Wastewater Operator Class D Exam
Questions With Verified, Correct
Solutions
hydrologic cycle - SOLVED ANSWER-The natural exchange of water between the earth
and the air
Evaporation - SOLVED ANSWER-______________ causes surface water to enter the
atmosphere and begin the Hydrologic Cycle
warmer, increased - SOLVED ANSWER-___________ temperatures will speed up the
aerobic digestion process due to ___________ biological activity
increasing - SOLVED ANSWER-_____________ the belt tension will enable a belt
press to produce cake with a higher solids concentration
slowest - SOLVED ANSWER-The ideal belt speed is the ___________speed that the
belt can be operated at without washing out the belt
secondary, primary, secondary - SOLVED ANSWER-__________sludge is not as easy
to dewater as ________________sludge because ________________sludge has a
higher water content relative to the size of the sludge particle
Drainage zone - SOLVED ANSWER-The purpose of the __________ ____________ at
the beginning of a belt filter press is to allow most of the water combined with the sludge
to drain off
,decrease - SOLVED ANSWER-During the operation cycle of a plate and frame filter
press, the flow through the press will ____________as it reaches the end of its cycle
reducing, increasing, increasing - SOLVED ANSWER-Solids washout from a belt press
can be reduced by _____________ the sludge feed rate, ___________the polymer
dose, or __________ the belt speed
reduce, increase - SOLVED ANSWER-To produce a dryer cake from a belt press, the
operator can adjust the chemical dose, _______the belt speed, or _________belt
tension
2 to 10 - SOLVED ANSWER-The typical belt speed of a belt press ranges from
_______ to ________ feet per minute
slowly - SOLVED ANSWER-If the belt on a belt press is traveling too __________,
solids can build up and cause improper drainage
14% to 18% - SOLVED ANSWER-A belt press that is dewatering secondary sludge
from an extended aeration process can produce a cake ranging from _________% to
________% total solids
Precipitation - SOLVED ANSWER-Rain or snow falling from the clouds
Condensation - SOLVED ANSWER-what causes water vapor to form clouds
Groundwater sources - SOLVED ANSWER-generally better protected from
contamination than surface water sources
,Goal of wastewater systems and wastewater operators - SOLVED ANSWER-to properly
collect, transport, and treat both domestic and industrial wastewater prior to discharge
into the environment
Point-Source - SOLVED ANSWER-Wastewater entering surface water at a specific
point from a specific source
Non-Point-Source - SOLVED ANSWER-Contaminated water that enters surface water
intermittently
The wastewater treatment plant operator's knowledge of the treatment process -
SOLVED ANSWER-A key determining factor whether or not the plant can meet its
discharge permit requirements
Clean Water Act of 1972 - SOLVED ANSWER-The major piece of national legislation
that governs wastewater treatment
The Texas Commission on Environmental Quality (TCEQ) - SOLVED ANSWER-
Controls the wastewater regulations in Texas
Local governments - SOLVED ANSWER-Have the authority to inspect water quality
within their jurisdictional boundaries and ensure wastewater treatment facilities are
meeting their permit requirements
Infiltration - SOLVED ANSWER-Groundwater entering the collection system through
leaking joints, cracks, or holes in system pipes
Inflow - SOLVED ANSWER-The result of surface runoff entering through leaking
manhole covers, or illegal rood, gutter and sump pump connections to the collection
system
, Nutrient Deficient - SOLVED ANSWER-In addition to increased hydraulic loading,
infiltration and inflow can deliver _________ __________ water to the treatment plant
that can upset the biological treatment process
Increased - SOLVED ANSWER-Warmer water temperatures will result in
_________biological activity in a collection system
hydrogen sulfide - SOLVED ANSWER-Increased biological activity increases the
production rate of _________ __________ which is a dangerous byproduct of organic
material decomposition
200 and 600 - SOLVED ANSWER-Normal raw wastewater COD ranges between
________ and ______mg/L
COD is typically higher than BOD - SOLVED ANSWER-_________ is typically higher
than _____ with the typical relationship between BOD and COD 0.5:1 (BOD:COD) for
raw wastewater
inverse - SOLVED ANSWER-There is an ________ relationship between water
temperature and its ability to maintain dissolved oxygen in solution
colder - SOLVED ANSWER-As water gets _________, it is capable of holding more
dissolved oxygen
warmer - SOLVED ANSWER-As water gets ________, its ability to hold dissolved
oxygen in solution goes down
nitrification inhibitor - SOLVED ANSWER-When performing the CBOD test on biological
process effluent water, a ____________ __________ must be added to that only
