Carrier Feed Type Reaction Tank Facilities
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.
Miyakonojo Wastewater Treatment Center, Miyakonojo City
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 conventional activated sludge process requires.
The Bio-Tube has been in operation for 24 consecutive years without refilling (as of Jan 2020).
Iriezaki Wastewater Treatment Center (new west area), Kawasaki City
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 hours, and considerably reduce the treatment time and required space.
Energy-saving Bio-Tube system
The system design takes into account the ability of nitrifying bacteria grown and detached from carriers, and nitrification and denitrification are performed in the same tank, enabling operation without circulating nitrifying solution and with reduced aeration airflow, resulting in a significant reduction in power consumption.