California Wastewater Grade I

Front 1

Why must proper DO level be maintained in an aeration tank

Back 1

So the solids will settle properly and the plant effluent will be clear

Front 2

Why should weirs installed at the outlet or effluent end of the aeration tank be level?

Back 2

To prevent short circuiting and an uneven distribution of solids in the effluent

Front 3

How can the mixed liquor suspended solids in the aeration tank be increased?

Back 3

By reducing the the sludge wasting rate

Front 4

What is bound water?

Back 4

Water contained within the cell mass of sludges or strongly held on the surface of colloidal particles.

Front 5

What are raw sludge and scum?

Back 5

Settled sludge solids that are removed from the bottom and floating scum removed from the top of clarifiers.

Front 6

What is the purpose of a vacuum relief valve on an anaerobic sludge digester?

Back 6

Relieves excessive vacuums so the digester cover will not collapse.

Front 7

Which item is the key to successful digester operation?

Back 7

Volatile acid/alkalinity relationship

Front 8

Successful operation of a surface discharge system depends on which factor?

Back 8

Conscientious operators using proper techniques for sampling and analysis

Front 9

What type of emergency operating equipment should be available for pumped discharge systems when there is loss of power?

Back 9

Standby generators.

Front 10

What is a representative sample?

Back 10

A sample portion of material water or was test ream that is as nearly identical in content as possible to that in the larger body being sampled.

Front 11

Best way of protection against the risk of infections?

Back 11

Hygiene.

Front 12

What is the ideal method of dealing with any high noise environment?

Back 12

The elimination or reduction of all sources through feasible engineering or administrative controls.

Front 13

What is the apparent cause of drowning when somebody falls into a diffused aeration tank?

Back 13

There is nothing to grab hold of to keep afloat or to pull oneself out of the aerator.

Front 14

If your hands may come in contact with wastewater or sludge during sampling how can you prevent the spread of disease?

Back 14

Wear disposable impervious gloves

Front 15

Which materials are consumed by a class b fire?

Back 15

Flammable and combustible liquids.

Front 16

Why is a good maintenance program essential for a wwtp?

Back 16

To operate continuously at peak design efficiency.

Front 17

How can pipelines that carry chlorine gas be purged to remove moisture?

Back 17

By using either dry air or nitrogen.

Front 18

Why do very few maintaince workers do the actual electrical repairs or troubleshooting?

Back 18

Because this is a highly specialized field and unqualified people can injure and damage equipment.

Front 19

What is voltage?

Back 19

The electrical pressure avaliable to cause a flow of current when the circuit is closed.

Front 20

What is a fuse?

Back 20

A protective device having a strip or wire of fusible metal, which when placed in a circuit, will mention and break the electric circuit when subjected to an excessive temp.

Front 21

When two or more pumps of the same size are installed why should they be operated alternately?

Back 21

To equalize wear, keep the motor windings dry, qnd distribute lube in the bearings.

Front 22

What do flow measurement transmitter instruments do?

Back 22

Send the flow variable to another device for conversion to a usable number

Front 23

Why should operators review the plans and specifications for pumps and lift stations?

Back 23

To be sure adequate provisions have been made for the station pumps, equipment, and instrumentation to be easily and properly operated and maintained.

Front 24

In chemistry, to what does normality (N) mean?

Back 24

Solution strength.

Front 25

What does the digester supernatant solids test measure?

Back 25

The percent of settable solids being returned to the plant headworks.

Front 26

Why should chlorine residual be removed before final discharge to a receiving stream?

Back 26

Protection of fish and other aquatic life.

Front 27

What is aseptic?

Back 27

Free from living germs of disease, fermentation or pure faction. Sterile.

Front 28

What does a SCADA system do?

Back 28

Collects, stores and analyzes information about all aspects of O and M, transmits alarm signals when needed, and allows fingertip controls of alarms equipment and processes.

Front 29

What is the median?

Back 29

The middle measurement when ranked in order of size

Front 30

What is a normal distribution of data?

Back 30

Is when the mean median and mode values are approximately the same.

Front 31

What is the main means by which operators who have information communicate with those who need it?

Back 31

Report writing.

Front 32

Recorded data should enable the operator to determine how to perform which task?

Back 32

How to operate and maintain a plant.

Front 33

What is planning?

Back 33

Determine goals, polices, procedures, and other elements.

Front 34

What is authority?

Back 34

The power and resources to do a specific job or to get that job done.

Front 35

How do you measure financial stability?

Back 35

Calculating operations ratio and coverage ratio.

Front 36

What is an operating ratio?

Back 36

A measure of the total revenues divided by the total operating expenses.

Front 37

What is SCADA

Back 37

A computer monitored alarm response and control system used to monitor and adjust the equipment.

Front 38

What is the purpose of a safety policy statement?

Back 38

To let employees know that the safety program has the full support of the agency and it's management.