Class 1 Wastewater

Front 1

What is the maximum hold time for a COD sample?

Back 1

28 days

Front 2

What is the maximum hold time for a fecal Coliform sample?

Back 2

6 hours

Front 3

What kind of valve is used for a lime slurry?

Back 3

Ball valve

Front 4

What kind of valve is used for a throttle?

Back 4

Butterfly valve

Front 5

Waste water analysis and sampling techniques are published in?

Back 5

CFR 40 title 136

Front 6

Best gauge to measure low flow?

Back 6

V notch weir

Front 7

Computer security that would help prevent terrorist threats?

Back 7

Firewall

Front 8

What should a wastewater treatment plant manager know or do pertaining to public complaints?

Back 8

Know the rules and regulations pertaining to his plant

Front 9

What is an advantage of using mechanical seals instead of packing?

Back 9

You don't have to replace mechanical seals as often as packing

Front 10

Given the following data concerning the condition of a pump control panel what is the most likely problem?

Main power to panel normal

Pump main power is on

Pump local power switch in hand

Motor not running

Motor power indicator light off

Back 10

Motor burned out

Front 11

Sodium thiosulfate preservative is added to fecal Coliform bottles when?

Back 11

Before sterilization

Front 12

356 extremely hazardous substances listed by EPA at or above it threshold planning quantity must notify the SERC and LEPC within how many days?

Back 12

60 days

Front 13

The following device is used to measure low flow of wastewater

Back 13

V notch weir

Front 14

A gravimetric belt feeder maintains a constant chemical ____________ on a revolving belt.

Back 14

Weight

Front 15

The main petroleum refinery waste compounds the can be treated by the activated sludge process

A- ammonia

B- phenols

C- sulfide

D- all the above

Back 15

D- all the above

Front 16

Office plates require little if any preventive maintenance but occasionally ___________ of the hydraulic sensing lines is a good practice.

Back 16

Flushing

Front 17

Flows are measured with Venturi meters by sending the _________ between the water pressure before the restriction in the office and the pressure within the restriction.

Back 17

Pressure

Front 18

Closing a motor control circuit supplies ______ to the motor.

Back 18

Amps

Front 19

In the COD test what chemical is used for halides?

Back 19

Potassium dichromate

Front 20

Dailey flows from a municipality tends to?

Back 20

Stay close to the same flow

Front 21

What is a duplicate sample?

Back 21

Two samples taken at the same time from one location

Front 22

What is a replicate analysis?

Back 22

Two or more analyses for the same constituent in an extract of a single sample

Front 23

An employee has in the past had good attendance record and work performance. But now for the last couple of weeks he has reported late to work several times and neglected several of his duties. You should now do what?

Back 23

Talk to the employee about it

Front 24

Under SARA regulations how many pounds of chlorine can you have onsite with out having to report it?

Back 24

100 pounds

Front 25

The secondary treatment regulations say how much BOD and TSS % is to be removed?

Back 25

85% in 30 day average

Front 26

The lowest detectable level of chlorine residual using DPD method is?

Back 26

.01

Front 27

If the wastewater underwent partial nitrification, chlorine demand would most likely?

Back 27

Increase dramatically

Front 28

Everyday from 5-7 pm you notice a slug load of water passing through the treatment system. To what could you attribute this slug to.

Back 28

Industry

Front 29

In a confined space entry, what is the air monitor important?

Back 29

To check oxygen deficiency, explosive 10% LEL, toxic concentrations

Front 30

After a rainstorm you have a hydrologic slug, to what do you attribute this to?

Back 30

Infiltration

Front 31

An operator ask you a question that you don't know the answer to, what should you do?

Back 31

Tell him you don't know but you will find the answer for him

Front 32

At the startup of a DAF unit, why would you start and run the unit a while before introducing wastewater?

Back 32

To energize the water with air

Front 33

To decrease your sludge blanket on a DAF unit what should you do?

Back 33

Increase the speed of the scrapers

Front 34

What is the best method of chlorine determination to be used on a wastewater that is colored and residual of .1 ppm or below?

Back 34

Amperometric titration

Front 35

If your grit chamber is to small what is the effect on the system?

Back 35

Excess amounts of inorganics

Front 36

What would the results from a settleability test be used for?

Back 36

Determine WAS rate

Front 37

An operator needs to put a flow meter on a lift station from an area that is primarily industrial park. What kind of flow meter would be best for this application?

Back 37

Magnetic

Front 38

In the start up of a recently rebuilt centrifugal pump you notice the amperage draw is too high, what is the probable cause for this?

