upflow anaerobic sludge blanket digestion
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Upflow anaerobic sludge blanket digestionFrom Wikipedia, the free encyclopedia
Schematic of an upflow anaerobic sludge blanket reactor (UASB) Wastewater enters the reactor from the bottom and
flows upward !"#$
Upflow anaerobic sludge blanket (UASB ) technology, normally referred to as UASB reactor, is a formof anaerobic digester that is used for wastewater treatment !
%he UASB reactor is a methanogenic (methane&producing) digester that e'ol'ed from the anaerobic
clarigester ! A similar but 'ariant technology to UASB is the e panded granular sludge bed ( *SB )digester!
UASB uses an anaerobic process whilst forming a blanket of granular sludge which suspends in the tank!Wastewater flows upwards through the blanket and is processed (degraded) by the anaerobicmicroorganisms ! %he upward flow combined with the settling action of gra'ity suspends the blanket withthe aid of flocculants ! %he blanket begins to reach maturity at around three months! Small sludge granules
begin to form whose surface area is co'ered in aggregations of bacteria! +n the absence of any supportmatri , the flow conditions create a selecti'e en'ironment in which only those microorganisms capable ofattaching to each other sur'i'e and proliferate! 'entually the aggregates form into dense compact biofilmsreferred to as granules ! "-$
Biogas with a high concentration of methane is produced as a by&product, and this may be captured and
used as an energy source, to generate electricity for e port and to co'er its own running power! %hetechnology needs constant monitoring when put into use to ensure that the sludge blanket is maintained,and not washed out (thereby losing the effect)! %he heat produced as a by&product of electricity generationcan be reused to heat the digestion tanks!
%he blanketing of the sludge enables a dual solid and hydraulic (li.uid) retention time in the digesters!Solids re.uiring a high degree of digestion can remain in the reactors for periods up to /0 days! "1$ Sugarsdissol'ed in the li.uid waste stream can be con'erted into gas .uickly in the li.uid phase which can e itthe system in less than a day!
UASB reactors are typically suited to dilute waste water streams (12 %SS with particle si3e 40!56mm)!
Contents
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• -See also
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Design [edit ]
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UASB reactor shown is the larger tank! :iriya , %el A'i' , +srael
With UASB, the process of settlement and digestion occurs in one or more large tank(s)! %he effluent fromthe UASB, which has a much reduced B;7 concentration, usually needs to be treated further, for e amplewith the acti'ated sludge process , depending on the effluent .uality re.uirements!
See also [edit ]
Sustainable development portal
• Anaerobic digestion
• Anaerobic digester types
• Anaerobic clarigester
• Anaerobic filter
•
panded granular sludge bed digestion
• :ybrid reactor (combination of UASB and an anaerobic filter (AF))
• Fluidi3ed bed reactor
External links [edit ]
• Bal AS, Dhagat NN (April 2001). "Upflow anaerobic sl !ge blan et reactor# a re$iew". %n!ian & 'n$iron ealth 43 (2) 1*+2. -%D 12 / .
•
3ettinga 4, 5ebac S, 6ee7an 4 (Septe7ber 2001). "8hallenge of ps9chrophilic anaerobic wastewater treat7ent" . :ren!s Biotechnol. 19 (/)* 0. !oi 10.101 ;S01 < //(01)01 01<2 . -%D 11 1=000 . re'iew
• 3ettinga 4 (1// ). "Anaerobic !igestion an! wastewater treat7ent s9ste7s". Antonie >an 3ee wenhoe 67 (1) * 2+. !oi 10.100 ;B?00+ 21/ . -%D =1 2+.
References [edit ]
#! Jump up ̂ %illey, !, Ulrich, <!, <=thi, >!, 9eymond, ?h!, @urbr=gg, >!(-0#8) 8o7pen!i 7 of Sanitation S9ste7s an! :echnologies < (2n!
5e$ise! '!ition) ! Swiss Federal +nstitute of A.uatic Science and%echnology ( awag), 7uebendorf, Swit3erland! +SB /5 &1&/0C8 8&65&0!
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-! Jump up ̂ What are sludge granulesD UASB :omepage
1! Jump up ̂ ?instein, -.S., 6a!i , @., -arshall, A.:., Bro!9, D.(200=). ":he ArrowBio rocess for -i e! - nicipal Soli! aste *
5esponses to "5eC ests for %nfor7ation"" ( D?) . %n apa!i7itrio , '. .,Stentifor!, '.%. Bio!egra!able an! 5esi! al aste -anage7ent. 1st U
8onference an! ' hibition on Bio!egra!able an! 5esi! al aste -anage7ent, ?ebr ar9 1+*1/, 200=, arrogate, U . 3ee!s8al5eco$er9 ' rope 3t!. pp. =0 *=1 . %SBN 0</ == 0+<1<+.
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<eachate
anure
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Wastewater quality indicators Biochemical o ygen demand>hemical o ygen demand
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>oliform inde
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p:
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Wastewater treatment options
Acti'ated sludge
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arine dumping
arine outfall
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