March 31, 2008

Degrémont Technologies-Ozonia empowers Ozone Generator Systems by combining the IGS (Intelligent Gap System) and MODIPAC™ technologies

March 31, 2008. Dübendorf - Switzerland

Degrémont Technologies-Ozonia combines the IGS (Intelligent Gap System) Dielectric Technology and the MODIPAC™ - Modular Power Supply Unit - to deliver the state-of-the-art Ozone Generation System: cost effective, powerful and environmentally friendly.

Over the last 30 years, ozone has been considered a suitable chemical for oxidation processes such as pulp bleaching in the paper industry, municipal drinking water treatment or wastewater treatment and as an alternative of conventional chemicals such as chlorine, chlorine dioxide, hydrogen peroxide and peracetic acid.

With a substantial reduction of electrical energy consumption and an ozone concentration rate up to 14% by weight (broad range from 6 to 14 wt%), the combination of the IGS (Intelligent Gap System) Dielectric Technology and MODIPAC™ (Modular Power Supply Unit) improves the efficiency of ozone generation and is perfectly suited for larger installations found in industry, eg pulp bleaching, municipal and wastewater treatment works:

These innovations, in conjunction with Degrémont Technologies-Ozonia’s standard practices, resulted in major advantages for operators for all types of oxidation processes.

Today, Ozone gained its "Label of Nobleness", not only from the vastly reduced electrical energy consumption, improved reliability and availability, but also from the recognition as a highly technically efficient and environmentally friendly chemical for pulp bleaching, water treatments, etc.

IGS (Intelligent Gap System) Dielectric technology for ozone generators

An ozone generator is basically a machine, which transforms electrical energy into chemical energy. The key element of this physical transformation process is the ozone generator made-up from a number of dielectric elements centred in water cooled earth electrodes. In the small gap between the dielectric and the earth electrode, a controlled electrical discharge transforms a portion of the oxygen in the feed gas (either dry and clean oxygen or air) into ozone.

Main improvements:

The segmentation of dielectrics and variable discharge gap are patented key features of the innovative Degrémont Technologies-Ozonia’s IGS (Intelligent Gap System). The result is a substantial reduction of electrical energy consumption and improvement of many other operating parameters.

MODIPAC™ state-of-the-art modular power supply units

The MODIPAC™ (Modular Power Supply Unit) technology is the latest generation of power supply units for Degrémont Technologies-Ozonia’s ozone generators. The main feature of this PSU design is an innovative frequency converter using state-of-the-art Insulated Gate Bipolar Transistors (IGBT). The development of the "Insulated Gate Bipolar Transistors" (IGBT) was a major step forward in semiconductor power technology, which was clearly destined to replace existing technologies such as thyristors and similar components for a vast majority of applications. In order to keep abreast with technological development, Degrémont Technologies-Ozonia embarked on a development program, which has resulted in the top-of-the-line MODIPAC™ modular power supply units which are now used exclusively by Degrémont Technologies-Ozonia for their extensive range of ozone generators.

Main MODIPAC™ features:

Essentially, the MODIPAC™ PSU converts the 3-phase 400/480 VAC, 50/60 Hz mains voltage into a single phase supply at a frequency of 1450 Hz. In simplistic terms, the unit can be divided into two parts: the front-end which rectifies the incoming mains voltage into DC and the inverter part which converts the DC into the frequency required by the ozone generator. Following the MODIPAC™ unit, this single phase medium frequency supply is transformed with a high voltage transformer to the operating voltage level.

The MODIPAC™ is built in standardised 250 kW modules which can be connected together to meet any size of ozone generator or ozone production rate.

After the high voltage transformer, the supply is fed to the fused dielectric elements in the ozone generator and a silent discharge is formed in the gap between the earthed steel pipes in the vessel and the dielectrics. When feed gas, either dry and clean air or oxygen, is passed through this gap, a portion of the oxygen molecules are converted into ozone. The ozone concentration and ozone production rate can be regulated by adjusting the power density and/or the feed gas flow rate.

About Degrémont Technologies-Ozonia

The IGS (Intelligent Gap System) Dielectric technology and MODIPAC™ product have been developed by Degrémont Technologies-Ozonia (SUEZ), one of the world’s leading suppliers of UV and ozone disinfection - oxidation systems. Degrémont Technologies-Ozonia (SUEZ) has a long history and extensive experience in both product lines and supplies ozone and UV equipment to the industrial and municipal sectors.

The disinfection of water and wastewater and associated technologies are a global requirement of this day and age. In order to meet market demands, Degrémont Technologies-Ozonia (SUEZ) has established representatives in most countries around the world, each of which offers the same core technologies and provides customers with all necessary support services.

As a recognised leader in disinfection - oxidation solutions, Degrémont Technologies-Ozonia (SUEZ) designs and manufactures a wide range of ozone and UV products which incorporate some of the most sophisticated electronics available. These systems are designed for a wide range of applications in the industrial and municipal markets and have unique technical features to simplify installation, reduce operator attention and to ensure minimum maintenance.

Degrémont Technologies (SUEZ) is the worldwide dedicated equipment branch of Degrémont (SUEZ) which is the water treatment specialist within SUEZ Environment. With business in over 70 countries and almost 4,700 staff, Degrémont (SUEZ) generated sales of EUR 978 million in 2007.

SUEZ Environment, a branch of the SUEZ Group, supplies services, plant and equipment essential to life and to environmental protection: drinking water production and distribution, wastewater collection and treatment, waste processing and recycling. Backed by its experience in the water and waste sectors, SUEZ Environment has a wide-ranging portfolio of know-how, providing sustainable solutions for local authorities and businesses. SUEZ Environment employs over 60,000 people worldwide and generated EUR 12 billion in sales in 2007.

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Jacqueline Chavannaz

Tel : +41 44 801 8523