14.- WSP Design Summary (3)

# Note gm3 design loading is a function of temperature

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Unformatted text preview: m3/day A /day = pond area, m2 NOTE UNITS! NOTE [*= g/m3] [*= Design loading is a function of temperature: temperature GLOBAL DESIGN EQUATION GLOBAL λs = 350(1.107 − 0.002T)T−25 350(1.107 Note: 25 °C 25 Based on: (a) T = 8 °C, λs = 80 kg/ha day [experience in Europe & NZ] (b) T = 25 °C, λs = 350 kg/ha day [experience in NE Brazil] Facultative Pond Design PROCEDURE PROCEDURE 1. Calculate area from BOD loading [ = f(T)] area 2. Choose depth (~1.5 m) depth 3. Calculate retention time, taking net evapretention net oration into account − see → 4. Calculate unfiltered effluent BOD from unfiltered first-order equation (k1 = 0.1 day−1) − see → 5. Calculate filtered effluent BOD ( = 0.3 × filtered unfiltered BOD) EVAPORATION e = net evaporation net = evaporation – rainfall, mm/day NB: Met. stations report mm/month...
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