Wastewater Flashcards
Water is a universal _______________
universal solvent
most abundant element on earth
Why do we treat waste water?
To accelerate the natural purification process of water.
Water self recycles, however humans are easily polluting more water than they can purify.
What is a sanitary sewer system
The underground carriage system that transports sewage to the treatment or disposal
Fraction of US population that is on an individual sewage disposal system
1/3
Most sewer systems move waste products at what rate?
two feet per second or faster
Ideal sewage systems move waste products to the treatment facility within _____ days
within 2 days
Manholes are placed every ________ feet apart in a sewage system to ___________
300-500 feet
to monitor for sewage leaks
Heaviest flow of sewage through the waste water treatment plant is during what hours?
3-9 PM
What are the 5 types of waste water
domestic waste industrial waste ground water storm drain runoff municipal waste
What is domestic waste
sanitary waste out of a home, business or institution
What is industrial waste
from a manufacturing plant, hospital, restaurant etc.
What is ground water waste
ground water can infiltrate into the sewer system by cracks in the sewer pipe
What is storm drain runoff
water from rainstorms and runoff from the streets
What is municipal waste
Any sewage or waste water that is going to be treated. Can be sewage from both domestic and plant sources)
Define leachate
Water that has percolated through a solid and leach out some of the constituents
What percent of raw waste water is solids?
- 2%
98. 8% water
What is gray water
a term for fresh waste water
What is septic water
Black colored waste water with rotten egg smell (hydrogen sulfide) undergoing decomposition. waste water becomes septic when it is not moving and anaerobic decomposition occurs.
What percentage of solids in waste water are organic vs inorganic
75% organic
25% inorganic
Average pH of wastewater
6-9
What are the 3 temperature zones of bacteria
Thermophillic zone
Mesophillic zone
Psychrophillic zone
What is the thermophillic zone
hot zone. bacterial grow in 113F to 158F
what is the mesophillic zone
medium zone. bacteria grow in 59F to 112F
What is the psychrophilic zone
cold zone. bacteria grow 35F to 50F