åãHÆåw HwÂŦHwČ zÂîÕHw
Xg[^[ĨtFvXĖÄCW k2ÆÍ Reaeration rate “k2” in Streeter [ Phelps Equation
nķ_fĖÏŧŪÆÄCW
Xg[^[ĨtFvXĖŪÍĪÍėŠL@ũĻLÅõģęÄnķ_f(DO O2(aq)ĖąÆĪŪÅÍCO2ÆĩÄĒé)Š0ÉČÁ―ãĪŽšÉ]ÁÄ\ĘĐįģęéO2ŠĪcŊ·éL@ũĻÉæÁÄDOŠģįÉÁïģęÂÂāĪæÉDOlŠãļĩĪÅIIÉÍL@ũĻŠ0ÆČÁÄĪDOŠOalÉßÃÆĒĪŪÅ·Ą
k1×LĖÍĪcŊ·éL@ũĻÉæÁÄDOŠģįÉÁïģęéąÆðĪk2(CO2sat- CO2)ĖÍ\ĘĐįģęéO2ĖąÆð\ĩÄĒÜ·Ąk2ðÄCWÆĒĒÜ·Ą
―ÆĶÎĪšLĖķĢÅÍĪĀŠlÅk2=0.5 h-1ðņĩÄĒÜ·(―Ï [25 cmĪŽš· 800 m)Ą
ę Sę(2005)nķ_fZxĖAąÏŠðpĒ―ĀąÍėÉĻŊéÄCW,ęķYŽxyŅÄzŽxĖč.Ī wG 66:93-105
k2=0.5 h-1ĖÓĄÍĪĒ1 h ―č50%ĢĖÓĄÅ·ĄPĘð min-1ÉÏ·ĩ―ûŠC[WŠíŦâ·ĒÅ·Ąk2=0.5/60=0.83% min-1Å·ĐįĪúlŠ0 mg/LĪOalŠ8 mg/LÅ ęÎĪ
1Šoßã 0 + (8 - 0) × 0.0083 =0.0664 mg/L
2Šoßã 0.0664 + (8 - 0.0664) × 0.0083 =0.1322 mg/L
3Šoßã 0.1322 + (8 - 0.1322) × 0.0083 =0.1975 mg/L
4Šoßã 0.1975 + (8 - 0.1975) × 0.0083 =0.2622 mg/L
ĨĨĨ
ðÍðÍĖĘčÅ·Ą
C(t) =8 ( 1- e-0.0083t) mg/L
Å·Ą
k2ÉÍ [ŠÖíčÜ·ĄCtÚGĘÏÆŧĖóÔĪ·ČíŋĪO2nŊÝŽxŠŊķÅ ęÎĪÍėŠóĒŲĮDOĖãļÍŽĪ[ĒŲĮDOĖãļÍxČčÜ·Ą
ąąÜÅĖbð1Ė}ÉÜÆßÜĩ―Ą
k2 ÄCW reaeration rate (āĩÍ reaeration coefficient)ÍĪĻŋÚŪeĘW kLaâĪĻŋÚŪ[ģkLæčāÃĪ1925NĖÄöOqķ|[gŠoTÅ·Ą
Streeter HW, Phelps EB (1925) A study of the pollution and natural purification of the Ohio river: III Factors concerned in the phenomena of oxidation and rearation. Public health bulletin No 146, United States public health service
(Ļíč)