Water Treatment Flashcards
What system does the water treatment plant use?
Uses conventional activated sludge system
Aerobic?
Micro organisms that require oxygen
Anaerobic
Microorganism that does not need oxygen, produces methane
The input is what % domestic and what % industrial water?
80 domestic, 20 water
Why is there two of every equipment?
To ensure constant flow, in case one unit breaks
How many gallons a day does this plant treat?
8 million
How many hours does it take the water to run through the system?
14
What does B.O.D mean and what
Biological oxygen demand- is a measure of the quantity of oxygen used by micro organisms, in the oxidation of organic matter
Activated sludge system
Method of water shed treatment where microorganisms are used to digest the organic materials. Microorganisms are constantly recycled and used
What is the first stage, what happens, where does the water go next
Operations building
- test incoming water
- tests for heavy metals, pesticides, oil, organics
Water goes to the input line and flow meter
What is the second stage, what happens, where does the water go next
Input line/ pit and flow meter
- all water enters here
- if there is to much water intake, overflow goes to the flow equalization basins
Water/ raw sewage enters the first building
What is the third stage, what happens, where does the water go next
Raw sewage enters the first building
- removes solids larger then 1/4.
- grit removal basin- removes coffee grinds, gravel, egg shells
Water goes to the primary clarifiers
What is the fourth stage, what happens, where does the water go next
Primary clarifiers
- water stays here for 2 hours
- contains filamentous bacteria= forms nets that catch stuff as they settle to the bottom
- 90% of sewage is removed here
Sludge goes to the Anaerobic digesters and fluid to the aeration basins
What is the fifth stage, what happens, where does the water go next
Anaerobic digesters
- sludge comes here from the primary clarifiers
- microbes in the digester don’t require oxygen
- microbes produce methane, some of that heat is used to heat digesters to 100 F. Some is used to heat buildings in the site and the rest is burned off.
- detoxified sludge from here is moved to sludge processing
What is the sixth stage, what happens, where does the water go next
Aeration basins - fluid from primary clarifiers come here - water is here 6 hours - 8% of waste removed - tank is aerated, containing Protists - B.O.D. + 2ppm Next, final clarifiers
What is the seventh stage, what happens, where does the water go next
Final clarifiers
- Protists settle out as active sludge and goes to the aeration basins or aerobic digesters
- sludge contains living sewage eating microbes
- 2% sewage removed, last.
Fluid considered clean and goes to UV light station
What is the eighth stage, what happens, where does the water go next
Aerobic digesters
- activated sludge from final clarifiers come here and reduced by canibalism
- 30 days sludge stays
- sludge goes to sludge dewatering/ processing plant
What is the ninth stage, what happens, where does the water go next
UV light station
- water flows through UV
- lethal DNA mutations kill the micro organisms
- prevents disease causing bacteria from entering river
- water returned to the river system
What is the tenth stage, what happens
Sludge processing/ dewatering plant
- Sludge from aerobic and anaerobic digesters pumped here
- polymer added for solid transport
- water is pressed out
- sludge transported to landfill.
- can be mixed with soil, nutrient rich
What year it started?
1984
