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191:. The blanket begins to reach maturity at around three months. Small sludge granules begin to form whose surface area is covered in aggregations of bacteria. In the absence of any support matrix, the flow conditions create a selective environment in which only those microorganisms capable of attaching to each other survive and proliferate. Eventually the aggregates form into dense compact biofilms referred to as "granules".
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The blanketing of the sludge enables a dual solid and hydraulic (liquid) retention time in the digesters. Solids requiring a high degree of digestion can remain in the reactors for periods up to 90 days. Sugars dissolved in the liquid waste stream can be converted into gas quickly in the liquid phase
225:
Second generation UASB reactors, the EGSB (Expended
Granule Sludge Blanket) reactor. This is a single layer high load system, with only one settler layer. The upflow speeds are many times higher than in UASB, so that the 'adult' granules remain in the system, 'baby' granules often wash out. Typical
229:
Third generation UASB reactors, the ECSB reactor. This is a double layer high load system, with 2 settler layers. The upflow rates are high below the first settler layer, and low below the second settler layer - this keeps both the 'adult' and 'baby' grains in the system, which pays off in greater
205:
for export and to cover its own running power. The technology needs constant monitoring when put into use to ensure that the sludge blanket is maintained, and not washed out (thereby losing the effect). The heat produced as a by-product of electricity generation can be reused to heat the digestion
58:
230:
net growth of granular sludge. Typical loading rates for an ECSB; 15 - 35 kg COD / m3 / day. The ECSB is a closed system. There is no chance of corrosion or odor nuisance.
385:. 1st UK Conference and Exhibition on Biodegradable and Residual Waste Management, February 18–19, 2004, Harrogate, UK. Leeds: CalRecovery Europe Ltd. pp. 407–413.
258:
With UASB (but also EGSB and ECSB), the process of settlement and digestion occurs in one or more large tank(s). The effluent from the UASB, which has a much reduced
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Over time, the UASB model has been upgraded, pain points have been addressed, and design has been optimized - ultimately resulting in the following types of systems.
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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
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loading rates for an EGSB; 15 - 30kg COD / m3 / day. The EGSB is a largely closed system. There is no or little chance of corrosion or odor nuisance.
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Schematic of an upflow anaerobic sludge blanket reactor (UASB): Wastewater enters the reactor from the bottom and flows upward.
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Lettinga G, Rebac S, Zeeman G (September 2001). "Challenge of psychrophilic anaerobic wastewater treatment".
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UASB reactors are typically suited to dilute waste water streams (3% TSS with particle size >0.75mm).
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376:"The ArrowBio Process for Mixed Municipal Solid Waste – Responses to "Requests for Information""
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is produced as a by-product, and this may be captured and used as an energy source, to generate
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331:. Swiss Federal Institute of Aquatic Science and Technology (Eawag), Duebendorf, Switzerland.
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Bal AS, Dhagat NN (April 2001). "Upflow anaerobic sludge blanket reactor—a review".
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262:(BOD) concentration, usually needs to be treated further, for example with the
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Lettinga G (1995). "Anaerobic digestion and wastewater treatment systems".
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Compendium of
Sanitation Systems and Technologies - (2nd Revised Edition)
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Tilley, E., Ulrich, L., Lüthi, C., Reymond, Ph., Zurbrügg, C. (2014)
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144:) technology, normally referred to as UASB reactor, is a form of
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Finstein, M.S.; Zadik, Y.; Marshall, A.T.; Brody, D. (2004).
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183:. The upward flow combined with the settling action of
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381:. In Papadimitriou, E.K.; Stentiford, E.I. (eds.).
159:(methane-producing) digester that evolved from the
65:. Unsourced material may be challenged and removed.
266:, depending on the effluent quality requirements.
163:. A similar but variant technology to UASB is the
210:which can exit the system in less than a day.
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298:(combination of UASB and an anaerobic filter)
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383:Biodegradable and Residual Waste Management
74:"Upflow anaerobic sludge blanket digestion"
522:
508:
500:
307:List of waste-water treatment technologies
350:"What are sludge granules? UASB Homepage"
125:Learn how and when to remove this message
318:
243:UASB reactor shown is the larger tank.
