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100 Cards in this Set
- Front
- Back
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What is the main difference between the sludge from primary and secondary clarifiers? |
Primary sludge is denser than secondary sludge. |
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What is the main difference between effluent from primary and secondary clarifiers? |
Effluent from secondary clarifier is normally cleaner than primary Effluent |
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List of the significant items to check before start up on a circular clarifier |
List of the significant items to check before start up on a circular clarifier |
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What safety precautions should be taken during start up of a clarifier? |
Back (Definition) |
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What happens when the flights in a rectangular clarified or not straight across the tank? |
Sludge will be piled higher on the trailing side of the flights will hang up and cause severe damage to the flights |
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What types of abnormal conditions could affect clarifier performance? |
One toxic waste from industrial spills or dumps to storm flows in hydraulic overloads septicity from collection system problems |
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What steps could be taken to improve clarifier effluent quality when excessive storm flow infiltration is a frequent problem? |
Ceiling of a sanitary sewers or use of a flow equalization basin |
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List the basic laboratory test to use to determine the clarifier efficiency? |
DO, pH, temperature, BOD, suspended solids, chlorine residual if needed, and coliform group bacteria |
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At what to points should samples be collected for measuring clarifier efficiency? |
Influent and effluent |
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About what percentage of settable solid should be expected to be removed from the clarifier? |
95 to 99% of sellable solids |
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How often should sludge be removed from a clarifier? |
Remove sludge from my clarifier off enough to prevent septic conditions or sludge gasification The proper interval is dependent on many conditions and may vary from 7:30 hours and as much as 24 hours in a few instances |
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How can floaty material be kept from the clarifier effluent |
Primary clarifier is often have a scum collection area where the scammer scammed off of some mechanical method usually scare me an arm or a paddle wheel if mechanical methods are not provided hand tools maybe use such as skimming dipper attached to a broom handle |
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What is short-circuiting in a clarifier? |
When the flow is not uniform throughout the tank. In this situation the water flows to rapidly in one or more sections of the clarifier not to allow sufficient time for settling to occur. |
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Why is short-circuiting undesirable? |
Where the velocity is to high particles will not have time to settle where the velocity is too low undesirable septic conditions may develop |
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Why is short-circuiting undesirable? |
Where the velocity is to high particles will not have time to settle where the velocity is too low undesirable septic conditions may develop |
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How can short circuit in be corrected? |
By installing weird plates baffles port openings and by proper design of the inlet channel |
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Why are secondary clarifier is needed in secondary treatment plants? |
The biological treatment process following the primary clarifier convert more solids to the settable form and also produce flock containing micro organisms that have to be removed from the treated wastewater. Because of the need to remove these additional solids the secondary clarifier is considered part of these other types of processes |
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What is usually done with the sludge that collects in secondary clarifiers |
Is disposed of depending on the Particular plant design and the characteristics of the sludge sometimes disposal is accomplished by transferring the sludge to a primary settling tank to be settled with the primary/other times it is transferred directly to the digestion system |
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What is usually done with the sludge that collects in secondary clarifiers |
Is disposed of depending on the Particular plant design and the characteristics of the sludge sometimes disposal is accomplished by transferring the sludge to a primary settling tank to be settled with the primary/other times it is transferred directly to the digestion system |
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Would you place the flotation process before or after primary sedimentation? |
After |
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What are colloids? |
Very small finally divided solid particles that do not dissolve they remain disbursed in liquid for a long time due to their small size and electrical charge |
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What are colloids? |
Very small finally divided solid particles that do not dissolve they remain disbursed in liquid for a long time due to their small size and electrical charge |
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What is emulsion? |
A liquid mixture of two or more liquid substance is not normally dissolved in one another but one liquid held in suspension in the other |
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What are colloids? |
Very small finally divided solid particles that do not dissolve they remain disbursed in liquid for a long time due to their small size and electrical charge |
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What is emulsion? |
A liquid mixture of two or more liquid substance is not normally dissolved in one another but one liquid held in suspension in the other |
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Why is the flotation process used in some waste water treatment plants? |
To remove colloids and emulsions |
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What are colloids? |
Very small finally divided solid particles that do not dissolve they remain disbursed in liquid for a long time due to their small size and electrical charge |
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What is emulsion? |
A liquid mixture of two or more liquid substance is not normally dissolved in one another but one liquid held in suspension in the other |
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Why is the flotation process used in some waste water treatment plants? |
To remove colloids and emulsions |
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Give a brief description of the vacuum flotation process. |
Consists of aerating the waste water and creating a vacuum to pull out the air which will carry the sides to the water surface |
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What are colloids? |
Very small finally divided solid particles that do not dissolve they remain disbursed in liquid for a long time due to their small size and electrical charge |
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What is emulsion? |
A liquid mixture of two or more liquid substance is not normally dissolved in one another but one liquid held in suspension in the other |
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Why is the flotation process used in some waste water treatment plants? |
