Wastewater Treatment

Front 1

A condition common to lightly loaded, shallow lagoons is

Back 1

The growth of filamentous algae and moss

Front 2

To reduce odors from a lagoon, an operator may wish to consider

Back 2

Aeration and chlorination

Front 3

The performance of a lagoon is influenced by

Back 3

Type of soil, depth

Surface area, wind action

Sunlight, temperatures

Characteristics of influent

Front 4

Ponds may be classified according to detention time. A pond with a detention time of less than three days will perform in ways similar to

Back 4

A sedimentation process

Front 5

Duckweed

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Impedes sunlight penetration and hinders surface aeration

Front 6

Tests such as DO, PH, and temperature indicate the _________ of a lagoon, while tests such as BOD, coliform and solids indicate the _________ of a lagoon.

Back 6

Condition/Efficiency

Front 7

To test a lagoon for PH, dissolved oxygen or temperature, an operator would take

Back 7

A grab sample

Front 8

One role of algae in a wastewater stabilization pond is to

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Provide oxygen for other biological life

Front 9

Ideal organic loading for a facultative lagoon system without mechanical aeration is

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50 lbs/acre/day BOD

Front 10

At what time of the day is the D.O. in a lagoon the lowest

Back 10

Sunrise

Front 11

BOD is

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Biochemical Oxygen Demand

Front 12

During the day algae _________ the PH of a pond while at night they _________ the PH

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Raise, Lower

Front 13

A submerged inlet to a pond or lagoon

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Minimizes floating material, conserves pond heat

Front 14

What effect does algae growth have on a lagoon during daylight hours

Back 14

Increase DO concentration

Front 15

Lagoons are primarily

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Ponds with aerobic and anaerobic character

Front 16

Poor lagoon effluent quality can be caused by

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Low temperatures

Front 17

If the water in your lagoon has a PH of 7.0 it is

Back 17

Neutral

Front 18

Most facultative Ponds have an operating depth of

Back 18

6-12 ft

Front 19

What effect does temperature have on oxygen solubility

Back 19

As temperature increases, solubility decreases

Front 20

The perimeter of a lagoon should be kept of weeds to

Back 20

Discourage mosquito breeding and scum accumulation

Front 21

The velocity of the wastewatervthrough a grit chamber should be

Back 21

1.0 ft/sec

Front 22

Grit removal involves removing what

Back 22

Heavy inorganic waste such as sand or gravel

Front 23

Grease removal in the treatment process is best accomplished in

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Preliminary treatment

Front 24

Comminutors are devices which

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Act both as a cutter or shredder and a screen

Front 25

Two common methods of disposing of screenings are

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Burying and incineration

Front 26

Grit should be removed to

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Prevent wear on pumps and plugging of lines

Front 27

Comminutors are typically included in the treatment process to

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Reduce the size of influent solids

Front 28

The appearance of raw primary sludge should be

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Gray with foul odor

Front 29

Putrefecation occurs when

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Organic matter decays anaerobically

Front 30

Heterotrophs, as opposed to Autotrophs

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Utilize primarily organic sources for energy and reproduction

Front 31

Algae are

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Microscopic plants

Front 32

________ has no effect on the trickling filter process

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Sunlight

Front 33

Bacteria not commonly found in wastewater

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Systolic

Front 34

Bacteria which normally live off dead organic matter are called

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Saprophytic

Front 35

Least common microorganism found in an activated sludge mixed liquor

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Algae

Front 36

Organisms essential to wastewater treatment processes include

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Saprophytes

Front 37

Pathogenic organisms are

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Organisms which cause disease

Front 38

Unpleasant odors at a wastewater treatment plant are generally caused by

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Anaerobic bacteria

Front 39

Before working on a trickling filter you should first

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Shut all flow to unit

Front 40

The main purpose for written standard operating procedures are

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Safety and training

Front 41

When you are concerned with the chemical which you are using at your plant, you should first reference

Back 41

MSDS

Front 42

The melting point of the fusible plug on a chlorine cylinder is

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158 - 165 degrees F

Front 43

Oil soaked rags should be

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Stored in a metal container until disposed of

Gathered and disposed of ad hazardous material

Front 44

If you encounter a fire near electrical contacts, you should utilize _________ type of fire extinguisher

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Carbon dioxide or halon

Front 45

Whenever you are working on electrical equipment, always

Back 45

Work in pairs

Make sure you are grounded

Turn off the electricity

Front 46

Before entering a confined space or sewer manhole

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Test atmosphere for oxygen deficiency and explosiveness

Provide ventilation

Have a second person and safety harness ready for use

Provide adequate barricades and warning devices around confined space

Front 47

Used to express flow rates

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Cfs

Front 48

The head on the submersible pump sewage lift station is the

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Discharge head plus friction head

Front 49

The formula Flow (gpm) x H (ft) / 3960 (E) is used to calculate

Back 49

Water horsepower

Front 50

When replacing packing in a pump, the ________ should be inserted between the rings of packing

Back 50

Lantern ring

Front 51

A pump frequently used for handling strong and toxic chemicals is the

Back 51

Diaphragm pump

Front 52

Mechanical seals consist of two subassemblies which are

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Rotating ring assembly and the stationary assembly

Front 53

Chlorine reacts with nitrogenous compounds in water to form

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Chloramines

Front 54

Chlorine is chemical that is

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Non-flammable but will support combustion

Front 55

Chlorine is corrosive when combined with

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Moisture

Front 56

Excess chlorine going from your plant to the receiving stream

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Will harm aquatic growth

Front 57

Chlorine is

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A toxic, greenish yellow gas which is 2.5 times heavier then air

Front 58

The purpose for limiting withdrawal rates of gaseous chlorine from 150lbs cylinders is because high rates of withdrawal causes

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Freezing of equipment

Front 59

Repairs to a one ton chlorine cylinder should be made with a

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Class B repair kit

Front 60

Chlorine is used in wastewater for

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Control digester foaming

Odor prevention

Filamentous control

Disinfection

Front 61

Formula for dosage

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Dosage = Residual + Demand

Front 62

Chlorine reduces compounds by

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Oxidation

Front 63

Used to remove chlorine

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Sulfur dioxide

Front 64

When chlorine is added to wastewater, what compounds are formed

Back 64

Trichloramine

Monochloramine

Dichloramine

Front 65

Chlorine feed

Back 65

The ejector creates a vacuum that causes the chlorine to be pulled into the solution water

Front 66

Chlorination will

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Reduce BOD

Front 67

How many fusible plugs are found on a one ton chlorine cylinder

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6

Front 68

The purpose of screening is to

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Remove large objects and debris from influent

Front 69

The purpose of disinfection in wastewater treatment is

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The reduce pathogens

Front 70

The characteristics of wastewater (such as PH, B.O.D.) that is being discharged from a plant are commonly recorded on

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A DMR

Front 71

Nitrifying bacteria are important in treating

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Ammonia

Front 72

The presence of a rotten egg smell is caused by

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Hydrogen sulfide gas

Front 73

Septic is defined as

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A condition produced by anaerobic bacteria

Front 74

A proportional weir is specially designed to

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Have the flow through the weir directly proportional to the head

Front 75

P.O.T.W stans for

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Publicly owned treatment works

Front 76

A buffer is defined as

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A solution or liquid which can neutralize acids or bases

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Sedimentation is considered a part of

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Secondary treatment

Front 78

Sewers are classified as

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Sanitary, storm, combined

Front 79

Primary clarifiers commonly

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Reduce the BOD

Front 80

PH is measured within a range of

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