291:Expanded granular sludge bed digestion
187:suspends the blanket with the aid of
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63:adding citations to reliable sources
911:Ultraviolet germicidal irradiation
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781:Agricultural wastewater treatment
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1024:
39:
841:Industrial wastewater treatment
811:Decentralized wastewater system
138:Upflow anaerobic sludge blanket
50:needs additional citations for
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861:Rotating biological contactor
446:10.1016/S0167-7799(01)01701-2
197:with a high concentration of
165:expanded granular sludge bed
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926:Wastewater treatment plant
693:Adsorbable organic halides
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698:Biochemical oxygen demand
260:biochemical oxygen demand
1052:Anaerobic digester types
281:Anaerobic digester types
264:activated sludge process
181:anaerobic microorganisms
886:Sewage sludge treatment
826:Fecal sludge management
786:API oil–water separator
753:Wastewater surveillance
464:Antonie van Leeuwenhoek
413:Indian J Environ Health
743:Total suspended solids
738:Total dissolved solids
703:Chemical oxygen demand
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155:The UASB reactor is a
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610:Industrial wastewater
302:Fluidized bed reactor
242:
161:anaerobic clarigester
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952:Groundwater recharge
150:wastewater treatment
59:improve this article
866:Secondary treatment
851:Membrane bioreactor
806:Constructed wetland
605:Infiltration/Inflow
276:Anaerobic digestion
171:Process description
1031:Category: Sewerage
992:Septic drain field
957:Infiltration basin
901:Stabilization pond
821:Facultative lagoon
685:Quality indicators
565:Blackwater (waste)
545:Acid mine drainage
476:10.1007/BF00872193
256:
146:anaerobic digester
33:
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1038:
816:Extended aeration
763:Treatment options
713:Oxygen saturation
560:Blackwater (coal)
538:Sources and types
434:Trends Biotechnol
337:978-3-906484-57-0
217:Historical course
167:(EGSB) digester.
148:that is used for
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16:(Redirected from
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947:Evaporation pond
935:Disposal options
906:Trickling filter
891:Sewage treatment
791:Carbon filtering
771:Activated sludge
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352:. Archived from
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286:Anaerobic filter
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982:Reclaimed water
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404:Further reading
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590:Cooling water
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585:Cooling tower
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550:Ballast water
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440:(9): 363–70.
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356:on 2006-07-17
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175:UASB uses an
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115:November 2020
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76: –
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70:Find sources:
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48:This article
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37:
36:
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19:
1012:Vacuum sewer
915:
896:Sewer mining
846:Ion exchange
796:Chlorination
718:Heavy metals
675:Urban runoff
615:Ion exchange
595:Fecal sludge
467:
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369:
358:. Retrieved
354:the original
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157:methanogenic
154:
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57:Please help
52:verification
49:
1002:Storm drain
997:Sewage farm
921:Vermifilter
876:Septic tank
836:Imhoff tank
733:Temperature
640:Return flow
630:Papermaking
470:(1): 3–28.
419:(2): 1–82.
203:electricity
189:flocculants
1057:Sanitation
1046:Categories
967:Irrigation
831:Filtration
531:Wastewater
360:2006-08-24
313:References
85:newspapers
801:Clarifier
748:Turbidity
600:Greywater
177:anaerobic
728:Salinity
620:Leachate
555:Bathroom
454:11514000
425:12397675
270:See also
249:Tel Aviv
655:Septage
492:9415571
484:7741528
458:Review.
206:tanks.
199:methane
185:gravity
99:scholar
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670:Toilet
660:Sewage
625:Manure
490:
482:
452:
423:
389:
335:
253:Israel
245:Hiriya
235:Design
195:Biogas
101:
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87:
80:
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575:Brine
488:S2CID
379:(PDF)
106:JSTOR
92:books
916:UASB
480:PMID
450:PMID
421:PMID
387:ISBN
333:ISBN
142:UASB
78:news
18:UASB
472:doi
442:doi
61:by
1048::
723:pH
486:.
478:.
468:67
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438:19
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251:,
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523:e
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103:·
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