qn observed is 1.96 which gives maximum FA = 20 mg/lit and DO =5 mg/lit.

But, if the process of denitrification is taken into account, then we can say,

From the table that, the highest value of qa/qn for suspended cells is 2.49 which gives maximum FA = 10 mg/lit and DO = 2.5 mg/lit.

For the case of attached cells, the highest value of qa/qn observed is 2.09 which gives maximum FA = 10 mg/lit and DO =1.5 mg/lit.

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