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C The following Table illustrates the analytical test results obtained from the Flag City influent. TABLE 12 ANALYTE' ANALYSIS OF WASTEWATEI_INFLUENT: MOM THE FLAG CITY.-COMPLEX Ammonia Nitrogen(NH,-N) 57.6 mg/L i Organic Nitrogen 31.8 mg/L Nitrate BDL Nitrite BDL i Total Nitrogen 59,4 mg/L Total Suspended Solids(TSS). , 264 mg/L Biochemical Oxygen Demand(BODS) 244 mg/L _ t pH 7.6 Electrical Conductivity(E.C.) 1857 umhos/cm Total Alkalinity 641 mg1L Chloride _. 178 mg/L BDL-BeIow Detectable Limits 3.3 Calculation of Alkalinity Requirement for Nitrification Alkalinity in wastewater influent/e'Muent is derived from the domestic water supply, in addition to the introduction of wastes.=Nitrification'consumes approximately 7.1 mg of alkalinity for every milligram of ammonia-nitrogen (NH4--N) oxidized and since.the ammonia-nitrogen concentration can be considered high,-alkalinity requirements will be high. If there is insufficient .alkalinity, it may not buffer the pH during nitrification which reduces the performance of bacteria in removing BOD and ammonia. The denitrification process withn'the recirculating sand filter (RSF) may restore approximately one=half of the alkalinity lost in nitrification. This must be considered.in the RSF design parameters. Nitrification of-the Total Nitrogen concentration of 89.4 mg/L as analyzed above would require the following: 57.6 NH4-N x.7.1 mg.CaCO3 =410:mg/L alkalinity required. Alkalinity was determined to be 220 mg/L froni the on-site well in the 2006 report and 641 mg/L from the Flag City influent. Combining wastewater and domestic well water in equal-parts, may yield an alkalinity of approximately 431 mg/L:'.. Consequently, there may be sufficient alkalinity for �- nitrification to occur-in the RSF. Page-12- Chesney.Consulting