Ww Class C

Front 1

Why are aerobic digesters covered?

Back 1

To keep the heat in

Front 2

What is plant staff based off of?

Back 2

Permitted flow & treatment type

Front 3

Why is the secondary anaerobic kept quiescence (inactive)

Back 3

Liquid and solid seperation

Front 4

Plant is in operation for 2 years. There is a sudden rise in fecal coliform. What is the cause?

Back 4

Solids build up in the CCC

Front 5

The digester supernatant is clear but has a rancid butter smell. What is the cause and what do you do?

Back 5

The pH dropped. Add lime to replenish alkalinity.

Front 6

The floating cover on an anaerobic digester is tilted on its side. What do you do?

Back 6

Hose the scum through the inspection ports

Front 7

How is fecal coliform reported?

Back 7

MPN and MF Method

Front 8

What book is approved for methods of lab testing

Back 8

Standard Methods for Water and WW

Front 9

How do you adjust packing glands?

Back 9

Occasional drip

Front 10

What information is stored for a PM maintenance program on the computer?

Back 10

All plant data can be accessed

Front 11

What is a soda acid fire extinguisher used for?

Back 11

Electrical fire

Front 12

How many changes do you make to a plant at a time?

Back 12

Make one change and wait a week

Front 13

How many years of records must be kept on site?

Back 13

3 years

Front 14

What are the best conditions for a WW treatment plant?

Back 14

2.0 DO / 7 pH / 75-95 degrees

Front 15

What is formed when ammonia and chlorine are added together?

Back 15

Chloramines

Front 16

What feature allows for digester cleaning?

Back 16

Sloped floor

Front 17

Steady increasing or decreasing values indicate what?

Back 17

A trend

Front 18

Waste materials such as sand/iron are what?

Back 18

Inorganic materials

Front 19

What happens if chlorine gas is removed too quickly?

Back 19

Freezing and reducing of feed rates

Front 20

When operating a plant that treats 1 MGD, how often must flow measurements be taken?

Back 20

Continuously

Front 21

According to DEP 62-601, at what intervals must a flow-proportioned sample be taken?

Back 21

Hourly

Front 22

Why should a soda-ash fire extinguisher never be used on an electric motor?

Back 22

Harmful gases will be produced

Front 23

Why is excess algae growth undesirable in a pond?

Back 23

It is aesthetically unpleasing

Front 24

At what temperature does a fusible plug in a chlorine cylinder melt?

Back 24

158 to 162 degrees F

Front 25

According to DEP rules, when are Discharge Monitoring Reports to be filed by?

Back 25

28th of the following month

Front 26

What are two ways to measure DO?

Back 26

Winkler & DO probe

Front 27

What problem can be expected when a high nitrogen content is present in the plant effluent that is being discharged to a stream?

Back 27

Abundance of algae growth

Front 28

Water is collecting at the inlet of a clarifier. What is the most probable cause?

Back 28

Weirs adjusted too high

Front 29

What is the proper procedure when shutting down an aerated grit chamber for an extended period of time?

Back 29

Divert flow, shut down blowers, lock out/tag out.

Front 30

Before placing a new chlorinator online, what is the first thing an operator should do?

Back 30

Read the O&M manual

Front 31

What type of valve is best for use in a sludge line?

Back 31

Plug valve

Front 32

What prevents water from flowing back into the inlet channel while cleaning screens?

Back 32

Outlet gate

Front 33

What is the most accurate way to measure sludge age?

Back 33

MCRT

Front 34

What process will occur when solids from the plant effluent fall to the bottom of a stabilization pond?

Back 34

Methane fermentation

Front 35

What do algae use to support metabolic functions?

Back 35

Nitrogen & phosphorus

Front 36

When analyzing data, a proportional increase or decrease in the values is called what?

Back 36

A trend

Front 37

If a pump will not start, what should an operator check first?

Back 37

Tripped circuit breaker

Front 38

The primary clarifier is operating properly, and the trickling filter has black slime and odor. What is the most probable cause of this abnormal condition?

Back 38

Plugged underdrain and/or recirculation lines.

Front 39

What can happen when a centrifugal pump is operated against a closed discharge valve?

Back 39

Water will heat up from cavitation and will damage pump

Front 40

Plant effluent samples reveal a high coliform count. The chlorinator is operating properly and there is good residual. What is the most probable cause.

Back 40

Short circuiting in CCC

Front 41

How often should a primary clarifier be shut down for cleaning?

Back 41

Yearly

Front 42

Where should MLSS samples be taken in an aerator?

Back 42

Near the effluent & 1ft below surface

Front 43

Why is WW disinfected?

Back 43

To reduce pathogenic bacteria to safe levels

Front 44

Nitrogen and phosphorus removal is achieved during

Back 44

Advanced secondary treatment

Front 45

Why should green sludge never be sent to a drying bed?

Back 45

Poor drainability and odors

Front 46

What is the lowest concentration at which chlorine can be detected by smell?

Back 46

.08 ppm

Front 47

After removing sludge to a drying bed, an operator should

Back 47

Flush the lines and leave the effluent line open

Front 48

How often should tanks be drained for cleaning?

Back 48

Periodically to avoid disruption of process

Front 49

What is the simplest device for controlling water level?

Back 49

A float

Front 50

Which process involved in anaerobic digestion is most affected by pH and temperature?

