Waste Water

Front 1

What are some of the dissolved substances in water?

Back 1

Hydrogen oxygen calcium carbon magnesium sodium chloride sulfate iron nitrogen phosphorus and organic materia

Front 2

List for types of pollution?

Back 2

Organic in organic thermal radioactive pollution

Front 3

What kind of bacteria cause hydrogen sulfide gas to be released?

Back 3

Hydrogen sulfide gas is produced by anaerobic bacteria

Front 4

What do total solids consist of?

Back 4

Dissolved and suspended solids

Front 5

Imhoff cone is used to measure blink solids

Back 5

Settleable solids must be measured to determine the efficiency of settling basins

Front 6

Why should an operator have an understanding of natural cycles?

Back 6

In order to control waste water treatment processes and odors and also to protect receiving waters

Front 7

What does NPDES stand for?

Back 7

National pollutant discharge elimination system

Front 8

Name three types of sewers?

Back 8

Sanitary storm and combined sewers

Front 9

Why are combined sewer is a problem?

Back 9

In a system using combined sewers flows sometimes may become overloaded during storms due to an adequate capacity this could Allow part Ashley treated ways to be discharge into receiving waters as a result of attempting to treat extreme hydraulic overloads

Front 10

What is usually done with grit that has been removed from a wastewater plant?

Back 10

Grit removed from waste water is usually buried to avoid nuisance conditions

Front 11

What is the purpose of flights or plows in a clarifier?

Back 11

Lights in a rectangular tanks move scum along the surface to a scum trough and push ledge along the bottom to a hopper for removal to the sludge handling facility. Plows scraped sludge along the bottom of the circular tanks to hopper for removal

Front 12

What happened to the sludge and scam collected in a primary clarifier?

Back 12

Sludge in scam are usually pump to sludge handling facilities such as digesters.

Front 13

Why is a secondary clarifier needed after a trickling filter rotating biological contactor or aeration tank?

Back 13

To allow organisms in treated wastewater to be removed by settling.

Front 14

Activated sludge can be pumped from the secondary clarifier to?

Back 14

From the secondary clarifier to either the primary clarifier or waste sludge handling facility.

Front 15

What two basic types of bacteria are present in an anaerobic digester?

Back 15

One a group that eats organic sludge to form organic acids and carbon dioxide gas Called acid formers to a group that breaks down the organic acids into simpler compounds in forms methane and carbon dioxide gas also called gas formers.

Front 16

Why are digesters mixed?

Back 16

Digesters are mixed to bring food in organisms together provide a uniform temperature and prevent the formation of a scum blanket.

Front 17

List some of the ways to D water and dispose of digested sludge?

Back 17

Digestive sludge may be dewatered by using sludge or sand drain beds lagoons centrifuges, vacuum filters or filter presses. Ultimately the dried sludge may be used as soil conditioner or it may be buried

Front 18

How are ponds similar to primary clarifier’s?

Back 18

When wastewater is discharged to a pond the settable solids fall to the bottom just as they do in a primary clarifier.

Front 19

How are ponds similar to anaerobic digester‘s?

Back 19

The solids begin to decompose and soon use up all the dissolved oxygen in the nearby water. A pollution of anaerobic bacteria then continues the decomposition much the same as an anaerobic digester

Front 20

How are ponds similar to trickling filters or aeration tanks?

Back 20

Anaerobic bacteria algae and other micro organisms feed on dissolved solids in the upper layer of the pond similar to the way they do in trickling filter or aeration tanks.

Front 21

List as many advanced waste treatment methods as you can remember.

Back 21

Coagulation sedimentation membranes, filtration, absorption, electrodialysis, reverse osmosis, chemical oxidization, and polymers

Front 22

List as many advanced waste treatment methods as you can remember.

Back 22

Coagulation sedimentation membranes, filtration, absorption, electrodialysis, reverse osmosis, chemical oxidization, and polymers

Front 23

Which would provide better chlorine contact a 10,000 gallon cubicle tank or a length of 10 inch pipe flowing for and containing the same volume as the cubicle tanks?

Back 23

The pipe will provide better chlorine contact because Water cannot short circuit through a pipe while it might not move evenly through the tank and that some of the water would have a shorter contact time.

Front 24

List as many advanced waste treatment methods as you can remember.

Back 24

Coagulation sedimentation membranes, filtration, absorption, electrodialysis, reverse osmosis, chemical oxidization, and polymers

Front 25

Which would provide better chlorine contact a 10,000 gallon cubicle tank or a length of 10 inch pipe flowing for and containing the same volume as the cubicle tanks?