Back 38

Packing is to tight on shaft

Front 39

What is the definition of suction head?

Back 39

The distance from the water to the centerline of the impeller

Front 40

In the maintenance check of your rotary lobe blower system you notice it's overheating and the pop off valve is open. What is the probable cause for this?

Back 40

The diffusers are clogged

Front 41

In your primary sludge tank, your flight collector system is broken, what effect will this have on your treatment system?

Back 41

MLSS increase

Front 42

What should the oxygen levels be before entering a confined space?

Back 42

19.5%-21.5%

Front 43

When you get a sample for fecal Coliform, what should you do?

Back 43

Carefully fill the container to within 1 inch of the top

Front 44

If a district or municipality has a high bond rating, what does this mean?

Back 44

You will get a high return on the money

Front 45

What preservative is used for q ammonia sample in addition to 4°c?

Back 45

H2SO4 to a pH of <2

Front 46

If a needle is jumping around o. The DO meter what does this indicate?

Back 46

Membrane is bad

Front 47

Why should you check ground water levels before pumping a clarifier for service?

Back 47

So the tank doesn't float

Front 48

If the cent rate looks dirty what should you do?

Back 48

Decrease flow

Front 49

At what temperature is conductivity reported?

Back 49

25°c

Front 50

If you have a DO of 6.5 mg/l it is.

Back 50

Saturated

Front 51

What pH do you adjust your sample to before ammonia distillation?

Back 51

9.5

Front 52

What is the better disinfectant?

A- hypochlorite acid

B- monochloramines

C- di chloramines

Back 52

A - hypochlorite acid

Front 53

Which statement best describes the safety concerns for carbon dioxide?

Back 53

It is heavier than air and will cause an oxygen deficient atmosphere by displacing oxygen

Front 54

Which of the following chemicals is explosive, corrosive and causes death?

A - methane

B- hydrogen sulfide

C- ferric chloride

Back 54

B - hydrogen sulfide

Front 55

What forms of nitrogen does the TKN test identify?

Back 55

Organic and ammonia

Front 56

When using a SCBA what position does the bypass valve stay in?

Back 56

Closed

Front 57

When repackaged f a gate valve, to minimize leaking open it....

Back 57

1/2 turn open

Front 58

What can be done to minimize water hammer?

Back 58

Install an air bleed valve

Front 59

In your sludge pumping program, the sludge blanket is rising and the % solids is 9% when you start pumping and 6% when you stop. What should you do to correct this problem?

Back 59

Decrease the pumping rate

Front 60

When using an SCBA you can interchange parts from different manufacturers when?

Back 60

Always

Front 61

What if the following can be collected as a composite sample?

A- pH

B- oil and grease

C- TSS

Back 61

C- tss

Front 62

At the lowest fees setting on you chlorinate you still have too much residual. What can you do to still use the same equipment?

Back 62

Change to a smaller rota meter device

Front 63

What does conductivity give an indication of?

Back 63

Trace metals

Front 64

What test is used to measure the strength of waste water?

Back 64

BOD

Front 65

Methane and what other gas is found in an anaerobic digester?

Back 65

Carbon dioxide

Front 66

How long do you keep sludge records?

Back 66

5 years

Front 67

If you have a leak in the chlorine tank where do you place the leak?

Back 67

At the top

Front 68

Most DO meters are what kind?

Back 68

Membrane

Front 69

Winkler titration is for?

Back 69

Dissolved Oxygen

Front 70

Given the following data what is the most likely cause of the activated sludge diffused aeration system problem

Blower air rate output high

Organic load normal

Hydronic load normal

Borderline dissolve oxygen

Low turbulence throughout aeration tank

Back 70

Aeration system pipe leaking

Front 71

Comparison of industry flow and flow of municipality/wastewater treatment plant?

Back 71

Industry wastewater vary widely in composition, strength, flow and volume as compared to municipality wastewater treatment

Front 72

If you hire a contractor to work on your chlorine system, OSHA requires you to do what?

Back 72

Inform them of any hazzards

Front 73

Chemical releases should be reported because of what provision?

Back 73

SARA III

Front 74

Successful communication requires mutual...

Back 74

Understanding

Front 75

For utility records and/or rate analysis purposes, customers with changing patterns of wastewater are...

Back 75

Municipal

Front 76

Which of the following meters has no moving parts?

A- rotometer

B- Venturi

C- proportional

D- propellor

Back 76

B- venturi

Front 77

Which pump impeller is the most energy efficient?

