Updated: July 2002

1. System Outline

Dioxins is one of the most toxic chemicals known and very stable in the environment. Therefore, the removal of dioxins in river, sea and all public water bodies is very important and urgent matter.
This advanced technique, developed by Kubota Corp., can degrade dioxins in water to the detection limit using a photochemical degradation process by a combination of ozone and ultra violet (UV) light.

2. Characteristics

I. High dioxin degradation ability
UV light with ozone produces powerful photochemical degradable potential which can break down dioxins in water under 0.1 pg-TEQ/L..

II. Easy operation and maintenance
Operation and maintenance of this system are very easy. And low running cost can be achieved, because no special chemicals except for neutralizer are necessary for this system.

III. Simple unit
This system is operated under atmosphere pressure and ordinary temperature. This system can be installed to most water treatment systems, which already have a capacity of BOD/SS removal, without any extra pretreatment.

3. Performance

It has been known that dioxins in water can be degraded by ultra violet alone. However, the rate of dioxins degradation is too low for practical use. A photochemical degradation process by a combination of ozone and ultra violet light improves this problem degrading at considerably high rate. The UV light converts dissolved ozone into highly reactive hydroxyl radicals. Dioxins degradation is conducted by a combination of dechlorination by ultra violet and a fission of double bonds by hydroxyl radicals. This photochemical degradation process can degrade dioxins to carbon dioxide, water and no harmful compounds.

4. Application Fields

This system is applicable to every kind of water, which contains dioxins at a wide range of concentration, landfill leachate, pond water around dioxin emission site, waste water from scrubber, leachate from contaminated soils, groundwater and industrial effluent.

5. Achievements

This system has been already applied to the various dioxins contaminated wastewater treatment; five landfill leachate, a pond water and wastewater from gas scrubber as of Dec. 2000.

A Flow Sheet Example for Dioxins Degradation System

Dioxins Degradation System