To remove colloids and emulsions |
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Give a brief description of the vacuum flotation process. |
Consists of aerating the waste water and creating a vacuum to pull out the air which will carry the solids to the water surface |
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What is a combined sedimentation digestion unit |
Consists of a small clarifier constructed over a sledge digester treatment units of this type have been designed and constructed to serve small populations |
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What are colloids? |
Very small finally divided solid particles that do not dissolve they remain disbursed in liquid for a long time due to their small size and electrical charge |
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What is emulsion? |
A liquid mixture of two or more liquid substance is not normally dissolved in one another but one liquid held in suspension in the other |
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Why is the flotation process used in some waste water treatment plants? |
To remove colloids and emulsions |
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Give a brief description of the vacuum flotation process. |
Consists of aerating the waste water and creating a vacuum to pull out the air which will carry the sides to the water surface |
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What is a combined sedimentation digestion unit |
Consists of a small clarifier constructed over a sledge digester treatment units of this type have been designed and constructed to serve small populations |
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How can you force settled material into a digestion compartment? |
By pushing it through the connecting slot with a squeegee dragging a chain on the floor and allowing it to pass through the slot is another method for removing the sludge accumulation |
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What are colloids? |
Very small finally divided solid particles that do not dissolve they remain disbursed in liquid for a long time due to their small size and electrical charge |
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What is emulsion? |
A liquid mixture of two or more liquid substance is not normally dissolved in one another but one liquid held in suspension in the other |
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Why is the flotation process used in some waste water treatment plants? |
To remove colloids and emulsions |
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Give a brief description of the vacuum flotation process. |
Consists of aerating the waste water and creating a vacuum to pull out the air which will carry the sides to the water surface |
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What is a combined sedimentation digestion unit |
Consists of a small clarifier constructed over a sledge digester treatment units of this type have been designed and constructed to serve small populations |
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How can you force settled material into a digestion compartment? |
By pushing it through the connecting slot with a squeegee dragging a chain on the floor and allowing it to pass through the slot is another method for removing the sludge accumulation |
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How can you maintain a fairly level sledge blanket in a digester portion of an imhoff tank? |
By reversing the direction of the flow at regular intervals |
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What are colloids? |
Very small finally divided solid particles that do not dissolve they remain disbursed in liquid for a long time due to their small size and electrical charge |
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What is emulsion? |
A liquid mixture of two or more liquid substance is not normally dissolved in one another but one liquid held in suspension in the other |
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Why is the flotation process used in some waste water treatment plants? |
To remove colloids and emulsions |
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Give a brief description of the vacuum flotation process. |
Consists of aerating the waste water and creating a vacuum to pull out the air which will carry the sides to the water surface |
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What is a combined sedimentation digestion unit |
Consists of a small clarifier constructed over a sledge digester treatment units of this type have been designed and constructed to serve small populations |
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How can you force settled material into a digestion compartment? |
By pushing it through the connecting slot with a squeegee dragging a chain on the floor and allowing it to pass through the slot is another method for removing the sludge accumulation |
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How can you maintain a fairly level sledge blanket in a digester portion of an imhoff tank? |
By reversing the direction of the flow at regular intervals |
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Describe the sludge from an Imhoff tank that it is operating properly. |
Odorless or has a musty smell and it is black or very dark in color |
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What are colloids? |
Very small finally divided solid particles that do not dissolve they remain disbursed in liquid for a long time due to their small size and electrical charge |
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What is emulsion? |
A liquid mixture of two or more liquid substance is not normally dissolved in one another but one liquid held in suspension in the other |
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Why is the flotation process used in some waste water treatment plants? |
To remove colloids and emulsions |
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Give a brief description of the vacuum flotation process. |
Consists of aerating the waste water and creating a vacuum to pull out the air which will carry the sides to the water surface |
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What is a combined sedimentation digestion unit |
Consists of a small clarifier constructed over a sledge digester treatment units of this type have been designed and constructed to serve small populations |
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How can you force settled material into a digestion compartment? |
By pushing it through the connecting slot with a squeegee dragging a chain on the floor and allowing it to pass through the slot is another method for removing the sludge accumulation |
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How can you maintain a fairly level sledge blanket in a digester portion of an imhoff tank? |
By reversing the direction of the flow at regular intervals |
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Describe the sludge from an Imhoff tank that it is operating properly. |
Odorless or has a musty smell and it is black or very dark in color |
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What is primary treatment good at removing |
Settable solids scam or floatable solids |
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What are colloids? |
Very small finally divided solid particles that do not dissolve they remain disbursed in liquid for a long time due to their small size and electrical charge |
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What is emulsion? |
A liquid mixture of two or more liquid substance is not normally dissolved in one another but one liquid held in suspension in the other |
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Why is the flotation process used in some waste water treatment plants? |