Back 77

Closed impeller

Front 78

You can calculate flow rate in a completely filled pipe if you measure flow velocity or ______.

Back 78

Internal pressure

Front 79

In order to discharge treated wastewater to a receiving water in the U.S. The operator of the facility must obtain a permit every _____ years.

Back 79

5

Front 80

You are working in a room using an aerosol can, what is the minimal I alarum protection?

Back 80

Protective mask

Front 81

What material would most likely be found in the waste from a tanning industry?

Back 81

Organic material

Front 82

BOD:nitrogen:phosphorous

Ratio is...

Back 82

100:5:1

Front 83

The presence of amoebas in a mixed liquor sample indicates that the sludge is probably....

Back 83

Young

Front 84

The presence of Rotifera in a mixed liquor sample indicates that the sludge is probably....

Back 84

Old

Front 85

What type of laboratory analysis is usually reported monthly as a geometric mean?

Back 85

Fecal coliform

Front 86

A chemical solution where the normality is established is known as a __________ solution.

Back 86

Stock

Front 87

What is the major safety hazard with polyelectrolytes?

Back 87

Slipping

Front 88

What is a major safety hazard with ferric chloride?

Back 88

Corrosive

Front 89

Which gases can you be exposed to in a treatment plant?

Back 89

Chlorine, methane and hydrogen sulfide

Front 90

When using a SCBA you have to be:

Back 90

Trained in use

Front 91

What is the best chemical to use to adjust pH in an anaerobic digester?

Back 91

Lime

Front 92

In the VSS test what is the temperature?

Back 92

550°c +/- 50°

Front 93

When chlorine is applied to wastewater the residual is composed mostly of....

Back 93

Hypochlorite ions

Front 94

If the centrate from a solid bowl centrifuge is foamy white, what should you do?

Back 94

Decrease polymer

Front 95

When you chlorinate your return sludge to control filamentous bacteria with chlorine or peroxide, these chemicals are...

Back 95

Oxidizers

Front 96

Ferric chloride is...

Back 96

Corrosive

Front 97

Ferric chloride is...

Back 97

Corrosive

Front 98

What is the result of discharging a water with a high BOD loading to a stream?

Back 98

Oxygen depletion in the stream

Front 99

When you mix acid in water what do you do?

Back 99

Mix acid into water

Front 100

What do you wear when making a confined space entry?

Back 100

Safety harness and hard hat

Front 101

What do you wear when making a confined space entry?

Back 101

Safety harness and hard hat

Front 102

In BOD why do you add chemicals to the dilution water?

Back 102

To adjust pH and provide nutrients to organisms

Front 103

The bacteria that is the true filamentous stalked gram positive is...

Back 103

Nocardia

Front 104

In the examination of MLSS you notice the flagellates more dominate, the respiration rate decreased dramatically and over all treatment declining, what is the probable cause for this?

Back 104

Toxic slug load from industry

Front 105

How long is the NPDES permit good for?

Back 105

5 years

Front 106

How long is the NPDES permit good for?

Back 106

5 years

Front 107

How long before the NPDES permit expires should you start the renewal process?

Back 107

You have to file 180 days before expiration

Front 108

How long is the NPDES permit good for?

Back 108

5 years

Front 109

How long before the NPDES permit expires should you start the renewal process?

Back 109

You have to file 180 days before expiration

Front 110

If you have a dairy discharging in your waste steam what effect can this have on the plant?

Back 110

Increase BOD loading

Front 111

Why would you put alum into a secondary clarifier?

Back 111

Flock and remove phosphorus

Front 112

What is vulnerability assessment?

Back 112

The process of identifying, quantifying and prioritizing vulnerabilities in the system

Front 113

At what pH is hydrogen sulfide most corrosive?

Back 113

Less than 5 pH

Front 114

How is current measured?

Back 114

Amps

Front 115

What tool is used to measure air and gas?

Back 115

CO2 meter

Front 116

What tool is used to measure air and gas?

Back 116

CO2 meter

Front 117

What is an Orpheus plate?

Back 117

A device used for measuring flow rate by reducing pressure or restricting flow

Front 118

What tool is used to measure air and gas?

Back 118

CO2 meter

Front 119

What is an Orpheus plate?

Back 119

A device used for measuring flow rate by reducing pressure or restricting flow

Front 120

What is static head?

Back 120

Internal pressure of a fluid due to the pressure exerted on its container

Calculate pressure from hieght

Front 121

What should be done first when a problem developed in a mechanically cleaned screen?

Back 121

Lock out tag out

Front 122

What are the problems that can develop from using a lime slurry?