Back 25

The pipe will provide better chlorine contact because Water cannot short circuit through a pipe while it might not move evenly through the tank and that some of the water would have a shorter contact time.

Front 26

How can screenings be disposed of?

Back 26

Covering them with a minimum of 6 inches 15 cm of earth or by incineration.

Front 27

List as many advanced waste treatment methods as you can remember.

Back 27

Coagulation sedimentation membranes, filtration, absorption, electrodialysis, reverse osmosis, chemical oxidization, and polymers

Front 28

Which would provide better chlorine contact a 10,000 gallon cubicle tank or a length of 10 inch pipe flowing for and containing the same volume as the cubicle tanks?

Back 28

The pipe will provide better chlorine contact because Water cannot short circuit through a pipe while it might not move evenly through the tank and that some of the water would have a shorter contact time.

Front 29

How can screenings be disposed of?

Back 29

Covering them with a minimum of 6 inches 15 cm of earth or by incineration.

Front 30

How are comminution units different from bar racks and bar screens?

Back 30

Bar racks and screens remove debris from the waste water while comminution units grind up debris and leave it in the waste water.

Front 31

List as many advanced waste treatment methods as you can remember.

Back 31

Coagulation sedimentation membranes, filtration, absorption, electrodialysis, reverse osmosis, chemical oxidization, and polymers

Front 32

Which would provide better chlorine contact a 10,000 gallon cubicle tank or a length of 10 inch pipe flowing for and containing the same volume as the cubicle tanks?

Back 32

The pipe will provide better chlorine contact because Water cannot short circuit through a pipe while it might not move evenly through the tank and that some of the water would have a shorter contact time.

Front 33

How can screenings be disposed of?

Back 33

Covering them with a minimum of 6 inches 15 cm of earth or by incineration.

Front 34

How are comminution units different from bar racks and bar screens?

Back 34

Bar racks and screens remove debris from the waste water while comminution units grind up debris and leave it in the waste water.

Front 35

What are the advantages of comminution Machines over screens?

Back 35

The elimination of screenings disposal flies and odor problems it is disadvantage is that the plastics in the woods may be rejected and must be removed manually

Front 36

List as many advanced waste treatment methods as you can remember.

Back 36

Coagulation sedimentation membranes, filtration, absorption, electrodialysis, reverse osmosis, chemical oxidization, and polymers

Front 37

Which would provide better chlorine contact a 10,000 gallon cubicle tank or a length of 10 inch pipe flowing for and containing the same volume as the cubicle tanks?

Back 37

The pipe will provide better chlorine contact because Water cannot short circuit through a pipe while it might not move evenly through the tank and that some of the water would have a shorter contact time.

Front 38

How can screenings be disposed of?

Back 38

Covering them with a minimum of 6 inches 15 cm of earth or by incineration.

Front 39

How are comminution units different from bar racks and bar screens?

Back 39

Bar racks and screens remove debris from the waste water while comminution units grind up debris and leave it in the waste water.

Front 40

What are the advantages of comminution Machines over screens?

Back 40

The elimination of screenings disposal flies and odor problems it is disadvantage is that the plastics in the woods may be rejected and must be removed manually

Front 41

What has replaced mercury seals in comminutors?

Back 41

Mechanical seals

Front 42

List as many advanced waste treatment methods as you can remember.

Back 42

Coagulation sedimentation membranes, filtration, absorption, electrodialysis, reverse osmosis, chemical oxidization, and polymers

Front 43

Which would provide better chlorine contact a 10,000 gallon cubicle tank or a length of 10 inch pipe flowing for and containing the same volume as the cubicle tanks?

Back 43

The pipe will provide better chlorine contact because Water cannot short circuit through a pipe while it might not move evenly through the tank and that some of the water would have a shorter contact time.

Front 44

How can screenings be disposed of?

Back 44

Covering them with a minimum of 6 inches 15 cm of earth or by incineration.

Front 45

How are comminution units different from bar racks and bar screens?

Back 45

Bar racks and screens remove debris from the waste water while comminution units grind up debris and leave it in the waste water.

Front 46

What are the advantages of comminution Machines over screens?

Back 46

The elimination of screenings disposal flies and odor problems it is disadvantage is that the plastics in the woods may be rejected and must be removed manually

Front 47

What has replaced mercury seals in comminutors?

