Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
123 Cards in this Set
- Front
- Back
- 3rd side (hint)
|
Manually clean bar screen should be drained frequently to prevent which of the following? |
The screen from breaking, septic conditions from developing upstream, a shock load on the plant when eventually cleaned, formation of hydrogen sulfide, which has a rotten egg odor and causes corrosion of concrete and paint. |
|
|
|
What safety precautions should be taken when cleaning a bar screen? |
When cleaning a bar screen check to make sure that your footing will be secure by removing any slippery surfaces such as water and grease. Be certain there is adequate space to safely lift the screens and that there is a receptacle for the cleanings / debris. |
|
|
|
What should be done first of a problem develops in a mechanically cleaned screen? |
Visually identify what appears to be the cause of the problem, then shut off the machine if you must work on the equipment. Any moving equipment is hazardous, regardless of its speed. |
|
|
|
How can screenings be disposed of? |
Covering them with a minimum of 6 inches of earth or by incineration. |
|
|
|
How are comminution Units different from Bar racks and bar screens? |
Directions screens remove the Bree from the waste water walk combination unidebris and leave it in the waste water **** |
|
|
|
How are comminution units different from bar racks and bar screens? |
Bar racks and screens removed debris from the waste water walk comminution units grind up debris and leave it in the waste water. |
|
|
|
What are the advantages of comminuting machines over screens? |
The advantages of comminuting machines over screens include the elimination of screening disposal, flies, and older problems. A disadvantage is that plastic and would maybe rejected and must be removed manually |
|
|
|
What has replaced mercury sills and comminutors ? |
Mechanical seals Have replaced Mercury seals in comminutors. |
|
|
|
What has replaced mercury sills and comminutors ? |
Mechanical seals Have replaced Mercury seals in comminutors. |
|
|
|
Why is it hazardous to handle mercury |
Because it is poisonous and breathe in the fumes may be fatal or cause loss of hair and teeth. |
|
|
|
Putrescible |
Material that will decompose under anaerobic conditions and produce nuisance orders. |
|
|
|
Putrescible |
Material that will decompose under anaerobic conditions and produce nuisance orders. |
|
|
|
Grit is composed mostly of which of the following substances? |
Sand and egg shells. |
|
|
|
Putrescible |
Material that will decompose under anaerobic conditions and produce nuisance orders. |
|
|
|
Grit is composed mostly of which of the following substances? |
Sand and egg shells. |
|
|
|
Why bother removing grits? |
To prevent where and pops, plug lines, and the occupation of valuable space in digesters. |
|
|
|
Putrescible |
Material that will decompose under anaerobic conditions and produce nuisance orders. |
|
|
|
Grit is composed mostly of which of the following substances? |
Sand and egg shells. |
|
|
|
Why bother removing grits? |
To prevent where and pops, plug lines, and the occupation of valuable space in digesters. |
|
|
|
The flow velocity and a great channel can be controlled by |
Varying the number of channels and service in a multiple channel installation, Use of proportional Wiers, Using breaks for cinderblocks to change the cross-section of shape or area of the great chance. However this can cause cleaning, maintenance, and operational problems. |
|
|
|
Putrescible |
Material that will decompose under anaerobic conditions and produce nuisance orders. |
|
|
|
Grit is composed mostly of which of the following substances? |
Sand and egg shells. |
|
|
|
Why bother removing grits? |
To prevent where and pops, plug lines, and the occupation of valuable space in digesters. |
|
|
|
The flow velocity and a great channel can be controlled by |
Varying the number of channels and service in a multiple channel installation, Use of proportional Wiers, Using breaks for cinderblocks to change the cross-section of shape or area of the great chance. However this can cause cleaning, maintenance, and operational problems. |
|
|
|
List the safety hazards that might be encountered while manually cleaning a-grit channel? |
Slipping or a back injury or has that might be encountered will manually clean a great channel. Also, beware of dangerous gases when working in a covered grit channel. There have been instances of gasoline or similar material leaking into the sewer and creating a potentially explosive hazard. |
|
|
|
Putrescible |
Material that will decompose under anaerobic conditions and produce nuisance orders. |
|
|
|
Grit is composed mostly of which of the following substances? |