carbonaceous BOD is measured
Questions With Verified, Correct
Solutions
hydrologic cycle - SOLVED ANSWER-The natural exchange of water between the earth
and the air
Evaporation - SOLVED ANSWER-______________ causes surface water to enter the
atmosphere and begin the Hydrologic Cycle
warmer, increased - SOLVED ANSWER-___________ temperatures will speed up the
aerobic digestion process due to ___________ biological activity
increasing - SOLVED ANSWER-_____________ the belt tension will enable a belt
press to produce cake with a higher solids concentration
slowest - SOLVED ANSWER-The ideal belt speed is the ___________speed that the
belt can be operated at without washing out the belt
secondary, primary, secondary - SOLVED ANSWER-__________sludge is not as easy
to dewater as ________________sludge because ________________sludge has a
higher water content relative to the size of the sludge particle
Drainage zone - SOLVED ANSWER-The purpose of the __________ ____________ at
the beginning of a belt filter press is to allow most of the water combined with the sludge
to drain off
,decrease - SOLVED ANSWER-During the operation cycle of a plate and frame filter
press, the flow through the press will ____________as it reaches the end of its cycle
reducing, increasing, increasing - SOLVED ANSWER-Solids washout from a belt press
can be reduced by _____________ the sludge feed rate, ___________the polymer
dose, or __________ the belt speed
reduce, increase - SOLVED ANSWER-To produce a dryer cake from a belt press, the
operator can adjust the chemical dose, _______the belt speed, or _________belt
tension
2 to 10 - SOLVED ANSWER-The typical belt speed of a belt press ranges from
_______ to ________ feet per minute
slowly - SOLVED ANSWER-If the belt on a belt press is traveling too __________,
solids can build up and cause improper drainage
14% to 18% - SOLVED ANSWER-A belt press that is dewatering secondary sludge
from an extended aeration process can produce a cake ranging from _________% to
________% total solids
Precipitation - SOLVED ANSWER-Rain or snow falling from the clouds
Condensation - SOLVED ANSWER-what causes water vapor to form clouds
Groundwater sources - SOLVED ANSWER-generally better protected from
contamination than surface water sources
,Goal of wastewater systems and wastewater operators - SOLVED ANSWER-to properly
collect, transport, and treat both domestic and industrial wastewater prior to discharge
into the environment
Point-Source - SOLVED ANSWER-Wastewater entering surface water at a specific
point from a specific source
Non-Point-Source - SOLVED ANSWER-Contaminated water that enters surface water
intermittently
The wastewater treatment plant operator's knowledge of the treatment process -
SOLVED ANSWER-A key determining factor whether or not the plant can meet its
discharge permit requirements
Clean Water Act of 1972 - SOLVED ANSWER-The major piece of national legislation
that governs wastewater treatment
The Texas Commission on Environmental Quality (TCEQ) - SOLVED ANSWER-
Controls the wastewater regulations in Texas
Local governments - SOLVED ANSWER-Have the authority to inspect water quality
within their jurisdictional boundaries and ensure wastewater treatment facilities are
meeting their permit requirements
Infiltration - SOLVED ANSWER-Groundwater entering the collection system through
leaking joints, cracks, or holes in system pipes
Inflow - SOLVED ANSWER-The result of surface runoff entering through leaking
manhole covers, or illegal rood, gutter and sump pump connections to the collection
system
, Nutrient Deficient - SOLVED ANSWER-In addition to increased hydraulic loading,
infiltration and inflow can deliver _________ __________ water to the treatment plant
that can upset the biological treatment process
Increased - SOLVED ANSWER-Warmer water temperatures will result in
_________biological activity in a collection system
hydrogen sulfide - SOLVED ANSWER-Increased biological activity increases the
production rate of _________ __________ which is a dangerous byproduct of organic
material decomposition
200 and 600 - SOLVED ANSWER-Normal raw wastewater COD ranges between
________ and ______mg/L
COD is typically higher than BOD - SOLVED ANSWER-_________ is typically higher
than _____ with the typical relationship between BOD and COD 0.5:1 (BOD:COD) for
raw wastewater
inverse - SOLVED ANSWER-There is an ________ relationship between water
temperature and its ability to maintain dissolved oxygen in solution
colder - SOLVED ANSWER-As water gets _________, it is capable of holding more
dissolved oxygen
warmer - SOLVED ANSWER-As water gets ________, its ability to hold dissolved
oxygen in solution goes down
nitrification inhibitor - SOLVED ANSWER-When performing the CBOD test on biological
process effluent water, a ____________ __________ must be added to that only
carbonaceous BOD is measured
