TEXAS WASTEWATER D EVALUATION EXAM QUESTIONS
AND SOLUTIONS RATED A+
✔✔Nutrient inhibition of algae - ✔✔The growth of desirable algae can be inhibited if
sufficient nutrients are not in the wastewater.
✔✔Pond recirculation line - ✔✔The pond recirculation line is used to return effluent rich
in algae and oxygen for seeding, dilution, and process control.
✔✔Pond outlet baffle - ✔✔The pond outlet baffle prevents surface debris from leaving
the pond.
✔✔Methane fermentation process - ✔✔The methane fermentation process removes the
majority of the organic load in a waste treatment pond.
✔✔Sodium nitrate in ponds - ✔✔Sodium nitrate can be added to a waste treatment
pond to provide a source of chemically bound oxygen to help control odors.
✔✔No discharge pond system - ✔✔A pond system where percolation rates and
evaporation rates must be considered.
✔✔Surface scum - ✔✔A layer on a treatment pond that can reduce oxygen production
from algae and lead to foul odors.
✔✔Surface aerators - ✔✔Devices that may be necessary in waste treatment ponds
during the night, cold months, or during periods of organic overload.
✔✔Aerobic bacteria - ✔✔Bacteria that live in environments containing oxygen, which is
required for their survival.
✔✔Anaerobic bacteria - ✔✔Bacteria that thrive in environments that have no dissolved
oxygen.
✔✔Waste stabilization pond - ✔✔Another name for a wastewater treatment pond used
to treat raw wastewater.
✔✔Facultative wastewater treatment pond - ✔✔A pond with an aerobic upper layer and
an anaerobic lower layer.
✔✔Oxidation Ponds - ✔✔Treatment ponds operated in series following Primary
Treatment.
✔✔Facultative pond - ✔✔The most common type of waste treatment pond.
, ✔✔Controlling mosquitoes - ✔✔Can be accomplished by disturbing the water surface in
a pond.
✔✔Dissolved oxygen - ✔✔Lowest in a wastewater treatment pond at sunrise.
✔✔Air Gap - ✔✔An open vertical drop that separates a drinking water supply from
another water system to prevent contamination.
✔✔Amperometric Titration - ✔✔A means of measuring concentrations of certain
substances in water based on the electric current during a chemical reaction.
✔✔Bacteria - ✔✔Living organisms, microscopic in size, usually consisting of a single
cell that use organic matter for food.
✔✔Breakpoint Chlorination - ✔✔Addition of chlorine to water until the chlorine demand
is satisfied, resulting in a free chlorine residual proportional to the amount added
beyond the breakpoint.
✔✔Chloramines - ✔✔Compounds formed by the reaction of hypochlorous acid with
ammonia.
✔✔Chlorine Demand - ✔✔The difference between the amount of chlorine added to
water and the amount of residual chlorine remaining after a given contact time.
✔✔Chlorine Residual - ✔✔The concentration of chlorine present in water after the
chlorine demand has been satisfied, expressed in total chlorine residual.
✔✔Chloroorganic - ✔✔Organic compounds combined with chlorine, generally
originating from life processes such as those of algae in water.
✔✔Coliform - ✔✔A group of bacteria found in the intestines of warm-blooded animals,
indicating water pollution and potential pathogenic organisms.
✔✔Combined Chlorine - ✔✔The sum of chlorine species composed of free chlorine and
ammonia, including monochloramine, dichloramine, and trichloramine.
✔✔Disinfection - ✔✔The process designed to kill or inactivate most microorganisms in
water, with chlorination being the most frequently used method.
✔✔Ejector - ✔✔A device used to disperse a chemical solution into water being treated.
✔✔Free Available Residual Chlorine - ✔✔That portion of the total available residual
chlorine composed of dissolved chlorine gas (CI2), hypochlorous acid (HOCI), and/or
hypochlorite ion (OCI-) remaining in water after chlorination.
AND SOLUTIONS RATED A+
✔✔Nutrient inhibition of algae - ✔✔The growth of desirable algae can be inhibited if
sufficient nutrients are not in the wastewater.
✔✔Pond recirculation line - ✔✔The pond recirculation line is used to return effluent rich
in algae and oxygen for seeding, dilution, and process control.
✔✔Pond outlet baffle - ✔✔The pond outlet baffle prevents surface debris from leaving
the pond.
✔✔Methane fermentation process - ✔✔The methane fermentation process removes the
majority of the organic load in a waste treatment pond.
✔✔Sodium nitrate in ponds - ✔✔Sodium nitrate can be added to a waste treatment
pond to provide a source of chemically bound oxygen to help control odors.
✔✔No discharge pond system - ✔✔A pond system where percolation rates and
evaporation rates must be considered.
✔✔Surface scum - ✔✔A layer on a treatment pond that can reduce oxygen production
from algae and lead to foul odors.
✔✔Surface aerators - ✔✔Devices that may be necessary in waste treatment ponds
during the night, cold months, or during periods of organic overload.
✔✔Aerobic bacteria - ✔✔Bacteria that live in environments containing oxygen, which is
required for their survival.
✔✔Anaerobic bacteria - ✔✔Bacteria that thrive in environments that have no dissolved
oxygen.
✔✔Waste stabilization pond - ✔✔Another name for a wastewater treatment pond used
to treat raw wastewater.
✔✔Facultative wastewater treatment pond - ✔✔A pond with an aerobic upper layer and
an anaerobic lower layer.
✔✔Oxidation Ponds - ✔✔Treatment ponds operated in series following Primary
Treatment.
✔✔Facultative pond - ✔✔The most common type of waste treatment pond.
, ✔✔Controlling mosquitoes - ✔✔Can be accomplished by disturbing the water surface in
a pond.
✔✔Dissolved oxygen - ✔✔Lowest in a wastewater treatment pond at sunrise.
✔✔Air Gap - ✔✔An open vertical drop that separates a drinking water supply from
another water system to prevent contamination.
✔✔Amperometric Titration - ✔✔A means of measuring concentrations of certain
substances in water based on the electric current during a chemical reaction.
✔✔Bacteria - ✔✔Living organisms, microscopic in size, usually consisting of a single
cell that use organic matter for food.
✔✔Breakpoint Chlorination - ✔✔Addition of chlorine to water until the chlorine demand
is satisfied, resulting in a free chlorine residual proportional to the amount added
beyond the breakpoint.
✔✔Chloramines - ✔✔Compounds formed by the reaction of hypochlorous acid with
ammonia.
✔✔Chlorine Demand - ✔✔The difference between the amount of chlorine added to
water and the amount of residual chlorine remaining after a given contact time.
✔✔Chlorine Residual - ✔✔The concentration of chlorine present in water after the
chlorine demand has been satisfied, expressed in total chlorine residual.
✔✔Chloroorganic - ✔✔Organic compounds combined with chlorine, generally
originating from life processes such as those of algae in water.
✔✔Coliform - ✔✔A group of bacteria found in the intestines of warm-blooded animals,
indicating water pollution and potential pathogenic organisms.
✔✔Combined Chlorine - ✔✔The sum of chlorine species composed of free chlorine and
ammonia, including monochloramine, dichloramine, and trichloramine.
✔✔Disinfection - ✔✔The process designed to kill or inactivate most microorganisms in
water, with chlorination being the most frequently used method.
✔✔Ejector - ✔✔A device used to disperse a chemical solution into water being treated.
✔✔Free Available Residual Chlorine - ✔✔That portion of the total available residual
chlorine composed of dissolved chlorine gas (CI2), hypochlorous acid (HOCI), and/or
hypochlorite ion (OCI-) remaining in water after chlorination.
