Academic journal article Journal of Environmental Health

The Performance of UASB Reactors Treating High-Strength Wastewaters

Academic journal article Journal of Environmental Health

The Performance of UASB Reactors Treating High-Strength Wastewaters

Article excerpt

* Anaerobic wastewater treatment is the biological treatment of wastewater without the use of air.

* During anaerobic treatment, the organic pollutants are converted to a gas.

* The gas contains

-- methane (C[H.sub.4]),

-- carbon dioxide (C[O.sub.2]),

-- ammonia (N[H.sub.3]), and

-- hydrogen sulfide ([H.sub.2]S).

* Anaerobic wastewater treatment has several advantages over aerobic processes:

-- since aeration is not needed, it uses less energy;

-- the organic matter in the influent is converted into a valuable gas; and

-- less surplus sludge is formed because anaerobic microorganisms have a lower growth rate.

* The most popular high-rate anaerobic reactor method is the up-flow anaerobic sludge blanket (UASB) process.

* The UASB method has been employed for the treatment of wastewaters from industrial applications such as

-- sugar,

-- food,

-- distilleries,

-- slaughterhouses,

-- dairies,

-- chemical manufacture,

-- pulp and paper,

-- petrochemicals, and

-- pharmaceuticals.

* It has also been used to treat domestic sewage.

* A UASB reactor is relatively economical and simple.

* It does not require packing material to support biomass, clarifier, or mechanical mixing. …

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