Wastewater Class B Texas Exam
Questions With Complete Solutions
Scored A+
These can be used to dewater sludge - CORRECT ANSWER-belt press, drying beds,
solid bowl centrifuge, gravity thickener
Most important to providing adequate sewage treatment in a stabilization pond -
CORRECT ANSWER-sunlight, algae, bacteria and time
Offensive and objectionable odors which sometimes occur in trickling filters usually
indicate - CORRECT ANSWER-septic conditions are present
Dissolved Oxygen (DO) in aeration tank of an activated sludge plant should be
maintained at or about - CORRECT ANSWER-2 to 4 mg/L
Contributes to the infiltration in a collection system - CORRECT ANSWER-breaks in the
main lines, high ground water levels, heavy rains, hydro jet cleaning plugged mains
When a centrifuge pump loses prime the - CORRECT ANSWER-pump is no longer
moving liquid
A Rotating Biological Contactor (RBC) is - CORRECT ANSWER-fixed firm biological
treatment process
Needs to be checked regularly to properly operate an activated sludge treatment plant -
CORRECT ANSWER-aeration equipment and mixed liquor solids
,Point source discharges are - CORRECT ANSWER-discharges that come from pipes or
ditches that are monitored, controlled and inspected
Non-point discharges are - CORRECT ANSWER-discharges that have intermittent,
dispersed flows having little or no control
The Texas Water Code establishes the protection of water quality and quantity of the
state by - CORRECT ANSWER-setting stream standards, issues permits for
discharges, identifies non-point source controls, and establishes water reuse.
The wastewater plant operator is primarily responsible for - CORRECT ANSWER-
treating wastewater discharged into the community
Chapter ___ of the Texas Water Code is the state law controlling water pollution and
___ authority to control discharges in Texas - CORRECT ANSWER-Chapter 26 and
Texas Commission of Environmental Quality
The Texas Commission on Environmental Quality can revoke an operator's license if
the operator - CORRECT ANSWER-causes permit violation, falsifies records or
neglects their duty
If accidental discharge, bypass, or spill (SSO) of wastewater occurs the responsible
party MUST notify TCEQ regional offices within ____ hours - CORRECT ANSWER-24
Aerobic Bacteria require_____ in the water for their metabolism - CORRECT ANSWER-
oxygen
Anaerobic Bacteria _____ live with O2 present in the water for their metabolism -
CORRECT ANSWER-cannot
, Facultative Bacteria require__________in the water for their metabolism - CORRECT
ANSWER-either aerobic or anaerobic conditions
Chemical characteristics of sewage include - CORRECT ANSWER-solids, greases,
dissolved oxygen, O2 Demand, pH, and gasses
_________removes Total Suspended Solids (TSS) - CORRECT ANSWER-filtration
Inorganic solids include - CORRECT ANSWER-sand, grit and minerals
Organic solids include - CORRECT ANSWER-organic materials from plants, animals or
humans
A good plant influent pH is about - CORRECT ANSWER-7.2
Dangerous gases are produced during bacterial decomposition of organics in
wastewater. The main gasses are - CORRECT ANSWER-Hydrogen sulfide, carbon
dioxide and methane
The majority of Dissolved Oxygen in raw sewage comes from - CORRECT ANSWER-
Potable Drinking Water
Each person contributes approximately ______ lbs of BOD to the system daily. -
CORRECT ANSWER-0.17
Sources of waste water include - CORRECT ANSWER-domestic, storm water,
commercial, food processing, agricultural and industrial
Questions With Complete Solutions
Scored A+
These can be used to dewater sludge - CORRECT ANSWER-belt press, drying beds,
solid bowl centrifuge, gravity thickener
Most important to providing adequate sewage treatment in a stabilization pond -
CORRECT ANSWER-sunlight, algae, bacteria and time
Offensive and objectionable odors which sometimes occur in trickling filters usually
indicate - CORRECT ANSWER-septic conditions are present
Dissolved Oxygen (DO) in aeration tank of an activated sludge plant should be
maintained at or about - CORRECT ANSWER-2 to 4 mg/L
Contributes to the infiltration in a collection system - CORRECT ANSWER-breaks in the
main lines, high ground water levels, heavy rains, hydro jet cleaning plugged mains
When a centrifuge pump loses prime the - CORRECT ANSWER-pump is no longer
moving liquid
A Rotating Biological Contactor (RBC) is - CORRECT ANSWER-fixed firm biological
treatment process
Needs to be checked regularly to properly operate an activated sludge treatment plant -
CORRECT ANSWER-aeration equipment and mixed liquor solids
,Point source discharges are - CORRECT ANSWER-discharges that come from pipes or
ditches that are monitored, controlled and inspected
Non-point discharges are - CORRECT ANSWER-discharges that have intermittent,
dispersed flows having little or no control
The Texas Water Code establishes the protection of water quality and quantity of the
state by - CORRECT ANSWER-setting stream standards, issues permits for
discharges, identifies non-point source controls, and establishes water reuse.
The wastewater plant operator is primarily responsible for - CORRECT ANSWER-
treating wastewater discharged into the community
Chapter ___ of the Texas Water Code is the state law controlling water pollution and
___ authority to control discharges in Texas - CORRECT ANSWER-Chapter 26 and
Texas Commission of Environmental Quality
The Texas Commission on Environmental Quality can revoke an operator's license if
the operator - CORRECT ANSWER-causes permit violation, falsifies records or
neglects their duty
If accidental discharge, bypass, or spill (SSO) of wastewater occurs the responsible
party MUST notify TCEQ regional offices within ____ hours - CORRECT ANSWER-24
Aerobic Bacteria require_____ in the water for their metabolism - CORRECT ANSWER-
oxygen
Anaerobic Bacteria _____ live with O2 present in the water for their metabolism -
CORRECT ANSWER-cannot
, Facultative Bacteria require__________in the water for their metabolism - CORRECT
ANSWER-either aerobic or anaerobic conditions
Chemical characteristics of sewage include - CORRECT ANSWER-solids, greases,
dissolved oxygen, O2 Demand, pH, and gasses
_________removes Total Suspended Solids (TSS) - CORRECT ANSWER-filtration
Inorganic solids include - CORRECT ANSWER-sand, grit and minerals
Organic solids include - CORRECT ANSWER-organic materials from plants, animals or
humans
A good plant influent pH is about - CORRECT ANSWER-7.2
Dangerous gases are produced during bacterial decomposition of organics in
wastewater. The main gasses are - CORRECT ANSWER-Hydrogen sulfide, carbon
dioxide and methane
The majority of Dissolved Oxygen in raw sewage comes from - CORRECT ANSWER-
Potable Drinking Water
Each person contributes approximately ______ lbs of BOD to the system daily. -
CORRECT ANSWER-0.17
Sources of waste water include - CORRECT ANSWER-domestic, storm water,
commercial, food processing, agricultural and industrial
