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23 Cards in this Set

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The amount of solids in water that creates so much pollution is less than ____% of the total amount of water.
1
The abbreviation WWTP stands for __ ___ ___ ____ and is the facility that we treat ____.
waste water treatment plant
sewage
We use the waste water treatment plant to comply with the ___ ___ Act.
Clean Water
Waste Water is a modern term for ...
sewage
In the grit chamber of the WWTP, water slows to remove san. Why must sand be removed?
It damages fan blades of pumps that move water
Water is anaerobic when it enters the WWTP, which means it has...
nearly no oxygnen in it and it smells really bad
Pre-treatment of waste water at the WWTP involves removal of ____ and are merely sent to a dumpster that is taken to the landfill.
large objects that get stuck in a bar screen, such as clothes, sticks, trash, etc.
In a settling basin at the WWTP, ___ is removed from the top and ____ is removed from teh bottom , as the scraper & skimmer slowly turn.
oily, low-density stuff like fats, soap scum, etc.
sludge (mostly fecal solids)
Air is added in the ____ basin so the microorganisms that eat the waste can breathe.
aeration
Water coming INTO a WWTP is called....
influent
During aeration at the WWTP, the nitrates are turned into ___, and the suspended solids are turned into ___ and ___.
nitrogen (N2)
Carbon dioxide (CO2) and Water (H2O)
During aeration, _____ eat the suspended solids and convert them into harmless products.
microorganisms
Some ____ is always being returned to the aeron tank so that there will always be sufficient microorganisms there to consume the incoming waste.
sludge
Before cleaned water from the plant can be put back into the local strea, it must be ____ so it will be free of pathogens
disinfected
One means of disinfection of water is to expose the water to __ __, but this requires that the water be filtered so it will be clear enough for this wrok.
Ultraviolet light (UV)
____ gas is typically used as a disinfectant, but may cause THMs (trihalomethanes) in the local stream.
chlorine
Water EXiting a WWTP is called...
effluent
The sludge or solids from the WWTP can go to the ___ ___ where they can be broken down into methane and other products in an oxygen-free environment.
anaerobic digester
___ gas from an anerobic digester can be used to run engines that are connected to generators that can make ____ for us.
methane
electricity
Wast solids from the WWTP can be d___ by sending it through a belt press, which squeezes water out of it.
de-watered
De-watered waste sludge can be put on ___-food crops or n tree plantation forests or more often is just sent to the .....
non
landfill
Why can waste sludge be put on food crops?
It may contain heavy metals or other toxins that can get into the plants
The WWTP effluent water may look clear and pathogen-free, but can still cause problems because it still may have some.....
nitrates and phosphates in it, which can cause algal blooms in rivers