441 Midterm 1

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A successful engineer needs to realize the importance of life-long learning and continuously update knowledge and job skills

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56 Terms

1

A successful engineer needs to realize the importance of life-long learning and continuously update knowledge and job skills

True

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2

To express contaminant concentrations in water, 1 ppm is equivalent to 1,000 mg/l

false

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3

Removing carbon dioxide (CO2) in water will increase the pH of the water

true

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4

Adding salts to a water sample will raise its boiling point

true

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5

Coliform is commonly used as an indicator microorganism with regards to water quality

true

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6

Our drinking water needs to be both potable and palatable

false

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7

Saturated dissolved oxygen (DOsat) concentration in water open to air is ~30 mg/L @ 20 degrees celsius

false

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8

The sulfate buffer system controls the pHs of our ambient rivers and lakes

false

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9

The concentration inside a plug flow rector (PFR) is the same as the reactor effluent

false

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10

Batch reactors are operated under unsteady state

true

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11

Na2CO3 is the chemical formula for soda ash

true

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12

Chloride ion (Cl-) is considered as part of the hardness in water

false

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13

Coagulants are added to the coagulation process to destabilize the colloidal particles

true

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14

Colloidal particles in our ambient water typically carry positive charges

false

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15

For a coagulation/flocculation process, the velocity gradient of coagulation is larger than that of flocculation

true

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16

For three reactors in parallel, the entire flow goes through all the three reactors

false

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17

In a lime-soda softening process, carbonate hardness is harder to remove than non-carbonate hardness

false

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18

In a lime-soda softening process, magnesium ions are harder to remove than calcium ions

true

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19

In zone/hindered settling, particles will accelerate downward until reached a terminal velocity

false

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20

The hydraulic loading rate can be used to determine the top surface area of a sedimentation tank

true

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21

According to Schultz-Hardy rule, Al+3 is a more effective coagulant than Na+

true

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22

For coagulation/flocculation, the velocity gradient of flocculation > that of coagulation

false

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23

For coagulation/flocculation, typical hydraulic detention time for coagulation is about 20 minutes

false

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24

In discrete particle settling, a particle will accelerate downward until reached its terminal velocity

true

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25

Saturated dissolved oxygen (DOsat) concentration in water open to air is ~150 mg/L @ 20 degrees celsius

false

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26

To express contaminant concentrations in water, 1ppm is equivalent to 1.0 g/L

false

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27

Na2CO3 is the chemical formula for hydrated lime

false

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28

Compared to CFSTRs, PFRs are a better type of reactors for chlorine contact tanks

true

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29

The hydraulic loading rate is often used to determine the water depth of the process tank

false

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30

____ tests are often used in bench-scale studies to determine optimal coagulant and dosage

jar

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31

According to Stokes Law, the terminal velocity of a 30μ particle would be ___ times faster than that of a 10μ particle

nine

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32

Alkalinity of water is its capacity to neutralize

acids

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33

BOD5 values represents the amount of biodegradable ___ in water samples

organics

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34

For water balance, precipitation = infiltration + evapotranspiration + storage + ____

runoff

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35

For water quality, conductivity is an on-line indicator of ___ solid concentrations

dissolved

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36

Give a commonly-used unit for power: ____

watts

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37

Hydraulic detention of a process tank = ____ / Influent flow rate

volume

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38

MCL = Maximum ____ Level

Contaminant

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39

pH + pOH = ___ at 20 degrees celsius

14

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40

SDWA = ____ Drinking Water Act (Note: it is a federal regulation for drinking water)

Safe

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41

The oxidation state of sulfur in sulfate (SO4-) equals to

+6

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42

TSS = FSS + ____

VSS

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43

Two sources of water for drinking water supply: surface water and ____

groundwater

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44

Weight density of water = 9.81 kN/m^3 = ____ lb/ft^3 at 4 degrees celcius

62.4

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45

A water treatment plant contains filtration, flocculation, coagulation, and sedimentation (put thesefour unit processes/operation in a right order)

coagulation, flocculation, sedimentation, filtration

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46

Groundwater and surface water are two main sources for potable water supply.

True

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47

More constant water composition - groundwater or surface water?

Ground water

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48

Higher dissolved oxygen concentration - groundwater or surface water?

Surface water

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49

Higher pathogen concentration - groundwater or surface water?

surface water

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50

TDS = VDS +

FDS

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51

For water quality, turbidity is an on-line indicator of ___ solid concentrations

suspended

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52

The oxidation state of carbon in carbonate ions (CO3= ) equals to ___

+4

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53

After lime and soda softening, the magnesium concentration in water should be kept below ___ mg/L to prevent formation of hard scale.

40

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54

According to Stokes Law, the terminal velocity of a 10-μ particle would be ___ times faster than that of a 2-μ particle of the same type

25

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55

VSS+FSS=

TSS

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56

TDS+TSS=

TS

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