Back 122

Buildup inside pumps and pipes

Front 123

How can you tell if a new pump is delivering design flows and pressures?

Back 123

Measure flows and pressures and compare with manufacturers pump curve

Front 124

Which of the following can most affect the pH of an anaerobic digester?

Back 124

Temperature

Front 125

Which of the following can most affect the pH of an anaerobic digester?

Back 125

Temperature

Front 126

The ph of a well operated anaerobic digester should be about?

Back 126

6.9

6.8-7.2

Front 127

Which of the following can most affect the pH of an anaerobic digester?

Back 127

Temperature

Front 128

The ph of a well operated anaerobic digester should be about?

Back 128

6.9

6.8-7.2

Front 129

How is the amount of oxygen transferred per aerator horsepower affected by water temp in the aeration tank?

Back 129

Oxygen transfer rate increases as temp increases

Front 130

A gravimetric belt feeder uses what to measure?

Back 130

Weight

Front 131

What is the best backflow prevention?

Back 131

Air gap

Front 132

What preservative do you use to preserve a nitrogen sample?

Back 132

Sulfuric acid - H2SO4

Front 133

What is a duplicate sample?

Back 133

Two samples taken at the same time from one location

Front 134

You are running a BOD, on the first day the sample starts nitrification because:

Back 134

Bacteria population is high

Front 135

You are running a BOD, on the first day the sample starts nitrification because:

Back 135

Bacteria population is high

Front 136

Wastewater flow with large objects, the pump should have a:

Back 136

Closed impellar

Front 137

What do you do to adjust a sample before ammonia distillation?

Back 137

Raise the pH

Front 138

What does population equivalent mean?

Back 138

A means of expressing the strength of organic material in wastewater

Front 139

When purchased materials are received by the utility they should be.

Back 139

Counted and checked against the purchase order

Front 140

When purchased materials are received by the utility they should be.

Back 140

Counted and checked against the purchase order

Front 141

Uniformly coefficient refers to:

Back 141

Measure of the uniformity of filter media

Front 142

Alum is used to remove...

Back 142

Phosphorus

Front 143

pH on odor control should be at?

Back 143

9.5

Front 144

Holding time for nitrogen?

Back 144

28 days for TKN and 48 hrs for nitrite

Front 145

Holding time for nitrogen?

Back 145

28 days for TKN and 48 hrs for nitrite

Front 146

What type of materials should be avoided in piping for ferric chloride?

Back 146

Metals

Front 147

What method is best used to determine DO

Back 147

Winkler titration

Front 148

What method is best used to determine DO

Back 148

Winkler titration

Front 149

Federally approved methods for wastewater analysis are listed in ...

Back 149

40 CFR 136

Front 150

What method is best used to determine DO

Back 150

Winkler titration

Front 151

Federally approved methods for wastewater analysis are listed in ...

Back 151

40 CFR 136

Front 152

As the temp increases the oxygen transfer rate ?

Back 152

Increases

Front 153

What gas is most commonly found on the startup off a digester that also drops the pH.

Back 153

Carbon dioxide

Front 154

Nestlerization is used for what?

Back 154

Ammonia test

Front 155

For security reasons SCADA should not be connected to what?

Back 155

Internet

Front 156

Precision is the measure of consent ration, concentration is normalized by using?

Back 156

Coefficient/ standard accuracy

Front 157

Precision is the measure of consent ration, concentration is normalized by using?

Back 157

Coefficient/ standard accuracy

Front 158

Air gas flow meter

Back 158

Orfice

Front 159

Precision is the measure of consent ration, concentration is normalized by using?

Back 159

Coefficient/ standard accuracy

Front 160

Air gas flow meter

Back 160

Orfice

Front 161

Advantage of using ferrous over alum

Back 161

Broader pH range

Front 162

Which of the following is the most significant problem in using the activated sludge process to treat seasonal cannery waste?

Back 162

Nutrient imbalance

Front 163

Which of the following is the most significant problem in using the activated sludge process to treat seasonal cannery waste?

Back 163

Nutrient imbalance

Front 164

pH for an anaerobic sludge digester?

Back 164

6.8-7.4

Front 165

Which of the following is the most significant problem in using the activated sludge process to treat seasonal cannery waste?

Back 165

Nutrient imbalance

Front 166

pH for an anaerobic sludge digester?

Back 166

6.8-7.4

Front 167

Amperometric titration is often used when measuring?

Back 167

Residual chlorine

Front 168

Type of pump used to decrease the overall specific weight of a confined column of a gas-water mixture?

