Wastewater Treatment Quiz

Questions and Answers

Domestic wastewater is also called ______ wastewater

sanitary

The water that enters the sewer system through leaking joints, cracks, and breaks is called ______

infiltration

Inflow is storm water that enters the sewer system from storm drain connections, roof leaders, and foundation and basement drain, or through ______ covers

manhole

Runoff resulting from rainfall and snowmelt is called ______ water

storm Signup and view all the answers

Over-aeration, resulting in DO levels of 5-6, can lead to undesirable microorganisms and filamentous bulking in the sludge.

aerobic processes Signup and view all the answers

Operational causes of non-filamentous organisms include over-aeration and the presence of toxic substances.

filamentous bulking Signup and view all the answers

Aeration techniques include the use of air diffusers and ______, each with its unique advantages and limitations.

mechanical aerators Signup and view all the answers

Wastewater ponds and lagoons are used for natural purification processes, with aerobic ponds often referred to as polishing or tertiary ponds.

attached growth systems Signup and view all the answers

The success of an ______ is often dependent on the performance of the final clarifier.

activated sludge system Signup and view all the answers

Trickling filters utilize randomly packed solid medium and are simple with low operating costs but may have odor and clogging problems.

trickling filters Signup and view all the answers

The presence of oxygen in is primarily provided by photosynthesis, and lagoons are distinguished from by artificial aeration to provide oxygen.

ponds Signup and view all the answers

Various cures and techniques can be employed to address issues such as adjusting F/M ratio and DO levels, ______, and pre-treating wastewater.

dosing with H2O2 Signup and view all the answers

Attached growth systems, such as trickling filters and ______, are populated by a variety of organisms and are effective in treating wastewater.

biotowers Signup and view all the answers

Filamentous bulking in ______ can be caused by operational and wastewater characteristic factors.

secondary clarifiers Signup and view all the answers

Biotowers use ______ in a vertical arrangement and are suitable for higher porosity and low weight.

synthetic media Signup and view all the answers

Dissolved oxygen (DO) levels are crucial for the aerobic processes, with the ______ being 1.5 – 2.5 mg/L.

optimum range Signup and view all the answers

Biological wastewater treatment involves the use of microorganisms to convert organics in wastewater into ______ or biomass.

biological cells Signup and view all the answers

In biological treatment, the rate of biomass production and food utilization is affected by factors such as temperature, pH, toxins, salt concentration, oxidants, and ______.

nutrient deficiency Signup and view all the answers

Microorganisms in biological treatment may be irreparably damaged by sudden changes in environmental factors, requiring a gradual adjustment to a wide range of ______.

factors Signup and view all the answers

The design of biological systems for wastewater treatment requires knowledge of biological principles, kinetics of metabolism, mass balance principles, and ______ operations.

physical Signup and view all the answers

Two types of biological growth/culture used in wastewater treatment are suspended cultures/growth and attached ______.

growth Signup and view all the answers

Design parameters/operational parameters in the activated sludge process include F/M ratio, MLSS, MCRT/SRT, and ______, which affect treatment efficiency and waste activated sludge production.

HRT Signup and view all the answers

F/M ratio measures organic loading and affects aeration period and treatment efficiency, with low ratios resulting in high treatment efficiency and little waste activated ______.

sludge Signup and view all the answers

MLSS represents the suspended solids in the reactor and is useful in the determination of F/M, sometimes expressed in terms of suspended ______.

solids Signup and view all the answers

MCRT/SRT represents the average time in which microorganisms or solids stay in the reactor, and HRT represents the average time in which the liquid remains in the ______.

system Signup and view all the answers

Wastewater contains a wide variety of organics and requires a wide variety of organisms or a mixed culture for complete ______.

treatment Signup and view all the answers

The microorganisms involved in biological treatment are the same as those in natural freshwater systems but are carefully controlled in engineered reactors to optimize organic ______.

removal Signup and view all the answers

Suspended cultures/growth in wastewater treatment include activated sludge, ponds, and lagoons, with variations such as step aeration, tapered aeration, contact stabilization, pure oxygen activated sludge, oxidation ditch, high rate, and extended ______.

aeration Signup and view all the answers

Fine ______ consist of woven wire or cloth perforated plates and should be mechanically cleaned on a continuous basis.

