TCEQ Class B Surface Water B Test
Material / TCEQ Class B Water
License Exam Already Passed!!
•
What is the most important factor affecting the useful life of service lines? -
✔✔✔ANSWER-It is the ability of the material to resist internal and external
corrosion
When does Suction Head exist? - ✔✔✔ANSWER-Suction head exists when
the source of supply is above the centerline of the pump.
,What is Net positive Suction Head (NPSH) - ✔✔✔ANSWER-NPSH is the
pressure under which water enters the eye of the impeller in a centrifugal pump.
Insufficient NPSH is the main cause of pump cavitation
Explain and expand on Chlorine Dioxide (what it reacts with, oxidizes, etc) -
✔✔✔ANSWER-Chlorine Dioxide is a gas used in small quantities to disinfect
water. It does not react with organics to form THMs and HAAs. It oxidizes
phenols, manganese, iron, sulfurous and organic compounds which aids in the
removal of tastes and odors. It is a very effective bactericide and a superior
virocide. It dies not combine with ammonia. Chlorine Dioxide MRDL is .8 mg/L
and monitoring procedures are the same as for chlorine. The Chlorite MCL is .q
mg/L and must be monitored daily.
What is texas drinking water pH requirements? - ✔✔✔ANSWER-The texas
drinking water requirements require a pH > 7.0 for the water treatment plant
finished water. EPA requires that pH analysis be preformed within 15 minutes of
the sample being caught.
How does pH affect Chlorine activity? - ✔✔✔ANSWER-When chlorine is
added to water it forms hypochlorous acid (HOCL) and hydrochloric acid (OCL).
The hypochlorous acid is the effective disinfectant. At a pH of 4.0 there is 100%
hypochlorous acid. At a pH of 11 there is 100% hypochlorite ion. At a pH of 7, the
hypochlorous acid is at about 80% and the hypochlorite ion makes up about 20%
of the chlorine content. The lower the pH is more effective chlorine is because you
have more hypochlorous acid.
,What is meant by water stability? - ✔✔✔ANSWER-Stable water is defined as
water that will neither deposit or dissolve a calcium carbonate film or scale. Since
no water is stable indefinitely, chemical treatment of water usually is intended to
produce water that is slightly scale forming without being liable to cause stoppages
in small lines and services. Bayliss curve is the simplest determination of stability.
The Langelier saturation index is also used.
What/how are above ground tanks and piping protected from corrosion? -
✔✔✔ANSWER-Corrosion protection for above ground tanks and piping is
prevented by: cathodic protection, use if protective linings/coatings, eliminating
different types of metals in the distribution system, and treating the water with
chemicals to make it less corrosive
How do you tests fir alkalinity? - ✔✔✔ANSWER-The two tritiation methods
of analysis are a standard acid to titrate a sample. The end point of the titration is
determined by the following: an indicator that changes color at a certain pH, or
potentiometric titration to end - point pH. Using either of the methods, a measured
amount of sample is titrated with a standard sulfuric acid to a predetermined pH.
Nomograph are a graphical form of determining alkalinity. If the pH, total
alkalinity, temperature and total dissolved solids are known, any or all of the
alkalinity forms may be estimated.
What is Turbidity? - ✔✔✔ANSWER-Turbidity can be described as a measure
of the relative clarity of water. Turbidity is an expression of the optical property
that causes light to be scattered and absorbed rather than transmitted in straight
lines through the sample.
, What causes Turbidity? - ✔✔✔ANSWER-Turbidity is caused by clay, slit,
finely divided organic and inorganic material. Other suspended matter and
microscopic organisms can also cause turbidity. There is one approved method for
running turbidity - the Nephelometric Method (NTU)
What is chlorine Demand? - ✔✔✔ANSWER-The amount of chlorine used up
to completely react with the water and its suspended or dissolve material
What is chlorine residual? - ✔✔✔ANSWER-When all the demand of the water
is met any additional chlorine produces a chlorine residual
What is chlorine dosage? - ✔✔✔ANSWER-Demand plus residual is the
chlorine dosage. Chlorine Dosage = Demand + Residual
What determines rate of disinfection? - ✔✔✔ANSWER-Chlorine
concentration and contact time determines the rate and degree of disinfection. If
concentration increases, the time can be reduced; if concentration is reduced the
time must be increased.
How does temperature effect chlorine effectiveness? - ✔✔✔ANSWER-
Chlorine effectiveness is greater at higher temperatures, up to the point that
chlorine volatizes. At low temperature, chlorine is more stable, but disinfection
time increases.
