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Extended Aeration Sbr
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7/17/2019 Extended Aeration Sbr
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Site visit
8.00 am – 1.00 pm,29/4/13
Group assignment
• Prepare a report about yourvisit to the treatment pants.
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Before your visit
! goo" i"ea is to "o some preiminaryresear#h on the operations o$ the pant /#ompany.
1. %se the internet, #ompany reports, an"boo&s to investigate some o$ theprimary pro#esses.
2. 'hin& about (hat you area"y &no(about the #ompany, ist as mu#hin$ormation an" (or& $rom there.
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During your visit
)uring your visit try to be a#tiveyengage" in (hat you are e*perien#ing
TIPS:
1. Ask questions when you have theopportunity. Sta involve in presentingthe operations of the !o"pany are likelyto e#pe!t questions$ an are usually"ore than happy to a!!o""oate.
%. Prepare so"e questions &efore you visit$&ut then "oify the" where possi&le.
'. (se question asking perios to ask anyquestions that "ight help with the
writing up of your assign"ent.
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During your visit
! $urther goo" habit to get in to is ta&ingnotes "uring your visit. %se any pra#ti#aopportunity to re#or" any impressions /observations you have o$ a aspe#ts o$ the
visit.Site )isit *eport +he!klist+a&e sure be$ore your site visit you have
-ea" up on the site you are visiting he#&e" the (ebsite o$ the #ompany $or reevant
in$ormation Prepare" a ist o$ uestions to as& sta -ea" any assessment in$ormation - you visit the
5e" Prepare" a noteboo& $or ma&ing notes as you go (ith
hea"ings prepare".
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,any site visit reports ten toin!lue so"e or all of the followingse!tions: an e#e!utive su""ary$ an
introu!tion$ a &rief overview of thelo!ation$ aes!ription of pro!esses at the plant$a se!tion where o&servations an
re-e!tions on the plant areis!usse$ an so"eti"esre!o""enations.
6riting up your site visit report
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7*ten"e" aerationa#tivate" su"ge
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!#tivate" su"ge – an overvie(
Primary
treatment
Secondary
treatment
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!#tivate" su"ge pro#ess variations
• Step aeration
•
'apere" aeration• *i"ation"it#h
• *ten"e" aeration :!;
• Seuen#ing at#h -ea#tor :S-;
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• !erobi# pro#ess• %se" e*tensivey $or prefa&ri!ate
pa!kage treat"ent plants to treat
(aste(ater in sma #ommunities, oron in"ivi"ua properties. aerationbasin may be #astinpa#e #on#rete
or stee tan& $abri#ate" in $a#tory.• <an"ing o( voume o$ (aste.
*ten"e" aeration
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• +e#hani#a simpi#ity 'he ra(se(age goes straight to the aerationtan& $or treatment.
• 7*ten"e" aeration 'he mi*ture isaerate" onger than usua. 'hisao(s organisms to &eep gro(ing
an" $ee"ing, brea&ing "o(n thesu"ge.
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S!he"ati! low +hart of an /#tene Aeration Syste"
Aerationtank
FinalClarifer
I0(/0T2 *A3
S/3A4/
T*/AT/D/(/0
T
3AST/D
S(D4/
S(D4/*/T(*0
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,ass Balan!e•
'he mass baan#e #on#ept is base" on the$un"amenta physi#a prin#ipe that matter#an neither be #reate" nor "estroye".
• ! baan#e on a #ontinuous pro#esses at
stea"y state may be (ritten as
=nput > Generation ? utput > onsumption
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+ass baan#e $or biomass
=nput > Generation ? utput > onsumption
iomass =n > iomass Gro(th ? iomass ut
Bio"ass In 5 Bio"ass 4rowth 6 Bio"ass /7uent 5 Bio"ass 3aste sluge
I0(/0T2 *A3
S/3A4/
T*/AT/D/(/0
T
3AST/DS(D4/
S(D4/*/T(*0
Aerationtank
FinalClarifer
@o
, So
, Ao
∀, S, A@o > @r
A, S @o – @(
Ae, S
@u, Au@r, Au
@(, Au
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Eq. 7.1
Bio"ass
4rowth
Bio"ass/7uent
Bio"ass3astesluge
6hereB@o,@( ? =nCuent an" (astesu"ge Co( rate,m3/"Ao, A, Ae, Au ? biomass #on#entrations in inCuent,rea#tor, eDuent an" #ari5er
un"erCo(:(aste su"ge;, respe#tivey,&g/m3
So, S ? soube $oo" #on#entration in theinCuent an" rea#tor, respe#tivey, &g/m3
∀ ? voume o$ rea#tor, m3
E s ? ha$ saturation #onstant,&g/m3
&o ? ma*imum gro(th rate #onstant, "
1
&" ? en"ogenous "e#ay rate #onstant, "1
+ass baan#e $or biomass
Bio"ass In
uwewod
s
ooo X Q X )QQ( ) X k
S K
XS k ( X Q +−=−
+∀+
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+ass baan#e $or substrate :$oo";
=nput > Generation ? utput > onsumption
oo" =n oo" onsume" ? oo" ut
oo In 8 oo +onsu"e 6 oo /7uent 5 oo 3aste Sluge
I0(/0T2 *A3
S/3A4/
T*/AT/D/(/0
T
3AST/DS(D4/
S(D4/*/T(*0
Aerationtank
FinalClarifer
@o
, So
, Ao
∀, S, A@o > @r
A, S @o – @(
Ae, S
@u, Au@r, Au
@(, Au
