Waste Treatment and Metal Recovery
A significant challenge in developing cleaner, more efficient, more profitable processes is the separation of waste streams, either for further processing or for recovery of valuable portions of the waste. C-Tech Innovation has a range of electrochemical and electrothermal solutions for waste processing, including pre-treatment of organic waste, recovery of valuable metals, and electrodialytic separation of unwanted materials.
The removal of heavy metals from waste streams has typically involved precipitation of the metal as an insoluble metal hydroxide sludge, which then needs to be filtered, dried and dumped. Some metals, for example hexavalent chromium, cannot be treated this way and need to be chemical treated with materials such as bisulphate ion. The costs associated with such treatments have risen rapidly. Now more than ever, technologies are being sought which can remove metals from waste streams at source, reduce waste volumes and, in some cases, recover and recycle the metals.
Calling on over 30 years of experience in electrochemical process design, C-Tech Innovation has developed highly cost effective systems that offer an improvement over conventional metal wastewater treatment methods.
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.
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).