screens Signup and view all the answers

Mechanically-cleaned bar have bar racks 3 to 4 inches apart, while manually-cleaned bar require good flow distribution and velocity control.

screens Signup and view all the answers

Disposal methods for ______ include hauling to disposal areas, burial on the plant site, incineration, disposal with municipal solid wastes, and grinding and returning to the wastewater flow.

screenings Signup and view all the answers

Comminution involves shredding ______ to approximately 8 mm in size using devices like a hammermill or a barminutor.

screenings Signup and view all the answers

Grit ______ is essential to separate non-biodegradable solids from organic suspended solids, and it includes channel-type horizontal-flow grit chambers, aerated grit chambers, and vortex-type grit chambers.

removal Signup and view all the answers

Grit ______ protect mechanical equipment, reduce heavy deposits, and minimize the frequency of digester cleaning.

chambers Signup and view all the answers

Parshall and Palmer-Bowlus are commonly used for flow measurement in wastewater treatment.

flumes Signup and view all the answers

Primary ______ involves sedimentation, which separates suspended particles from water through gravitational settling in sedimentation basins or tanks.

treatment Signup and view all the answers

Factors affecting ______ tank efficiency include the type of solids, age of wastewater, rate of solids flow, cleanliness, and mechanical condition of the tank.

sedimentation Signup and view all the answers

Sedimentation achieves removal efficiency for settleable solids (90-95%), suspended solids (50-65%), BOD (20-35%), and colloidal solids (not removed unless coagulants are added).

sedimentation Signup and view all the answers

Flow distribution in sedimentation ______ is managed by inlet structures to evenly distribute the flow and prevent short circuiting.

tanks Signup and view all the answers

Secondary ______ involves the biological conversion of dissolved and colloidal organics into biomass, which can be subsequently removed by sedimentation.

treatment Signup and view all the answers

Types of sewer systems: sanitary sewer system, storm sewer system, and collection water system.

combined Signup and view all the answers

Contaminants of concern in wastewater treatment include suspended solids, biodegradable organics, pathogens, nutrients, priority pollutants, refractory organics, heavy metals, and dissolved oxygen.

inorganics Signup and view all the answers

The treatment objectives for wastewater treatment are the removal of suspended and floatable material, treatment of biodegradable organics, elimination of pathogenic organisms, removal of toxic compounds, and removal of nitrogen.

nutrients Signup and view all the answers

Wastewater treatment systems are divided into preliminary, primary, secondary, tertiary, and solids treatment and ______.

disposal Signup and view all the answers

Preliminary wastewater treatment involves the removal of large solids to prevent damage to the remainder of the unit operations through screening, comminution, grit removal, and ______.

flotation Signup and view all the answers

Primary wastewater treatment aims to remove a portion of suspended solids and organic matter by settling or sedimentation, typically removing about 60% of solids and 30% of ______.

BOD Signup and view all the answers

Secondary wastewater treatment is directed principally at the removal of biodegradable organics and suspended solids, including biological treatment by activated sludge, fixed-film reactors, lagoons, and ______ systems.

pond Signup and view all the answers

Tertiary wastewater treatment involves the polishing of secondary effluent, primarily removing nutrients, toxic compounds, increased amounts of organic material, and suspended ______.

solids Signup and view all the answers

Solids treatment and disposal includes the collection, stabilization, and subsequent disposal of the solids removed by other ______.

processes Signup and view all the answers

Wastewater treatment methods are classified into physical unit operations, chemical unit processes, and ______ unit processes.

biological Signup and view all the answers

Preliminary includes screening, the first operation performed on incoming wastewater for the purpose of removing materials that might damage equipment or hinder further .

treatment Signup and view all the answers

Screening devices are used to remove coarse solids from wastewater, which consist of sticks, rags, boards, and other large objects that find their way to the wastewater collection ______

