| Formula |
Math Toolbox Example |
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Mass Load (kg/day) = Flow {MGD} x Concentration {mg/L} x 3.785 |
V6 * V46 * 8.34
Where: V6 is flow in MGD,
V46 is concentration in mg/L |
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V452 / V450 * 1000
Where: V452 is 30 min settleometer, V450 is MLSS
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V102/V460
Where: V102 is BOD primary effluent lbs, V460 is MLSS lbs |
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V460 / V101
Where: V460 is MLSS lbs, V101 is TSS lbs in primary effluent |
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V460 / ( (V350 * V351 * 8.34) + (V131 * V101 * 8.34))
Where: V460=MLSS lbs, V350= WAS Flow (MGD), V351 = RAS/WAS SS {mg/L} V131= Eff TSS {mg/L}, V101=Effluent Flow {MGD}
Note: Typically SRT does not include the Solids in the Secondary Clarifiers
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Method #1 |
(V460+V413) / (V399+V132)
Where: V460=MLSS lbs, V413=secondary clarifier lbs, V399=WAS lbs, V132=effluent TSS lbs |
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Method #2 |
(V461*2.5*8.34) / (( V350*V352*8.34) + (V132*V101*8.34)
Where: V461 = MLVSS, 2.5 Vol of Aeration in MG, V350 = WAS Flow (MGD), V352 RAS/WAS VSS (mg/L)V132 = Eff VSS (mg/L), V101 = Eff Flow (MGD)
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V399/(V102-V131)
Where: V399=WAS lbs, V102= BOD primary effluent lbs, V131= BOD effluent lbs |
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(V50*8.34*V2)/0.167
Where: V50=Influent BOD, V2=Influent flow |
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1.8 * V92 + 32
Where: V92 is Influent Water Temperature {C} |
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(V91 -32) / 1.8
Where: V91 is Influent Water Temperature {F} |
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V2 * 0.00144
Where: V2 is Flow {GPM} |
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(1.23*7.48*24) / V7
Where:
1.23 is Tank Volume in Cu Ft
7.48 is gal/Cu Ft
24 is hours in day
V7 is Flow in gals/day |
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(V1021*1.23*8.34) - (V11 * V1 * 8.34) / V1071
Where:
V1021 = MLSS
1.23 = Aeration Volume
8.34 = lbs/gal
V11 = Inf BOD
V1 = Inf Flow
V1071 = Target F:M |
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See calculating percent removal for more information on percent removal calculations. |
(V11 - V4011) / V11 * 100
Where:
V11=Inf BOD
V4011=Eff BOD |
| Solids Loading Rate in lbs/sqft = MLSS{mg/L} X (Inf Flow{MGD} + RAS FLow{MGD}) X 8.34{lbs/gal} / Clarifier Surface are in Sq Ft |
(V1021 (V1+V1001)8.34) / V4065
Where:
V1021 = MLSS
V1 = Inf Flow
V1001=Ras Flow
8.34 = lbs/gal
V4065 = Clarifier Surface area in Sqft |
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V14 / 890
V14 = Flow in gpd
890 = Surface area in SqFt |
| Chlorine Demand in mg/L = Chlorine Dose{mg/L} - Chlorine Residual{mg/L} |
V4062 - V4063
Where:
V4062 = Chlorine Dose
V4063 = Chlorine Residual |
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Horizontal Tank Volume (with flat ends) in gallons
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((44^2 * ((ARCCOS((44-V206)/44))*(3.14159/180))-(44-V206) *(2*44*V206-V206^2)^0.5)*177)*7.4805/1728
Where:
44 is tank radius (inches)
177 is tank length (inches)
V206 is depth of liquid (inches) |
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Lab: Seeded BOD {mg/L} = (Initial DO{mg/L} - Final Do{mg/L}) - (Initial Seed Control DO{mg/L} - Final Seed Control DO{mg/L}) X Volume of Seed Added{mg/L} / Sample Volume {mL/bottle volume mL}
* Volume of Seed added is Seed Material that has been added directly to sample or to seed control bottles |
(V4013-V4014)-(V4023-V4024) * 2 / 300
Where:
V4013= Eff BOD Initial DO
V4014= Eff BOD Final DO
V4023=Seed Control Sample Intial DO
V4024=Seed Control Sample Final DO
2= Volume of Seed added
300 = mL / bottle |
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Lab: Suspended Solids in {SS} mg/L = Weight of Filtered dry Solids{mg} - Weight of the filter{mg} / Sample volume{ml}X 1000000
* See Custom Data Entry TSS Bench Sheet |
1.08752 - 1.06619 / 100 * 1000000
Where:
1.08752 = Weight of Filter Dry and Tara Weight
1.06619 = Tara weight
100 = amount of Sample in mililiters
1000000 = Liters |
| Lab: Volatile Suspended Solids {VSS} mg/L = Weight of filter and Dry Solids{mg} - Weight of Filter and Ash{mg} / Sample volume {ml} * 1000000 |
1.08750 - 1.0687 / 100 *1000000
Where:
1.08750 = Weight of Filter Dry and Dry Solids
1.0687 = Weight of Filter and Ash
100 = amount of Sample in mililiters
1000000 = Liters |
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Langelier Saturation Index = pH - pHs
where pHs = (9.3 + A + B) - (C + D)
Where:
A = (Log 10 [TDS] - 1) / 10
B = -13.12 x Log10 (oC + 273) + 34.55
C = Log10 [Ca2+ as CaCO3] - 0.4
D = Log10 [alkalinity as CaCO3]
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V101 = LSI(V102,V103,V104,V105,V106)
Where:
V102: is the measured water pH
V103: is the TDS
V104: is the Temperature in Deg C
V105: is the Hardness in mg/L
V106: is the Alkalinity in mg/L
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