Energy From Solid and Liquid Waste

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ENERGY FROM SOLID AND LIQUID WASTE 

HIGH RATE REACTORS

by-

Roshantaara.S.B

BTE07037

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As their name implies, high-rate 

reactors, also referred to as fast

reactors ,carry material at high rateas a flowing stream. Reactants are continuously fed into

the reactor and emerge as

continuous stream of product.

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Upward-flow anaerobic sludge

blanket (UASB) reactor.Expanded granular sludge bed(EGSB) reactor.

High rate sludge reactor.

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Anaerobic granular sludge bedtechnology is a special kind of 

reactor concept for the "high rate"anaerobic treatment of wastewater. The concept was initiated with

upward-flow anaerobic sludge

blanket (UASB) reactor.A UASB reactor is at first appearance

nothing more than an empty tank.

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Wastewater is distributed into the tank atappropriately spaced inlets.

 The wastewater passes upwards throughan anaerobic sludge bed where themicroorganisms in the sludge come intocontact with wastewater-substrates.

It forms granules (pellets) of 0.5 to 2 mmdiameter that have a high sedimentation

velocity . It results in the production of gas (e.g. biogas containing CH4 and CO2).

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Distinguishing feature is that afaster rate of upward-flow velocity is

designed for the wastewater passingthrough the sludge bed. The EGSB design is appropriate for

low strength soluble wastewaters .For wastewaters that contain inert or

poorly biodegradable suspendedparticles.

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A high rate reactor for the treatment

of biosludge has been designedwhich combines the processes of land farming, sand bed dewatering,and forced aeration composting

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Volume reduction, stabilization, and

solidification are achieved atimproved. The reactor is essentially a sand bed

overlying a drainage system housed

in an inflatable, pressurized building.

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It can effectively treat biosludgethrough dewatering and

biodegradation at high rates overconventional practices. The reactor operates independent of 

climate and is a closed system

minimizing environmentalmonitoring.

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 The four top applications of high rateanaerobic reactor systems are for:

Breweries and beverage industryDistilleries and fermentation industryFood IndustryPulp and paper.

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These four industrial sectors accountfor 87% of the applications.

Also in the treatment of chemical andpetrochemical industry effluents.

 Treatment of textile industrywastewater, landfill leachates as well

as applications directed at conversionsin the sulfur cycle and removal of metals .

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