systems Signup and view all the answers

Study Notes

Wastewater Treatment Systems and Contaminants: Key Points

There are three types of sewer systems: sanitary sewer system, storm sewer system, and combined water system.
Contaminants of concern in wastewater treatment include suspended solids, biodegradable organics, pathogens, nutrients, priority pollutants, refractory organics, heavy metals, and dissolved inorganics.
The treatment objectives for wastewater treatment are the removal of suspended and floatable material, treatment of biodegradable organics, elimination of pathogenic organisms, removal of toxic compounds, and removal of nutrients.
Wastewater treatment systems are divided into preliminary, primary, secondary, tertiary, and solids treatment and disposal.
Preliminary wastewater treatment involves the removal of large solids to prevent damage to the remainder of the unit operations through screening, comminution, grit removal, and flotation.
Primary wastewater treatment aims to remove a portion of suspended solids and organic matter by settling or sedimentation, typically removing about 60% of solids and 30% of BOD.
Secondary wastewater treatment is directed principally at the removal of biodegradable organics and suspended solids, including biological treatment by activated sludge, fixed-film reactors, lagoons, and pond systems.
Tertiary wastewater treatment involves the polishing of secondary effluent, primarily removing nutrients, toxic compounds, increased amounts of organic material, and suspended solids.
Solids treatment and disposal includes the collection, stabilization, and subsequent disposal of the solids removed by other processes.
Wastewater treatment methods are classified into physical unit operations, chemical unit processes, and biological unit processes.
Preliminary treatment includes screening, the first operation performed on incoming wastewater for the purpose of removing materials that might damage equipment or hinder further treatment.
Screening devices are used to remove coarse solids from wastewater, which consist of sticks, rags, boards, and other large objects that find their way to the wastewater collection systems.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Description

Test your knowledge of wastewater treatment systems and contaminants with this informative quiz. Explore key points about sewer systems, contaminants of concern, treatment objectives, treatment system divisions, and various treatment methods. See how much you know about the crucial processes involved in wastewater treatment.

Wastewater Treatment Quiz

Questions and Answers

Domestic wastewater is also called ______ wastewater

The water that enters the sewer system through leaking joints, cracks, and breaks is called ______

Inflow is storm water that enters the sewer system from storm drain connections, roof leaders, and foundation and basement drain, or through ______ covers

Runoff resulting from rainfall and snowmelt is called ______ water

Over-aeration, resulting in DO levels of 5-6, can lead to undesirable microorganisms and filamentous bulking in the sludge.

Operational causes of non-filamentous organisms include over-aeration and the presence of toxic substances.

Aeration techniques include the use of air diffusers and ______, each with its unique advantages and limitations.

Wastewater ponds and lagoons are used for natural purification processes, with aerobic ponds often referred to as polishing or tertiary ponds.

The success of an ______ is often dependent on the performance of the final clarifier.

Trickling filters utilize randomly packed solid medium and are simple with low operating costs but may have odor and clogging problems.

The presence of oxygen in ______ is primarily provided by photosynthesis, and lagoons are distinguished from ______ by artificial aeration to provide oxygen.

Various cures and techniques can be employed to address issues such as adjusting F/M ratio and DO levels, ______, and pre-treating wastewater.

Attached growth systems, such as trickling filters and ______, are populated by a variety of organisms and are effective in treating wastewater.

Filamentous bulking in ______ can be caused by operational and wastewater characteristic factors.

Biotowers use ______ in a vertical arrangement and are suitable for higher porosity and low weight.

Dissolved oxygen (DO) levels are crucial for the aerobic processes, with the ______ being 1.5 – 2.5 mg/L.

Biological wastewater treatment involves the use of microorganisms to convert organics in wastewater into ______ or biomass.

In biological treatment, the rate of biomass production and food utilization is affected by factors such as temperature, pH, toxins, salt concentration, oxidants, and ______.

Microorganisms in biological treatment may be irreparably damaged by sudden changes in environmental factors, requiring a gradual adjustment to a wide range of ______.

The design of biological systems for wastewater treatment requires knowledge of biological principles, kinetics of metabolism, mass balance principles, and ______ operations.

Two types of biological growth/culture used in wastewater treatment are suspended cultures/growth and attached ______.

Design parameters/operational parameters in the activated sludge process include F/M ratio, MLSS, MCRT/SRT, and ______, which affect treatment efficiency and waste activated sludge production.

F/M ratio measures organic loading and affects aeration period and treatment efficiency, with low ratios resulting in high treatment efficiency and little waste activated ______.

MLSS represents the suspended solids in the reactor and is useful in the determination of F/M, sometimes expressed in terms of suspended ______.

MCRT/SRT represents the average time in which microorganisms or solids stay in the reactor, and HRT represents the average time in which the liquid remains in the ______.

Wastewater contains a wide variety of organics and requires a wide variety of organisms or a mixed culture for complete ______.

