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Electricide CDE Electrochemical Chlorine Dioxide Systems
 

The Electricide CDE series electro-chemical chlorine dioxide generators are ideal for disinfection applications in the potable water, food and beverage industries. Why?

Purity. The chlorine dioxide produced by the CDE generators is 99.5% pure. Chlorine dioxide is produced in an electro-chemical cell from the oxidation of chlorite ion. The chlorine dioxide solution is then recirculated through our VClone gas extraction unit to remove chlorine dioxide gas in pure form. The chlorine dioxide has is then dissolved into dilution water to produce a solution of 2,000 - 3,000 ppm. As pure chlorine dioxide gas is used to make the chlorine dioxide solution, there can be no other impurities or reaction by-products present. This method is totally different to other generation systems where chlorite or chlorine is always present in the chlorine dioxide solution.
If you are going to disinfect water and use it for human consumption, it would seem logical to choose the method of disinfection which has the highest purity and lowest risk to human health. Chlorine dioxide generated by our CDE generator is what you are looking for.

Reaction by-products from the presence of chlorine such as Trihalomethanes (THM’s), HAA’s, chloramines and chlorophenols will not be formed with the CDE series chlorine dioxide generators. So, the water you use for drinking, process or product contact will be of the highest quality.

Safety. Acid-chlorite (2-chemical) generators use hydrochloric acid and sodium chlorite as reactant. These two chemicals react together inside a reaction chamber to form chlorine dioxide at high strength (2%). It is clear that these two chemicals are incompatible as they react to form chlorine dioxide. This is fine as long as the reaction occurs safely, there are no leaks and the chemicals are stored correctly. However, there is an inherent risk associated with the handling of two incompatible chemicals. There is always the possibility (however small) that an operator could spill one chemical into the other outside the generator and form chlorine dioxide, which is dangerous outside the generator reaction chamber. Also, during chemical fill, tanks and fill lines can get mixed up. Handling acid is always a problem as it fumes and is nasty to work with. We have seen many sites where acid is stored and the sheds are corroded from the acid fumes. With acid, chlorite, hypochlorite (3-chemical) generators, the chemical handling scenario is even more complex as 3 chemical must be handled by an operator. With the Electricide CDE generator, the chemical handling risks are removed as there is only one chemical and no acid.

Neutral pH
The Electricide CDE generator produces a chlorine dioxide solution which is neutral in pH. The solution will be the same pH as the water you are using in your process. This aspect is very important for recirculating (closed or semi-closed) water circuits such as cooling towers and wash circuits. It desirable to not alter the pH of the water you are treating by the addition of chlorine dioxide. For acid-chlorite generators, there is always > 250% molar excess of acid present in the chlorine dioxide added. This means that the alkalinity and therefore the pH of the treated water will continually decrease with the addition of chlorine dioxide from these generators. In recirculating water circuits, this is a problem as pH must then be corrected by addition of caustic. The reduction of alkalinity is a problem for corrosion as stainless steel is susceptible to pitting corrosion by chlorides at low pH. Acid-chlorite generators also add chloride with acid continually to the water. The Electricide CDE generator adds no acid and does not reduce alkalinity so the corrosion risk associated with the CDE generator is far lower. Also, pH correction with caustic is not requried.

Mulitple Point Dosing from One Generator
Multiple point dosing using an acid-chlorite generator is difficult as a dilution tank with level sensors etc needs to be added to the basic generator. The Electricide CDE generator is designed for multiple point dosing and only requires the addition of one dosing pump per dosing point. The system has a cetral touchscreen controller which provides an interface for control of each dosing point via flow, residual or combined flow/residual.

Remote Access
The Electricide CDE generator can be accessed remotely via the internet. This aspect is very useful for remote sites and where chlorine dioxide addition to an application is very critical. Our service tech’s can get on-line and investigate problems, start and stop the unit and get the unit running quickly without having to attend site. A wired connection to the unit is not required.
 

Typical Applications
 

 

Application: Chlorine Dioxide disinfection of process water for contact with food products.
Raw water is pumped from the local river into a 1ML underground storage dam. This water is continually circulated with a small centrifugal pump. Chlorine dioxide solution is generated and dosed into this recirculation line on the basis of the chlorine dioxide setpoint of 0.40 ppm. Chlorine dioxide residual is measured using a chlorine dioxide transmitter and an amperometric probe. Using PID control and the make-up water flow signal, a PID control output is calculated which is provided as a 4-20mA signal to a chlorine dioxide dosing pump.

The chlorine dioxide generator is located inside a plant room with IBC storage of chemical inside a fibreglass IBC bund. Chemical flows under gravity to the generator. 20% caustic is produced as a free by-product and this is collected in a 500L HDPE tank from which it is pumped to a bulk storage tank for re-use.

The complete system is controlled with a PLC and touchscreen which interfaces with the site SCADA system.

electrochemical chlorine dioxide generator

Chlorine Dioxide disinfection of poultry processing chiller water and process water.
Chilled water at around 4 deg.C is used inside a spin chiller for processing poultry carcasses. The carcasses enter the chilled water and spend time in this water as the temperature of the carcass decreases. In order to inactivate E.Coli, Salmonella and other micro-organisms, chlorine dioxide is dosed into the chiller water to maintain a concentration of 5 ppm. It is not possible to measure chlorine dioxide in this environment with an amperometric probe as the blood, fat and other organics would foul the membrane cap and cause overdosing. Redox (ORP) is the preferred method where 650 mV equates to 5 ppm.

Chlorine Dioxide is dosed into chiller water using three dosing pumps. The dosing pumps each have proportional control loops from redox transmitters, providing 4-20mA control signals to the dosing pumps.

The customer has reported an increase of shelf life of 7-10 days since chlorine dioxide use started. Prior to chlorine dioxide, sodium hypochlorite dosing was used and this was controlled manually to 30 ppm.

Chlorine dioxide is also dosed into process water at 0.40 ppm. This disinfected water is used generally throughout the site for washing.
 

Chlorine Dioxide sanitisation of UF, NF and RO membranes
Chlorine Dioxide can be dosed continuously at 1 ppm to prevent biological fouling with UF, NF and RO Membranes. Alternatively, chlorine dioxide can be dosed intermittently during programmed cleaning cycles. The advantage of chlorine dioxide in this application is that oxidative damage to the membranes is prevented and excellent disinfection is obtained with the benefit of very low running cost. Chlorine dioxide is present in  the concentrate and permeate streams.

Tests have been done with many of the major membrane brands to confirm compatibility with chlorine dioxide. Please contact us for further detailed information.
 

    Other Applications:

  • Disinfection of chilled water for elimination of Listeria and E.Coli for vegetable processing water.
  • CIP sanitisation for beverage processing. Replacement of peracetic acid.
  • Potable water disinfection - THM reduction, Cryptosporidium inactivation.
  • Plant nursery recycled irrigation water - disinfestation of plant pathogens.
  • Disinfection of lettuce wash water - Listeria inactivation.
  • Disinfection of Legionella in recirculating warm water systems or cooling towers.
  • Disinfection of cooling tower water in the presence of ammonia.
  • Disinfection of once through sea water cooling circuits for macro and micro fouling control.

For more information on electrochemical chlorine dioxide dosing systems, download the brochure, or to obtain a quotation, please complete the feedback form on our Contact page.

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