Sand and egg shells. |
|
|
|
Why bother removing grits? |
To prevent where and pops, plug lines, and the occupation of valuable space in digesters. |
|
|
|
The flow velocity and a great channel can be controlled by |
Varying the number of channels and service in a multiple channel installation, Use of proportional Wiers, Using breaks for cinderblocks to change the cross-section of shape or area of the great chance. However this can cause cleaning, maintenance, and operational problems. |
|
|
|
List the safety hazards that might be encountered while manually cleaning a-grit channel? |
Slipping or a back injury or has that might be encountered will manually clean a great channel. Also, beware of dangerous gases when working in a covered grit channel. There have been instances of gasoline or similar material leaking into the sewer and creating a potentially explosive hazard. |
|
|
|
What is the purpose of the cyclone grit separator? |
The purpose of a cyclone grit seperator Is to separate grit from organic material and wastewater. |
|
|
|
Putrescible |
Material that will decompose under anaerobic conditions and produce nuisance orders. |
|
|
|
Grit is composed mostly of which of the following substances? |
Sand and egg shells. |
|
|
|
Why bother removing grits? |
To prevent where and pops, plug lines, and the occupation of valuable space in digesters. |
|
|
|
The flow velocity and a great channel can be controlled by |
Varying the number of channels and service in a multiple channel installation, Use of proportional Wiers, Using breaks for cinderblocks to change the cross-section of shape or area of the great chance. However this can cause cleaning, maintenance, and operational problems. |
|
|
|
List the safety hazards that might be encountered while manually cleaning a-grit channel? |
Slipping or a back injury or has that might be encountered will manually clean a great channel. Also, beware of dangerous gases when working in a covered grit channel. There have been instances of gasoline or similar material leaking into the sewer and creating a potentially explosive hazard. |
|
|
|
What is the purpose of the cyclone grit separator? |
The purpose of a cyclone grit seperator Is to separate grit from organic material and wastewater. |
|
|
|
Why is it necessary or desirable to wash grit? |
To remove organic material before disposal. If the organic matter is not removed, then odors could develop. If used as fill material, the Fill could settle when the organics decompose. |
|
|
|
Putrescible |
Material that will decompose under anaerobic conditions and produce nuisance orders. |
|
|
|
Grit is composed mostly of which of the following substances? |
Sand and egg shells. |
|
|
|
Why bother removing grits? |
To prevent where and pops, plug lines, and the occupation of valuable space in digesters. |
|
|
|
The flow velocity and a great channel can be controlled by |
Varying the number of channels and service in a multiple channel installation, Use of proportional Wiers, Using breaks for cinderblocks to change the cross-section of shape or area of the great chance. However this can cause cleaning, maintenance, and operational problems. |
|
|
|
List the safety hazards that might be encountered while manually cleaning a-grit channel? |
Slipping or a back injury or has that might be encountered will manually clean a great channel. Also, beware of dangerous gases when working in a covered grit channel. There have been instances of gasoline or similar material leaking into the sewer and creating a potentially explosive hazard. |
|
|
|
What is the purpose of the cyclone grit separator? |
The purpose of a cyclone grit seperator Is to separate grit from organic material and wastewater. |
|
|
|
Why is it necessary or desirable to wash grit? |
To remove organic material before disposal. If the organic matter is not removed, then odors could develop. If used as fill material, the Fill could settle when the organics decompose. |
|
|
|
Detritus |
The heavy material present in wastewater such as sand, coffee grounds, eggshells, gravel, and senders. Also called grit. |
|
|
|
Putrescible |
Material that will decompose under anaerobic conditions and produce nuisance orders. |
|
|
|
Grit is composed mostly of which of the following substances? |
Sand and egg shells. |
|
|
|
Why bother removing grits? |
To prevent where and pops, plug lines, and the occupation of valuable space in digesters. |
|
|
|
The flow velocity and a great channel can be controlled by |
Varying the number of channels and service in a multiple channel installation, Use of proportional Wiers, Using breaks for cinderblocks to change the cross-section of shape or area of the great chance. However this can cause cleaning, maintenance, and operational problems. |
