Wastewater Treatment Class I
a) alert the operator on duty
Always alert the operator on duty before shutting down any equipment so as to prevent the possibility
of harming personnel or affecting process performance as a result of the shutdown. Ans- The first step
the maintenance staff should ...
Wastewater Treatment Class I
a) alert the operator on duty
Always alert the operator on duty before shutting down any equipment so as to prevent the possibility
of harming personnel or affecting process performance as a result of the shutdown. Ans- The first step
the maintenance staff should take in properly locking and tagging out a piece of equipment is to...
a) alert the operator on duty
b) turn the equipment off at the motor control center (MCC)
c) pull the switch on the electrical panel to "OFF"
d) fill out the tags
b) secured together
If two or more floor coverings are required, secure them together to prevent trips and falls from the
coverings separating. Ans- When working in an area with two or more floor coverings, be sure that they
are always...
a) overlapping one another
b) secured together
c) separated from one another
d) at the entrances and exits only
,c) keep it close to your body and use leg strength
When lifting any object manually, use your legs and keep the object close to to your body in order to
minimize the risk of back injury. Ans- When manually lifting any object, be sure to...
a) hold it at arm's length
b) keep your back bent and hold it low
c) keep it close to your body and use leg strength
d) keep your knees locked and bend at the waist
a) 19.5%
The quality of air in a confined space is of utmost importance. Ambient air contains approximately 21%
oxygen and atmospheres with oxygen concentrations below 19.5% are considered unsuitable for
occupancy. Levels below 19.5% can lead to injury, loss of consciousness or death. Ans- Oxygen
deficiency becomes a concern when the oxygen level in a confined space is less than...
a) 19.5%
b) 22.5%
c) 25.5%
d) 28.5%
d) MSDS
,Material Safety Data Sheets provide information on chemical hazards, and health, safety and
environmental concerns of chemicals. Ans- Which of the following provides safety information for
potentially hazardous or toxic materials?
a) CERCLA
b) OSHA
c) CFR
d) MSDS
b) 2-5 mg/L
While many facilities operate in a range of 1-4 mg/L, the optimum range of DO for a conventional
activated sludge facility is 2-5 mg/L Ans- Conventional activated sludge systems typically operate with a
DO range of...
a) 0-1 mg/L
b) 2-5 mg/L
c) 4-7 mg/L
d) 7-9 mg/L
a) screenings
Large debris, large floating solid material, and fibrous material are categorized as screenings. It is
necessary to remove this material before the wastewater reaches any pumps or equipment in order to
, prevent damage. Ans- Large debris (sticks, rocks, etc), large floating solids, and fibrous materials (rags,
strings, cloths, etc.) are categorized as...
a) screenings
b) scum
c) grit
d) floc
b) centrifugal
Centrifugal pumps are primarily used for transporting influent and effluent wastewater. Positive-
displacement pumps, such as a progressing cavity pump, are used to transport sludge. Ans- Pumps are
often required to bring wastewater into a treatment plant. What types of pumps are typically used to lift
influent wastewater?
a) air-lift
b) centrifugal
c) positive displacement
d) progressing cavity
a) detention time
The detention time represents the time required for a unit volume (tank volume) of wastewater to pass
through a tank at a given flow rate. Ans- The time it takes for a unit volume of wastewater to pass
entirely through a primary clarifier is called...
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