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+ass baan#e $or substrate :$oo";
Eq.7.2
ooIn
oo+onsu"e
oo/7uent
oo3astesluge
6hereB F ? "e#ima $ra#tion o$ $oo" mass #onverte" to biomass
? :mg/ biomass/mg/ $oo" utiiHe";
!ssumptions• 'he inCuent an" eDuent biomass #on#entrations are
negigibe #ompare" to biomass at other points in thesystem
• 'he inCuent $oo" #on#entration So is imme"iatey"iute" to the rea#tor #on#entration S be#ause o$ the#ompetemi* regime
•! rea#tions o##ur in the rea#tor. 'here$ore, thevoume, ∀ represents the voume o$ the rea#tor ony
S QS QQS K Y
SX k S Q
wwo
s
o
oo
+−=
+
∀− )()(
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F/M Ratio 0.05 – 0.15 kg
BOD/kgMLSS.day
HRT 18 – 24 o!"#SRT 20 – $0 day#
%o&!'(t"i) Loadi*g 0.1+ – 0.40 kgBOD/'$
MLSS )o*)(*t"atio* $000 – +000 'g/L
R()y)&( Ratio 0.75 – 1.50 ,i" #!--&y 0 – 125 '$/kgBOD
"('o(d
Design an 9perational
Para"eters
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*ampe
An Extended Aeration STP treats 1500 m3 osewage daily wit a !"# concentration o300 mg$%& Calc'late te (ol'me re)'ired orte aeration com*artment& +ence, ceck te
+ydra'lic -etention Time .+-T/ and te (ol'metric loading& #etermine te )'antityo sl'dge wasted *er day& Ass'me a %SSconcentration o 3500 mg$% and a Solids-etention Time .S-T/ o 5 days&
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Pro!ess -ow !hart
Aerationtank
FinalClarifer
o 1500 m3$d
So 0&3 kg
!"#$m3
4 .%SS/ 3&5kg$m3tc .S-T/ 5
d?
2w4'?
+-T?
?
∀
L∀
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So&!tio*
1. Fi*d o&!'(
Coose F$ ratio as
0&1 kg !"#$kg %SS&day
X
QS
M
F o
∀=
5.3
3.015001.0
×∀
×=
31286m=∀∴
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= 20.6 hoursOK (18 < HRT < 24)
2. Fi*d HRT
2415001286 HRT ×=
oQ )t ( HRT ∀=
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$. Fi*d o&!'(t"i) &oadi*g
= 0.35 kgBOD/m3
(OK : 0.16 < < 0.40)
∀=∀ oo
L S Q
1286
3.01500×=
L∀
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4. Fi*d q!a*tity o #&!dg( a#t(d
∴ u!"#$#% o& s'ug *!s#+ Qw X u =
= 180 kg/!%
uw X Q
X SRT
∀
=
25
5.31286×
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@uiH
1. )e5ne se#on"ary treatment
2. )e5ne a#tivate" su"ge pro#ess
3. )es#ribe the environmenta $a#tors that inCuen#e theheath an" gro(th o$ mi#roorganisms.
4. *pain ho( soi"s are generate" in an aeration basin, an"the #onseuen#es to the operation i$ e*#ess soi"s are notremove" :(aste";.
I. or ee#tive treatment, a #ertain su"ge age is "esire" $orthe type o$ a#tivate" su"ge system. or #onventiona
a#tivate" su"ge, a su"ge age o$ 41I "ays is typi#a. ore*ten"e" aeration a#tivate" su"ge, o"er su"ge ages o$2030 "ays are #ommon. Spe#i$y a reationship bet(eenthe su"ge age an" /+ ratio.
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S@%J=JG!'< -!'-S:S-;
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•
S- is a 5an""ra( a#tivate" su"ge system.• 6aste(ater is a""e" to a singe bat#h rea#tor
an" then "is#harge". uaiHation, aerationan" #ari5#ation :se"imentation; are a
a#hieve" in a singe bat#h rea#tor using a time#ontro seuen#e.
:=n a #onventiona a#tivate" su"ge system,
these unit pro#esses (ou" be a##ompishe" byusing separate tan&s;.
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S- perationphases
ill: 6aste(ater enters the
rea#tor.*ea!t: 6aste(ater isaerate". -ea#tion time"epen"s on the eDuent
uaity reuire".Settle: iomass separation$rom 5na eDuent. -ea#tora#ts i&e a se"imentationtan&.
De!ant: ina eDuent is"ra(n out o$ rea#tor eavingbehin" the sette" su"ge.Ile: 'ime bet(een
"e#anting an" 5. 'ime
)e#ant
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• 'o optimiHe the per$orman#e o$ thesystem, t(o or more bat#h rea#tors
are use" in a pre"etermine"seuen#e o$ operations.
For continuous-fow application, one tank receivesfow while the other completes its treatment cycle.
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'he #entra $eatures o$ the S- system :the hearto$ the system; in#u"e the #ontro unit an" theautomati# s(it#hes an" vaves that seuen#e an"time o$ the "ierent operations.
S- manu$a#turers shou" be #onsute" $orre#ommen"ations on tan&s an" euipment. =t istypi#a to use a #ompete S- system
re#ommen"e" an" suppie" by a singe S-manu$a#turer.
'he S- system#onsists o$ a tan&,
aeration an" mi*ingeuipment, a"e#anter, an" a#ontro system.
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aboratory s#ae S-
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!"vantages
• reuire ess spa#e sin#e euaiHation,bioogi#a treatment an"se"imentation #an be a#hieve" in a
singe rea#tor
• operating Ce*ibiity an" #ontro
• #apita #ost savings by eiminating
#ari5ers an" other euipment
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)isa"vantages
• higher eve o$ maintenan#e
• potentia "is#harging o$ sette"su"ge "uring "e#ant phase
• higher eve o$ sophisti#ation :timingunits an" automate" #ontros;
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