Treatment of micro-pollutants, residual colour, disinfection - Ozono
The use of ozone produced from pure oxygen for treating and eliminating micro-pollutants in wastewater, for example surfactants, nonbiodegradable COD, residual colour or for final disinfection, is a technology that often has to be applied in wastewater treatment plants normally as a tertiary stage and also in certain situations before the biological stage, in particular to increase the BOD/COD ratio of the water to be treated.
Ozone is a strongly oxidising gas produced from oxygen by using electrical energy, it is an un-stable molecule that tends to decompose spontaneously re-forming oxygen (half life at 20°C: about 30 minutes), and so cannot be stored but needs to be produced directly on site.
The most modern ozone production technologies make possible degrees of conversion of the pure oxygen used as raw material of more than 16% and usage efficiency close to 100%: in particular the production of ozone from pure oxygen considerably limits both the investment costs and the electrical consumption of the ozone production system compared with air fed systems. The specific characteristics of the oxygen supplied by SOL also make it possible to prolong the working life of the plant thanks to the very low content of humidity which, if present in potentially uncontrolled quantities, for example when using compressed air, can lead to frequent breakdowns.
Using Ecojet® technology it is also possible to reuse, for example in the water purifying plant, the oxygen released from the plant after the dissolution and use of the ozone: this means further savings and an increase in the overall efficiency of the treatment.