CEE 153 07 Final Exam and Solutions

CEE 153 07 Final Exam and Solutions - UNIVERSITY OF...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Page 1 of 7 UNIVERSITY OF CALIFORNIA, LOS ANGELES Civil and Environmental Engineering Department CEE 153 Introduction to Environmental Engineering Science Fall Term 2007 T-Th 2-4 PM 4000A Math Science Prof. K. D. Stolzenbach 5732J Boelter Hall, 206-7624 stolzenb@ucla.edu Final Examination (3:00 – 6:00 pm, December 12, 2007) _____________________________________________________________________________ PLEASE NOTE THE FOLLOWING Students are allowed to bring the information sheets brought to the mid-term and one additional sheet (both sides, approximately 8.5 × 11 inches) of summary notes with them into the examination room. No other material such as texts, class notes, or homework is permitted. This exam has five problems with multiple parts. The credit for each part is indicated. Before you start, make sure all pages of your examination copy are legible. The last page of the exam contains information that may be useful in solving the problems. Credit will be given for problems worked correctly even if the correct numerical answer is not obtained. Be sure to indicate clearly how you are approaching the problem. Answers obtained in correct algebraic form with defined variables and parameters will be given full credit. There are no long or tricky answers. If you find yourself doing anything long or tricky, stop and reevaluate your approach. In general, getting the correct answer to one sub-part of a problem should not depend on solving the other parts of the same problem, although you may need to use information given in another sub-part. If you have to leave the room for any reason during the exam, please do so quietly without asking. If you have a question during the exam, raise your hand and, if you are in the center of a row, come to the side isle.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Page 2 of 7 1. Briefly answer any three of the following questions: 3% i) Name three categories of water pollutants. 3% ii) How can local water use exceed local supplies? 3% iii) Name one alternative solution to global warming other than reducing carbon emissions. 3% iv) Why is there no effluent standard for ozone? 3% v) What problems make incineration a difficult choice for waste disposal? 3% vi) Why are coagulants added in water treatment? 3% vii) Why is it difficult to regulate sources of hazardous waste? 3% viii) What does the “10” in PM10 mean? 3% ix) What is the main objective of secondary treatment? 3% x) Why is groundwater contamination a particularly difficult problem? Note: Credit will be given for only three of the above questions. If more than three are answered, the first three will be graded.
Background image of page 2
Page 3 of 7 2. A flow Q = 2000 m 3 /day has a dissolved concentration c in = 100 mg/L of a toxic constituent. Half of the flow (Q/2) passes through a well-mixed reaction tank where a reactant is added that reacts with the toxic constituent with reaction rate k r = 10/day. The concentration of the dissolved toxic constituent in the flow leaving the reaction tank is c out react = 50 mg/L. The other half of the flow (Q/2) passes through a well-mixed settling tank where a flocculent is added to create suspended solids in the flow entering the tank.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 12

CEE 153 07 Final Exam and Solutions - UNIVERSITY OF...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online