|
|
|
List the safety hazards that might be encountered while manually cleaning a-grit channel? |
Slipping or a back injury or has that might be encountered will manually clean a great channel. Also, beware of dangerous gases when working in a covered grit channel. There have been instances of gasoline or similar material leaking into the sewer and creating a potentially explosive hazard. |
|
|
|
What is the purpose of the cyclone grit separator? |
The purpose of a cyclone grit seperator Is to separate grit from organic material and wastewater. |
|
|
|
Why is it necessary or desirable to wash grit? |
To remove organic material before disposal. If the organic matter is not removed, then odors could develop. If used as fill material, the Fill could settle when the organics decompose. |
|
|
|
Detritus |
The heavy material present in wastewater such as sand, coffee grounds, eggshells, gravel, and senders. Also called grit. |
|
|
|
Ozonation |
The application of O-Zone to water, waste water, or air, generally for the purposes of this infection or odor control. |
Hey |
|
|
What is the main difference between the slides for my primary and a secondary clarifier’s? |
Density of sludge |
|
|
|
What is the main difference between the slides for my primary and a secondary clarifier’s? |
Density of sludge |
|
|
|
What is the main difference between the effluent from primary and secondary clarifier’s? |
The clarity of the water |
|
|
|
That’s the significant items to check before start up of a circular clarifier? |
Control gauge for operation, check tank for sanding to Bree, check lubrication oil level, driveline, and complete assembly, check gaskets, gears, drive chain sprockets, and drive motor for proper installation rotation Squeegee blades on the collector plows for proper distance from the floor of the tank Check all other mechanical items below the waterline for proper insulation operation Check tank sumps or hoppers and return lines for debris and obstructions Check tank structure for corrosion, cracks and other indications of structural failure |
|
|
|
What city precautions should be taken during start up of the clarifier? |
Wear a hardhat went downtown for protection from falling objects Keep hands away from moving equipment When working on equipment, be sure to tag and use a lockout device on the main circuit breaker and influent control gauge to preventequipment from starting unexpectedly and causing equipment damage or personal injury |
|
|
|
What happens when the flights in a rectangular clarify or not straight across the tank ? |
Sludge will be piled higher on the trailing side or the flights will hang up and cause severe damage to the flights |
|
|
|
The best operational strategy for a clarifiers? |
To develop and implement a good preventative maintenance program to closely monitor operating conditions, and to respond to any lab results that indicate problems are developing |
|
|
|
Abnormal conditions influencing clarifier performance include? |
Toxic waste from industrial spills or dumps storm flows and hydraulic overloads Septicity from collection system problems s |
|
|
|
Abnormal conditions influencing clarifier performance include? |
Toxic waste from industrial spills or dumps storm flows and hydraulic overloads Septicity from collection system problems s |
|
|
|
Steps that could be taken to improve clarifier effluent quality when excess storm flow infiltration is a frequent problem? |
Sealing of the sanitary sewers or use of a float equalization basin |
|
|
|
Common chlorine residual range for primary clarifier’s? |
.5–3.0 mg/L |
|
|
|
Common chlorine residual range for primary clarifier’s? |
.5–3.0 mg/L |
|
|
|
Common range for coliform route bacteria and primary clarifier’s |
5000-2,000,000 per 100mL |
|
|
|
Common chlorine residual range for primary clarifier’s? |
.5–3.0 mg/L |
|
|
|
Common range for coliform route bacteria and primary clarifier’s |
5000-2,000,000 per 100mL |
|
|
|
Common pH range for primary clarifier’s effluent |
6.5 - 8.0 |
|
|
|
Common chlorine residual range for primary clarifier’s? |
.5–3.0 mg/L |
|
|
|
Common range for coliform route bacteria and primary clarifier’s |
5000-2,000,000 per 100mL |
|
|
|
Common pH range for primary clarifier’s effluent |
6.5 - 8.0 |
|
|
|
Common temperature range for primary clarifier’s effluent? |
50 - 85 F |
|
|
|
Common chlorine residual range for primary clarifier’s? |
.5–3.0 mg/L |
|
|
|
Common range for coliform route bacteria and primary clarifier’s |
5000-2,000,000 per 100mL |
|
|
|
Common pH range for primary clarifier’s effluent |
6.5 - 8.0 |
|
|
|
Common temperature range for primary clarifier’s effluent? |
50 - 85 F |
|
|
|
