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Carrier Feed Type Reaction Tank Facilities

Bio-Tube System

Recently, a great deal of attention has been drawn to problems with the eutrophication of closed water areas and water pollution of public water areas. Needs for advanced treatment of sewage are growing as a solution to these problems. In response to these demands, JFE Engineering developed the “Bio-Tube” through its “Bio-focus WT” Project and provides new wastewater treatment systems using the “Bio-Tube.” This technology, which uses microorganism immobilizing carriers, helps to immobilize microorganisms in high concentrations and achieves advanced sewage treatment that ensures high efficiency, cost reduction, and space saving.

▲Carriers before immobilization

▲Carriers after immobilization

▲Scanning electron micrograph of immobilized microorganisms

Example application

Miyakonojo wastewater treatment, Miyakonojo

This center uses equipment consisting of a carrier feeding type aeration tank and an upflow filter basin and is capable of removing both BOD and SS at a very high rate. Its retention time is reduced to almost half of what the standard activated sludge process requires.
The Bio-Tube has been in operation for 16 consecutive years without reloading (as of May 2012).

Iriezaki Wastewater Treatment Center (new west area), Kawasaki

The system operating in the Iriezaki Wastewater Treatment Center is designed to remove BOD, nitrogen, and phosphorous by feeding a “Bio-Tube” into an aerobic tank for an anaerobic-anoxic-aerobic process.
Using the “Bio-Tube” makes it possible to remove nitrogen and phosphorous in a retention time of only 9.5 hrs., and considerably reduce the treatment time and required space.