UASB

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UASB or Upflow Anaerobic Sludge Blanket technology, normally referred to as UASB Reactor, is used in the treatment of wastewater. A similar but variant technology is expanded granular sludge bed (EGSB) digesters.

UASB uses an anaerobic process whilst forming a blanket of granular sludge and suspended in the tank. Wastewater flows upwards through the blanket and is processed by the anaerobic microorganisms. The upward flow combined with the settling action of gravity suspends the blanket with the aid of flocculants. 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 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 tanks.

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 which can exit the system in less than a day.

UASB reactors are typically suited to dilute waste water streams (3% TSS with particle size >0.75mm).

Environmental science
Environmental technology
Energy conservation Renewable energy Remediation Solid waste treatment Waste water treatment Water purification Waste management

External links

[Application of UASB for solid wastes]
[Anaerobic Granular Sludge Bed Technology Pages] - a site about anaerobic bioreactor systems for wastewater treatment and sustainable environmental technology.
[Upflow anaerobic sludge blanket reactor--a review.] - (highly technical)

Sustainability and energy development [Edit]
Energy production	Active solar \| Anaerobic digestion \| Biomass \| Blue energy \| Deep lake water cooling \| Distributed generation \| Electricity generation \| Energy tower \| Fuel cell \| Fusion power \| Geothermal power \| Hydroelectricity \| Mechanical biological treatment \| Ocean thermal energy conversion \| Passive solar \| Seasonal thermal store \| Solar cell \| Solar panel \| Solar pond \| Solar power \| Solar power tower \| Solar thermal energy \| Solar tracker \| Solar updraft tower \| Tidal power \| Trombe wall \| Water turbine \| Wave power \| Wind farm \| Wind power \| Wind turbine
Energy development and use	Energy development > Environmental concerns with electricity generation \| Future energy development \| Inertial fusion power plant \| Hydrogen economy \| Hubbert peak \| Renewable energy \| Hypermodernity \| Technological singularity
Energy and sustainability status	Ecosystem services > Kardashev scale \| TPE \| UN Human Development Index \| Value of Earth \| Appropriate technology \| Infrastructural capital
Sustainability	Autonomous building > Ecoforestry \| Ecological economics \| Earth sheltering \| Development economics \| Environmental design \| Exploitation of natural resources \| Green building \| Green chemistry \| Green gross domestic product \| Natural building \| Permaculture \| Self-sufficiency \| Straw-bale construction \| Sustainability \| Sustainable agriculture \| Sustainable design \| Sustainable development \| Sustainable industries \| Sustainable living \| The Natural Step \| Windcatcher
Sustainability management	Commission on Sustainable Development > Human development theory \| Maldevelopment \| Rio Declaration on Environment and Development \| Rocky Mountain Institute \| Sim Van der Ryn \| Underdevelopment \| World Business Council for Sustainable Development \| World Summit on Sustainable Development \| Precautionary principle \| Intermediate Technology Development Group
Energy and conservation	Energy conservation > Energy-efficient landscaping \| Passive house \| Superinsulation \| Voluntary simplicity \| Ecological footprint \| Ecovillage \| Waste \| Zero energy building
Transportation	Battery electric vehicle > Electric vehicle \| Hydrogen car \| Trolleybus
Communication	Wireless Mesh

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UASB

See also

External links