Common BOD range for primary clarifier’s influent and effluent ? |
Influent 150-400 mg/L Effluent 50-150 mg/L |
|
|
|
Common suspended solids range for primary clarifier’s? |
Influent 150-400mg/L Effluent 50-150mg/L |
|
|
|
Common range of settle of all solids for primary clarifier’s? |
Influent 5-15mL/L Effluent.3-3.0mL/L |
|
|
|
Daily common range of dissolved oxygen from primary clarifier’s Effluent? |
0-2mg/L |
|
|
|
Primary clarifier expected removal efficiencies of Water quality indicators such as? |
Settleable solids 95% to 99% Suspended solids 40% to 60% Total solids 10% to 15% BOD 20% to 50% Bacteria 25% to 75% PH 6.5 to 8.0 |
|
|
|
Primary clarifier expected removal efficiencies of Water quality indicators such as? |
Settleable solids 95% to 99% Suspended solids 40% to 60% Total solids 10% to 15% BOD 20% to 50% Bacteria 25% to 75% PH 6.5 to 8.0 |
|
|
|
Basic laboratory test used to determine clarifier efficiency? |
Dissolved oxygen, settle of all solids, pH, temperature, DOD, suspended solids, chlorine residual, coliform group bacteria, |
|
|
|
How often should slugs be removed from clarifiers |
Anywhere from 30 minutes to 8 hours, and some instances 24 hours |
|
|
|
How to tell when to start pumping sludge? |
If the samples show a thin sludge it is time to stop pumping |
|
|
|
The most important safety considerations work around trip plans are? |
Gases, falls, drowning, Strains and over exertion, electric shock. |
|
|
|
Common sedimentation a flotation units are |
Primary clarifier’s Secondary clarifier’s Combine sedimentation and digestion units Flotation units Imhoff tanks |
|
|
|
Short-circuiting occurs 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 to allow sufficient time for settling to occur |
|
|
|
Short-circuiting occurs 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 to allow sufficient time for settling to occur |
|
|
|
Short-circuiting is undesirable because? |
Where the velocity is too high, particles will not have time to settle. Where the velocity is too low, undesirable septic conditions may develop. |
|
|
|
Short circuiting may be corrected by? |
Installing weir plates, baffles, port openings, and by proper design of the inlet channel. |
|
|
|
Short circuiting may be corrected by? |
Installing weir plates, baffles, port openings, and by proper design of the inlet channel. |
|
|
|
Most common types of Biological processes are |
Activated sludge process, the trickling filter’s, and rotating biological contactors. |
|
|
|
Why are secondary clarifiers needed in secondary treatment plants? |
The biological treatment processes following the primary clarifier convert more solids to the settleable form and also produce floc containing micro organisms that have to be removed from the treated wastewater |
|
|
|
What causes Ponding? |
Fill voids Excessive organic Loading without a corresponding high recirculation rate Lack of good primary clarification prior to filter Media that are too small or not sufficiently uniform in size Poor or improper media permitting cementing or break up, accumulation of fibers or trashing the filter voids Hey hi organic growth rate followed by a shark load in rapid, uncontrolled sloughing, or an excessive growth of insect larva or snails, which may accumulate in the voids. |
|
|
|
To correct the ponding problem? |
Increasing hydraulic loading increasing recirculation rate Adjusting the orifices on the distributor assembly Spray the filter service will high-pressure water stream or stop the rotary distributor over the pond area and allowed to flush the growth from the voids Hand turn or stir the filter service with a rake, fork, or bar Does the filter with chlorine at about 5 mg/L for several hours Flood the filter keep in the media submerge for 24 hours cause the growth of slough someone Shut off the floor of the filter for several hours. The growth will dry could be removed by the use of a leaf rake. |
|
|
|
To control Odor problems in a trickling filter? |
1. Maintain aerobic conditions in the sewer collection system and in the primary treatment units 2. Check the ventilation for obstructions in the under drain system. Examine the ventilation facility such as the draft two or other inlets for stoppages. 3. Increase the recirculation rate to provide more oxygen to the filter bed and increase sloughing 4. Keep the waste water splashed from the distributor away from exposed structures, grass, and other surfaces. 5. In some cases during hot weather commercially available masking agents may be needed 6. For covered filters, a forced air ventilation system and odor control of the exhaust airstream is usually provided. |
|
|
|
Trickling filter flies can be controlled by? |