Material / TCEQ Class B Water
License Exam Already Passed!!
•
What is the most important factor affecting the useful life of service lines? -
✔✔✔ANSWER-It is the ability of the material to resist internal and external
corrosion
When does Suction Head exist? - ✔✔✔ANSWER-Suction head exists when
the source of supply is above the centerline of the pump.
,What is Net positive Suction Head (NPSH) - ✔✔✔ANSWER-NPSH is the
pressure under which water enters the eye of the impeller in a centrifugal pump.
Insufficient NPSH is the main cause of pump cavitation
Explain and expand on Chlorine Dioxide (what it reacts with, oxidizes, etc) -
✔✔✔ANSWER-Chlorine Dioxide is a gas used in small quantities to disinfect
water. It does not react with organics to form THMs and HAAs. It oxidizes
phenols, manganese, iron, sulfurous and organic compounds which aids in the
removal of tastes and odors. It is a very effective bactericide and a superior
virocide. It dies not combine with ammonia. Chlorine Dioxide MRDL is .8 mg/L
and monitoring procedures are the same as for chlorine. The Chlorite MCL is .q
mg/L and must be monitored daily.
What is texas drinking water pH requirements? - ✔✔✔ANSWER-The texas
drinking water requirements require a pH > 7.0 for the water treatment plant
finished water. EPA requires that pH analysis be preformed within 15 minutes of
the sample being caught.
How does pH affect Chlorine activity? - ✔✔✔ANSWER-When chlorine is
added to water it forms hypochlorous acid (HOCL) and hydrochloric acid (OCL).
The hypochlorous acid is the effective disinfectant. At a pH of 4.0 there is 100%
hypochlorous acid. At a pH of 11 there is 100% hypochlorite ion. At a pH of 7, the
hypochlorous acid is at about 80% and the hypochlorite ion makes up about 20%
of the chlorine content. The lower the pH is more effective chlorine is because you
have more hypochlorous acid.
,What is meant by water stability? - ✔✔✔ANSWER-Stable water is defined as
water that will neither deposit or dissolve a calcium carbonate film or scale. Since
no water is stable indefinitely, chemical treatment of water usually is intended to
produce water that is slightly scale forming without being liable to cause stoppages
in small lines and services. Bayliss curve is the simplest determination of stability.
The Langelier saturation index is also used.
What/how are above ground tanks and piping protected from corrosion? -
✔✔✔ANSWER-Corrosion protection for above ground tanks and piping is
prevented by: cathodic protection, use if protective linings/coatings, eliminating
different types of metals in the distribution system, and treating the water with
chemicals to make it less corrosive
How do you tests fir alkalinity? - ✔✔✔ANSWER-The two tritiation methods
of analysis are a standard acid to titrate a sample. The end point of the titration is
determined by the following: an indicator that changes color at a certain pH, or
potentiometric titration to end - point pH. Using either of the methods, a measured
amount of sample is titrated with a standard sulfuric acid to a predetermined pH.
Nomograph are a graphical form of determining alkalinity. If the pH, total
alkalinity, temperature and total dissolved solids are known, any or all of the
alkalinity forms may be estimated.
What is Turbidity? - ✔✔✔ANSWER-Turbidity can be described as a measure
of the relative clarity of water. Turbidity is an expression of the optical property
that causes light to be scattered and absorbed rather than transmitted in straight
lines through the sample.
, What causes Turbidity? - ✔✔✔ANSWER-Turbidity is caused by clay, slit,
finely divided organic and inorganic material. Other suspended matter and
microscopic organisms can also cause turbidity. There is one approved method for
running turbidity - the Nephelometric Method (NTU)
What is chlorine Demand? - ✔✔✔ANSWER-The amount of chlorine used up
to completely react with the water and its suspended or dissolve material
What is chlorine residual? - ✔✔✔ANSWER-When all the demand of the water
is met any additional chlorine produces a chlorine residual
What is chlorine dosage? - ✔✔✔ANSWER-Demand plus residual is the
chlorine dosage. Chlorine Dosage = Demand + Residual
What determines rate of disinfection? - ✔✔✔ANSWER-Chlorine
concentration and contact time determines the rate and degree of disinfection. If
concentration increases, the time can be reduced; if concentration is reduced the
time must be increased.
How does temperature effect chlorine effectiveness? - ✔✔✔ANSWER-
Chlorine effectiveness is greater at higher temperatures, up to the point that
chlorine volatizes. At low temperature, chlorine is more stable, but disinfection
time increases.
