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11 Pages

### aerator-perf

Course: PAPR 3531, Fall 2008
School: Western Michigan
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Word Count: 461

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Field Aerator Capacity Design parameter Design Parameter Designers must choose equipment based on: - O2 requirement - capital costs - operating costs - non-economic factors Therefore, she/he must know the field oxygen transfer capacity. Usually expressed as: lb O2 / hp hr or Kg O2 / Kwh Manufacturers usually supply transfer capacity for their equipment under standard conditions (1 atm, air, 20 C=0) i n tap...

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Field Aerator Capacity Design parameter Design Parameter Designers must choose equipment based on: - O2 requirement - capital costs - operating costs - non-economic factors Therefore, she/he must know the field oxygen transfer capacity. Usually expressed as: lb O2 / hp hr or Kg O2 / Kwh Manufacturers usually supply transfer capacity for their equipment under standard conditions (1 atm, air, 20 C=0) i n tap water. C, Designers must correct this stated capacity to that expected in the field conditions. M&E presents Eqn, 5-62, p. 447, for this correction. C Walt C N = No 9 . 17 L 1 . 024 T 20 Where: N = lb O2/hp-hr in the field No = lb O2/hp-hr in water at 20C, C = 0 = salinity-surface tension factor Cwalt = O2 saturation conc. for tap water at temp., alt. CS20 = O2 saturation conc. for tap water at 20C CL = operating O2 conc. T = temp C = O2 transfer coeff. for waste (M&E, Table 5-32) However, O2 saturation is outdated , so : CWalt C L 1.024T 20 N = No CS 20 CS20 = 9.08 (from M&E, App. D) Equation 5-62 is derived as follows: dC A = K L (CS Ct ) = K L a (CS Ct ) dt V Where: Kla = overall mass transfer coeff. CS = saturation conc. in soln. Ct = conc. at time t Eqn. 4 30 Correct K standard L a * for waste compositio n K L a = ( K L a*) = K L a ( waste) K L a (test ) * denotes standard test conditions -Correct standard Kla* for temperature K L a = ( K L a*) T T20 -Correct CS* for temperature using Henrys Law -Correct CS* for altitude (pressure) using Fig. 5-68, p 447 Corrected CS * = Cwalt water temperature altitude -Correct for difference in saturation between tap water and wastewater C S ( waste ) = C S (tap ) (same T, P) CWalt C L 1.024T 20 N = No CS 20 Eqn. 5-62, p 447 A more sophisticated equation: Eqn. 5-55, p. 429 Cs ,T , H CL (1.024T 20 )( )( F ) AOTR = SOTR Cs , 20 Where: AOTR = actual oxygen transfer rate under field conditions, kg/O2/h SOTR = standard oxygen tra...

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Western Michigan - PAPR - 3531
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