A local plant has a pancake type disinfection tank. Diameter is 15 m and height is 6 m. Flow of filtered water is 43 m3/min. To meet EPA regulation, plant should achieve 3 log inactivation of Giardia Cyst at pH 8 and 20 degree Celsius. Currently plant uses chlorine as primary disinfectant. (*Answers in whole number, No unit) Contact time? min CT value? mg-min/L Disinfectant concentration? mg/L

A local plant has a pancake type disinfection tank. Diameter is 15 m and height is 6 m. Flow of filtered water is 43 m3/min. To meet EPA regulation, plant should achieve 3 log inactivation of Giardia Cyst at pH 8 and 20 degree Celsius. Currently plant uses chlorine as primary disinfectant. (*Answers in whole number, No unit) Contact time? min CT value? mg-min/L Disinfectant concentration? mg/L

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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An effluent at flow rate of 2760 m3/day is to be treated. The dosage of chlorine is 15 mg/lt and the disinfction model is Nt=Noe-0.145t. Determine the volume of disinfection unit required to kill 98% microbes.
The elimination of Cryptosporidium parvum oocysts from treated secondary effluent was investigated using a tertiary filtration method. Oocyst counts in the filter influent and effluent were 100,000 and 300 per 100L, respectively. Calculate the removal efficiency using (2) the log reduction method and (1) the percentage method.
True/False questions. 1 For filtration process: when the water level rises to the point that the filter bed must be cleaned. This point is called terminal head loss ( 2 As the temperature decreases the detention time in 7 slow-mix tank decreases. ( 6 8 When CO₂ is bubbled in water with carbonate buffer system, the pH will decrease slightly and the reaction will shift to the left. ( ) 9 The lower the water turbidity, the higher the allowable ) scour velocity in sedimentation tank.( For mixed-media filter the layer of garnet is used to catch the very fine particles ( 3 The addition of polymers in coagulation process is called inter-particle bridging. ( ) ) 4 Slow-mixing can be accomplished by hydraulic As the weir lengths become shorter the scouring velocity becomes higher ( jump ( ) ) 5 Water with high turbidity requires more coagulant 10 Aluminum sulfate has a wider pH range for effective to be treated. ( coagulation than fèrric salts ( )
QUESTION 2 Supposing you were part of the students who visited Barekease water treatment plant for a practical session during the semester in Kumasi. During the session, you had face to face interaction with the Water Engineer in charge of the chemical treatment unit a.) Discuss four (4) key factors that affect the selection of a disinfectant ) Examine five factors that influence disinfection efficacy and microbial inactivation ) A dual media filter is composed of 0.30 m anthracite (mean particle size 0.20 mm) that is placed over a 0.60 m layer of sand (mean particle size 0.70 mm) with a filtration rate of 9.78 m/h. Assume the grains sphericity ф= 0.75and porosity (ε)=0.40. Determine the head loss in the clean filter?
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Environmental engineering
Which of the following is not a piece of EPA legislation designed to protect the environment? Clean Water Act Clean Air Act O Civil Rights Act ORCRA D Question 2 What water contaminant was responsible for the 2014 Flint, Michigan water crisis? O Mercury Lead O PCB Giardia Question 3 What condition must be satisfied for us to use the Continuously Stirred Tank Reactor (CSTR) approach? Uniform well-mixed conditions Mixing occurs only in the axial direction The substance is conservative There is only one inflow channel D Question 4 A plug flow reactor is O Less efficient at removing pollutants than a CSTR Has the same efficiency at removing pollutants as the CSTR More efficient at removing pollutants than a CSTR Can be more or less efficient than the CSTR depending on the pollutant
A jar test reveals that the optimum alum coagulant dose is 50 mg/L at a pH of 8.1 and a temperature of 73 F. How many pounds per day of 49% alum are required for the whole plant? Total flow is 36 MGD with four parallel treatment plants, each designed for 12 MGD. Could use some guidance on setting up the equations.
CHAPTER 5 Q7. Determine the lime storage volume required for the following conditions: Average water demand = 0.18 m3/s Maximum dosage = 200 mg/L as CaO Shipping time = 1 week Lime is an interruptible chemical Assume the bulk density and purity of lime is the average of the values given in Table 7..
An organic matter is degrading in a steady state complete mix type reactor following the firstorder kinetics. The upstream concentration of organic matter is 20 mg/1 and downstream concentration is 4 mg/1. The treatment of water is at the rate of 58 m3/min. and volume of the tank is 580 m³. Which of the following statements is/are correct for the given reactor? Detention time of tank is 10 minutes. B Rate constant is 0.4 min¹ C Average rate of decay is 1.6 mg/1/s. D Correct Option Correct Option Detention time required to achieve 90% efficiency is 20 min.
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