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An introduction to electrolytic chlorination systems
28/01/2020

If you need chlorine but you don't want to handle or store hazardous chemicals on-site, electrolytic chlorination systems are a good option.

Rather than storing traditional chlorine donor chemicals such as sodium or calcium hypochlorite, you can use electricity, salt and water to generate your own sodium hypochlorite, safely, on-demand. You may hear this technology commonly referred to as electrochlorination, chlorine electrolysis or in-situ chlorine generation.

Using an automated system, a brine & water solution is prepared and passed through an anode/cathode electrode chamber, known as an electrolyser, where a low voltage direct current is passed through the solution, generating sodium hypochlorite and a small amount of hydrogen gas. The hydrogen by-product is diluted with a large volume of air in an enclosed ventilation system and is discharged safely to atmosphere.

The freshly generated solution is transferred to a day-tank and can then immediately be used and dosed via chemical dosing pumps to treat drinking water, wastewater or pool water.

Safe and easy

On-site hypochlorite generation is safe and easy, using just salt and water and energy as its raw ingredients. The resulting generated hypochlorite solution contains less than 1% chlorine, which is below the hazardous threshold, so there are big health & safety and COSHH management benefits in using this method.

The main raw material, salt, is a common commodity item which is easy to acquire and competitively priced from numerous suppliers. In the UK and Europe there are abundant sources of high-quality salt, so the electrochlorination method can have a much reduced impact on the environment compared to using calcium hypochlorite, for example, which is usually imported from East Asia or North/South America.

Salt is of course easy and very safe to store, has an infinite shelf life, and generates very little packaging waste/recycling in comparison to using commercially available hypochlorites. For example, users of calcium hypochlorite products supplied in plastic drums can reduce their plastic waste by over 90% by switching over to electrochlorination. Because the generated solution contains less than 1% chlorine, you don't need to conduct COSHH chemical safety audits or have a hazardous chemical storage area for the product. Also, as personnel are not required to handle or transfer chemicals the use of personal protective equipment is much reduced.

As a further important safety benefit, the generated liquid product is clear, free of sediment and non-scale forming, meaning that chemical injection points do not require any regular cleaning or maintenance by personnel; a task often considered to be a high-risk activity.

Massive scalability

The scalability of electrolytic chlorination systems is huge, with the ability to generate enough hypochlorite to treat millions of litres of drinking water or wastewater per day, large water parks with multiple swimming pools, and down to much smaller chlorine demand requirements such as private water supplies, secondary disinfection systems in commercial buildings, commercial spa pools and cattle farm feed-water systems.

Hyprolyser® electrochlorination systems in particular offer a good choice of different output capacities and system flexibility so that, whether you are a large or small user of chlorine, you can get a Hyprolyser® system perfectly sized for your needs.

Benefits of Hyprolyser® electrolytic chlorination systems

There's a long list of benefits of electrolytic chlorination systems, including:

  • Models approved under Regulation 31 of the Water Supply (Water Quality) Regulations 2000 for use in UK public water supplies.
  • Ease of installation.
  • Easy availability of raw materials/ security of supply.
  • Low environmental impact.
  • No hazardous chemical risks.
  • Excellent reliability and minimal maintenance demands.
  • Ease of use for operators of hotels, hospital and school swimming pools.
  • Sustainability credentials including minimal packaging waste.

More and more organisations are enjoying the benefits of electrolytic chlorination systems to supply their disinfection requirements, safely, on demand and at reduced operating costs.

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