Case Study: Ozone Generators | Como, Italy

The Lariana Depur wastewater treatment plant in Fino Mornasco, Italy, treats wastewater from multiple textile manufacturers in the Como region, known as the heart of the textile industry. Since 1994, ozone has been used to remove the dark blue-purple color — the result of the dyes used in the textile dyeing and printing process — from the water.

Because the aging ozone system used an old technology that made finding spare parts difficult and costly to acquire, Lariana Depur put out a bid for a modern ozone system that would be cost-effective and meet new discharge standards.

De Nora supplied Lariana Depur with a completely upgraded ozone system. This new installation optimized the plant for lower specific energy consumption (SEC) and less costly spare parts, a result of innovative technologies, including De Nora’s proprietary dielectric design. 

The new ozone system, installed in early 2018, consists of two Capital Controls^® DTPF 182XTL-O ozone generators with a liquid oxygen feed system, De Nora ozone destruct units, De Nora power supply units, and redesigned De Nora porous diffusers system to optimize ozone transfer efficiency. Each ozone generator is designed for a maximum capacity of 1,322 lb/day.

In addition to removing color from the wastewater, the new system is now addressing additional treatment needs, including chemical oxygen demand (COD) for sludge reduction, surfactants, and disinfection before discharge into the Como River; and all at significantly lower energy usage. Later this year, Lariana Depur also plans to work with De Nora to study the use of ozone to reduce contaminants of emerging concern.

Source: DNWT – Case Study: Capital Controls^® Ozone Generators – Como, Italy, 7/2018