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135 Cards in this Set
- Front
- Back
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Drinking water |
19 July 1979 and 2 April 1986 |
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State operator certification act |
Act of 538 of 1972 (LA) |
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What must every water and waste water system have? |
A certified operator |
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When must a system have an operator? |
If it has at least 15 service connections Serves an average of at least 25 individual daily at least 60 days out of the year |
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How many operators are required to be on site |
1 |
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Operators cert levels by population |
Level 1 is less then 1000 Level 2 is 1001-5000 Level 3 is 5001-25000 Level 4 is greater then 25,000 |
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If you fail the exam |
You must wait for the same level exam for 90 days |
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What percent of wastewater is water |
99.9 percent |
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What percentage of wastewater is total solid |
0.1% |
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Types of total solids |
DISSOLVED SOLIDS
SUSPENDED SOLID
FLOATABLE SOLIDS |
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Organic |
Biological action |
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Inorganic |
Can not be broken down by biological action Mineral based Usually settlable |
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Influent |
Comes in. Carbon Nitrogen Sulfur |
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Effluent |
Goes out Carbon dioxide Water Ash |
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Sludge |
Bottom of sewage |
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Scum |
Top of sludge |
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Pathogenic Organisms |
Typhoid Cholera Dysentery Polio Hepatitus |
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Ph |
Potential hydrogen |
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Ph 6.0 to 9.0 |
Most DEQ permit limits |
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Ph scale |
0 acid 7 neutral 14 costic |
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Hydrogen sulfide abbreviations |
H2S and it loves concrete |
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What does the work at the plant |
Bacteria |
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ADsorption |
Taking nutrients thru cell walls |
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ABsorption |
Taking nutrients from outside cell |
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What does rotifers have |
Forked tail |
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NH3 |
Ammonia |
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CL2 |
Chlorine |
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OCL |
Hypochondria |
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CLO2 |
Chlorine Dioxide |
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O2 |
Oxygen |
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CO2 |
Carbon Dioxide |
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How many gallons of water a person use |
100 per day |
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Types of samples |
2 Composite Grab |
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Force Main |
Pipe carrying wastewater under pressure from discharge side |
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Lift station |
A pump station that lift waste water to a higher elevation |
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Manhole |
Opening in a line provided for the purpose of entering sewer |
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How far should facility sign be placed |
300 foot |
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How long does it waste water to turn septic |
4 hours |
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Part x11 aka 12, of Louisiana state law separation of water and sewer |
Sewer and water mains shall be laid in separate trenches not less than 6 feet apart horizontally. And crossing water and sewer mains shall have a minimum vertical separation of 18 inches. Water will be above |
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The Louisiana state plumbing code |
Requires clean outs not more than 50 foot apart for 3 inches in diameter and not more than 80 foot apart for line 6 to 4 inches in diameter |
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Scouring velocity |
This is 2.0 feet per second |
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When will the solids in the water column fall out |
When the flow is lower than 2.0 feet per second |
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When will solids always fall out |
When the flow is over 10.0 fps |
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Plug valves |
90 degree 1/4 turn design |
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What causes odor |
H2S causes odor |
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Effects of H2S |
Death at 0.2% |
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1970 to present pipes |
Pvc PE |
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1955 to 1970 pipes |
Clay pipes |
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When will pigs help |
Pigs will help during later cleaning stages |
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How do we use pressure testing |
We maintain a 5 PSI level fo 10 minutes to ensure that we do not have any pinhole leaks |
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How often do you inspect man holes |
1 to 5 years |
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What is key for deflection |
5% |
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The deflection of sewer pipes should not exceed what? |
5 percent |
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There's two types of deflection |
Jump joint: bottom bottom break Drop joint: top and bottom |
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Comminutor |
Grinds material |
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DC |
Direct current |
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Ac |
Alternating current, most common |
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Single phase and 3 phase |
Single; normal user Double phase: heavy duty user |
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Voltage tester |
Test for current |
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Ammeter |
Records Amps in circuit |
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Megger |
Checks insulation resistance |
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Ohmmeter |
Measures resistance in circuit |
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What does fuses do |
To fail when current exceed a certain level of flow |
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Circuit breakers |
Is designed to open when a short circuit exist |
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When to get out? |
When oxygen drops to 19.5 percent. Normal is 21 |
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Classification of pumps |
Submersible Above ground Variable speed |
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What Is the slope of a screw pump |
It has to be 38 degrees |
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What pump has no moving parts? |
Airlift |
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Peristalic pumps |
Has no direct moving parts |
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Advantage of parastalic pumps |
