Wastewater Engineering 2

Question 1

It is the modification of of conventional plug-flow process

Answer 1

Tapered Aeration

Question 2

Settled wastewater is introduced at several points in the aeration tank to equalize Food:Microbe ration, thus lowering the peak oxygen demand and peak hydraulic loads

Answer 2

Step Aeration

Question 3

Identical with conventional or tapered aeration, but uses shorter aeration times (1.5 to 4 hours) and higher F:M ratios are used

Answer 3

Modified Aeration

Question 4

Uses two separate tanks or compartments for the treatment of ww and stabilization of the activated sludge

Answer 4

Contact Stabilization

Question 5

Process is used extensively for prefabricated package plants for small communities. No primary sedimentation

Answer 5

Extended Aeration

Question 6

Process modification in which high MLSS concentrations are combined w/ high volumetric loadings. Uses turbine mixers for adequate mixing in the reactor

Answer 6

High Rate Aeration

Question 7

It is an extended aeration process consists of a ring or oval shaped channel and is equipped w/ mechanical aeration devices

Answer 7

Oxidation Ditch (Racing Track)

Question 8

Aerating the supernatant from the sludge digesters, digested sludge and a portion of RAS in a separate reaeration tank approx 24 hrs converting NH3 to NO3

Answer 8

Krauss Process

Question 9

Vertically mounted mechanical aerators are used to impart oxygen and to provide sufficient horizontal velocity to the liquids to prevent settling of solids in aeration channel

Answer 9

Carroussel Process

Question 10

Pure oxygen is used as a substitute for air in the activated sludge process

Answer 10

High purity oxygen

Question 11

It is a “fill and draw” activated sludge process for wastewater treatment system. In this system, wastewater is added in single “batch” reactor, treated to removed undesirable components and then discharged

Answer 11

Sequential Batch Reactor (SBR)

Question 12

Utilizes a solid medium on which bacterial solids are accumulated in order to maintain a high population

Answer 12

Attached Growth Process

Question 13

They are no longer used by large communities because of the extensive area required

Answer 13

Intermittent Sand Filter

Question 14

Consist if a bed of highly permeable media to w/c are attached and through w/c wastewater is percolated or trickled

Answer 14

Trickling Filter

Question 15

It is used for loadings less than 40 kg BOD5 / m3 per day

Answer 15

Low rate filters

Question 16

It is used for loadings up to 50 BOD5 / 100 m3 per day

Answer 16

Intermediate-rate Filters

Question 17

Used for loadings up to 480 kg BOD5 / m3 per day

Answer 17

High rate filters

Question 18

it is used for loadings more than 160 BOD5 / 100m3 per day

Answer 18

Roughing Filters

Question 19

the surface of the disk is covered with a biological slime similar to that on the media of a trickling filter

Answer 19

Rotating Biological Contractors (RBC)

Question 20

In a fixed-bed reactor the catalyst pellets are held in place and do not move with respect to a fixed reference frame

Answer 20

Packed bed reactor

Question 21

The solids formed when microorganisms are used to treat wastewater. it includes organisms, accumulated food materials, and waste products from the aerobic decomposition process

Answer 21

Activated Sludge

Question 22

It is to produce an extremely high quality discharge

Answer 22

Advanced waste Treatment

Question 23

The only source of oxygen is combined oxygen is combined oxygen such as that found in nitrate compounds

Answer 23

Anoxic

Question 24

Solid organic matter recovered from a sewage treatment process and used especially as fertilizer

Answer 24

Biosolids

Question 25

A substance or solution which resists changes in pH

Answer 25

Buffer

Question 26

The theoretical time water remains in a tank at a given flow rate

Answer 26

Detention time

Question 27

The removal or separation of a portion of water present in a sludge or slurry

Answer 27

Dewatering

Question 28

The monthly report required by the treatment plant's National Pollutant Discharge Elimination System (NPDES) discharge permit

Answer 28

Discharge Monitor Report

Question 29

An activated sludge process control calculation based upon the amount of food available per pound of mixed liquor volatile suspended solids

Answer 29

Food-to-microorganism ratio

Question 30

Heavy inorganic solids such as sand, gravel, egg shells, or metal fillings

Answer 30

Grit

Question 31

Water discharged from cellar and foundation drains, cooling water discharges, and drains from springs and swampy areas

Answer 31

Steady Inflow

Question 32

Those types of inflow that have a direct stormwater runoff connection to the sanitary sewer and cause an almost immediate increase in wastewater flows

Answer 32

Direct flow

Question 33

Mineral materials such as salt, ferric chloride, or treatment process

Answer 33

Inorganic

Question 34

A certificate issued by the state board of waterworks or wastewater works operators authorizing the holder to perform the duties of a wastewater treatment plant operator

