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