aeration ppt
TRANSCRIPT
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AERATION
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hat is Aeration?
airremove
modify
water
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does Aeration Work?
Aeration brings water and air inclose contact by :
exposing drops or thinsheets of water to the air
introducing small bubblesof air and letting them risethrough the water
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Treatment
crubbing Oxidation
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Primary application of aerationin water treatment:
!Removal of dissolved gases"onstituents commonly a#ected by
aeration are:$ "arbon dioxide% ðane%'olatile organics% taste ( odor
causing volatile compounds%)ydrogen sul*de
!oxygenation of water
!Removal of iron and manganese
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"arbon +ioxideExcessive amounts of carbondioxide ,above -./- mg012 in rawwater can cause three operating
problems: Increases the acidity of thewater
Tends to 3eep iron in solution
tituents commonly afected
tion
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tituents commonly afected
tionðane
highly 4ammable andexplosive tends to ma3e the water
taste li3e garlic
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tituents commonly afected
tion'olatile organics and taste ( odorcausing volatile compoundsVOCsare organic chemicals that havea high vapor pressure atordinary room temperature and some:
are dangerous to human health can cause harm to the environment
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tituents commonly afected
tion)ydrogen sul*de"an cause:
6oisoning
Rotten.egg odorerious operational problems when
the water contains even smallamounts of hydrogen sul*de:
+isinfection become less
e#ective
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oval o iron and manganese
idation"
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Primary application of aeration
in waste water treatment:
!To supply oxygen to aerobic
biological treatment processes!Air stripping to remove toxic
volatile organics!Air stripping to remove volatilecompounds
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O!ygen #u$$ly
oxygen
needed by bacteria
biodegradation
aeration
provides oxygenbacter
ia
bacteria
utili7e oxygenbrea3down organic
matters
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Air stri$$ing process of moving air through
contaminated water in an above.groundtreatment system removes chemicals called 8volatile
organic compounds9 or 8'O"s9
'O"s can changefrom li;uid to gas
thereforeeasily
evaporates
passing air aids and hastensevaporation
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T
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Water%&nto%Air Aerators
"ascade Aerators
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Water%&nto%Air Aerators
"one Aerators
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Water%&nto%Air Aerators
lat and "o3e Aerators
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Water%&nto%Air Aerators
+raft Aerators
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Water%&nto%Air Aerators
pray Aerators
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Air%&nto%Water Aerators
6ressure Aerators
=INE >?>>1E "OARE >?>>1E
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Air%&nto%Water Aerators
"entrifugal Aerators
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O'(RA)&*+
CO*#&,(RA)&O*#-
"orrosion
=alse "logging of =ilters,Air >inding2
low Removal of
)ydrogen ul*de
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)HR(( .A#&C CO*)RO/
)(#)# AR( R(01&R(, 2ORA(RA)&O*-
+issolved oxygen
p)
Temperature