Colour Removal

Removing Colour from Wastewater

Colour contamination in wastewater has serious environmental consequences which can directly impact your business.

Not only are organisations under pressure to meet strict discharge or trade effluent regulations with the fear of incurring heavy fines. In recent years, much more focus has also been placed upon the sustainability of manufacturing processes with water pollution and scarcity being at the forefront.

Consumers are now choosing to spend their money with organisations that have sustainable and environmentally considerate operations.

Manufacturing facilities that have failed to treat contaminated discoloured wastewater have been subject to negative press which has caused reputational damage, impacting upon customer loyalty. From a different viewpoint, drinking water supplied by local utilities is also directly impacted by colour as consumers demand an aesthetically pleasing clear supply at all times.

Employing water treatment methods which effectively remove colour from water and wastewater, can not only help to avoid fines, but can also save money by allowing wastewater to be reused during manufacturing processes.

What causes coloured water?

Colour in water can be caused by a number of natural dissolved organics including humic and fulvic acids, natural tannins along with synthetic chemical dyes.

In order for the affected water supply to be acceptable for consumers and industrial processes, the colour must be removed.

The presence of colour in wastewater can be caused by various manufacturing processes. Not only can colour affect the aesthetic value of water, if coloured wastewater is discharged to nature, photosynthesis activity is limited which is proven to cause detrimental effects on aquatic ecosystems.

Due to this risk, standards measured in Hazen Units (HU) or Platinum Cobalt Units (PCU) provide guidance on the safe level of colour in discharged waters. By implementing an advanced onsite treatment process to remove hard-to-treat dyes and colour causing chemicals, you will avoid regulatory fines and reputational damage.

Businesses that use water in their manufacturing processes have a responsibility to ensure that any water discharged into the environment or local sewer has been treated and meets discharge regulations or directives.

How to remove colour from water

Coloured wastewater is extremely variable in composition due to the amount of dyes or chemicals used in processing and can have a complex structure which is resilient to light, biological or UV treatments.

Arvia’s onsite Nyex™ systems preferentially remove even the most persistent colour using advanced oxidation.

Various industries can benefit from the low maintenance treatment system including utilities for the treatment of source water streams which can contain colour-causing natural organic matter. As well as wastewater streams from pulp and paper manufacture, food and drink processing and textile production.

The systems are carefully designed by our industry experts and can be applied as a standalone treatment process or retrofitted into an existing treatment train to remove the most persistent of colour as a final treatment step.

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If you’d like to find out what’s in your wastewater, send us a sample and we’ll let you know how we can help.

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What’s in your wastewater?
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