Leading ClO2 Technology Purate™ Leading ClO2 Technology

Purate™ Technology Efficient Chlorine-free Economical Easy to operate Reliable Safe Distributore esclusivo Chimica Dr. Fr. D’Agostino S.p.A. – BARI Tel. ++39 80 5058978 – Fax ++39 80 5058963 www.chimicadagostino.com

Purate™ Technology The chlorate chemistry: 2 NaClO3 + H2SO4 + H2O2 2 ClO2 + O2 + Na2SO4 + 2 H2O Chemical consumption for the production of 1.0 kg of chlorine dioxide (95% efficiency): Purate 4.2 kg Sulfuric acid (78%) 5.0 kg Distributore esclusivo Chimica Dr. Fr. D’Agostino S.p.A. – BARI Tel. ++39 80 5058978 – Fax ++39 80 5058963 www.chimicadagostino.com HGO 001005

Traditional Chlorine Dioxide Technologies Chlorite + chlorine: 2 NaClO2 + Cl2 2 ClO2 + 2 NaCl 30% overfeed by Cl2 to maintain high efficiency (>95%) Chlorite + hydrochloric acid: 5 NaClO2 + 4 HCl 4 ClO2 + 2 H2O + 5 NaCl 250% overfeed by HCl to maintain an efficiency of 85-90% Distributore esclusivo Chimica Dr. Fr. D’Agostino S.p.A. – BARI Tel. ++39 80 5058978 – Fax ++39 80 5058963 www.chimicadagostino.com HGO 001005

The SVP-Pure™ Generator Flow Scheme Distributore esclusivo Chimica Dr. Fr. D’Agostino S.p.A. – BARI Tel. ++39 80 5058978 – Fax ++39 80 5058963 www.chimicadagostino.com

SVP-Pure™ Process Description 78% Sulfuric acid and Purate™ solution (mixture of Hydrogen Peroxide and Sodium Chlorate) are fed into a tubular reactor. The exothermal reaction raises the temperature to 40ºC - 80ºC. Vacuum is created by a water loop that flows through an eductor and the formed gaseous Chlorine Dioxide is drawn out from the reactor. The Chlorine Dioxide gas immediately absorbs in the water creating a ClO2 solution. Distributore esclusivo Chimica Dr. Fr. D’Agostino S.p.A. – BARI Tel. ++39 80 5058978 – Fax ++39 80 5058963 www.chimicadagostino.com GuJ010323

SVP-Purate™ Process Easy to operate Reliable and safe PLC monitoring the process operating the machine Reliable and safe Flow alarm when motive water stops or is too low Pressure alarm when loss of vacuum in the reactor Automatic shut down at stop of motive water and loss of vacuum More than 95% Efficiency Distributore esclusivo Chimica Dr. Fr. D’Agostino S.p.A. – BARI Tel. ++39 80 5058978 – Fax ++39 80 5058963 www.chimicadagostino.com GuJ010323 GuJ010323

Purate™ Installation ~ Water line Purate™ H2SO4 Generator Station Dosage point ~ Pure water Distributore esclusivo Chimica Dr. Fr. D’Agostino S.p.A. – BARI Tel. ++39 80 5058978 – Fax ++39 80 5058963 www.chimicadagostino.com HGO 001005

Purate™ Technology Good performance proven: No THM formation High generator efficiency Lower by-products vs. chlorite based methods Better economy vs. chlorite based methods Distributore esclusivo Chimica Dr. Fr. D’Agostino S.p.A. – BARI Tel. ++39 80 5058978 – Fax ++39 80 5058963 www.chimicadagostino.com HGO 001005

The U.S. Reference situation September 2002 Distributore esclusivo Chimica Dr. Fr. D’Agostino S.p.A. – BARI Tel. ++39 80 5058978 – Fax ++39 80 5058963 www.chimicadagostino.com

Purate™ Technology Assume Production rate: 1 kg/hr ClO2 dosage: 1 mg/l Flow rate: 1000 m3/hr Purate consumption: 100 kg/day Distributore esclusivo Chimica Dr. Fr. D’Agostino S.p.A. – BARI Tel. ++39 80 5058978 – Fax ++39 80 5058963 www.chimicadagostino.com HGO 001005

SVP-Pure Process Criteria Unit location Indoor location preferred and shielded from direct sunlight Streams to / from SVP-PureTM unit Pumps Temperature: 5 - 40oC Eductor Water Pressure: 6 - 7 bar Quality: Clean, low in suspended solids Chlorine Dioxide Solution Concentration: 1500 - 2000 ppm at max production rate 100 - 150 ppm at min production rate Unit Electrical Power Requirement Supply: Voltage/Phase/Frequency: 120/1/60 or 230/1/60 Load: 20 amp Distributore esclusivo Chimica Dr. Fr. D’Agostino S.p.A. – BARI Tel. ++39 80 5058978 – Fax ++39 80 5058963 www.chimicadagostino.com GuJ010323

SVP-Pure™ Maintenance Daily Maintenance Checking for leaks Monthly Maintenance Checking chemical feed rates as well as ClO2 production rate Yearly Maintenance MRoy pumps: replace check valves, diaphragm, relief valve poppet OPTEK Analyzer: clean the cell (every three years the lamp should be changed) Non-Routine Maintenance Referring to pump and Analyzer manuals Distributore esclusivo Chimica Dr. Fr. D’Agostino S.p.A. – BARI Tel. ++39 80 5058978 – Fax ++39 80 5058963 www.chimicadagostino.com GuJ010323

Purate™ solution Chemical composition Stability and reactivity 40% NaClO3 + 8% H2O2 Stability and reactivity Strong oxidizing agent. Liberate oxygen when heated. Materials and chemicals to avoid Contaminants, like metals and organic material, may accelerate hydrogen peroxide decomposition into oxygen and cause an increase in pressure. Textile, cellulose or leather contaminated by Purate™ are inflammable. Strong acids react violently with Purate™with the formation of toxic and explosive gases. Distributore esclusivo Chimica Dr. Fr. D’Agostino S.p.A. – BARI Tel. ++39 80 5058978 – Fax ++39 80 5058963 www.chimicadagostino.com

Purate™ solution Conditions to avoid Handling Storage Heat UV-radiation Increased pH. pH > 4 may accelerate decomposition of hydrogen peroxide. Handling Personal protection equipment should be used. Avoid contact with skin, splash in the eyes and inhalation of vapor. Storage Storage in reinforced fiber glass, AISI 316 or PEHD tanks. Separated from other uncompatible chemicals. Distributore esclusivo Chimica Dr. Fr. D’Agostino S.p.A. – BARI Tel. ++39 80 5058978 – Fax ++39 80 5058963 www.chimicadagostino.com

Comparison between content of two ClO2 solutions * NaClO2 ref.:2:nd European Symposium on Chlorine Dioxide and Disinfection, Paris, 1999 June 24-25:Appl.of Chlorine dioxide for DW Disinfection at the water supply of Florence: O.Griffini et alt Distributore esclusivo Chimica Dr. Fr. D’Agostino S.p.A. – BARI Tel. ++39 80 5058978 – Fax ++39 80 5058963 www.chimicadagostino.com GuJ010323