The microorganisms involved in biological treatment are the same as those in natural freshwater systems but are carefully controlled in engineered reactors to optimize organic ______.

Suspended cultures/growth in wastewater treatment include activated sludge, ponds, and lagoons, with variations such as step aeration, tapered aeration, contact stabilization, pure oxygen activated sludge, oxidation ditch, high rate, and extended ______.

Fine ______ consist of woven wire or cloth perforated plates and should be mechanically cleaned on a continuous basis.

Mechanically-cleaned bar ______ have bar racks 3 to 4 inches apart, while manually-cleaned bar ______ require good flow distribution and velocity control.

Disposal methods for ______ include hauling to disposal areas, burial on the plant site, incineration, disposal with municipal solid wastes, and grinding and returning to the wastewater flow.

Comminution involves shredding ______ to approximately 8 mm in size using devices like a hammermill or a barminutor.

Grit ______ is essential to separate non-biodegradable solids from organic suspended solids, and it includes channel-type horizontal-flow grit chambers, aerated grit chambers, and vortex-type grit chambers.

Grit ______ protect mechanical equipment, reduce heavy deposits, and minimize the frequency of digester cleaning.

Parshall ______ and Palmer-Bowlus ______ are commonly used for flow measurement in wastewater treatment.

Primary ______ involves sedimentation, which separates suspended particles from water through gravitational settling in sedimentation basins or tanks.

Factors affecting ______ tank efficiency include the type of solids, age of wastewater, rate of solids flow, cleanliness, and mechanical condition of the tank.

Sedimentation achieves removal efficiency for settleable solids (90-95%), suspended solids (50-65%), BOD (20-35%), and colloidal solids (not removed unless coagulants are added).

Flow distribution in sedimentation ______ is managed by inlet structures to evenly distribute the flow and prevent short circuiting.

Secondary ______ involves the biological conversion of dissolved and colloidal organics into biomass, which can be subsequently removed by sedimentation.

Types of sewer systems: sanitary sewer system, storm sewer system, and collection water system.

Contaminants of concern in wastewater treatment include suspended solids, biodegradable organics, pathogens, nutrients, priority pollutants, refractory organics, heavy metals, and dissolved oxygen.

The treatment objectives for wastewater treatment are the removal of suspended and floatable material, treatment of biodegradable organics, elimination of pathogenic organisms, removal of toxic compounds, and removal of nitrogen.

Wastewater treatment systems are divided into preliminary, primary, secondary, tertiary, and solids treatment and ______.

Preliminary wastewater treatment involves the removal of large solids to prevent damage to the remainder of the unit operations through screening, comminution, grit removal, and ______.

Primary wastewater treatment aims to remove a portion of suspended solids and organic matter by settling or sedimentation, typically removing about 60% of solids and 30% of ______.

Secondary wastewater treatment is directed principally at the removal of biodegradable organics and suspended solids, including biological treatment by activated sludge, fixed-film reactors, lagoons, and ______ systems.

Tertiary wastewater treatment involves the polishing of secondary effluent, primarily removing nutrients, toxic compounds, increased amounts of organic material, and suspended ______.

Solids treatment and disposal includes the collection, stabilization, and subsequent disposal of the solids removed by other ______.

Wastewater treatment methods are classified into physical unit operations, chemical unit processes, and ______ unit processes.

Preliminary ______ includes screening, the first operation performed on incoming wastewater for the purpose of removing materials that might damage equipment or hinder further ______.

Screening devices are used to remove coarse solids from wastewater, which consist of sticks, rags, boards, and other large objects that find their way to the wastewater collection ______

Study Notes

Studying That Suits You

Description

More Quizzes Like This

Wastewater Treatment Quiz

Wastewater Treatment Quiz: Test Your Knowledge

Wastewater Treatment and Contaminants Quiz

Purpose of Wastewater Treatment

The presence of oxygen in is primarily provided by photosynthesis, and lagoons are distinguished from by artificial aeration to provide oxygen.

Mechanically-cleaned bar have bar racks 3 to 4 inches apart, while manually-cleaned bar require good flow distribution and velocity control.

Parshall and Palmer-Bowlus are commonly used for flow measurement in wastewater treatment.

Preliminary includes screening, the first operation performed on incoming wastewater for the purpose of removing materials that might damage equipment or hinder further .