Seven Hills International Limited

Elimination of Dyes



UV PowerPlus– Elimination of Dyes in Anodizing Process


Seven Hills – UV Powerplus- UV Oxidation systems are best in class Advanced Oxidation Process systems in the market.

Colouring of alumina is a standard process in anodizing.

Applications are tending towards increasingly vibrant and colourful shades, especially in facade engineering.

Environmentally speaking, these dyes are a problem, because increasingly stable and resistant structures and formulas are being developed.

In this case, the UV PowerPlus UV oxidation offers the perfect solution. The chromophoric structures are destroyed quickly and with a low energy demand and the dyes are eliminated from rinsing water and/or waste water. Nearly all cases offer the possibility to recover the leached water for the rinsing process. Thus, the profitability of the production process will be improved significantly.

Bleaching of colored Process Water





UV PowerPlus– Treatment of Crack Detection Waste Water


Waste water from crack-detection testing does not only contain strong dyes which can be detected even in traces, but also test oils based on hydrocarbons.

Therefore, these waste waters need to be treated. According to recent law, these oils have to be bioavailable, and this leads to big problems with standard technologies like activated carbon or membrane filtration by biofouling.

UV PowerPlus process does not only eliminate the dyes, but also destroys the COD, hence leaving a simple waste water, free of contaminations such as hydrocarbons.




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