Back 47

Mechanical seals

Front 48

Why bother to remove grit

Back 48

Great must be removed for rent where in pumps, plugged lines, and other occupation of valued space in Digesters.

Front 49

How can you control the velocity in a grit channel in order to maintain a velocities within a range of approximately 0.7 to 1.4 ft./s?

Back 49

Vary in the number of channels in service in a multiple channel insulation. Use of proportional weirs.Using bricks or cinderblocks to change the cross-sectional shape or area of the great channels however this can cause cleaning maintenance and operational problems.

Front 50

A stick travels 20 feet in 40 seconds in a grit channel what is the velocity in a channel?

Back 50

The velocity of a stick that travels 20 feet in 40 seconds in the grit channel is 0.5 ft./s

Front 51

A stick travels 20 feet in 40 seconds in the grit channel what correct of action should be taken if any?

Back 51

Increase velocity to keep lighter organic solids moving.

Front 52

List the safety hazards that might be encountered while manually cleaning a grit channel?

Back 52

Slipping or back injury or hazards that might be encountered when manually cleaning a grit channel also beware of dangerous gases when working in a covered grit channel there have been instances of gasoline or similar material is leaking into a sewer and creating a potentially explosive hazard

Front 53

List the safety hazards that might be encountered while manually cleaning a grit channel?

Back 53

Slipping or back injury or hazards that might be encountered when manually cleaning a grit channel also beware of dangerous gases when working in a covered grit channel there have been instances of gasoline or similar material is leaking into a sewer and creating a potentially explosive hazard

Front 54

What is the purpose of a Cyclone grit separator?

Back 54

The purpose of a cyclones grit separator is two separate grit from organic material and waste water.

Front 55

List the safety hazards that might be encountered while manually cleaning a grit channel?

Back 55

Slipping or back injury or hazards that might be encountered when manually cleaning a grit channel also beware of dangerous gases when working in a covered grit channel there have been instances of gasoline or similar material is leaking into a sewer and creating a potentially explosive hazard

Front 56

What is the purpose of a Cyclone grit separator?

Back 56

The purpose of a cyclones grit separator is two separate grit from organic material and waste water.

Front 57

List the possible safety hazards in operator may encounter when working around a cyclone grit separator?

Back 57

Electric hazards, slowly moving screw conveyors and other equipment, lifting heavy parts and materials, several slippery surfaces

Front 58

List the safety hazards that might be encountered while manually cleaning a grit channel?

Back 58

Slipping or back injury or hazards that might be encountered when manually cleaning a grit channel also beware of dangerous gases when working in a covered grit channel there have been instances of gasoline or similar material is leaking into a sewer and creating a potentially explosive hazard

Front 59

What is the purpose of a Cyclone grease separator?

Back 59

The purpose of a cyclones grit separator is two separate grit from organic material and waste water.

Front 60

List the possible safety hazards in operator may encounter when working around a cyclone grit separator?

Back 60

Electric hazards, slowly moving screw conveyors and other equipment, lifting heavy parts and materials, several slippery surfaces

Front 61

Why is it necessary or desirable to wash grit?

Back 61

Grit is washed to remove organic material before disposal if the organic matter is not removed and odors could develop if used as a filter material the filter could settle with organic decompose

Front 62

Name the maintenance steps for a grit washer?

Back 62

Inspected facility for corrosion damage, examining moving parts for where, repairing or replacing any worn or corroded parts, painting any parts that could corrode, oiling and greasing equipment in accordance with the Plant o and M manual and the manufactures instructions

Front 63

Your plant has an average flow of 2.0 MGD. An average of 6 cu ft of grit is removed each day how many cubic foot of grit per million gallons of flow are removed?

Back 63

Back (Definition)

Front 64

Your plant has an average flow of 2.0 MGD. An average of 6 cu ft of grit is removed each day how many cubic foot of grit per million gallons of flow are removed?

Back 64

Back (Definition)

Front 65

What kind of problems can be created for the operator when screens or comminutors are overloaded or bypassed?

Back 65

Sticks and rags can foul the Ross leg pumps from the primary clarifier, debris can plug the orifices in trickling filter distributors, debris can interfere with air diffusers in the aeration tanks of activated sludge plants, Floating debris can appear in the chlorine contact basin and leave the plant in the final effluent, solids can plug return sludge pumps and flow meters in activated sludge plants

Front 66

What items would you check when reviewing the plans and specifications for racks and screens?

Back 66

Back (Definition)