Back 168

Air lift

Front 169

If the discharge head drops on a pump what will happen to the pump?

Back 169

Lower discharge flow

Front 170

If the discharge head drops on a pump what will happen to the pump?

Back 170

Lower discharge flow

Front 171

The beveled edge of a weir is located?

Back 171

Top face of the weir

Front 172

If the discharge head drops on a pump what will happen to the pump?

Back 172

Lower discharge flow

Front 173

The beveled edge of a weir is located?

Back 173

Top face of the weir

Front 174

What two gases are most promo are at the startup of a digester?

Back 174

Carbon and nitrogen

Front 175

If the discharge head drops on a pump what will happen to the pump?

Back 175

Lower discharge flow

Front 176

The beveled edge of a weir is located?

Back 176

Top face of the weir

Front 177

What two gases are most promo are at the startup of a digester?

Back 177

Carbon and nitrogen

Front 178

What does it mean if a fitting is 210 lbs?

Back 178

Pressure

Front 179

For every _____ c the temp changes biological activity will change

Back 179

10°

Front 180

MHF interior column cooling temp raises why?

Back 180

Sludge feed dropped

Front 181

Capacitance level indicator daily maintenance?

Back 181

Clean connectors

Front 182

Which of the following is the most likely cause of fluctuating discharge output in a progressive cavity pump?

Back 182

Leak in suction pipe

Front 183

How does UV control disinfection

Back 183

Sterilizing the micro organisms so they can not reproduce

Front 184

What is a maintenance procedure for UV

Back 184

Check and clean Quartz sleeves

Front 185

Two pumps of the same capacity operate together with a single main in a typical pump station the discharge will be?

Back 185

The same as one pump

Front 186

What type of bottle is used for COD samples?

Back 186

Glass

Front 187

Which of the following microscope optical systems should be used when testing for filamentous organisms?

Back 187

Phase contrast

Front 188

Theoretically 1mg/l of sulfur dioxide will react instantaneously to neutralize how many mg/l of chlorine in the final effluent?

Back 188

1 mg/l

Front 189

A recently rebuilt centrifugal pump has just been returned to service and is now drawing more amps. What is the most likely problem?

Back 189

Leaky suction line

Front 190

The pH of an aeration tank influential is 7.4. The effluent from the aeration tank has a pH of 6.5. The MCRT is 14.5 days. The most likely cause for this is?

Back 190

Insufficient alkalinity to support nitrification process

Front 191

The pH of an aeration tank influential is 7.4. The effluent from the aeration tank has a pH of 6.5. The MCRT is 14.5 days. The most likely cause for this is?

Back 191

Insufficient alkalinity to support nitrification process

Front 192

Assuming the operator makes no adjustments in the aeration return or waste rate, the addition of high strength anaerobic digester supernatant to the head of the aeration tank will?

Back 192

Decrease the DO concentration in the tank

Front 193

A plant has a flow of 1.5 MGD that contains an industrial waste. The influential has 600 mg/l BOD. Assuming .17 pounds of BOD per capita per day, what is the population equivalent of this waste?

Back 193

44153

Front 194

A 20000 gallon tank is full of a liquid with a specific gravity of 1.35. What is the weight of the contents of the tank?

Back 194

225,180 pounds

Front 195

In conducting an oxygen uptake test the feed sample consist of:

Back 195

Return activated sludge

Front 196

In conducting an oxygen uptake test the feed sample consist of:

Back 196

Return activated sludge

Front 197

A pump has a capacity of 7000 gal/min and lifts the flow 22 feet total head. If the pump efficiency is 85% what the motor is required.

Back 197

50 hp

Front 198

A treatment plant is producing 3750lbs/day of 5% total solids sludge. The positive displacement pump operates at 2.5 gal/stroke and 40 strokes/min. How long will it take for the sludge to be pumped?

Back 198

30 minutes

Front 199

A treatment plant is producing 3750lbs/day of 5% total solids sludge. The positive displacement pump operates at 2.5 gal/stroke and 40 strokes/min. How long will it take for the sludge to be pumped?

Back 199

30 minutes

Front 200

Blower engines must be started in an unload mode because..

Back 200

Venting to the atmosphere reduces back pressure and allows the engine to be brought to operating speed under no load conditions.

Front 201

An operator wasted 13500 gallons of activated sludge to maintain the desired MCRT. The waste activated sludge meter was observed to rise 2 feet in 5 minutes and 30 seconds. What was the rate (GPM) of the flow into the wet well.

Back 201

524 GPM