Operation of Wastewater Treatment Plants (Levels 1-2) Exam with
all Correct & 100% Verified Answers |Already Graded A+
1. An Imhoff cone is used
D. settleable
to measure solids.
A. suspended (Operation of Wastewater Treatment Plants,
B. colloidal Volume 1 by Kenneth D. Kerri)
C. volatile
D. settleable
2. A flume is widely Parshall
used for measuring
wastewater flow. (Operation of Wastewater Treatment Plants,
Volume 1 by Kenneth D. Kerri)
3. Velocity of flow in a grit chan- .7 to 1.4 fps
nel must be reduced to a
range of to fps (Operation of Wastewater Treatment Plants, Volume 1,
in
3.33
order for grit to properly set- by Kenneth D. Kerri)
tle.
4. With respect to grit bar screens feature bars set at
removal systems, grit to degrees from
is traditional-ly defined vertical.
as particles larg-er
than 0.21mm (0.008 6. Manually cleaned bar screens
in) feature bars set at
(65 mesh) and with a
specific gravity of
greater than
.
5. Mechanically cleaned
, Operation of Wastewater Treatment Plants (Levels 1-2) Exam with
all Correct & 100% Verified Answers |Already Graded A+
specific gravity of grit is 2.65 or greater
(EPA Wastewater Technology Fact Sheet,
Screening and Grit Removal)
Bars set at 0 to 30 degrees from vertical.
(EPA Wastewater Technology Fact Sheet,
Screening and Grit Removal)
Bars set at 30 to 45 degrees from vertical to
facilitate cleaning. Primarily used in older or
smaller treatment facilities, or in bypass
channels.
,Operation of Wastewater Treatment Plants (Levels 1-2) Exam with
all Correct & 100% Verified Answers |Already Graded A+
to degrees from
vertical to facilitate cleaning. (EPA Wastewater Technology Fact Sheet, Screening
and Grit
Removal)
7. The BOD test measures The BOD test measures the amount of oxygen that is
the amount of oxygen consumed while a sample of wastewater is incubated in
that is consumed while a the dark at a temperature of 20 °C for 5 days (± 3
sample of wastewater is hours)
incubated in the dark at
a temperature of (USGS Book 9-A7 (Third Edition) Five-Day Biochemical
Oxygen
°C for days (± Demand)
hours)
8. What do we mean by "scouring velocity".
To-tal Dissolved Solids A minimum velocity of fps
(TDS) in wastewater? provides this scouring or self-
cleaning velocity.
9. What do we mean by To-
tal Suspended Solids
(TSS) in wastewater?
10. The wastewater in a
sew-er line should
move at a speed that
will prevent the
deposition and buildup
of solids in the sewer;
this is called a
, Operation of Wastewater Treatment Plants (Levels 1-2) Exam with
all Correct & 100% Verified Answers |Already Graded A+
All the solids that cannot be filtered out of
the water
(New Mexico Wastewater Systems Operator
Certification Study Manual)
All the solids that can be filtered out
including: settleable solids and non-
settleable solids (colloids)
(New Mexico Wastewater Systems Operator
Certification Study Manual)
The wastewater in a sewer line should
move at a speed that will prevent the
deposition and buildup of solids in the
sewer; this is called a "scouring velocity". A
minimum velocity of 2 fps provides this
scouring or self-cleaning velocity.
(New Mexico Wastewater Systems Operator
Certification Study Manual)
all Correct & 100% Verified Answers |Already Graded A+
1. An Imhoff cone is used
D. settleable
to measure solids.
A. suspended (Operation of Wastewater Treatment Plants,
B. colloidal Volume 1 by Kenneth D. Kerri)
C. volatile
D. settleable
2. A flume is widely Parshall
used for measuring
wastewater flow. (Operation of Wastewater Treatment Plants,
Volume 1 by Kenneth D. Kerri)
3. Velocity of flow in a grit chan- .7 to 1.4 fps
nel must be reduced to a
range of to fps (Operation of Wastewater Treatment Plants, Volume 1,
in
3.33
order for grit to properly set- by Kenneth D. Kerri)
tle.
4. With respect to grit bar screens feature bars set at
removal systems, grit to degrees from
is traditional-ly defined vertical.
as particles larg-er
than 0.21mm (0.008 6. Manually cleaned bar screens
in) feature bars set at
(65 mesh) and with a
specific gravity of
greater than
.
5. Mechanically cleaned
, Operation of Wastewater Treatment Plants (Levels 1-2) Exam with
all Correct & 100% Verified Answers |Already Graded A+
specific gravity of grit is 2.65 or greater
(EPA Wastewater Technology Fact Sheet,
Screening and Grit Removal)
Bars set at 0 to 30 degrees from vertical.
(EPA Wastewater Technology Fact Sheet,
Screening and Grit Removal)
Bars set at 30 to 45 degrees from vertical to
facilitate cleaning. Primarily used in older or
smaller treatment facilities, or in bypass
channels.
,Operation of Wastewater Treatment Plants (Levels 1-2) Exam with
all Correct & 100% Verified Answers |Already Graded A+
to degrees from
vertical to facilitate cleaning. (EPA Wastewater Technology Fact Sheet, Screening
and Grit
Removal)
7. The BOD test measures The BOD test measures the amount of oxygen that is
the amount of oxygen consumed while a sample of wastewater is incubated in
that is consumed while a the dark at a temperature of 20 °C for 5 days (± 3
sample of wastewater is hours)
incubated in the dark at
a temperature of (USGS Book 9-A7 (Third Edition) Five-Day Biochemical
Oxygen
°C for days (± Demand)
hours)
8. What do we mean by "scouring velocity".
To-tal Dissolved Solids A minimum velocity of fps
(TDS) in wastewater? provides this scouring or self-
cleaning velocity.
9. What do we mean by To-
tal Suspended Solids
(TSS) in wastewater?
10. The wastewater in a
sew-er line should
move at a speed that
will prevent the
deposition and buildup
of solids in the sewer;
this is called a
, Operation of Wastewater Treatment Plants (Levels 1-2) Exam with
all Correct & 100% Verified Answers |Already Graded A+
All the solids that cannot be filtered out of
the water
(New Mexico Wastewater Systems Operator
Certification Study Manual)
All the solids that can be filtered out
including: settleable solids and non-
settleable solids (colloids)
(New Mexico Wastewater Systems Operator
Certification Study Manual)
The wastewater in a sewer line should
move at a speed that will prevent the
deposition and buildup of solids in the
sewer; this is called a "scouring velocity". A
minimum velocity of 2 fps provides this
scouring or self-cleaning velocity.
(New Mexico Wastewater Systems Operator
Certification Study Manual)
