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项目七. 发酵工业中氧的供需. 项目内容. 一、 细胞对氧的需求 ( 为什么要供氧?为什么要 控制溶氧?) 二、 发酵过程中氧的传递 (如何实现供氧?如何控制溶氧?) 三、 影响氧传递的因素 四、 摄氧率、溶解氧 、 K L a 的测定. 一、细胞对氧的需求. (一) 氧在微生物发酵中的作用 (二) 可利用氧的特征 (二) 微生物的耗氧特征 (四) 溶解氧控制的意义. (一)氧在微生物发酵中的作用 (对于好气性微生物而言). 呼吸作用 直接参与一些生物合成反应. (二)可利用氧的特征. 只有溶解状态的氧才能被微生物利用。.

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项目七

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4105413


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(

KLa


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1.

(1)QO2

mmolO2/kgh

(2)

=QO2x xkg()/m3


2 q o2 c l

2. QO2CL

(1) CL>Ccr QO2 (QO2)m

(2) CL< Ccr

k0

mol/m3

k0 k0 QO2

  • k0


3 c cr

(3) Ccr

  • Ccr

  • CL> CcrQO2

  • CL< Ccr QO2


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CCr:115%

4.6*10-3 mmol.L-1, 1.8%

2.2*10-2 mmolL-1, 8.8%

/

>1.


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3.

  • QO2x

  • (QO2 )mx

    C. m, QO2< (QO2 )m x<xm


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D. S, OTR, QO2

(QO2 ,x , OTR),x=xm,QO2OTR

E.S0QO2 ,


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4.

  • k0QO2

    • >>>

    • , QO2 ; , QO2

  • :QO2,QO2


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4.

  • pH ;

    T , DO2

  • ()

    TCA,QO2,

    EMP,QO2,


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  • ,,,,,


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1.

2.

3.

4.


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()


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1.


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KLa


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  • 1/kG

  • 1/kI

  • 1/kL

  • 1/kLB

  • 1/kLC

  • 1/kIS

  • 1/kA

  • 1/kW

  • 1/kR


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(1)()


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(2)

  • nO2

    PPiMPa

    CLCi

    kG

    kLm/h


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  • KG

    KL m/s

    P*CPa

    C*Pmol/m3


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  • H


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H

,


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3.

  • KLa


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OTR

KLa

h-1,s-1

KGa,


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4.

  • :


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  • DaDamkhler

  • Da1

  • Da1

  • C*k0(QO2)m

  • ,


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,

yx,


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  • kLa,


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  • :

  • ,


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1. C*-CL

a

kL

2. kLa


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1)

  • 1.01105Pa433:

    t,

    T Cw*


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2)

  • 1)

    Ce*,mol/m3

    Cw*, mol/m3

    CE,kmol/m3

    KSechenov,,.


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2)

2

hii, m3/kmol

, kmol/m3

Zii,

i, kmol/m3


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2)

B.

Cn*, mol/m3

CN,kg/m3

kSechenov, m3/kg


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2)

C.(+):

Cm*,mol/m3

Cm*


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3)

  • ;


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4)


K l a

KLa

Ws

NPG

VHL


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KLa

  • dm ; s-1 ;

  • kg/m3;Pas ;

  • DL, m2/s ; N/m;

  • Wsm/s ; g, 9.81m/s2


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  • ()


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KLa

0.06

KLa=0.06


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d DLgKLa


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  • NWsKLa

  • KLaKNWs

  • KLa

  • NWsKLa


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  • NKLa

  • PG/ VN(WsN).


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  • PG:

  • PRem:

  • Rem10 x=-1

  • Rem104 x=0

P

PG:


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PGPNa:

Na0.035PG/P=1-12.6Na

Na0.035PG/P= 0.62-1.85Na

, PGNWsd


A k l a

A. KLa

  • NPG KLa

  • (KLa)

    • aKLa

    • 1/KLKLKLa


K l a1

KLa

  • N

    PG,,

N


B k l a

B. KLa:

  • Q, QWs KLa


C k l a

C. KLa

  • ,PG, Ws, KLa, Ws,

    Ws(Ws)m, Ws

    PG,PG.

    Ws(Ws)m PG KLa

Rem=


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C. KLa

  • , , , , PG,KLa

  • QNPG

  • KLa


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KLa


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A.

  • : 9L=0.95

    500L=0.67

    27T54T=0.50

, ,KLa.


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B. :

  • 20T: =0.72, =0.11


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C. :

  • :>>

  • :>>

  • :>>

    : >>

    KLa.


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A.

, 1/kL, kL

, a

,a, KLa

, kL, KLa

kLaKLa

KLa


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NaLSO4KLaKLda


B k l a1

B. KLa

  • ,,a, KLa;

  • ,,a, KLa

    (KLa),C*E.IKLa,,k.

  • I=00.4, =0.40+0.862I/(0.274+I), I,k. I>0.4, =0.9, k.

  • II0.35 ~0.39.


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C.

  • xKLa()

KLa


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  • 1kg O2/kg O2)

    • 1kg O2


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  • Na2SO3

    • KLa


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CL


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1

  • KIH2SO4, Na2S2O3

    MnSO4+2NaOH Mn(OH)2Na2SO4

    2Mn(OH)2+O2MnO(OH)2

    MnO(OH)2+Mn(OH)2MnMnO3+2H2O

    MnMnO3+3H2SO4+2KI2MnSO4+I2+3H2O+H2SO4

    I2+2Na2S2O32NaINa2S4O6


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1


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2

  • 0.8V

  • O2+2H++2e H2O2

    O22H2O +2e H2O22OH


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2


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3

  • no2=kL(PL-P1)=km(P1-P2)=ke(P2-Pc)=K(PL-Pc)

    Faraday

    i=4FAno2= 4FAK(PL-Pc)=KPL


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a b


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1


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2


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3

CL>Ccr


K l a2

KLa


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1

    • 0.0180.5kmol/m32045

    • Na2SO3OTR, OTR=KLaC*KLa

      2Na2SO3+O22Na2SO4

      H2O+Na2SO3+I2Na2SO4+2HI

      2Na2S2O3+ I2Na2S4O6+2NaI


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1

  • Kd


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1

    • 4-80L

    • Na2SO3


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2

    • 0.61.0V

    • KLa

  • QO2


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(3)


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4

  • KLa


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  • t1, C1 C2, =QO2x=

  • t2 C2 C1

  • CL 1/KLa, CL

  • C*.


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KLaC*


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4


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5

  • 0.1mol/LKClCLCLtC*.

    t KLa=-2.303


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5

    • CKLa


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6

  • KLa


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  • KLa

  • KLa


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