Updated: July 2002

1. Overview

Special Measures Law for Dioxin Control implemented on January 15, 2000, provides the environmental and effluent quality standards for dioxins in wastewater.
As a result, effective systems are now needed that can reliably decompose dioxins, which are hard-to-decompose substances.
Conventionally, hard-to-decompose substances have been decomposed through a single process using ozone or UV ray. However, dioxins cannot be decomposed with such a single process.
Our new system is designed to decompose hard-to-decompose dioxins by combining ozone and UV processes to allow highly reactive hydroxyradicals to occur.

2. Advantages

1) Separate ozone tower and UV tower
An ozone tower and a UV tower are installed independently. This configuration results in a higher ozone mobilization ratio, leading to a lower ozone consumption.
2) UV tower of unique structure
Our propriety UV tower design (patent pending) very efficiently directs UV rays to wastewater to effectively decompose the dioxins in wastewater.
3) High dioxin decomposition ratio
Optimal ozone injection in conjunction with highly-efficient UV irradiation helps achieve a higher decomposition ratio.
4) Lower plant investment and running cost
A lower ozone consumption leads to a lower plant investment and running cost.
5) Good work environment
No hazardous chemicals are used. Ozone being consumed is converted into oxygen (a typical non-hazardous substance).

3. Performance

The performance of the system is summarized below referring to an installed system.
Performance table

4. Applications and Substances Being Treated

Dioxins have been detected on facilities that are not covered in Special Measures Law for Dioxin Control. Therefore, the redefinition of facilities being controlled has been in progress.
Our unique dioxin decomposing system can be applied in a wide range of industrial fields:
1) Wastewater disposal

(1) Seeping water from final waste disposal site
(2) Scrubber wastewater from incinerator gas scrubber or wastewater from wet dust collector
(3) Foul water or wastewater from incinerating facility and ash storage facility

(4) Wastewater from intermediate waste processing facility

2) Production processes that are associated with chlorinated organic compounds

(1) Effluent from ethylene dichloride rinsing facility
(2) Wastewater from agricultural chemicals production line
(3) Effluent from plastic production plant and processing facility