Back 50

Methane fermentation

Front 51

When pumping sludge to a digester, it is best to pump

Back 51

Small amounts at frequent intervals

Front 52

What is the main reason for removing grit from raw sewage during preliminary treatment?

Back 52

To protect pumps

Front 53

Domestic WW is composed primarily of what?

Back 53

Settleable solids

Front 54

What are the four types of pollution found in WW plant influent?

Back 54

Organic, inorganic, thermal, radioactive

Front 55

What is one disadvantage that anaerobic digesters have over aerobic digesters?

Back 55

Higher energy costs

Front 56

Anaerobic digester gas is leaking into the atmosphere. What is the most probable cause?

Back 56

Pilot flame went out

Front 57

What is detritus?

Back 57

A mixture of grit and organic material

Front 58

What provides buffering capacity in an anaerobic digester?

Back 58

Alkalinity

Front 59

What is one advantage that aerobic digesters have over anaerobic digesters?

Back 59

Less odors

Front 60

What should an operator not do prior to entering an anaerobic digester for cleaning purposes?

Back 60

Open all doors to remove gas, then use a lighter to make sure that all dangerous gases have been removed

Front 61

What process is used to remove chlorine from plant effluent prior to discharge into receiving waters?

Back 61

Dechlorination

Front 62

What is one reason for aerating wastewater?

Back 62

Seperate oil & grease

Front 63

On which part of a microscope is the slide placed?

Back 63

Stage

Front 64

What flow through rate should be maintained in a WW collection system?

Back 64

2 fps

Front 65

Clumps of sludge are floating on the surface of a digester. What is the most probable cause?

Back 65

Denitrification is occurring

Front 66

A dark, tan, shiny foam is present on the surface of an aeration basin, and pin floc is observed flowing over the weirs of the clarifier. What does this indicate?

Back 66

Old sludge

Front 67

What does a pH of 8.5 indicate?

Back 67

A basic solution

Front 68

How many temperature ranges can an anaerobic digester be operated in?

Back 68

3

Front 69

Which of the following is related to aerobic digestion?

Back 69

Endogenous respiration

Front 70

A healthy anaerobic digester will produce

Back 70

CO2 and methane

Front 71

What could cause a false green sheen to appear on a membrane filter?

Back 71

Fluorescent lights

Front 72

What is indicated by the presence of a homogenous billowing sludge on the surface of an aerator?

Back 72

Filamentous organisms/Low DO

Front 73

What is the minimum depth that should be maintained in a properly operated pond?

Back 73

3 feet

Front 74

Organic matter on the bottom of a stabilization pond will be acted on last by the

Back 74

Methane fermenters

Front 75

What is the first thing the operator of a rotating biological contactor should do before working on the unit?

Back 75

Lock out/tag out

Front 76

What type of sewer collects domestic wastes from homes?

Back 76

Sanitary

Front 77

There is an increase of coliform bacteria in the plant effluent

Back 77

Solids build up in the CCC

Front 78

Which of the following is not a part of a WW collection system?

Back 78

Distribution lines

Front 79

What is zoogleal film?

Back 79

Organisms that break down organic matter

Front 80

The automatic screen rake has stopped moving. What should be done first?

Back 80

Lock out/tag out

Front 81

An anaerobic digester is operating properly when the digester gas contains __% methane?

Back 81

70%

Front 82

What is head loss?

Back 82

The difference in height between two surfaces of water

Front 83

What is the best indicator of a possible problem in an anaerobic digester?

Back 83

Volatile acids/Alkalinity ratio

Front 84

What is the proper sludge concentration from an aerobic digester?

Back 84

4%

Front 85

What is the first stage of anaerobic digestion?

Back 85

Acid formation

Front 86

When using two lift station pumps, what is the best way to operate them?

Back 86

Alternate pumps every 24 hours

Front 87

Floating solids in the primary clarifier may indicate

Back 87

Denitrification & insufficient sludge removal

Front 88

A properly operating primary clarifier will remove what % of suspended solids?

Back 88

60%

Front 89

What DO level should be maintained in an aerobic digester?

Back 89

1-2mg/L

Front 90

What condition may occur when a sludge pump draws too much water?

Back 90

Coning

Front 91

A device that uses a spinning wheel to dry sludge is called a

Back 91

Centrifuge

Front 92

Which dangerous gases may be found at a WWTP?

Back 92

H2S/CL2/Methane

Front 93

What term describes the computer and all the components that are attached to it?

Back 93

Hardware

Front 94

What methods can be used to dispose of screenings?

Back 94

Incineration & burial

Front 95

A settleometer reveals that after 5 to 10 minutes solids won't concentrate above 700-900, and is settling slow. What does this indicate?

Back 95

Young sludge

Front 96

What device protects computers from power fluctuations?

Back 96

Surge protectors

Front 97

DEP regulations require that plant logs be

Back 97

Available for inspection 24 hours a day and protected

Front 98

What is a disadvantage of effluent disposal on land?

Back 98

Vector control and possibility of odors

Front 99

What is an example of preventative maintenance on gate valves?

Back 99

Exercising valve

Front 100

Chlorine cylinder is half full

No leaks detected

Cylinder valve is open one complete turn

Chlorine will not feed

What is the most probable cause of the abnormal condition described above?

Back 100

Inadequate injector vacuum

Front 101

Why should water never be put on a chlorine leak?

Back 101

It will cause pipes and fittings to corrode

Front 102

When ammonia is used to check for a chlorine leak, what color cloud will be produced if a leak is detected?

Back 102

White