Many industries face the necessity of having to find improved methods for treating the waste waters they discharge to sewers and water courses, in order to comply with the tightening controls being applied by the regulatory authorities. Removal of toxic organic compounds to levels measured in parts per million or lower is required in many cases.
These ultra low discharge consents, can often render conventional physio-chemical treatment processes inoperable and as such more specialist high technology treatment routes must be considered. Of particular concern are the pollutants included on the European Community’s Red List of compounds harmful to the environment, such as pesticides and polychlorinated biphenyls.
C-Tech Innovation has researched extensively into the effects of various combinations of ozone, ultraviolet light and hydrogen peroxide, with or without added catalysts, to generate highly active oxidising species which are capable of destroying a wide range of organic pollutants. Complete oxidation (or mineralisation) can be brought about, converting the pollutants into carbon dioxide, water and small amounts of mineral acids (if elements such as chloride, sulphur or nitrogen are present).
The methods have greatest potential as tertiary treatments, that is for destroying the toxic pollutants which may remain in the waste water following the removal of the bulk of the organic loading by more conventional methods such as flocculation or biological digestion.
Examples of compounds successfully treated include:-
- Polychlorinated Biphenyls