Wastewater

Front 1

Max Withdrawl of a 1 ton CL2 cylinder

Back 1

8 Lbs

Front 2

Total Coliform NPDES approved procedures

Back 2

MF and MPN

Front 3

Depth Range of synthetic media of a trickling filter

Back 3

15-30 feet

Front 4

Settling tank detention time

Back 4

2-3 hours

Front 5

Nitrification

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NH3 to NO2 to NO3

Front 6

Denitrification

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NO3 to N2 (gas)

Front 7

How deep are shallow lagoons

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3-6 feet

Front 8

What does SCADA stand for?

Back 8

Supervisory Control and Data Acquisition

Front 9

Primary detention time

Back 9

1.5 to 2 hours

Front 10

What does tertiary treatment remove?

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Suspended solids, nitrogen, and phosphorus

Front 11

Grit channel flow

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1 fps

Front 12

Most common activated sludge plant

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A package plant

Front 13

Avg community BOD and TSS

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BOD = 200 mg/L

TSS = 240 mg/L

Front 14

Velocity of sampler tubing of 2-5 fps produces what?

Back 14

Calcium

Front 15

5 stages of a construction zone

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Advanced warning area, transition area, buffer space, work area and termination area

Front 16

Best method for grit removal

Back 16

Reduce the velocity of wastewater

Front 17

What gases are produced when no DO is present in pre-treatment?

Back 17

Methane and Hydrogen Sulfide

Front 18

Comminutors are a combo of what?

Back 18

Screen and grinder

Front 19

Diffused air system normal range of air application rate

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0.5 to 1.0 ft3 of air per gallon of wastewater

Front 20

As temperature of water increases the settling rate of what does what?

Back 20

Increases

Front 21

What happens if you breathe in too much hydrogen sulfide

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Bronchitis and pulmonary edema

Front 22

Typical safety factor to determine the size of an equalization tank

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10-20% of the calculated volume of the tank

Front 23

F/M ratio optimal range

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.2-.5

Front 24

What does ORP stand for?

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Oxidation-reduction potential

Front 25

Major causes of abnormal operations

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Hydraulics, water quality, equipment malfunctions, plant changes, process controls, environmental changes and design deficiencies

Front 26

2 types of foams

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Unstable and persistent

Front 27

What causes unstable foam?

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Nutrient deficiencies, recycled solids, or polymer overdosing

Front 28

What causes persistent foam?

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Process imbalance

Front 29

Sludge blanket desired in the secondary clarifier

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1 to 3 feet

Front 30

3 types of filamentous bacteria that cause foaming in an aeration tank

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Nocardia, M. Parvicella, and 1863

Front 31

Protoza (single-celled and heterotrophs) 3 groups

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Amoeba, flagellate, and Ciliate

Front 32

What are rotifers a sign of?

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Old activated sludge with a high MCRT

Front 33

3 types of bacterial cells

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Coccus, bacillius, and spirillum

Front 34

4 phases of bacterial growth over time

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Lag, log, stationary, and death

Front 35

Which microorganisms don't have cells?

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Viruses

Front 36

What microorganisms are of importance to the activated sludge process

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Bacteria, protozoans, rotifiers, viruses, fungi, and algae

Front 37

What microorganisms do you see in large quantities of when the MCRT or SRT of the process is at the proper level?

Back 37

Stalked ciliates

Front 38

What kind of diffusers are more prone to fouling and require more frequent maintenance?

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Porous diffusers

Front 39

Which item is crucial in meeting secondary clarifier effluent requirements?

Back 39

Solids loading rate

Front 40

Typical SRT value for a conventional ASP designed for BOD only removal

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1 to 5 days

Front 41

When is the Kraus process used?

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Nitrogen deficient wastewater and sludge has poor settling characteristics

Front 42

2 major groups of variables that affect an ASP

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Collection system variables and treatment plant variables

Front 43

What will prevent the formation of sludge deposits that could become septic in channels and pipelines?

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A velocity over 1.5 ft/sec

Front 44

2 types of sludge collection tubes with a pumping system

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A rake system and suction tubes with a pumping system

Front 45

What does RBC stand for?

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Rotating Biological Contactors

Front 46

CT for RBC's tanks

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1 to 4 hours

Front 47

% of RBC that is typically submerged

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40%

Front 48

What action provides the media with another chance to feed on remaining pollutants and maintains a minimum amount of flow through the media?

Back 48

Recirculation

Front 49

What media can be used as a direct replacement for rock media?

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Random media

Front 50

Why is it essential that sludge be removed quickly from the secondary clarifier?

Back 50

To avoid gasification and denitrification

Front 51

What is looping of A RBC?

Back 51

Unbalanced rotation of the RBC shaft

Front 52

What indicates the front of an RBC reactor might be overloaded?

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Excess biofilm thickness in the first stages of the reactor

Front 53

Which treatment process is the most complex to operate?

Back 53

IFAS

Front 54

Why must both MBBR and IFAS processes be operated at a higher DO concentration than conventional activated sludge?

Back 54

A greater driving force is needed to diffuse oxygen through the biofilm compared to a dispersed floc

Front 55

OSHA's permissible exposure limit for chlorine gas

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1 ppm

Front 56

What is the point of evaporators in chlorine systems?

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To vaporize liquid chlorine

Front 57

Max temperature a chlorine cylinder should be stored

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100 degrees F or 43 degrees C

Front 58

How often should operators exercise all the valves on the evaporator?

Back 58

Monthly

Front 59

Why are contact basins unnecessary for declaration with sulfur dioxide?

Back 59

Relatively short reaction time

Front 60

What happens to heavy solids that settle to the bottom of a lagoon?

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The are decomposed anaerobically by bacteria

Front 61

Physical factors that contribute to varying treatment efficiencies in lagoons

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Sunlight, surface area, and temperature

Front 62

Warning that pH of the lagoon could change in a day or two if corrective action is not taken

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Change in alkalinity

Front 63

What do subscript numbers in chemical formulas indicate?

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Number of atoms

Front 64

What is specific conductance?

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A numerical expression of the ability of a water or wastewater sample to conduct an electrical currant

Front 65

What does the alkalinity of a water or wastewater sample measure?

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It's capacity to neutralize acids

Front 66

What is Total Kjeldahl Nitrogen?

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Sum of organic nitrogen and ammonia nitrogen

Front 67

What does the presence of E. Coli indicate?

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Fecal contamination and the possible presence of disease causing organisms