The three reactions
- Ozone breakdown with UV-C light: UV-C breaks ozone (O₃) into oxygen molecules and highly reactive oxygen atoms, which attack pollutants.
- Creation of hydroxyl radicals (•OH): the oxygen atoms react with water to form hydroxyl radicals, among the most effective agents for breaking down organic contaminants.
- Direct ozone oxidation: ozone also oxidizes contaminants directly, enhanced by UV-C, breaking them down into safer by-products.
What it is designed to achieve
- Neutralization and inactivation of pathogens and microorganisms
- Reduction of chemicals and the COD level
- Improved biodegradability of effluent before the treatment plant
How a TRESA TL cycle runs
Effluent fills a primary tank; the ozone generator starts and the wastewater is pumped into a reaction tank with ozone through a venturi cone. It then circulates in a closed loop through the UV-C lamps while ozone is injected. At the end of the set cycle, an active-carbon filter captures residual dissolved ozone and the treated effluent is discharged to the main sewer, subject to local requirements.
Which compounds it addresses
Organic compounds react with ozone in a process similar to combustion, producing mainly carbon dioxide and water. Many acids, alcohols, aldehydes, ketones, aromatic, aliphatic, chlorinated compounds and compounds containing nitrogen or sulfur can be oxidized; the full list is on the TRESA TL page. Wastewater tests are performed before and after installation to verify the results.
Installation needs
TRESA TL treats up to 1,500 L per day and needs a closed, ventilated room of at least 10 m², a 230 V supply and, optionally, access to city water.