CIVE 450 Midterm, Spring 2014

hee FOR ANSWER FACULTY OF ENGINEERING & ARCH AMERICAN UNIVERSITY or BELRUT DEPARTMENT OF CIVIL AND ENVI Prof.G.m 3 Ayoub 5 March 25 ¥ muh CIVE 450/ENSC620 “+ 2013 NAME Spring 2012/i3 W.&W.W. TRED EATMEWT - poration QUESTION SHEETS WITH YOUR ANSWER BOOKS * SWERS NOT SUPPORTED BY CALCULA’ Nor CONSIDERED, WHERE APPLICABLE ptichen: an, ~All calculations ar. place e to be expressed to the nearest tw i (0 decimal places b. Municipal water supply covers the needs for: domestic use, ini irrigation use and losses and waste. c. The type and extent of treatment will depend on the type of impurities present in the water —____ and the type of treatment used. d. Impurities in water are found in different forms which are divided i i into either suspended or are classified aeered, organic or inorganic materials as well as harmful microorganisms and depending on their size into either physical, chemical or biological. e. Flow measurement in treatment is performed by the use of a Venturi meter for flow in channels and a Parshal flume for pipe flows based on the principal of pressure differential and where a throat is present in both cases. e settling that takes place in the f. Storage may be classified as a treatment process because of th nom are killed in a relatively short period of storage time. The storage tank and because al growth of algae that provides oxygen is considered a disadvantage. g. The fractional removal of particle with settling velocities less than that of a design particle is given as V/Vs. h. The efficiency of the settling of discrete and hindered particles is determined by the Particle le particles is size distribution method while the efficiency of the flocculent an determined by the settling column analysis. sa land fine Solids to form ace effect Of the addition of COagulants is the form Ht icles 4nd the Production Of free hydroxy! ions from the ware: 2. 15% State where the following €quations are useg and wha’ Me —I)gd) b. H=[h?4 Vv f | qd B= kult~e)?(q}2y & s=[Qn/AP?)?2 : L gpe vy he function 3- 10% Draw a section through a conventional water treatment sehr viel ae Of each of the units in the plant. Include possible supplementary units that may be to the plant 2960 ad So —~— and the specific Sravity of the sludge is 1.05. fa ine the surface area o 10% What procedure would you follow if you are to determine t 5. tailed i eter. (Show a de kening tank where compaction settling is the governing param thickening procedure) 7 lected fi 00,000m3/day. The se 0% You are asked to design a sand filter system to nh i anes its i : ; day. Determine the total area of the fi mber 0 i ay. Determine the e iltration rate is 180 m/ : Effective istics are as follows: i is selected at 60 m2. The sand characteristics a if the standard unit area ion is 10 minutes s duration is he uniformity coefficient is 2. The backwash proces ize is 0.5 mm and the un “cit er, filter to waste duration is 5 minutes. Datermine t de . oY - The actual filtration rate. i washed once The am ent per d he backw ‘ocess if each unit is to be was f water spent per day in the backwash process if eac - ount of water : day. Do you have an efficiently operating system? ~Se every day. - The capacity of the wash water tank?