Elementary Surveying (14th Edition)
Elementary Surveying (14th Edition)
14th Edition
ISBN: 9780133758887
Author: Charles D. Ghilani, Paul R. Wolf
Publisher: PEARSON
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Chapter 2, Problem 2.24P
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When should sketches be made instead of just recording data?

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Land Use Hydrologic Area (acres) Soil Group A 25 Forestland-orchards B 30 B 45 Forest Oak-Aspen C 60 A 80 Open Spaces B 65 A 120 Residential (1/2-acre lots) B 155 Storm Hyetograph Time Rainfall Interval Intensity (hours) (in/hr) 0-1 1.2 1-2 1.3 2-3 1.9 3-4 1.5 4-5 1.3 5-6 1 6-7 0.8 1 Hour-Unit Hydrograph Time UH [hr] [cfs/in] 0 0 1 60 2 120 3 140 4 80 5 40 6 10 7 0
Secondary Treatment Based on a plant flow rate of 40 mgd, design an activated sludge, secondary treatment system with recycle which maintains a MLVSS = 2,000 mg/L in the aeration reactor and has an average Solids Retention Time (SRT) = 4 days. The biota kinetic constants are: Kinetic Coefficients for the Activated-sludge Process for the Removal of Organic Matter from Domestic Wastewater - Endogenous Decay Coefficient – k(d) Half-velocity constant – K(s) 0.1 15 Max. Specific Substrate Utilization Rate – k Biomass Yield - Y 6 0.45 gVSS/gVSS-day mg/L bsCOD g bsCOD/gVSS-day gVSS/g bsCOD used The laboratory has provided the information below for your influent from your primary clarifier. Unit mg/L Item Influent nbVSS - Xo Quantity 30 Fraction of the biomass which remains as cell debris (fd) Temperature 0.18 20 °C Quantity of Oxygen in air 0.017 Lb O₂/ft³ air Influent microorganism & substrate concentration as (So) Influent Inert Inorganics (TSS. – VSS.) 215 10 Mg/L bsCOD mg/L Aeration Basin…
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