Electrochemical Chlorine Generator

Why handle and store hazardous liquified gas chlorine or bleach when a safer, cleaner and purer alternative exists!
Take a closer look at the Electricide® electrochemical chlorine generator.

The Electricide® electrochemical chlorine generator is safe and operator friendly, producing pure chlorine gas or the purest possible sodium hypochlorite solution. One non-hazardous precursor chemical is used: Granular salt or purified brine (solution of salt) Electricide-B1. Electrolytic generation of chlorine is a very low running cost method, due to the high efficiency of chlorine generation in the electrolytic membrane cell.

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The Electricide® chlorine generator can replace gas chlorine storage for potable and process water disinfection. Does the safety risk of storing liquified chlorine gas in 70kg cylinder or 920kg drums concern you? The Electricide® chlorine generator removes this risk, by generating chlorine on-site and on-demand. Chlorine is not stored, but is an intermediate product: generated then immediately dosed. The only chemical stored is the precursor. The generator can be configured to use either granular salt (NaCl) or a purified brine solution: Electricide-B1. Both precursor forms are easy to transport, store and handle with no safety risks. No connection of cylinders or drums by operators. No unloading of cylinders or drums from trucks.

For replacement of existing gas chlorination systems, the existing booster pump, eductor and chlorine leak detector can be reused, reducing the retrofit cost.

Many sites are managing frequent deliveries of bleach (commercial sodium hypochlorite) from tankers into bulk storage tanks. There are safety risks associated with unloading, storage and dosing of this chemical. Commercial sodium hypochlorite (12.5%) undergoes degradation to oxygen and chlorate with the speed of degradation related to temperature, pH, concentration and impurities.  In the graph below, the yellow line is degradation of 12.5% sodium hypochlorite and the blue line is degradation of electrolytically generated 30 g/L sodium hypochlorite. 12.5% sodium hypochlorite is reduced to half its original concentration in 20 days, whereas the 30 g/L solution has virtuall zero degradation in 90 days.

decomposition of bleach sodium hypochlorite

Typical 12.5% (125 g/L) sodium hypochlorite comes immediately from the manufacturer with 1.5 g/L chlorate ion present.

The Electricide® chlorine generator produce sodium hypochlorite solution at 2-30 g/L, pH 10 and low in sodium, chloride and chlorate. It is lower in sodium and chloride than other electrochlorinators because chlorine gas is generated, extracted with air, redissolved into caustic catholyte and is very stable in storage.

Some of our customers are located in remote areas where sodium hypochlorite is expensive to purchase or deliveries are unreliable. The bleach supplier will often require large bulk tanks to be installed to ensure low frequency of deliveries. This is a problem because bleach degrades in storage and at the middle-end of the tank volume, hypochlorite concentration is low and chlorate concentration is high. The Electricide® generator is a flexible source of sodium hypochlorite as it makes the chemical, fresh, as required.

For sites that have an existing bulk tank for 12.5% sodium hypochlorite, the Electricide® generator can be installed to top up this tank and therefore, tanker deliveries will cease.

Chlorine Generation Reactions:

① Anode (oxidation): 2Cl → Cl2 + 2e

② Cathode (reduction): 2H2O + 2e → H2 + 2OH

① + ② (combined) 2Cl + 2H2O → Cl2 + H2 + 2OH

 

In the Electricide® HG Generator, chlorine gas reacts with caustic catholyte to form sodium hypochlorite and salt.

Cl2 + 2NaOH → NaCl + NaOCl

The key benefits of the Electricide® generator are the use of only one precursor chemical, highest safety and lowest running cost. Another important feature is remote internet access for validation and troubleshooting. For a full list of features and benefits, download the HG Electrochemical Chlorine Generator Brochure pdf-icon-aa-30x30

Dioxide Pacific offers the the Electricide® generator as a complete package including granular salt or purified brine: Electricide-B1 precursor and maintenance. Remote internet access enables viewing of generator operation at any time and from any location via an internet browser – to just check the system is operating correctly, make an adjustment to a setpoint or reset an alarm. PLC or HMI program changes can be made without having to attend site. Remote internet access adds up to lower maintenance costs for you. Why send a technician to site when there is no need for it! Dioxide Pacific provides a huge library of “how to” technical and training video resources for your use, all accessible from our website. For instance, we have videos for: “how do I test the performance of the electrolytic cell”; “how do I test chlorine dioxide strength”; “how do I replace a metering pump”. In most cases, you can safely perform maintenance on the generator without involving our technicians. If you would prefer Dioxide Pacific to handle some or all of the maintenance, of course we can provide technicians for this.

How is chemical supplied?

Granular salt comes in 20 kg = 50 lb bags. Purified brine: Electricide-B1 can be supplied in drums or IBC’s (totes). Granular salt and Electricide-B1 are not hazardous chemicals and specialised spill containment is not required.

Dioxide Pacific offers turnkey systems including design drawings (P&ID, 3D model and GA), installation (mechanical and electrical) and commissioning. Our quality project management system ensures the plant will be installed on time with the smallest possible interruption to your site. We have proven risk management protocols written specifically for chlorine dioxide systems to ensure that installation, commissioning, training and operation of the plant is extremely safe.

Electricide® Chlorine systems can be installed in dedicated plant rooms, skids for transportation to remote sites or in portable buildings.

The use of chlorine gas or sodium hypochlorite from the Electricide® generator is limitless. However, typical applications include the following:

  • Top-up chlorination for potable water. These sites are typically small and handle small volumes of commercial bleach (12% sodium hypochlorite). With this method, concentration of chlorate in the hypochlorite is high and operators must lift drums. The Electricide generator removes these safety risks. Granular salt and Electricide-B1 are non-hazardous and low concentration hypochlorite is generated on-demand, being slow to degrade and very low in chlorate.
  • Replacement of liquified chlorine gas storage for potable water disinfection.
  • Disinfection of potable water for healthcare facilities
  • Truck wash water.
  • Waste water disinfection.
  • Vegetable and fruit washing.
  • Beverage industry process water disinfection.
  • Food industry process water disinfection.
  • Water used in swimming pools.

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