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180:. 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".
198:
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
214:
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
218:
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
194:
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
219:
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.
374:. 1st UK Conference and Exhibition on Biodegradable and Residual Waste Management, February 18–19, 2004, Harrogate, UK. Leeds: CalRecovery Europe Ltd. pp. 407–413.
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247:
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
210:
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.
168:
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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66:
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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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365:"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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320:. 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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251:(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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191:
955:
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519:
464:
177:
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314:
Tilley, E., Ulrich, L., Lüthi, C., Reymond, Ph., Zurbrügg, C. (2014)
29:
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133:) 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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172:. The upward flow combined with the settling action of
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370:. In Papadimitriou, E.K.; Stentiford, E.I. (eds.).
148:(methane-producing) digester that evolved from the
54:. Unsourced material may be challenged and removed.
255:, depending on the effluent quality requirements.
152:. A similar but variant technology to UASB is the
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199:which can exit the system in less than a day.
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287:(combination of UASB and an anaerobic filter)
372:Biodegradable and Residual Waste Management
63:"Upflow anaerobic sludge blanket digestion"
511:
497:
450:
296:List of waste-water treatment technologies
399:
339:"What are sludge granules? UASB Homepage"
114:Learn how and when to remove this message
227:
15:
232:UASB reactor shown is the larger tank.
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280:Expanded granular sludge bed digestion
159:
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176:suspends the blanket with the aid of
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52:adding citations to reliable sources
23:
13:
900:Ultraviolet germicidal irradiation
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14:
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770:Agricultural wastewater treatment
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28:
830:Industrial wastewater treatment
800:Decentralized wastewater system
127:Upflow anaerobic sludge blanket
39:needs additional citations for
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356:
331:
308:
1:
850:Rotating biological contactor
435:10.1016/S0167-7799(01)01701-2
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186:with a high concentration of
154:expanded granular sludge bed
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10:
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915:Wastewater treatment plant
682:Adsorbable organic halides
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923:
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687:Biochemical oxygen demand
672:
526:
249:biochemical oxygen demand
223:
1041:Anaerobic digester types
270:Anaerobic digester types
253:activated sludge process
170:anaerobic microorganisms
875:Sewage sludge treatment
815:Fecal sludge management
775:API oil–water separator
742:Wastewater surveillance
453:Antonie van Leeuwenhoek
402:Indian J Environ Health
732:Total suspended solids
727:Total dissolved solids
692:Chemical oxygen demand
244:
144:The UASB reactor is a
21:
599:Industrial wastewater
291:Fluidized bed reactor
231:
150:anaerobic clarigester
19:
941:Groundwater recharge
139:wastewater treatment
48:improve this article
855:Secondary treatment
840:Membrane bioreactor
795:Constructed wetland
594:Infiltration/Inflow
265:Anaerobic digestion
160:Process description
1020:Category: Sewerage
981:Septic drain field
946:Infiltration basin
890:Stabilization pond
810:Facultative lagoon
674:Quality indicators
554:Blackwater (waste)
534:Acid mine drainage
465:10.1007/BF00872193
245:
135:anaerobic digester
22:
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805:Extended aeration
752:Treatment options
702:Oxygen saturation
549:Blackwater (coal)
527:Sources and types
423:Trends Biotechnol
326:978-3-906484-57-0
206:Historical course
156:(EGSB) digester.
137:that is used for
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123:
116:
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936:Evaporation pond
924:Disposal options
895:Trickling filter
880:Sewage treatment
780:Carbon filtering
760:Activated sludge
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341:. Archived from
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275:Anaerobic filter
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393:Further reading
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860:Sedimentation
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579:Cooling water
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429:(9): 363–70.
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381:0-9544708-1-8
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345:on 2006-07-17
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164:UASB uses an
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104:November 2020
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65: –
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59:Find sources:
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49:
43:
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37:This article
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31:
26:
25:
18:
1001:Vacuum sewer
904:
885:Sewer mining
835:Ion exchange
785:Chlorination
707:Heavy metals
664:Urban runoff
604:Ion exchange
584:Fecal sludge
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452:
426:
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371:
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347:. Retrieved
343:the original
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146:methanogenic
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46:Please help
41:verification
38:
991:Storm drain
986:Sewage farm
910:Vermifilter
865:Septic tank
825:Imhoff tank
722:Temperature
629:Return flow
619:Papermaking
459:(1): 3–28.
408:(2): 1–82.
192:electricity
178:flocculants
1046:Sanitation
1035:Categories
956:Irrigation
820:Filtration
520:Wastewater
349:2006-08-24
302:References
74:newspapers
790:Clarifier
737:Turbidity
589:Greywater
166:anaerobic
717:Salinity
609:Leachate
544:Bathroom
443:11514000
414:12397675
259:See also
238:Tel Aviv
644:Septage
481:9415571
473:7741528
447:Review.
195:tanks.
188:methane
174:gravity
88:scholar
1018:
659:Toilet
649:Sewage
614:Manure
479:
471:
441:
412:
378:
324:
242:Israel
234:Hiriya
224:Design
184:Biogas
90:
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76:
69:
61:
564:Brine
477:S2CID
368:(PDF)
95:JSTOR
81:books
905:UASB
469:PMID
439:PMID
410:PMID
376:ISBN
322:ISBN
131:UASB
67:news
461:doi
431:doi
50:by
1037::
712:pH
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457:67
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