Advanced wastewater treatment plant

Advanced wastewater treatment plant

Main purpose of advanced wastewater treatment plant

Because new specific facilities were increased by newly constructing a plant building, an advanced wastewater treatment plant was installed in addition to conventional facilities in order to meet the new effluent standard pursuant to Ibaragi Prefecture bylaws.

Application examples of process features

In this process, two environmental technologies which AION can boast are used. (1)(2)

(1)AION Microbe Carrier

AION Microbe Carrier

"AION Microbe Carrier" is used by placing them in a carrier charging tank. This product used is a 4-mm square cube, and to the inside, microbes are immobilized to reduce BOD and COD components by biological treatment. In actual performance, "AION Microbe Carrier" achieves more than 50% reduction in both BOD and COD components by the biological treatment.

Sludge dewatering machine

Sludge dewatering machine

(2)AION Precision separator of solids and liquid

[Sludge dewatering machine]

"AION Precision separator of solids and liquid" is used for treatment to draw sludge from a settling tank and dewater. This machine is a vacuum filtration type solids-liquid separator and in this process, 6 separators are installed and used for unattended operation.

(3)Advanced wastewater treatment

The system oxidation-treats and decomposes refractory ingredients by chemicals, in addition to conventional activated sludge treatment. After oxidation treatment, coagulation-thickening treatment is performed by polymer coagulants to further improve the water quality. Because components which are unable to be removed by the conventional general treatment can be treated, this process is called advanced wastewater treatment.

Process flow of advanced wastewater treatment plant

Process flow of advanced wastewater treatment plant

Sludge recycle

In wastewater treatment, what is most troublesome is treatment of sludge generated. In AION, total volume of sludge is outsourced for recycling as compost.

Sludge recycle

Discharged sludge is placed in containers and transported to a processor and composted through a fermentation process. Compost is used for soil improvement additives, afforestation materials, etc.

Effects of advanced wastewater treatment plant

The plant meets the new wastewater standard (not more than 10 ppm for both BOD and COD) of Ibaraki Prefectural bylaws associated with an increase of specific facilities, and has reduced wastewater loads of BOD, COD, and SS*3 in wastewater by half.
*3 SS: suspended solids.

ENVIRONMENT