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by: Lina Vandervort


Lina Vandervort

GPA 3.72

Joann Silverstein

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About this Document

Joann Silverstein
Class Notes
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Popular in Civil Engineering

This 2 page Class Notes was uploaded by Lina Vandervort on Thursday October 29, 2015. The Class Notes belongs to CVEN 5534 at University of Colorado at Boulder taught by Joann Silverstein in Fall. Since its upload, it has received 24 views. For similar materials see /class/231881/cven-5534-university-of-colorado-at-boulder in Civil Engineering at University of Colorado at Boulder.




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Date Created: 10/29/15
EXAlVlPLE DESIGN OF CSTR WITH BIOMASS RECYCLE Oxygen supply is an important constraint for process design 0 Oxygen transfer through conventional aeration devices is limited with 1000 gOzm3d to be assumed to be a maximum rate of oxygen supply 0 Aeration Via compressed air supplied by mechanical blowers bubble or turbines is costly especially in terms of energy consumption Purpose of this example develop a CSTRbiomass recycle process to minimize plant size while maintaining oxygen requirement lt 1000 gOzm3d Given sSO 250 gm3 COD SS 5 10 gm3 COD discharge permit sNHO 40 gm3 NH4N sNH 05 gm3 NH4N Kinetic and stoichiometric data llH 4d 1 llA 1d 1 KS 25 gm3 COD KNH 3 gm3 NH4N b 005 d391 for both heterotrophs and nitrifiers YH 064 gheterotrophic cell CODgsubstrate COD YA 012 g autotrophic cell CODg NH4N fD 02 gdebris CODgbiomass COD decayed lNXB lNXD g NH4Ngcell A s HH HH KS SS quot sNH HA 2 HA K NH 8NH assume XBA ltlt XBH and nitrogen synthesis requirement to autotrophs can be neglected 1 Relation between G and SS and SNH For O gt 05 d discharge permit for COD is satisfied For 9 gt 11 d discharge permit for ammonianitrogen is satis ed 2 Relation between G and XBH Recall that the product XBH E function of O and decreases as O increases Also products X1317 and XT E both increase as O increases 3 OXYGEN CONSTRAINT for design of CSTR r0 ROV 1000 gOzm3d Note that minimum volume of CSTR is achieved at minimum 1 1min for COD oxidation only 1 r Sso SS1 YHOBS Omax 13min and Xmax XI 1min where X1 Xr 4 Other constraints 3 days lt O XT gt 1500 gm3 COD 5 Adding nitrification I Oymax 1 1min Sso Ss1 YHOBS 457 SNHO SNH 1NXBYHobsSso Ss 6 Note that wasting rate observed yield and nitrogen synthesis requirements all decrease as O increases


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