Feature Summary

Type of Process: Biological treatment of liquid hazardous wastewaters.

Type of Reactor: Sequencing Batch Reactor (SBR), a fill-and-draw, activated sludge-type system where aeration and settling occur in the same tank.

Type of Aeration and Mixing Systems: Jet-aeration systems are common and allow mixing either with or without aeration; however, other aeration and mixing systems are used.

Type of Decanters: Most decanters, including some which are patented, float or otherwise maintain inlet orifices slightly below the water surface to avoid removal of both settled and floating solids.

Type of Tanks: Steel tanks, appropriately coated for corrosion control, are most common; however, concrete and other materials may be used. Concrete tanks are favored for municipal treatment of domestic wastewaters.

Partial List of Suppliers of SBR Equipment: Aqua-Aerobics Systems; Austgen-Biojet; Bioclear Technology; Envirodyne Systems; Fluidyne; Jet Tech; Mass Transfer; Purestream; Transenviro

The Sequencing Batch Reactor (SBR) is a periodically operated, activated sludge-type, dispersed-growth, biological wastewater treatment system. Both biological reactions and solids separation are accomplished in a single reactor, but at different times during a cyclic operation. In comparison, continuous flow activated sludge systems use two reactors, one dedicated to biological reactions and the other dedicated to solids separation. Once constructed, these two-tank systems offer little flexibility because changing reactor size is difficult. However, the SBR is flexible, as the time dedicated to each function can be adjusted. For example, reducing the time dedicated to solids separation provides additional time for the completion of biological reactions. Other advantages of the SBR system are described below, along with a description of the SBR operating cycle. The SBR originally was developed to treat domestic wastewater and is now used to effectively treat industrial and other organic wastewaters containing hazardous substances.

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