Akvopedia-spade, akvouser, bot, bureaucrat, emailconfirmed, smwadministrator, smwcurator, susana-working-group-susana-member, administrator, widget editor
697
edits
Changes
→References
sys1=[[Single Pit System |1]]|
sys2=[[Blackwater Treatment System with Infiltration|56]]|sys3=[[Blackwater Treatment System with SewerageEffluent Transport|67]]|sys4=[[Blackwater Transport to (Semi-) Centralized Treatment System |78]]|sys5=[[Sewerage System with Urine Diversion |89]]|
sys6=|
sys7=|
sys8=|
sys9=|
pic=Upflow_anaerobic_sludge_blanket_reactor1.png|
ApplHousehold=|
ManShared=|
ManPublic=XX|
Input1=Blackwater|Input2=Greywater |Input3= Brownwater | Input4= |Input5=|Output1= Effluent | Output2= Treated Sludge | Output3= Biogas | Output4= | Output5=
}}
|[[Image:Upflow_anaerobic_sludge_blanket_reactor1.png |right|500px]]
|}
<br>
----
<br>
[[Image:Icon_upflow_anaerobic_sludge_blanket_reactor.png |right|95px80px]]'''The Upflow Anaerobic Sludge Blanket Reactor (UASB) is a single tank process. Wastewater enters the reactor from the bottom, and flows upward. A suspended sludge blanket filters and treats the wastewater as the wastewater flows through it.'''
'''The upflow anaerobic sludge blanket reactor (UASB) is comprised of microbial granules, i.e. small agglomerations (0a single tank process.5 to 2mm in diameter) of microorganisms that, because of their weight, resist being washed out in Wastewater enters the upflow. The microorganisms in reactor from the sludge layer degrade organic compounds. As a resultbottom, gases (methane and carbon dioxide) are releasedflows upward. The rising bubbles mix the A suspendedsludge without the assistance of any mechanical parts. Sloped walls deflect material that reaches the top of blanket filters and treats the tank downwards. The clarified effluent is extracted from the top of the tank in an area above wastewater as the sloped wallswastewater flows through it.'''
===Design Considerations===
Critical elements for the design of UASB reactors are the influent distribution system, the gas-solids separator, and the effluent withdrawal design. The gas that rises to the top is collected in a gas collection dome and can be used as energy (biogas). An upflow velocity of 0.7 to 1 m/h must be maintained to keep the sludge blanket in suspension. Primary settling is usually not required before the UASB.
<br>
{{procontable | pro=
- High reduction in organics. <br> - Can withstand high organic loading rates (up to 10kg BOD/m3/d) and high hydraulic loading rates. <br> - Low production sludge (and thus, infrequent desludging required). <br> - Biogas can be used for energy (but usually requires scrubbing first). | con=
}}
==Adequacy=Appropriateness=== A UASB is not appropriate for small or rural communities without a constant water supply or electricity. The technology is relatively simple to design and build, but developing the granulated sludge may take several months. The UASB reactor has the potential to produce higher quality effluent than [[Septic Tank|Septic Tanks]] (S.9), and can do so in a smaller reactor volume. Although it is a well-established process for large-scale industrial wastewater treatment and high organic loading rates up to 10 kg BOD/m3/d, its application to domestic sewage is still relatively new.
===Health Aspects/Acceptance=== The UASB reactor has the potential to produce higher quality effluent than Septic Tank|septic tanks]], operators should take proper health and can do so safety measures while working in a smaller reactor volume. Although it is a wellestablished process for large-scale industrial wastewater treatment processesthe plant, its application to domestic sewage is still relatively newsuch as adequate protective clothing. Typically it is used for brewery, distillery, food processing Effluent and pulp sludge still pose a health risk and paper waste since the process can typically remove 85% to 90% of Chemical Oxygen Demand (COD). Where the influent is low strength, the reactor may should not work properly. Temperature will also affect performancebe directly handled.
==Health Aspects/Acceptance=Operation & Maintenance=== The UASB is a Centralized Treatment technology that must be operated and maintained by professionals. A skilled operator is required to monitor the reactor and repair parts, e.g., pumps, in case of problems. Desludging is infrequent and only excess sludge is removed every 2 to 3 years.
===References===* Lettinga, G., Roersma, R. and Grin, P. (1983). Anaerobic Treatment of Raw Domestic Sewage at Ambient Temperatures Using a Granular Bed UASB is a centralized treatment technology that must be operated Reactor. Biotechnology and maintained by professionalsBioengineering 25 (7): 1701-1723. As with all wastewater processes, operators should take proper health and safety measures while working in (The first paper describing the plant.process)
* LettingaVigneswaran, GS., RoersmaBalasuriya, RB. L. N. and GrinViraraghavan, PT. (19831986). [https://www.ircwash.org/sites/default/files/341.2-86AN-2504.pdf Environmental Sanitation Reviews. Anaerobic Wastewater Treatment of Raw Domestic Sewage at Ambient Temperatures Using a Granular Bed UASB Reactor Biotechnology – Attached Growth and Bioengineering 25 (7): 1701–1723Sludge Blanket Process]. Environmental Sanitation Information Center, AIT, Bangkok, TH. (The first paper describing the process.Good technical overview – Chapter 5)
