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환경시스템 ch6 PowerPoint PPT Presentation


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환경시스템 ch6. 20051477 유가영. 1. 하천의 물질이동식을 유속만 있는 경우와 분산이 있는 경우에 대하여 유도하라 . (BOD 및 용존 산소에 대하여 ). 일평균최소허용농도의 수질 기준을 만족하기 위해서는 비정상상태의 수질농도의 해가 필요하므로 다음과 같은 용존산소에 대한 물질이동식을 고려한다. 용존산소 농도의 주간 변화량.

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환경시스템 ch6

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Ch6

ch6

20051477


1 bod

1. . (BOD ).

  • .

  • ka (T-1), Cs (ML-3), kd CBOD (T-1), kn NBOD (T-1), L(x) CBOD (ML-3), N(x) NBOD (ML-3), P(x,t) (ML-3T-1), R(x) (ML-3T-1), S(x) (ML-2T-1), H (L) .


Ch6

  • . . , . , .

  • . t=0 .

  • . P(t) sine .


Ch6

  • Pm (mg L-1 d-1), ts (d), f ( ).

  • , Fourier . n cycle number.

  • Fourier . T (0.5).


Ch6

  • Fourier . Fourier

    .

  • 7-8 ( ).

  • 4 .

  • Pm .

  • , , .

  • Fourier A0=16.16, A1=0.575, A2=-0.1, B1=-1.025, B2=0.0 .

  • Fourier , .

  • , , , , , .


Ch6

6.5


Ch6

6.10

(a)x=1.6mi

(b) x=2.7mi

(c) x=6.8mi


2 streeter phelps

2. Streeter-Phelps .

  • 1925, Streeter and Phelps, , sag curve, BOD ,

  • L BOD (ML-3), u (LT-1), kd 1 ( ) (T-1)


Ch6

  • C (ML-3); L BOD (ML-3); Cs (ML-3); ka 1 (T-1)


Ch6

  • .

  • , q(t) .


Ch6

6.3 Streeter-Phelps D.O. Sag Curve.

: BOD .

: D.O. , .

: D.O. sag curve xc.


Ch6

3. .

  • D.O. . Fair and Geyer (ka/kd) .

  • BOD(L0) . BOD , xc . x=0 BOD L0 .


Ch6

  • BOD5 (5-day BOD) 1.47 BODU .

  • W (MT-1), W .

  • , - . w , s .


Ch6

  • .

    1. .

    2. . , .

    3. .

  • (Arrhenius, 1889). . Ea , R , T , A .

  • 1.048, 1.024. Dc ( 6.4b).

  • , (Cs-C) (C) .


Ch6

6.4 (Dc) (W), (T), (Q), (D0) .


Ch6

    • BOD L0 . L0=W/Q.

    • .

  • , , . , a = 0.4-0.7, b = 0.3-0.5, c = 0-0.25 .


Ch6

5. .

  • Streeter-Phelps NBOD, SOD, (P-R), DO .

  • .

  • 6.6 DO . DO , DO . (R>P) .

  • .

  • L N .


Ch6

6.6 DO (D) . CBOD (L), (kn) NBOD, (kd), (ka), CBOD (ks), (P-R), SOD (S).


Ch6

  • .

    • ,

    • CBOD(L0),

    • NBOD(N0),

    • SOD(S0),

    • (R-P),

    • BOD(Lb) .


Ch6

6.4 /


Ch6

6.7 / DO


6 fourier

6. Fourier

  • , , , . .


Ch6

  • 1925 Streeter-Phelps DO . .

  • Thomas(1948) Camp (1963) . O'connor Ditoro(1962) Fourier DO , Yeh(1973) BOD DO 1 . HEC(Hydrologic Engineering Center, 1978) WQRRS , , simulation .


Ch6

  • EPA (1985) Qual2 Qual2E , , , , , Qual2 , , 15 - (steady- state) PC .

  • 1 , , , .


7 6 6

7. 6 6 ( ).

6.6


Ch6

  • .

    • .

    • ( ).

    • .

    • (, , ).

  • . , .

  • , , . .

  • , , Monte Carlo .


First order reactions

8. 1,2 , .

(First-Order Reactions)

  • . , 1 .

  • 1 1 .


Ch6

. 1 .

(17) (18)

(17) , ( 3.4) . (18) A .


Ch6

, (16) , (A B) . (18) A (16) .

(19)

  • (19) 1 .

    (20)

  • (18) (20) :


Ch6

(21)

(22)

  • 1 () . A , A .

    (23)

    (24)

    (25)

  • (24) . (25) .


Ch6

1 .

  • ()

  • ()

  • 1 . , 1 .


2 second order reactions

2( Second-Order Reactions )

2

  • 2

  • 1/A k2 .

  • 2 2 .

  • ln(A/B) -k2(B0 A0) .


Ch6

3.4 , ,


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