A pickle-packing plant produces and discharges a waste brine solution with a salinity of 13,000 mg/L NaCl, at a rate of 100 gal/min, discharged into a stream with a flow rate above the discharge of 1.2 million gal/day and a salinity of 20 mg/L. Below the discharge point is a prime sport fishing spot, and the fish are intolerant to salt concentrations above 200 mg/L. What must the level of salt in the effluent be to reduce the level in the stream to 200 mg/L? Raw primary sludge at a solids concentration of 4% is mixed with waste activated sludge at a solids concentration of 0.5%. The flows are 20 and 24 gal/min, respectively. What is the resulting solids concentration? This mixture is next thickened to a solids concentration of 8% solids. What are the quantities (in gallons per minute) of the thickened sludge and thickener overflow (water) produced? Assume perfect solids capture in the thickener. (3 points for the correct answer per questions) Two flasks contain 40% and 70% by volume formaldehyde, respectively. If 200 g out of the first flask and 150 g out of the second are mixed, what is the concentration (expressed as percent formaldehyde by volume) of the formaldehyde in the final mixture?

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Answered: A pickle-packing plant produces and…

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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A pickle-packing plant produces and discharges a waste brine solution with a salinity of 13,000 mg/L NaCl, at a rate of 100 gal/min, discharged into a stream with a flow rate above the discharge of 1.2 million gal/day and a salinity of 20 mg/L. Below the discharge point is a prime sport fishing spot, and the fish are intolerant to salt concentrations above 200 mg/L. What must the level of salt in the effluent be to reduce the level in the stream to 200 mg/L?
Raw primary sludge at a solids concentration of 4% is mixed with waste activated sludge at a solids concentration of 0.5%. The flows are 20 and 24 gal/min, respectively. What is the resulting solids concentration? This mixture is next thickened to a solids concentration of 8% solids. What are the quantities (in gallons per minute) of the thickened sludge and thickener overflow (water) produced? Assume perfect solids capture in the thickener. (3 points for the correct answer per questions)
Two flasks contain 40% and 70% by volume formaldehyde, respectively. If 200 g out of the first flask and 150 g out of the second are mixed, what is the concentration (expressed as percent formaldehyde by volume) of the formaldehyde in the final mixture?

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