Drinking Water

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Waste Water Treatment with Ozone

In some instances, you may be faced with treating ‘difficult’ liquid wastes containing hard COD, AOX (Adsorbable Organic Halides), pesticides, colour and odour. Air Products has developed it’s CHEMOXâ„¢ ozone technology for the treatment of such contaminants and by utilising a unique, patented reactor design, the CHEMOXâ„¢ solution is an extremely cost effective approach to dealing with difficult contaminants. CHEMOXâ„¢ can be used either as pre-treatment prior to a biological process or as polishing after a biological process.

Improving biological treatment through toxicity removal
Improving metal precipitation by metal oxidation
Improving biodegradability by converting hard COD to BOD
Achieving discharge limits by eliminating recalcitrant COD,
colour, halogenated organics and red list substances

Carbon dioxide
Carbon dioxide is a colourless, odourless, non-flammable and slightly acid gas. It is produced by different processes in the petrochemical industry, or by natural gas combustion in cogeneration plants.

The main water treatment applications with CO2 are recarbonation and pH control. With the recarbonation process, the principal objective is to increase the hardness of potable water arising from a reverse osmosis process, maintaining the equilibrium between carbonate, bicarbonate and free carbon dioxide.

With pH control, the carbon dioxide acts as a mineral acid substitute for reducing the alkaline water pH, in accordance with the environmental rules. Carbon dioxide is less prone to overdosing than sulphuric and other mineral acids, and is safer to handle on site.

These applications are very interesting for all industrial sectors which have these needs. Air Products has important references in the food, petrochemical, textile, soap and pulp & paper industries, and in the public segment, drinking water and wastewater treatment plants.