To remove colloids and emulsions |
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Give a brief description of the vacuum flotation process. |
Consists of aerating the waste water and creating a vacuum to pull out the air which will carry the sides to the water surface |
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What is a combined sedimentation digestion unit |
Consists of a small clarifier constructed over a sledge digester treatment units of this type have been designed and constructed to serve small populations |
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How can you force settled material into a digestion compartment? |
By pushing it through the connecting slot with a squeegee dragging a chain on the floor and allowing it to pass through the slot is another method for removing the sludge accumulation |
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How can you maintain a fairly level sledge blanket in a digester portion of an imhoff tank? |
By reversing the direction of the flow at regular intervals |
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Describe the sludge from an Imhoff tank that it is operating properly. |
Odorless or has a musty smell and it is black or very dark in color |
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What is primary treatment good at removing |
Settable solids scam or floatable solids |
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What is primary treatment not nearly as effective as removing |
Lighter suspended solids or dissolved solids which may have excerpt a strong oxygen demand on the receiving Waters |
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What is the purpose of a secondary treatment |
To convert dissolved or suspended materials into a form more readily separated from the water being treated this process produces an overall plant removal of suspended solids and BOD of 90% or more |
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What is the purpose of a secondary treatment |
To convert dissolved or suspended materials into a form more readily separated from the water being treated this process produces an overall plant removal of suspended solids and BOD of 90% or more |
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What causes the distributor arms or pipes to rotate on a trickling filter |
Due to the force of the waste water flowing out of the orifices as with a lawn sprinkler or a fire hose or they may rotate by mechanical means a motor or gears |
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What is the purpose of a secondary treatment |
To convert dissolved or suspended materials into a form more readily separated from the water being treated this process produces an overall plant removal of suspended solids and BOD of 90% or more |
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What causes the distributor arms or pipes to rotate on a trickling filter |
Due to the force of the waste water flowing out of the orifices as with a lawn sprinkler or a fire hose or they may rotate by mechanical means a motor or gears |
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What are the three general classifications of trickling filters |
Standard rate, high rate, Roughing filters |
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What is the purpose of a secondary treatment |
To convert dissolved or suspended materials into a form more readily separated from the water being treated this process produces an overall plant removal of suspended solids and BOD of 90% or more |
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What causes the distributor arms or pipes to rotate on a trickling filter |
Due to the force of the waste water flowing out of the orifices as with a lawn sprinkler or a fire hose or they may rotate by mechanical means a motor or gears |
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What are the three general classifications of trickling filters |
Standard rate, high rate, Roughing filters |
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What are the principal differences between standard rate and high rate filters |
Include BOD loading hydraulic loading depth of the media recirculation and effluent quality |
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What is the purpose of a secondary treatment |
To convert dissolved or suspended materials into a form more readily separated from the water being treated this process produces an overall plant removal of suspended solids and BOD of 90% or more |
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What causes the distributor arms or pipes to rotate on a trickling filter |
Due to the force of the waste water flowing out of the orifices as with a lawn sprinkler or a fire hose or they may rotate by mechanical means a motor or gears |
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What are the three general classifications of trickling filters |
Standard rate, high rate, Roughing filters |
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What are the principal differences between standard rate and high rate filters |
Include BOD loading hydraulic loading depth of the media recirculation and effluent quality |
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During the start up of a trickling filter why should the plant effluent be heavily chlorinated? |
The slime growth is not completely developed and an unstable effluent will be produced |
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What is the purpose of a secondary treatment |
To convert dissolved or suspended materials into a form more readily separated from the water being treated this process produces an overall plant removal of suspended solids and BOD of 90% or more |
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What causes the distributor arms or pipes to rotate on a trickling filter |
Due to the force of the waste water flowing out of the orifices as with a lawn sprinkler or a fire hose or they may rotate by mechanical means a motor or gears |
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What are the three general classifications of trickling filters |
Standard rate, high rate, Roughing filters |
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What are the principal differences between standard rate and high rate filters |
Include BOD loading hydraulic loading depth of the media recirculation and effluent quality |
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During the start up of a trickling filter why should the plant effluent be heavily chlorinated? |
The slime growth is not completely developed and an unstable effluent will be produced |
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What may happen to a clarifier effluent if the clarifier is not operated within designed hydraulic loading’s? |
Hello design hydroclones the solids in a clarifier will become septic and caused a poor effluent.When hydraulic loading is too high some solids may be washed out of the clarifier |
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What is the first thing an operator should do before shutting down a trickling filter |
Plan what you were going to do |
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What are some of the causes of ponding |
Excessive organic loading without a corresponding height recirculation rate or use of media that are too small |
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What are some of the causes of ponding |
Excessive organic loading without a corresponding height recirculation rate or use of media that are too small |
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What are four possible sources of abnormal plant inflow conditions |
One stormwater inflow and groundwater infiltration Two broken collection system pipe that permits excess flow from ground water or creek or stream three clearance of a mainline sewer stoppage for industrial discharge |
