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waste water treatment
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Created by
ln
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Cards (21)
What are the two main purposes of treating wastewater?
To
reuse
it or
safely
return it to
natural
water sources
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What are the three main sources of wastewater?
Domestic
Agricultural
Industrial
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What does domestic waste refer
to?
Household
waste like
water
from showers,
sinks
, and
toilets
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Where does domestic wastewater go after being flushed?
It goes into the
sewers
and heads for
sewage
treatment plants
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What type of wastewater is produced by agriculture?
Nutrient runoff
from
fields
and
animal waste
from
farms
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What do industrial sources of wastewater typically involve?
Factories
that
make
and
use chemicals
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Why must all wastewater be treated before disposal?
To make it safe and prevent pollution and health risks
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What is generally required for treating domestic and agricultural sewage?
Removing organic matter and harmful microbes
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What additional steps are needed for treating industrial wastewater?
Extra
steps to remove
harmful
chemicals
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What are the three main steps in sewage treatment?
1. Screening to remove large objects
2. Sedimentation to separate sludge and effluent
3. Biological breakdown of organic matter
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What happens during the screening step of sewage treatment?
Large
objects like
twigs
and
plastic bottles
are removed
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What occurs during sedimentation in sewage treatment?
Heavier
solid bits sink to the
bottom
to form
sludge
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What is the difference between effluent and sludge?
Effluent
is the
lighter
part on top, while
sludge
is the
heavier
solid at the bottom
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What conditions are maintained in the effluent tank during biological breakdown?
Aerobic
conditions with
oxygen
supplied
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What conditions are maintained in the sludge tank during biological breakdown?
Anaerobic
conditions with
little
or
no oxygen
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What is produced during anaerobic digestion of sludge?
Methane
, which can be
captured
and
burned
for
energy
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What can the remaining digested waste from sludge be used for?
As fertilizer, as it is rich in nutrients
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What additional stages may be required for wastewater containing toxic substances?
Adding
chemicals to
precipitate
metals or using
ultraviolet
radiation
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Why is treating wastewater considered easier than
desalinating
salt water?
It requires less
effort
and
resources
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Why do some countries rely on treating wastewater for drinking supplies?
Because they have a
limited
water supply
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What is the example of a country that relies on
treating wastewater for drinking supplies
?
Singapore
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