Answer 34

License

Question 35

The average length of time a mixed liquor suspended solids particle remains in the activated sludge process

Answer 35

Mean Cell Residence Time

Question 36

The combination of return activated sludge and wastewater in the aeration tank

Answer 36

Mixed Liquor

Question 37

the suspended solids concentration of the mixed liquor

Answer 37

Mixed Liquor Suspended Solids

Question 38

The concentration of organic matter in the mixed liquor suspended solids

Answer 38

Mixed Liquor Volatile Suspended Solids

Question 39

The amount of oxygen required to biologically oxidize nitrogen compounds under specified conditions of time and temperature

Answer 39

Nitrogenous oxygen Demand

Question 40

Substances required to support living organisms

Answer 40

Nutrients

Question 41

The concentration of suspended solids in the sludge flow being returned from the settling tank to the head of the aeration tank

Answer 41

Return Activated Sludge Solids

Question 42

A device to measure wastewater flow

Answer 42

Weir

Question 43

It includes the availability if substrates and nutrients

Answer 43

Nutritional Factors

Question 44

It includes pH, temperature, and response to free molecular oxygen

Answer 44

Physical factors

Question 45

Acid loving organisms grow at pH values lower than 5.4

Answer 45

Acidophiles

Question 46

Grow at pH values 5.4 to 8.5

Answer 46

Neutrophiles

Question 47

Grow at pH values from 7 to 11.5

Answer 47

Alkalinophiles

Question 48

With increasing sludge age, the necessary cellular compounds needed to stick together or agglutinate

Answer 48

Floc-forming Bacteria

Question 49

These are motile or gliding filamentous organisms in the activated sludge process that contribute to settleability problems

Answer 49

Gliding Bacteria

Question 50

The feed upon dead organic matter

Answer 50

Saprophytic Bacteria

Question 51

Consist of a chain of gram-negative cells that are surrounded by a transparent tube

Answer 51

Sheath Bacteria

Question 52

Miroorganism in the activated sludge process use oxygen as they consume the substrate. The rate st which use oxygen

Answer 52

Oxygen Uptake Rate

Question 53

The combination of OUR with MLVSS

Answer 53

Specific Oxygen Uptake Rate

Question 54

A balance between floc-forming and filamentous bacteria results in strong flocs that keep their integrity in the aeration basin and settle well in the sedimentation tank

Answer 54

Normal Flocs

Question 55

It is the most predominate form of bulking that occurs and is caused by the growth of filamentous organisms or organisms that can grow in a filamentous form under adverse conditions

Answer 55

Filamentous Bulking

Question 56

It is a white or a colorless filamentous organism and is associated more commonly with fixed film system processes

Answer 56

Beggiatoa

Question 57

View the mixed liquor under the microscope to determine what type of microbial growth changes or floc structure changes can be related to the development of bulking sludge

Answer 57

Process Control

Question 58

It is caused by an excessive amount of extracellular biopolymer, which produces a sludge with a slimy jellylike consistency

Answer 58

Viscous Bulking

Question 59

Light fluffy sludge particles, small, almost transparent, very fluffy, buoyant solids particles

Answer 59

Straggler Floc

Question 60

It is the condition describing a buildup of foam or froth on the surface of the aeration tank

Answer 60

Foaming/Frothing

Question 61

A type of foam that has moderate amounts of crisp, white foam are usually associated with activated sludge processes producing an excellent final effluent

Answer 61

Fresh, crisp, white foam

Question 62

A type of foam that indicates an old sludge that is overoxidized, has a high mixed liquor concentration and has a waste rate that is too high

Answer 62

Thick, greasy, dark tan foam

Question 63

A type of foam that has a large amounts of a white, soap suds-like foam indicate a very young, underoxidized sludge

Answer 63

White Billowing Foam

Question 64

A group of filamentous, fungus like bacteria, gram positive and spore forming bacteria

Answer 64

Acinomycetes

Question 65

It is a relatively shallow body of water contained in an earthen basin of controlled shape, for the purpose of treating wastewater

Answer 65

Stabilization Ponds or Lagoons

Question 66

Shallow pond less than 1 m in depth, where dissolved oxygen is maintained throughout the entire depth by the action of photosynthesis

Answer 66

Aerobic ponds

Question 67

Deep ponds that receive high organic loading such that anaerobic conditions prevail and surface reaeration

Answer 67

Anaerobic Ponds

Question 68

The two dominant biological reactions

Answer 68

Acid formation and Methane Fermentation

Question 69

It is used to combat these odor

Answer 69

Sodium Nitrate and Grease Crusts

Question 70

the 2 types of facutative ponds

Answer 70

Primary facultative ponds and Secondary facultative ponds

Question 71

The type of facultative pond that receive settled wastewater

Answer 71

Secondary Facultative Ponds

Question 72

The type of facultative pond that receive raw wastewater

Answer 72

Primary Facultative Ponds

Question 73

1 to 2.5 m deep which have an anaerobic lower zone facultative middle zone and aerobic upper zone maintained by photosynthesis and surface reaeration