1. Increasing the recirculation rate 2. Keeping orifice openings clear, included in gates of distributor arms 3. Applying approved insecticides with caution to filter walls and to the other plant structures 4. Flood in the field for 24 hours at intervals frequent enough to prevent completion of the lifecycle 5. Dosing with about 1 mg/L chlorine for a few hours each week 6. Keep in the area around the filter clean, including removing weeds, cutting grass, and pruning shrubbery |
|
|
|
I should’ve trickling filter not be taken out of service during icy conditions |
Because the quality of the effluent will be reduced and additional maintenance proms could develop. |
|
|
|
The recirculation rate of trickling filters should be adjusted to maintain a dissolved oxygen content of what in regards to rock media and synthetic media of The filter effluent |
3 to 6 mg/L for rock media 4 to 8 mg/L for synthetic media |
|
|
|
Hydraulic loadings for primary clarifier’s should not be greater than what? |
Should not be greater than 900 to 1200 Gpd/sq ft for average conditions and should be less than 2000 to 3000 GPD/sq ft For peak conditions |
|
|
|
What are the three types of trickling filters |
Standard rate filters High rate filters Roughinging filters |
|
|
|
What are the hydraulic loading ranges for standard rate trickling filter’s? |
25 to 100 gal/day/sq ft |
|
|
|
What are the ranges for organic BOD loading BOD/day/1000 cu ft for a standard rate trickling filter’s? |
5 to 25 lbs/BOD/day/1000 cu ft |
|
|
|
What are the ranges for organic BOD loading BOD/day/1000 cu ft for a standard rate trickling filter’s? |
5 to 25 lbs/BOD/day/1000 cu ft |
|
|
|
What is the normal filter media for a standard rate trickling filter? |
6 to 8 feet, usually rock, with application to the filter by rotating distributor |
|
|
|
What are the ranges for organic BOD loading BOD/day/1000 cu ft for a standard rate trickling filter’s? |
5 to 25 lbs/BOD/day/1000 cu ft |
|
|
|
What is the normal filter media for a standard rate trickling filter? |
6 to 8 feet, usually rock, with application to the filter by rotating distributor |
|
|
|
The affluent from a standard rate filter treating municipal waste water is usually quite stable with BOD’s as low as? |
20 to 25 mg/L |
|
|
|
Recommended hydraulic loading for a higher rate trickling filter range from? |
100 to 1000 gal/day/square feet For rock 350 to 2100 gal/day/square feet for synthetic media 25 to 100 pounds of BOD/day/1000 ft.³ for rock 50 to 300 pounds BOD/day/1000 ft.³ for synthetic media These filters are designed to receive wastewater continually and practically all high rate installations use recirculation. |
|
|
|
Recommended hydraulic loading for a higher rate trickling filter range from? |
100 to 1000 gal/day/square feet For rock 350 to 2100 gal/day/square feet for synthetic media 25 to 100 pounds of BOD/day/1000 ft.³ for rock 50 to 300 pounds BOD/day/1000 ft.³ for synthetic media These filters are designed to receive wastewater continually and practically all high rate installations use recirculation. |
|
|
|
Media types for trickling filters consist of? |
Rock, slag, coal , bricks, redwood blocks, molded plastic, or any other sound, durable material |
|
|
|
Recommended hydraulic loading for a higher rate trickling filter range from? |
100 to 1000 gal/day/square feet For rock 350 to 2100 gal/day/square feet for synthetic media 25 to 100 pounds of BOD/day/1000 ft.³ for rock 50 to 300 pounds BOD/day/1000 ft.³ for synthetic media These filters are designed to receive wastewater continually and practically all high rate installations use recirculation. |
|
|
|
Media types for trickling filters consist of? |
Rock, slag, coal , bricks, redwood blocks, molded plastic, or any other sound, durable material |
|
|
|
What size rock is used for media and trickling filters |
2 inches to 4 inches |
|
|
|
Recommended hydraulic loading for a higher rate trickling filter range from? |
100 to 1000 gal/day/square feet For rock 350 to 2100 gal/day/square feet for synthetic media 25 to 100 pounds of BOD/day/1000 ft.³ for rock 50 to 300 pounds BOD/day/1000 ft.³ for synthetic media These filters are designed to receive wastewater continually and practically all high rate installations use recirculation. |
|
|
|
Media types for trickling filters consist of? |
Rock, slag, coal , bricks, redwood blocks, molded plastic, or any other sound, durable material |
|
|
|
What size rock is used for media and trickling filters |
2 inches to 4 inches |
|
|
|
What are the media death ranges for trickling filters |
38 feet for rock media 15 to 30 feet for synthetic media |
|
|
|
Trickling filters, biological oxidation beds, and rotating biological contactors consist of three basic parts? |
thee media The underdrain Distribution systems Retaining walls |
|
