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;
88 Cards in this Set
- Front
- Back
Sewer systems are designed for |
A 50 year life span |
|
Aerobic |
Fresh, as oxygen |
|
Anaerobic |
Septic, no oxygen |
|
Molecular weight of water |
18g/ mole |
|
Blood is % water |
83 |
|
I’mnoff tank |
2 story, built in 1906 |
|
What is tceq |
State |
|
What is epa |
Federal |
|
Fines are- |
$2500 per day per violation |
|
Dissolved solids |
Solids that can be can through a filter |
|
Settable |
Removed in sedimentation |
|
Non settable |
Removed in secondary process |
|
Acidic ph |
>7 |
|
Ph neutral |
7 |
|
<7 ph |
Basic |
|
A chemical is organic if it will |
Burn |
|
B.O.d. Test indicates |
The strength of sewage 5 days ago |
|
Wastewater is % water |
99.8-99.9% water |
|
Minimum flow |
2ft/sec |
|
Inflow |
Additional flow illegal or unknown taps |
|
Infiltration |
Water entering through cracks |
|
Inverted siphon |
A sewer line that connects one side to another ex: creek |
|
Cross connection |
Physical connection of safe to unsafe water |
|
Alkalinity |
The capacity of water to neutralize acids |
|
Direct beneficial re use of treated effluent |
Protects environment Conserves water for re use Protects down streams supplies of water |
|
Effluent should have a chlorine residual of |
1.0mg/l and have at least 20 minute contact time in the chlorine chamber |
|
When effluent with high BOD and is discharged into a receiving stream- |
The DO decreases |
|
Inorganic solids may contain |
Sand |
|
Any plant with a design flow of .5mgd |
Is required to install instrumentation to measure continuous flow |
|
Increase of organic matter means |
Increase of chlorine demand |
|
Bod test |
How much demand of oxygen is needed to maintain a healthy environment for aerobic microbes |
|
Each person contributes |
.17 lbs of BOD a day |
|
Disadvantages of screening devises |
Frequent cleaning and disposal |
|
Screenings may be disposed by |
Burning Burying Grinding Digestion |
|
Clarifier sludge zones |
Inlet Settling Outlet Sludge |
|
Activated sludge process |
Operates on the principle of concentrated biological activity in a aerobic (oxygen) environment. *secondary process* |
|
Mlvss |
Mixed liquor/ volatile suspended solids |
|
Methane characteristics |
Colorless Odorless Tasteless Flammable |
|
Anaerobic digesters |
The primary purpose is to reduce the amount of solids and also stabilize solids prior to dewatering |
|
Volatile solids reduction is crucial to |
Class a biosolids |
|
Anaerobic digestion phases |
Hydrolysis Acid production Methane production |
|
Aerobic digesters |
DO is maintained by artificial aeration. Aerobic bacteria are the main microbes to carry out digestion |
|
Extreme aerobic digestion (endogenous) |
No food is added so microbes eat themselves |
|
Oxidation ponds |
Most common, aerobic bacteria. 30day DT. 35lbs per day organic loading rate. |
|
Algae |
Autotrophs |
|
Facultative ponds |
2 layers. Upper- very much like oxidation Lower- annoxic ( little oxygen) or anaerobic( no oxygen) |
|
Anaerobic pond |
No D.O Used to treat sewage with high bod |
|
Aerated pond |
8-10ft Mechanically aerated High organic loading rate |
|
A good pond will have an inflow |
With multiple inlets and outlets |
|
Trickling filters parts |
Distribution system Media Tank Under drain |
|
Septic conditions in a TF occur when |
Not enough sloughing if humus sludge |
|
Septic condition in TF |
Anaerobic = bad |
|
Humus sludge |
Sludge from a TF |
|
Growth on a TF |
Zogleal mass |
|
The main purpose of a TF |
Remove settable/ dissolved organic matter through biological stabilization And remove bod |
|
TF efficiency is dependent on |
Recirculation |
|
Bod is used to determine TF |
Efficacy |
|
Problems at TF plants |
Ponding Filter flies Odors |
|
The bell end of a pipe should |
Point up grade (up hill) |
|
If a centrifugal pump has a worn impeller |
It will lose more energy |
|
Disadvantage of pond system |
Amount of land required |
|
Factor important to efficient pond operation |
Prevention of rooted plants near or in pond |
|
What does F and M stand for in FM ratio |
Food to microorganisms |
|
What is preliminarys main purpose |
Remove large solids (Rags) |
|
How many gallons of waste water are contributed each day per person? |
100 gallons |
|
How many feet should water and sewer lines be kept apart? |
9 ft |
|
What equipment may be used by maintenance to inspect sewer lines |
Camera |
|
Organic matter |
All carbon containing substances |
|
Inorganic chemicals |
All substances that don’t contain carbon |
|
Ponding is caused by: |
Clogged drains, hydraulic overload, zoogleal mass, humus sludge could have sloughed onto media, snails, |
|
Ponding is caused by: |
Clogged drains, hydraulic overload, zoogleal mass, humus sludge could have sloughed onto media, snails, |
|
How to fix ponding? |
Chlorinate media |
|
What is bulk sludge? |
Clear supernatant, settles slowly, some floc |
|
What is bulk sludge? |
Clear supernatant, settles slowly, some floc |
|
What would disturb the plant the most? |
Bp filtrate to eq. Basin |
|
What is bulk sludge? |
Clear supernatant, settles slowly, some floc |
|
What would disturb the plant the most? |
Bp filtrate to eq. Basin |
|
Who signs DMRs? |
Elected official (plant manager) |
|
What is bulk sludge? |
Clear supernatant, settles slowly, some floc |
|
What would disturb the plant the most? |
Bp filtrate to eq. Basin |
|
Who signs DMRs? |
Elected official (plant manager) |
|
Do samples once collected are |
Analyzed immediately |
|
Inorganics in grit removal is in which process? |
Primary |
|
Inorganics in grit removal is in which process? |
Primary |
|
Primary clarifier loading due to? |
Surface loading |
|
Inorganics in grit removal is in which process? |
Primary |
|
Primary clarifier loading due to? |
Surface loading |
|
Why is sludge rising? |
Denitrification, gases bubbles |