SU0002246 SSNL - Laserfiche WebLink

Home Browse Search

Technical Description Oxygen is essential for the growth of nitrifiers, and alkalinity consumption is important because nitrifying organisms are efficient only over a relatively narrow pH range. The third parameter, biomass production, is important to the understanding of microbial population dynamics. The low cell production frequently causes washout of nitrifiers in combined carbon-nitrogen oxi- dation systems without high sludge age. The Nitro-Raptor batch process assures that washout is less likely to occur than in a conventional flowthrough system or process due to the design of the hydraulic control. Compared to heterotrophic oxidation of carbonaceous waste material, nitrification generates rela- tively little biomass. Therefore, additional solids capacity for nitrogenous processing beyond those allocations given for the heterotrophic process is not required. The Nitro-Raptor batch system removes an average 96.8%of nitrates. (NOTE.•By increasing detention time from 14 to 16 hours,the process begins to run out the right side of the growth curve. This additional detention time utilizes Oz demand for further conver- sion of NH,to NO3.) Samples of MLSS are pulled from the ML entering the clarifier. Formula: F:M = Influent BOD, lbs/dav (6) Solids in aeration, lbs Example: Calculate the F:M_ _ Assumptions: Q=0.075 MGD Aeration tank volume,V=0.050 MGD BOD; = 125 mg/L MLVSS = 1600 mg/L F = Influent BOD 5 = (BODS)(Q,MGD) (8.34 lbslry (125)(0.075)(8.34) 78.18 lbs/day m = Solids inventory in aeration tank = MLVDD mg/L)(V, MGD) (8.34 lbs/gal) = (1600) (0.050) (8.34) = 667.2 lbs F:M = 78.18 BODJday 667.2 lbs MLVSS = 0.11 lbs BODS/day/lb MLVSS Extended aeration detention sizing: Fxh = C H1 where - ts 7-H Technical Services Group,Inc.