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Advanced Water Treatment

by: Mrs. Jettie Towne

Advanced Water Treatment CEGR 6090

Mrs. Jettie Towne
GPA 3.55


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Class Notes
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This 2 page Class Notes was uploaded by Mrs. Jettie Towne on Sunday October 25, 2015. The Class Notes belongs to CEGR 6090 at University of North Carolina - Charlotte taught by Staff in Fall. Since its upload, it has received 11 views. For similar materials see /class/228935/cegr-6090-university-of-north-carolina-charlotte in Civil Engineering at University of North Carolina - Charlotte.


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Date Created: 10/25/15
Aquatic Chemistry CEGR 6090 Test No 1 Fall 1999 Bowen October 26 1999 Test Format and Instructions 3 problems on 2 pages 100 points total open book and notes takehome format initial all pages staple solutions to test and hand in package start at 7 PM 102699 deliver to me either in person or via fax 7045106499 by 102899 7 PM absolutely no discussion between class members on questions or answers Advice for All Problems 1 Speci cations such as CT or ST or P04T 10393 M refer to the cumulative concentrations of all the species ofa particular acid eg ST HZS H8 82 2 Alkalinity is speci ed in units of eql where an equivalent is a mole of charges For species with a charge of 1 or 1 eg H1 HS39 HCO339 H2P0439 the molar concentration eql 3 For problems concerning equilibrium with the gas phase it can be assumed that no other gasses provide acids or bases to the system except for those speci ed 4 Open and closed systems refer to whether or not the system is in equilibrium with the atmosphere 5 For any problem that seems either over or under speci ed you should point this out and make an assumption that will allow you to nd a solution Justify your assumption if necessary 6 Make simplifying assumptions wherever possible but justify the assumptions at the appropriate time 7 Show your work to the extent necessary that will allow me to give you partial credit should you make an error somewhere in your solution 1 Find the pH 30 points CT 10395 M alkalinity 10393 eql closed system Recipe water 10392 M NaHS c d Rainwater in years 1990 and 2100 C02g 355 and 600 ppm respectively open system 1304T 104 M H2P0439 105 4 M f Pc02 10393 5 atm alkalinity 103925 eql open system cm FD jdb7320wpd Page 1 Aquatic Chemistry CEGR 6090 Test No 1 Fall 1999 Bowen October 26 1999 2 Tableaux and LogC pH diagrams 40 points Given the following recipe NaHS 10395 M NaHCO3 091x10393 M NaZCO3 009x10393 M NaHZPO4 10396 M a Write a tableau for this problem showing all the species components the recipe and the appropriate masslaw constants b Draw a logCpH diagram for this problem showing the concentrations of all the species as a function of pH c Find the pH and the approximate concentrations of all the species using any method you choose d Calculate the alkalinity for the solution at the pH you calculated above e How much would the pH change if the alkalinity was decreased by 50 3 Acid Rain in Lakes 30 points A 10 hectare 100 m x 100 m pond has an average depth of 4 In Each year it receives 10 meter of direct precipitation and 10000 m3 of combined surface and groundwater runoff having an alkalinity 2x104 eql and CT 2x10394 M Over the next 100 years the pH ofthe rainwater is expected to decrease as the H2804 concentration in the rainwater increases from 00 to 10394 M and the C02g concentration increases from 355 to 600 ppm Predict the pH in the lake over the next 100 years time 0 100 years Be sure to include your assumptions regarding the kinetics of the various processes Hint For mixing of two streams the mixed concentration Cm can be calculated as Cm Q1C1 Q2C2Q1Q2 where Q1 and Q2 are the ows of the two streams and C1 and C2 are the concentrations of the two streams jdb7320wpd Page 2


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