Wastewater Ponds

Front 1

true or false all water pond systems have a head works to remove grit and rags before the waste water enters the pond?

Back 1

False not all pawn systems have screening and grit removal.

Front 2

True or false membrane covers on anaerobic ponds capture methane gas for reuse?

Back 2

True

Front 3

True or false wastewater pond systems can reliably remove nutrients from their effluent?

Back 3

False ponds do not remove nutrients consistently.

Front 4

This type of pond treatment system is best suited to high strength industrial waste.

Back 4

Anaerobic

Front 5

The most commonly used type of wastewater pond system is?

Back 5

Facultative

Front 6

This type of wastewater pond is shallow enough for sunlight to penetrate the entire pond.

Back 6

Aerobic

Front 7

How often does an evaporated pond typically discharge effluent to receiving stream, river or lake?

Back 7

Never

Front 8

Most of the dissolved oxygen in unariated aerobic and faculative ponds come from?

Back 8

Photosynthesis

Front 9

These organisms are primarily responsible for BOD removal in wastewater ponds.

Back 9

Bacteria

Front 10

The first pond in a wastewater pond system is similar to what unit process in a mechanical treatment facility?

Back 10

Primary clarification

Front 11

The minimum number of ponds required by most regulatory agencies to prevent short circuiting is?

Back 11

Three

Front 12

The main gas produced at any type of wastewater pond system by bacteria is?

Back 12

Carbon dioxide

Front 13

a wastewater pond system consists of five ponds operated in parallel raw in fluid water is fed to the first two ponds how many primary ponds are there?

Back 13

Two

Front 14

About half of the organic material that settles to the bottom of the pond will ultimately be converted into?

Back 14

Methane and carbon dioxide

Front 15

Algae

Back 15

Produces oxygen

Front 16

Bacteria

Back 16

Consumes BOD and releases nutrients

Front 17

AOB and NOB

Back 17

Convert ammonia to nitrite and nitrate

Front 18

Acid formers

Back 18

Converts settleable BOD and biomass into VFAs

Front 19

Sulfate reducing bacteria

Back 19

Consume BOD and release hydrogen sulfide

Front 20

Methanogens

Back 20

Converts VFAs into methane

Front 21

The pH in an unariated faculative pond will be lowest when?

Back 21

Early morning

Front 22

Algae obtain carbon from growth and reproduction from?

Back 22

Dissolved carbon dioxide

Front 23

During photosynthesis algae produce?

Back 23

Oxygen

Front 24

Dissolved oxygen concentrations will be highest in an unariated facultative pond?

Back 24

On a bright sunny day

Front 25

This type of algae is rarely seen in wastewater treatment ponds.

Back 25

Red

Front 26

A healthy pond with high dissolved oxygen should appear?

Back 26

Green and sparkling

Front 27

Ponds tend to turn from green to brown as the day gets shorter and less sunlight is available because?

Back 27

Diatoms come capture light over more of the light spectrum.

Front 28

A sudden increase in the amount of algae in a pond is called a?

Back 28

Bloom

Front 29

The unique ability of cyanobacteria also called the blue green algae allows them to prosper when green algae cannot?

Back 29

Use nitrogen gas from the atmosphere

Front 30

Cyanobacteria blooms are most likely to occur in the?

Back 30

Autumn

Front 31

Cyanobacteria are problematic in natural and wastewater pond systems because?

Back 31

Some species produce toxins

Front 32

a small community host an annual festival that doubles or triples the town's population during the festival the surface of the wastewater ponds turns from sparkling green to dark pink What is the most likely cause?

Back 32

Increased BOD load

Front 33

Red clouds of tiny darting organisms are observed at the edge of a pond in the early morning. which of the following must be true?

Back 33

Dissolved oxygen concentrations are low

Front 34

A bloom of daphnia or rotifers is most likely to occur?

Back 34

Immediately after a bloom of green algae

Front 35

A faculative pond turns dark purple which of the following statements must be true?

Back 35

Anaerobic conditions have caused a bloom of purple surface bacteria

Front 36

BOD loading to facultative ponds is limited by?

Back 36

Available oxygen

Front 37

a mechanically aerated facultative pond system has three sales operated in series dissolved oxygen concentration in the primary pond have been dropping steadily and are now below 1 mg/L even in the late afternoon The operator should?

Back 37

Consider switching to parallel operation

Front 38

Facultative ponds are capable of processing more BOD load when?

Back 38

Wastewater is warmer

Front 39

Given the following information what is most likely cause of high TTS in the final effluent? pond is located in Minnesota it is early spring air temperatures have increased from 41 degrees to 59 degrees over the last 5 weeks The pond is free of ice but has not yet achieved its summer green sparkle affluent BOD is less than 5 mg/L effluent TTS is 120 mg/L.

Back 39

Pond turnover

Front 40

When is green algae growth most likely to contribute to high effluent TTS?

Back 40

Summer

Front 41

A faculative pond has a pH of 8.5 and an abundance of green algae The hydraulic detention time is less than 10 days The influent ammonia concentration is 25 mg/L as N and the final effluent concentration is 8 mg/L as N What is the primary method of ammonia removal under these operating conditions?

Back 41

Volatileization to atmosphere

Front 42

Calculated detention times and actual detention times are nearly identical for pond systems true or false

Back 42

False actual detention times are shorter because of incomplete mixing

Front 43

Dike slopes are steeper on the outside of the pond than on the inside the pond true or false

Back 43

False Dike slopes are not as steep on the outside of the pond steep slopes are harder to mow

Front 44

In general larger ponds require larger rocks for short protection true or false

Back 44

True

Front 45

an operator notices several large bald patches on the top of a dike where the grass no longer grows it is almost winter and heavy snows are likely The operator should?

