2.You are asked to design a disinfection system with a capacity of 50,000 L/hr toachieve 3 log removal of C. parvum from a water source with a minimum annualtemperature of 10 °C. Assume that you will use free chlorine at pH=6 and that youare designing to achieve a chlorine residual of 0.3 mg/L. Specify the total volumerequired (in m³) for the chlorine contactor and its dimensions (LxWxH in m)

To determine the volume and dimensions of a chlorine contactor without assuming the length and…

Answered: 2. You are asked to design a…

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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1. A CM reactor receives influent containing 10 mg/L of tracer dye for 2 hours. The tracer addition is terminated but the flowrate of water is maintained. The volume of the reactor is 10 L and the flowrate is 2 L/hr. What is the concentration of tracer in the reactor 1 hr after the dye addition is terminated? The reactor had an initial concentration of tracer of 1 mg/L when the tracer addition commenced.
Estimate the mass of solids removed during each hourly period. Assume 100% removal of particles in the treatment plant.
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
A tank originally contains 380 liters of brineholding 450 g of dissolved salt. 8 liters/min ofbrine containing 3.75 g/L of salt enters the tankand the mixture assumed uniform leaves therate of 12 L/min. Determine the amount of saltafter 10 min.
A separator accepts waste oil at 70% oil and 30% water by weight. The top product stream is pure oil while the bottom underflow contains 10% oil. If a flow of 20 gal/min is fed to the tank, how much oil is recovered? Two methanol-water mixtures are contained in a separate flask. The first mixture contains 40% w methanol and the second contains 70% w. If 200 g of the first mixture is combined with 150 g of the second, what are the mass and composition of the product?
2. Families in a community in a developing country use large, 200.0 L drums to un-treated surface water. You are designing a device that is designed to dose the volume with a coagulant, stir to allow flocculation, then add chlorine tablets to disinfect the water. The water is 25 °C and initially contains 1.0E+09 particles per L. The initial particles can be assumed to be spherical, 15.0 micrometers in diameter, and with a density of 1.675 g/mL. a. If the drums have a diameter of 572 mm, how long will it take for the particles to completely settle without any coagulation or flocculation? (answer in seconds) You have determined that you can achieve complete destabilization of particles by achieving an ionic strength of 0.01 M or higher. If you use alum (Al2(SO4)3) as a coagulating agent, what mass of alum must be added per batch of 200 L? (answer in grams) How many joules of energy would be required to stir the drum at a mixing intensity of 150 s-' for 20 minutes? If the drum is stirred…
An effluent stream sample (500 mL) from a metal-working facility contains 0.52 g nickel sulphate. (i) What is the nickel concentration of this effluent stream (in mg/L)? (ii) Would you regard this concentration as suitable for discharge to the local sewage system? (iii) How much total nickel (in kg) leaves the facility per year in this stream if ~1 ML of effluent is produced?
Environmental Engineering question: A drinking water treatment facility is planning to reduce operation cost and residence time for one of the reactors in the treatment plant. What type of rectors will you recommend and why? a. Batch reactor b. Plug flow reactor c. Continuously stirred tank reactor
Please upload your full solution to the following problem. A series of experiments was conducted in a batch reactor to assess the disinfection by chlorine of the protozoan Giardia lamblia. In each experimental run, the concentration of free available chlorine was varied and the time required to kill 99 percent of the organisms was determined. The results showed that a Ct value of 100 mg-min/L was sufficient to achieve 2-log removal. Assume that the Chick- Watson model holds with n = 1. A. What value is the psuedo-first order disinfection rate coefficient k (min ¹) when the chlorine concentration is 1 mg/L? B. At a chlorine concentration of 1 mg/L and a contact time of 10 minutes, what fraction of the G. lamblia organisms would be killed? C. At a chlorine concentration of 10 mg/L and a contact time of 5 minutes, estimate the fraction of the G. lamblia organisms that would be killed. 4
Liquid alum is delivered to a water treatment plant which contains 642.3 milligrams of alum per milliliter of liquid solution. Jar tests indicate that the best alum dose is 8 mg/L. Determine the setting on the liquid alum chemical feeder in milliliters per minute when the flow is 2.2 MGD.
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..

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