Answer 73

Facultative Ponds

Question 74

It is known as finishing or polishing ponds since they are used for polishing effluents fromother biological processes

Answer 74

Maturation or Tertiary Ponds

Question 75

Ponds oxygenated through the action of surface or diffuses air aeration

Answer 75

Aerated Lagoons

Question 76

Artificially created water bodies

Answer 76

Constructed Wetlands

Question 77

Composed of a network of sewer pipes, conduits, tunnels, structures, devices, equipment and appurtenances for the collection, transportation and pumping wastewater

Answer 77

Wastewater Collection system

Question 78

A pipe or conduit, generally closed, but normally not flowing full, when carries sewage

Answer 78

Sewer

Question 79

The entire system used for collection, treatment and disposal of wastewater. This includes pipes, manholes, and all structures used for the above mentioned purposes

Answer 79

Sewerage

Question 80

Serves all abutting properties

Answer 80

Common sewer

Question 81

Pipe conveying wastewater from an individual structure to a common sewer rot other point of disposal

Answer 81

House sewer

Question 82

No tributary flow except from house sewer

Answer 82

Lateral sewer

Question 83

Carries discharge from two or more laterals

Answer 83

Sub-main sewer

Question 84

Collects flow from several sub-mains as well as laterals and house sewers

Answer 84

Main/trunk sewer

Question 85

it's for combined sewers

Answer 85

Intercepting sewer

Question 86

It receives discharges from all collecting system and conveys it to the point of final

Answer 86

Outfall sewer

Question 87

Water which is unaccounted for in the usage of the clients

Answer 87

Loss and waste

Question 88

Transport wastewater by gravity along a downward sloping pipe

Answer 88

Gravity sewer

Question 89

Transport wastewater by pressure through pumps

Answer 89

Pressurized sewers

Question 90

Uses the differential pressure between atmospheric pressure and a partial vacuum maintained in the piping network and vacuum station collection vessel.

Answer 90

Vacuum sewers

Question 91

Using unit values for plumbing fixtures

Answer 91

Fixture unit flow

Question 92

Using population of a community to determine the flow rate

Answer 92

Average per capita flow

Question 93

Using the peak flow for the process of activity involved

Answer 93

Industrial wastewater flow

Question 94

A device meant to admit the storm water or surface wash and convey it into a storm sewer or a combined sewer

Answer 94

Inlets

Question 95

A special type of inlet in which a basin is provided which allows grit, sand and debris flowing in with storm water settle out

Answer 95

Catch basin

Question 96

Located at the junction of sewers and changes in grades, sizes or alignment

Answer 96

Manhole

Question 97

The one which are about 0.75 to 0.9m I depth; Type of manhole

Answer 97

Shallow manholes

Question 98

Those which are about 1.5 m in depth; Type of manhole

Answer 98

Normal manholes

Question 99

Deeper than 1.5 m; Type of manhole

Answer 99

Deep manholes

Question 100

A special type of manhole on a sewer line which is constructed to provide a connection between a high level branch sewer to a low level main sewer

Answer 100

Drop manholes

Question 101

Special openings, constructed to join a hole in the sewer and the ground for the purpose of lowering a lamp inside a sewer

Answer 101

Lamp hole

Question 102

Holds water and then throws it into sewer for the purpose of flushing it

Answer 102

Flushing tanks

Question 103

To exclude grease and oil from sewage before they enter the sewer line

Answer 103

Grease and oil traps

Question 104

Sewer lines dips below the hydraulic grade line

Answer 104

Inverted siphon

Question 105

Barrier of earth or concrete erected between the watercourse and property to be protected

Answer 105

Leeves and floodwalls

Question 106

Reduce flooding by temporarily storing flood waters behind dams or in storage or detention basins

Answer 106

Reservoirs and detention

Question 107

New channel that sends floodwaters to a different location

Answer 107

Diversion

Question 108

Excavation activity usually carried out underwater, in shallow seas or freshwater areas w/ the purpose of gathering up bottom sediments and widening

Answer 108

Dredging

Question 109

Method of river engineering that widens or deepens rivers to increase the capacity for flow volume at specific sections of the rivers

Answer 109

Channelization

Question 110

Revised Effluent Regulations of 1990

Answer 110

DAO35

Question 111

Protected waters cause it requires disinfection to meet requirements

Answer 111

Class AA

Question 112

Could be drinkable but requires complete treatment

Answer 112

Class A

Question 113

ntended for primary contact

Answer 113

Class B

Question 114

for fishery, boating activities or agriculture

Answer 114

Class C

Question 115

navigable waters

Answer 115

Class D