Wastewater Extra Questions Grade 1

Front 1

How to calculate lbs of Alk required:

Back 1

Lbs of ammonia removed x 7.2 lbs of Alk

Hint 1

Ammonia?

Front 2

How to calculate lbs of Alk available:

Back 2

Flow x Alk (mg/l) available x 8.34

Hint 2

Davidson Pie

Front 3

How to calculate lbs of Alk needed:

Back 3

Lbs of Alk required minus Lbs of Alk available

Hint 3

Subtraction

Front 4

How will algae impact chlorine demand in the pond effluent?

Back 4

Increase chlorine demand

Front 5

Volume of the secondary clarifier is not needed to determine the:

Back 5

F/M ratio

Front 6

What 2 tests are indirect measurements of the organic content in the influent?

Back 6

COD and BOD

Front 7

Extended Aeration does does not produce as much ____ ____ as other processes.

Back 7

Waste Sludge

Front 8

Vertical distance from normal water surface to the top of the levee in a waste stabilization pond is:

Back 8

Freeboard

Front 9

Recirculating activated sludge is common practice in an:

Back 9

Activated Sludge Process

Front 10

A standby person should be located outside the entrance to the confined space, while another person should be within sight or call of the standby person prior to:

Back 10

entering a permit required confined space

Front 11

How often should an anaerobic digester be fed?

Back 11

Several times a day

Front 12

________ enters the headworks of the plant.

Back 12

Influent

Front 13

What type of organism can use nitrate as a source of oxygen?

Back 13

Facultative bacteria

Front 14

An Oxidation ditch is usually operated in Extended Aeration mode, and is used for _____ flows.

Back 14

small

Front 15

What should be done if a large amount of organic material is found in the grit channel?

Back 15

Increase the velocity of the wastewater

Front 16

Which flowrate should you use to calculate the hydraulic loading to a trickling filter? ( use words ) ______ + ______

Back 16

Plant inflow plus recirculated flow

Front 17

What process includes a blower?

Back 17

Activated Sludge

Front 18

What kind of treatment does an activated sludge system use to remove waste from wastewater?

Back 18

Biological

Front 19

Addition of chlorine to wastewater at the entrance to the plant, and used for odor control, BOD removal, and aids in sedimentation best describes:

Back 19

pre-chlorination

Front 20

Acid fermenters will predominate and lower the pH in a digester if too much __ ______ is added.

Back 20

raw sludge

Front 21

Gasification from "aging" sludge will cause ____ to rise in a clarifier.

Back 21

sludge

Front 22

What should you wear when entering a room with a harmful concentration of chlorine gas in the air?

Back 22

SCBA ( self contained breathing apparatus )

Front 23

Hydrogen Sulfide is NOT lighter than______.

Back 23

air

Front 24

To prevent gasification of sludge (rising sludge) in a clarifier, it should be removed in a ______ _______.

Back 24

timely manner

Front 25

Reducing the volume of sludge and stabilizing the solids is the purpose of ______ ______.

Back 25

Sludge Digestion

Front 26

Foaming in a digester can be caused by __________ overload.

Back 26

Organic

Front 27

If the flow line of launder is low, will this cause short circuiting?

Back 27

No

Front 28

A grab sample is most suited for:

Back 28

residual chlorine

Front 29

Depth of launder will or will not affect settling characteristics on a clarifier?

Back 29

Will Not

Front 30

To evaluate a TSS, you should use a ________ sample.

Back 30

composite

Front 31

Decomposing organic matter under anaerobic condition creates:

Back 31

Hydrogen Sulfide

Front 32

A pond with a DT of less than 3 days will perform similar to a:

Back 32

Sedimentation Tank

Front 33

An average time a microorganism spends in an activated sludge process is known as:

Back 33

MCRT

Front 34

What 2 things are used to control feed rate for disinfection?

Back 34

Flow and chlorine residual

Front 35

Contingency planning to determine the vulnerability of the utility during various types of emergencies and identify actions to reduce the risk is a __________assessment.

Back 35

vulnerability

Front 36

Modify operations to increase solids under aeration to provide more microorganisms to treat the BOD in ________ _________ months.

Back 36

colder, winter

Front 37

If sludge is isolated by closing the valves on each end for several days, gas production will ______ the internal pressure and cause the line to ______.