Moving parts has no liquid It can run dry Self priming Can handle corrosive chemicals |
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Airlift pumps can achieve upto how many feet lift |
5 |
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Common pump components |
Motor Shaft Couplings Bearings |
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What are roders |
The part that rotates |
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What are staters |
Parts that stay stationary |
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Adjust compression on ______ to allow a small continuous flow of seal water to escape through |
Packing |
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Each successive ring of packing should be rotated _______ so that the joints are 1/4 turn apart |
90 degrees |
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Allow approximately how many minutes between packing glad adjustments |
15 |
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What seals are widely used in wastewater |
Packing seals and mechanical seals |
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How many leaks do you want in a mechanical pump seal |
0 |
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How many leaks do you want in a packing pump |
20 to 60 drips |
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When is electricity usage higher |
Its higher when starting then when runing. |
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Why are variable pumps good electricity wise |
They gradually increase speed which saves you money |
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What are the two types of pump configuration |
Series and parallel |
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Series pump configuration |
1 by 1 |
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Parallel pump configuration |
All ay once |
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When does cavitation occur |
Pump rate exceeds design conditions Suction line is blocked Suction line is under sized |
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___ percent of pumps problem are on the suction side of the pump |
75 |
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How does priming works |
The air goes out of the pump and replaced with water |
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What is water hammer |
A sudden change in the flow of water |
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LEDQ permit |
Renew 180 days before expiration date Permit is for 5 years |
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Grit |
Heavier than water material |
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What is Weir |
A wall or plate used to measure or control flow |
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NPDES |
National Polutant discharge elimination system |
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MLSS |
Mixed Liquor SUSPENDED Solid |
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PVC |
Polyvinyl Chloride |
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PE |
Polyethylene |
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UV |
Ultraviolet |
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What does disinfection do |
Kills pathogenic organisms |
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Screen |
Screens have spacing of about 3/8 inches to 2 |
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Racks |
Have spacing of about 3 to 4 inches |
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What does comminutor do |
Grinds up |
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What does the barminutor do |
Slices up and return them to the wastewater stream |
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What does bactercides do |
Kills bacteria |
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What does herbicides do |
Kill plants |
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What does algaecide do |
Kill algae |
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What does Fungicides do |
Kills Fungus |
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Measurement of lagoons |
2:1 is suggested inside 4:1 is suggested outside |
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How deep is water colum in a lagoon. |
5 foot deep |
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How deep is weed control |
3 foot deep |
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We control the level of water by adding or deleting one or more of |
The controlling flash board |
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How long does the water need to stay in contact with chlorine |
30 minutes or longer |
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We want a ph of |
7.0 to 8.0 |
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We get overall removal of |
80 to 90% removal |
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Retention time for clarifiers is usually designed to be |
1.5 to 2.0 hours |
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Detention time is usually ____ to ___ hours in the primary |
1 to 2 |
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Trickling filter |
Uses water pressure Provides secondary biological treatment Uses a trickling of water down a media to stimulate bacterial growth |
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What does trickling filter use to to further the elimination of organic in the water system |
Bacterial slime or zoogleal film |
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Parts of a trucking filter include |
Distribution arm Filter media Under drain |
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Digester ph range |
6.4 to 7.4 |
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What does flame traps do |
Keeps it from exploding |
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Chlorine characteristic |
Yellow green cloud Distinctive odor 2and half time havier then air Expands 460 to 1 in air |
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Chlorine a kit |
100 to 150 pounds |
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Chlorine B kit |
1 ton cylinders |
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Chlorine c kit |
Rail tank cars and trucks cargo tanks |
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Chlorine cylinders |
Melts at 158 degrees Allows controlled leak One ton has 3 plugs on both sides |
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What does ammonia vapors in the presence presence of chlorine gas do |
It will show up as white cloud |
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Ozone |
Is 2000 times faster than chlorine Twice as strong as chlorine Blue colored Blocks out IV light Must be generated on site |
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Ozone |
Is 2000 times faster than chlorine Twice as strong as chlorine Blue colored Blocks out IV light Must be generated on site |
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How often do you inspect man hole |
One to five years interval |
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Type of maintenance |
Preventative Corrective Predictive |
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SCBA |
Self Contained Breathing Apparatus |
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Place traffic signs at least |
200 ft apart |
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A ladder must be place how many feet apart in a trench |
25 and must extend 3 feet from top of trench |
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Flow meters must be calibrated |
Once a year |
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Permits |
Good for 5 years Renewal must be submitted at least 180 days prior to expiration date of the old one |