Back 45

Place a layer of gravel over the bald areas

Front 46

Vegetation should be removed from the shoreline and grass kept neatly trimmed to?

Back 46

Make the pond inhabitable to burrowing animals

Front 47

Freeboard

Back 47

Distance from top of water to top of dike

Front 48

Riprap

Back 48

Loose stone placed to prevent erosion

Front 49

Fetch

Back 49

Distance wind travels over the water

Front 50

Emergent plant

Back 50

Plant that grows in shallow water

Front 51

Bentonite

Back 51

Clay mineral used for lining ponds

Front 52

PRV

Back 52

Prevents ballooning of pond liner

Front 53

Impermeable

Back 53

Water cannot pass through it

Front 54

Reprap should extend at least ____ft above and below the minimum and maximum water levels.

Back 54

1ft

Front 55

When driving vehicles on the top of a pond dikes, operators should _____ to minimize erosion.

Back 55

Very driving patterns

Front 56

Dikes should be inspected at least _____ for evidence of burrowing animals

Back 56

Daily

Front 57

The primary reason for lining a pond is to?

Back 57

Prevent seepage

Front 58

an operator needs to empty a pond for repairs. They calculate the volume of the pond and determine that their de-watering pump should be able to completely empty the pond in 9 days. The water level dropped rapidly in the beginning but after 2 weeks it seems to pump isn't moving any water at all. The water level just goes below 2 ft what is most likely cause?

Back 58

Groundwater is entering the pond through an open PRV.

Front 59

A faculative pond has catalysts growing up the middle of the pond What must be true?

Back 59

Water depth at the location is less than 5 ft

Front 60

This type of liner provides the highest level of protection for groundwater

Back 60

Synthetic, plastic

Front 61

An inlet diffuser on a pond

Back 61

Distributes the influence flow across the pond

Front 62

A facultative pond has several inlet pipes at different locations and deaths. It is winter and the water temperature within the pond is 41 degrees and the influent wastewater temperature is 59 degrees. To minimize a possibility of a short circuiting which inlet pipe should be used m

Back 62

Inlet closest to the pond bottom and furthest from the outlet

Front 63

Pond outlet structures often have two pipes put together to form a T-shape to?

Back 63

Prevent settled sludge from being drawn into the pipes

Front 64

this device is placed around a pipe penetrating a dike to prevent water from traveling from one side of the dike to another?

Back 64

Seepage collar

Front 65

In general a sludge accumulates faster and ponds located in Michigan than ponds located in Alabama true or false

Back 65

True

Front 66

Algae growth causes pond pH to increase during the day true or false

Back 66

True

Front 67

The oxygen saturation concentration at 68 degrees is lower at sea level than it is in the mountains true or false

Back 67

False oxygen saturation concentrations decrease with decreasing barometric pressure (elevation)

Front 68

A pond system with three cells is currently operated in series with one primary pond. over the last few weeks temperatures have decreased and the pond has turned from green to brown. operator notices red streaks at the surface of the primary pond that resists through the late afternoon. What corrective action should the operator take to eliminate the red streaks?

Back 68

Switch from series to parallel operation

Front 69

The influent flow to a primary pond contains 250 mg/L of BOD. Influte flow rate is 1.32 mgd. How many pounds per day of BOD are entering the primary pond m

Back 69

2752 lb/d

Front 70

A wastewater pond system has four ponds that are all the same size. The design criteria for the facility state that the maximum organic loading rate to the primary pond should be kept below 36 lb/ac/d. If all of the influent BOD load is sent to one pond the loading rate will be 58.5 lb/ac/d. how many ponds should receive raw influential to keep the system within its design parameters?

Back 70

2

Front 71

The dissolved oxygen concentration will be the highest in the facultative pond when?

Back 71

The water is cold and sunlight is plentiful

Front 72

This chemical may be used to decrease effluent pH prior to discharge

Back 72

Sulfuric acid

Front 73

Sludge accumulation in a wastewater pond system will be greatest at the?

Back 73

Inlet to primary pond

Front 74

Sledge blanket debts should be checked?

Back 74

Annually

Front 75

Dies that block sunlight are approved by US EPA for use in wastewater ponds to control algae true or false

Back 75

False aqua shade and other dyes that block sunlight are not approved by US EPA for use in wastewater treatment ponds

Front 76

Sludge blanket depth should be monitored at multiple locations throughout all ponds true or false

Back 76

True

Front 77

Algae provide oxygen to aerobic and faculative ponds and?

Back 77

Contribute to effluent TSS

Front 78

3-point system is in parallel operation but dissolved oxygen concentrations in the primary cells are too low. If equipment is available the oxygen concentration could be increased by?

Back 78

Increasing cycle flow from the settling pond

Front 79

Duckweed can out compete algae for?

Back 79

Sunlight

Front 80

Which of the following algae control methods is an algistat

Back 80

Barley straw

Front 81

An example of preventative maintenance is?

Back 81

Routine lubrication of motors

Front 82

Valves and gates should be exercised?

Back 82

By completely opening and closing them several times

Front 83

Burrowing animals must be removed

Back 83

As soon as they are noticed

Front 84

Before using any herbicide to control visitation at WRRF

Back 84

Operator should contact their regulatory agency for guidance

Front 85

Once a regulatory agency has approved and herbicide for use it may be used again in the future true or false

Back 85

False regulations change over time a chemical applied last season or last week may no longer be on the approved list

Front 86

An effective method for resettling floating sludge is to spray it with a high pressure hose true or false

Back 86

True