Back 37

increase, fail

Front 38

Filamentous organisms could thrive and prevent sludge floc from settling in the secondary clarifier if the _____ _____ in the aeration tank is too low.

Back 38

dissolved oxygen

Front 39

When mixed liquor solids settles slowly and compacts to a limited extent, it is known as:

Back 39

Sludge Bulking

Front 40

Black slime growth on an RBC can indicate solids or organic _________.

Back 40

overloading

Front 41

Chain driven scrapers called "flights" are a common type of ____ collector.

Back 41

grit

Front 42

Surface loading and detention time are indirectly related to ______.

Back 42

flow

Front 43

Never let the _____ formation get larger than the _______ formation in an anaerobic digester.

Back 43

acid, methane

Front 44

The extended aeration process has a low _____ratio.

Back 44

F/M

Front 45

_____ disinfection is gaining in popularity as an alternative to chlorine.

Back 45

UV

Front 46

If F/M ratio increases, more ____ is needed.

Back 46

dissolved oxygen

Front 47

A major cause of repeated sludge bulking is high _____ to ____ loading rates.

Back 47

food to microorganism

Front 48

Improper sludge removal from the clarifier causes primary effluent to become _____ and odorous.

Back 48

black

Front 49

What does the healthy activated sludge smell like?

Back 49

Earthy

Front 50

The addition of chlorine to wastewater until the chlorine demand is met is called:

Back 50

Breakpoint Chlorination

Front 51

A sludge digester can be either ______ or anaerobic.

Back 51

aerobic

Front 52

The velocity of a grit channel should be _______ than the collection system.

Back 52

lower

Front 53

An _____ test is considered positive when there are gas bubbles in the tube.

Back 53

MPN

Front 54

Coliform bacteria are considered harmless, but their presence nay indicate the presence of ________.

Back 54

pathogens

Front 55

You should _______ sludge in a Primary Clarifier more frequently if you see sludge rise.

Back 55

remove

Front 56

Microorganisms grow rapidly as temperature _______.

Back 56

increases

Front 57

Under aeration during the winter, what should you increase?

Back 57

solids

Front 58

If the influent solids loading rate to an activated sludge system increases, ________ wasting rate of the sludge.

Back 58

reduce

Front 59

If the influent BOD increases, more ________ will be required in the aeration tank.

Back 59

oxygen

Front 60

What kind of sludge may cause pin floc in the secondary clarifier to overflow?

Back 60

Over Oxidized

Front 61

_________bacteria can use dissolved oxygen or oxygen obtained from materials such as sulfate or ions.

Back 61

Facultative

Front 62

Oxygen is deficient when the concentration is less than ______ by volume.

Back 62

19.5

Front 63

Hydrogen Sulfide will deteriorate ________ structures.

Back 63

concrete

Front 64

The ________ the PH, the better the disinfection.

Back 64

lower

Front 65

When the velocity of wastewater in a clarifier is greater in some sections than others, it will lead to:

Back 65

short circuiting

Front 66

Anaerobic decomposition of sewage will release what gas?

Back 66

Hydrogen Sulfide

Front 67

Operate an activated sludge system at a low MCRT if you have limited ________.

Back 67

aeration

Front 68

Typical suspended solids concentration of domestic influent wastewater is ____ to ____ mg/l.

Back 68

150 to 400

Front 69

Free chlorine combines with water to form the 2 acids:

Back 69

Hypochlorous, Hydrochloric

Front 70

One way to resolve an increase in the volatile acid/alkalinity ratio in an anaerobic digester is to ________ raw sludge feed rates.

Back 70

decrease

Front 71

A slight seal leakage should be observed when a pump is operating to keep the _________ cool.

Back 71

packings

Front 72

Chlorine gas is or is not flammable.

Back 72

Is Not

Front 73

What chemical controls hydrogen sulfide gas?

Back 73

Chlorine

Front 74

What collects the primary effluent that flows over the weir and conveys it towards the next treatment process?

Back 74

launder

Front 75

What requires oxygen, by breaking down chemical compounds that contain oxygen, such as sulfate, for metabolism?

Back 75

anaerobic bacteria

Front 76

If the intake of a progressive cavity pump is not kept ____ it could damage the pump.

Back 76

wet

Front 77

What does a reliable and calibrated gas monitor/detector detect?

Back 77

oxygen deficiency