For waste waters with a special constitution we apply Photo-Fenton-type reactions to achieve the best overall performance. Our specially designed process combines a low chemical consumption with a high degradation rate.
The advantages of the Photo-Fenton compared to the Fenton process are significantly lower operating costs, the absence of the filter press(es) and a much higher degradation rate of the Photo-Fento oxidation compared to the Fenton oxidation. Furthermore, the Photo-Fenton process can be largely automatic, unlike a Fenton process, which will always remain highly manual, as even an "automatic" filter press always requires a lot of manual intervention - the difference between theory and practice. Furthermore, a Fenton plant is getting silted up over time and maintenance is increasing significantly to keep it operational.
Wherever recalcitrant organic systems and even aromatic structures are present, photo-Fenton has gigantic advantages, since photo-oxidation quickly and effectively breaks down organic compounds and makes them more readily accessible to further oxidation.
Table: Comparison of Fenton and Foto-Fenton
Fe(2+)+H2O2 --> Fe(3+) + 1 OH-Radical + 1 OH-
Partially organic is sorbed on the FeOOH sludge (separate disposal)
H2O2 + UV --> 2 OH-Radicals
Further degradation reactions due to photolysis
|Formation of reactive species||1 radical per H2O2|
Double H2O2 consumption in comparison to UV / H2O2 (at the same degree of degradation)
2 radicals per H2O2
Usually limited to max. 65%,
Generally not limited by the chemsitry of the oxidation process, but in some cases extreme degradation rates not economic
Formation of sludge
|Typically sligtly higher CAPEX|
Automatic Fenton is not simple to realize, especially automatic sludge separation and handling
Foto-Fenton is easy to automate