CVE 360 - Environmental EngineeringHomework 2AIUSAMERICAINTERNATIONAUNIVERSITProblem 1A wastewater treatment plant is required to disinfect its effluent before releasing treated wastewater intoa neighboring stream. An inflow concentration of a certain infectious germ in the wastewater is 25,000mg/L. A concentration of 2,000 mg/L is the highest concentration that can be released. It is suggested thatthe disinfection process employ a pipe that carries the effluent. The length of the pipe is 1000 m and thereaction rate constant is 0.1 min¹. Assume that the pipe behaves as a steady-state plug-flow system.Determinea) The residence time of this system (min)b) The speed of flow in this system (m/min)c) If the pipe has a diameter of 250 mm, determine the flow rate in the pipe (m³/hr)Cin 25000 mg/LL = 1000 mpipe=Cout 2000 mg/Lk = 0.1 min1

Step 1:a) To calculate the system's residence time, we can use the formula. Let us begin by…

Answered: CVE 360 - Environmental Engineering…

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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The preliminary stage in a wastewater treatment plant 1. Removes only large items that cannot be taken up in the biological process 2. Removes the large items to protect the plant equipment 3. Includes flow measurement devices to help in the control and operation of the biological stage 4. Normally produces significant BOD removal that aids in meeting regulatory restrictions O 2 and 3 O 4 O 1 1, 2, 3 Clear my choice
Q.` The wastewater having an organic concentration of 54 mg//is flowing at a steady rate of 0.8m³ /day through a detention tank of dimensions 2mx4mx 2m. If the contents of the tank are well mixed and the decay constant is 0.1 per day, the outlet concentration (in mg//, up to one decimal place) is
Q- Civil (Environment) An industrial waste water enters a stream having a BOD concentration of 10 mg/l and a flow of 20 m³/sec. If the flow of waste water is 1.5 m³/sec & its BOD concentration is 250 mg/1, then the BOD concentration in the stream at a point downstream of the point of confluence of waste water with the stream will be?
The wastewater from a manufacturing treatment plant is discharged to a municipal 'treatment plant for processing with domestic wastewater. The characteristics of the wastewater from the manufacturing treatment plant are 3500 mg/I BOD, 4500 mg/l SS, 70 mg/l nitrogen and 2 mg/l phosphorous. The characteristics of the domestic wastewater are 350 mg/l BOD, 285 mg/l SS, 50 mg/I N and 11 mg/l P. If the required BOD/N/P weight ratio is 100/5/1, what is the minimum quantity of domestic wastewater required per 1000 gallons of manufacturing wastewater to provide adequate nutrients for biological treatment and the concentration of SS in the combined wastewater?
The wastewater from a synthetic textile manufacturing plant is discharged to a municipal treatment plant for processing with domestic wastewater. The characteristics of the synthetic textile wastewater are 1500 mg/L BOD, 2000 mg/L SS, 30 mg/L nitrogen, and no phosphorus. The characteristics of the domestic wastewater are 200 mg/L BOD, 240 mg/L SS, 35 mg/L nitrogen, and 7 mg/L phosphorus. Find the BOD, SS of the mixture. The ratio of flow rate is domestic/textile = 4/1
The characteristics of the synthetic textile wastewater are 1500 mg/L BOD, 2000 mg/L SS, 30 mg/L nitrogen, and no phosphorus. The characteristics of the domestic wastewater are 200 mg/L BOD, 240 mg/L SS, 35 mg/L nitrogen, and 7 mg/L phosphorus. Find the nitrogen concentrations in the mixture. The ratio of flow rate is domestic/textile = 4/1
Problem 3: A manufacturer of beef sticks produces a wastewater flow of 2000 m'/day containing 120,000 mg/L salt. It is discharging into a river with a flow of 34,000 m'/day and a salt concentration of 50 mg/L. The regulatory agency has told the company to maintain a salt level of no greater than 250 mg/L downstream of the discharge. a. What recovery of salt must be accomplished in the plant before the waste is discharged? b. What could they do with the recovered salt? Suggest alternatives.
a. The wastewater from a manufacturing treatment plant is discharged to a municipal `treatment plant for processing with domestic wastewater. The characteristics of the wastewater from the manufacturing treatment plant are 3500 mg/l BOD, 4500 mg/l SS, 70 mg/l nitrogen and 2 mg/l phosphorous. The characteristics of the domestic wastewater are 350 mg/l BOD, 285 mg/l SS, 50 mg/l N and 11 mg/l P. If the required BOD/N/P weight ratio is 100/5/1, what is the minimum quantity of domestic wastewater required per 1000 gallons of manufacturing wastewater to provide adequate nutrients for biological treatment and the concentration of SS in the combined wastewater? b. What additional of NH4OH and H3PO4 would be required in pounds per million gallons of wastewater to provide the necessary nutrient levels for the treatment of the manufacturing wastewater described above (a) if the domestic wastewater had not been combined with it.
A wastewater flow of 10,000 m³/d containing 400 mg/L BOD5 is to be treated in a rotating biological contactor (RBC) system. To attain an effluent BOD5 of 20 mg/L (50% soluble), the overall surface loading will be 7.5 kg BOD5/1000 m²-d and the first-stage surface loading will be 45 kg BOD5/1000 m²-d. Determine the minimum total number of standard shafts (9300 m² surface area per shaft) needed for the RBC system.
5.a. Why is it important to remove oil and grease, and settleable solids from wastewater before the biological wastewater treatment process?b.The wastewater from a manufacturing treatment plant is discharged to a municipal `treatment plant for processing with domestic wastewater. The characteristics of the wastewater from the manufacturing treatment plant are 3500 mg/l BOD, 4500 mg/l SS, 70 mg/l nitrogen and 2 mg/l phosphorous. The characteristics of the domestic wastewater are 350 mg/l BOD, 285 mg/l SS, 50 mg/l N and 11 mg/l P. If the required BOD/N/P weight ratio is 100/5/1, what is the minimum quantity of domestic wastewater required per 1000 gallons of manufacturing wastewater to provide adequate nutrients for biological treatment and the concentration of SS in the combined wastewater? c.What additional of NH4OH and H3PO4 would be required in pounds per million gallons of wastewater to provide the necessary nutrient levels for the treatment of the manufacturing wastewater described…
If a manufacturing facility generates raw wastewater that is predominantly composed of dissolved and suspended solids and with ThOD of 100 mg/L, which of the following treatment equipment you could do away with? Check all that applies.
3 The high-purity-oxygen process illustrated in Figure 12.39 is being considered for treat- ment of an unsettled domestic wastewater flow of 1.40 mgd with an average BOD of 200 mg/l. Compute the aeration volume required based on a maximum allowable BOD load- ing of 130 lb/1000 ft³/day and minimum aeration period of 1.8 hr. For this system, what is the F/M ratio in terms of lb of BOD/day/lb of MLVSS, assuming an MLSS of 5500 mg/l, lotila?

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