Sf

Equivalents or equivalents per liter of Nitrosomonas produced from one equivalent or one equivalent per liter of NH4-N based on Equation (18.15)

The number offaradays or moles of electrons involved in a reaction; equivalents or equivalents per liter of Nitrobacter cells produced based on Equation (18.22) per equivalent or equivalent per liter of NH4-N based on Equation (18.15)

Equivalents or equivalents per liter of NO3-N, based on the NO-acceptor reaction, destroyed in the denitrification step Millimoles per liter of nitrate nitrogen destroyed in the normal anoxic denitrification stage

Total milligram moles per liter of nitrate nitrogen produced in nitrification

Pressure

Equivalents or equivalents per liter of cells, based on the synthesis reaction, produced during the last stage of the aerobic reaction

Influent flow to the process from the effluent of the primary clarifier

Heat exchange between system and surroundings at constant presure

Recycle flow from the secondary clarifier

Heat exchange between system and surroundings in a reversible process

Underflow rate of flow from the secondary clarifier Rate of flow of sludge wasting

Equivalents or equivalents per liter of O2, based on the oxygen acceptor reaction, used in the heterotrophic stage of the denitrifi-cation reaction

Millimoles per liter of dissolved oxygen left after the aeration is cut off

Equivalents or equivalents per liter of cells, based on the synthesis reaction, produced during the regular anoxic denitrification reaction Entropy mg/L of substrate remaining after consumption by organisms in the reactor

Entropy at beginning of process mg/L of the carbon source influent to reactor mg/L of the carbon source in reactor

Limiting value of [Sc]

Entropy at end of process

Milligram moles per liter of sewage needed in the denitrification process

Milligram moles per liter of sewage required in nitrification Safety factor mg/L of ammonia nitrogen in reactor

Limit concentration of [SNH ]

mg/L of ammonia nitrogen influent to the reactor mg/L of nitrate nitrogen in reactor n

[ SNO o ] mg/L of nitrate nitrogen influent to the reactor

[So] Substrate remaining after settling in the primary clarifier, mg/L

[ SO ] mg/L of dissolved oxygen t Equivalents or equivalents per liter of NO2-N, based on the NO-

acceptor reaction, utilized in the nitrite reduction stage of the denitrification; time of reaction t Milligram moles per liter of nitrite nitrogen utilized in the nitrite reduction stage of the denitrification process equals the milligram moles per liter of nitrite nitrogen appearing after the nitrification step

T Temperature u Equivalents or equivalents per liter of cells, based on the synthesis reaction, produced in the nitrite reduction stage U Internal energy; specific substrate utilization rate, per day

V Volume of reactor considered equal to the volume of control volume

V carbnit Volume of activated sludge reactor

V denu Volume of reactor based on denitrification reaction W Work done by system on surroundings

[X] Milligram per liter of mixed population of microorganisms utiliz ing organic waste.

[Xe] Milligrams per liter of organisms exiting from the secondary clarifier

[Xo] Influent mass concentration of microorganisms to the reactor, mg/L

[Xne] mg/L of nitrifiers at effluent of secondary clarifier

[Xnu] mg/L of nitrifiers at underflow of secondary clarifier

[Xn] mg/L nitrifiers in reactor

[Xu] Underflow mass concentration of organisms from the secondary clarifier, mg/L

V Specific yield of organisms

Yc Heterotrophic cell yield in moles per unit mole of sewage

V BOD Cell yield of heterotrophs, moles of cells per mole of BOD5 Ycod Cell yield of heterotrophs, moles of cells per mole of COD Ydn Cell yield of denitrifiers in moles per unit moles of NO3-N

Ydc Cell yield of carbonaceous anaerobic cells in moles per unit moles of sewage with nitrite as electron acceptor p Specific growth rate of mixed population of organisms, per day pc Specific growth rate of heterotrophs, per day pcm Maximum pc pdn Specific growth rate of denitrifiers

Pdnm Maximum Pdn pm Maximum p pn Specific growth of nitrifiers, per day pnm Maximum pn

6cc 6c of heterotrophs, per day

Qcn Mean cell retention time (MCRT) for the nitrifiers

Qcdn Mean cell retention time (MCRT) for the denitrifiers

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