A town with a sewer population of4,000 has a daily wastewater flow,including industrial wastewaters of1,600 m³ and an average BOD of280 mg per liter. The industrialdischarges to the municipal sewersare 60 m³ at 1,800 mg per literBOD from a meat processing plantand 100 m³ at 400 mg per literBOD from a soap canning plant.Determine the contribution ofdomestic flow in liters per personand the BOD in grams per personbased on the town's wastewater,excluding the industrialwastewater.

The objective of the question is to determine the contribution of domestic flow in liters per person…

Answered: A town with a sewer population of 4,000…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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5. You are asked to design a single media filtration system for a drinking water facility. The design flow rate is 20 mgd (million gallons per day). The ideal filter velocity for your system is 8 m/hr. You design a set of filters to be used in parallel. Each filter box has a surface area of 50 m². a. How many filters do you need to construct? b. Estimate the (clean-filter) head loss in kPa? c. What mass removal (filter efficiency) would you expect for an influent stream that contains equal parts (by mass) of 1, 10 and 100 um particles? You can assume an adhesion efficiency a = 0.7. Sand Effective Size (mm) 0.8 Uniformity Coefficient 1.2 Grain Porosity Density (g/cm³) 2.6 0.4 Layer Thickness (m) 1.5
A city wishes to discharge wastewater primary effluent to a river which supports a trout. The state requires the city to show that the trout population is protected. Trout require a minimum of 4 mg/l of dissolved oxygen to survive. Determine the minimum downstream dissolved oxygen concentration from the following information about the wastewater discharge and river. Does the minimum dissolved oxygen concentration meet the requirements? Wastewater discharge=0.45m3/s, river flow rate= 8.5 m3/s, river cross-sectional area=19m2, dissolved Oxygen concentration in the wastewater= 0.2mg/l, dissolved oxygen content of the river upstream = 8.1mg/l, saturation dissolved oxygen concentration at 20 C= 9.0 mg/l, BOD concentration in wastewater = 85 mg/l, BOD concentration upstream in the river= 0.2 mg/l, BOD decay constant = 0.2 d-1, and the reaeration constant for the river= 0.4 d-1.
An industry generates 4 million gallons per day (MGD) (that is 15,000 m^3/ day) of liquid industrial wastewater having BOD5 of 1000 mg/L and first order reaction rate constant of 2.0/day. Because of the high BOD, there is a plan to build an industrial pre-treatment system at an industrial park. Effluent from the pre-treatment will be discharged into the city sewer for final polishing at the city wastewater treatment plant. Determine: a. Percent BOD removal if the wastewater is treated in one 5000 m^3 continous flow stirred tank reactor. b. Percent BOD removal if the wastewater is treated in one 5000 m^3 plug flow reactor. c. Percent BOD removal if the wastewater is treated in one 2500 m^3 continous flow stirred tank reactor followed by one 2500 m^3 plug flow reactor. d. Percent BOD removal if the wastewater is treated in one 2500 m^3 plug flow reactor followed by one 2500 m^3 continous flow stirred tank reactor. e. Percent BOD removal if the wastewater is treated in one 2500 m^3…
A city of 20,000 people disposes of 1.05 m3/s of treated sewage that still has an ultimate BOD of 28.0 mg/L and 1.8 mg/L DO into a river. Upstream from the outfall, the river has a flow rate of 7.08 m3/s and a velocity of 0.37 m/s. At this point, the ultimate BOD and the DO in the river are 3.6 and 7.6 mg/L, respectively. The saturation value of DO (at the temperature of the river) is 8.5 mg/L. The deoxygenation coefficient is 0.61/day, and the reaeration coefficient is 0.76/day. Assume complete mixing and the velocity in the river is the same upstream and downstream of the outfall. What is the oxygen deficit and the ultimate BOD just downstream from the outfall (just after mixing, before any reaction can occur)?
You are constructing a sewage lagoon with a 3,100 m3/day inlet/outlet flow rate. You must attain a BOD outflow load of 12 mg/L given a BOD inlet load of 26 mg/L. BOD has a half-life of 2.4 days.What volume is needed for the lagoon and how long would it take for the output BOD concentration to reach 1 ppm if freshwater started to replace the wastewater that was previously entering the lagoon?
The average domestic wastewater flow is 108 gallon per capita per day (gpcpd), containing TSS concentrations in wastewater of 244 mg/L. How many pounds of TSS produced per capita per day.

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