The CDEB-2.5 chlorine dioxide generator produces both ClO2 solution and gas
Commercial production of medical cannabis (marijuana) is allowed in many countries and some US States. The plants are often grown in large greenhouses, requiring treatment systems for water and air.
Three risks are managed:
Air can contain powdery mildew spores which damages final product for the growing operation
Chlorine dioxide destroys powdery mildew spores. This produces a quantifiable $$ saving for the operation, to justify its use. Chlorine dioxide gas is extracted from the CDEB generator and dosed into ducts feeding air to various locations in the greenhouses. Through a proprietary method, the concentration of ClO2 is maintained within the optimal band between underdosing (no effect) and overdosing (phytotoxicity – damage to plants).
Result: Cannabis powdery mildew control.
Air exhausted from the greenhouse contains odors which require treatment
Greenhouses can be located near residential developments and odorous air may cause complaints. Chlorine dioxide oxidises organic isoprene odors at low concentration. Odor control is a side-benefit of powdery mildew control.
Result: Odor reduction to acceptable standards.
Irrigation water can grow biofilm and block drippers
Chlorine dioxide is excellent for biofilm control at low residual. Chlorine dioxide solution at 2,000 ppm (2 g/L) is produced in the generator and stored in a small batch tank. This solution is dosed by metering pumps into the water reticulation pipework. Control is by automatic flow pacing.
Result: Excellent biofilm control.
Other options they considered:
- Manual preparation of ClO2. There are methods for preparation of ClO2 where two precursor chemicals are mixed in a tank by hand. This is dangerous as operators are exposed to ClO2 gas at the preparation tank. ClO2 gas is not directly available with this method
The Electricide® CDE generators are available for purchase or rental, direct or through our distributors.
In most cases, you can install and commission the generator with remote assistance (web or phone). Dioxide Pacific can install and commission the system if desired. Installation is a simple process for mechanical and electrical technicians.
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Who certified the generators?
Truesdail Laboratories Inc. (now part of ALS Global) has certified the generators.
View our certification here.
Which models are certified?
The following Electricide® electrochemical chlorine dioxide generators models to NSF/ANSI 61 & 372:
- CDEB-2.5 Capacity: 47 g/hr = 2.5 lb/day
- CDE-10 Capacity: 189 g/hr = 10 lb/day
Which applications require certification?
Applications related to municipal potable water and health care water treatment (hot and cold water systems in hospitals and aged care facilities) require NSF/ANSI 61 & 372 certification for chemical generators. Dioxide Pacific has obtained this certification to ensure the above-mentioned generators can be installed and operated in these applications.
What is NSF/ANSI 61 & 372?
The aim of NSF/ANSI 61 is to ensure that the generator does not add any undesired health related compounds to the water via the chemical it generates. NSF/ANSI 372 ensures that no lead is added to the generated ClO2 solution.
Note: NSF/ANSI 61 addresses health effects only and does not address the disinfection efficacy of the product
Why is it important?
Many States in the US require NSF/ANSI 61 & 372 certification for chlorine dioxide generators. Even if it is not peremptory, this certification is reciprocal in other countries as recognition of high chemical generation purity and therefore lowest risk for potable water and water for use as an ingredient in food products or for washing.
How do the generators work?
The Electricide® electrochemical chlorine dioxide generators produce 2,000 ppm chlorine dioxide solution which can be dosed and controlled to 3 dosing points. The generator PLC/HMI automatically measures ClO2 residual and controls dosing of ClO2 solution to ensure accurate disinfection. Generators are equipped with secure remote access capability to view, operate and receive email alarm notification.
Contact us for further information and pricing.
The Dioxide Pacific Electricide® CDE, CDEB, HG and HGB Chlorine Dioxide and Chlorine Generators are now CE Marked. This marking ensures their suitability for sale and operation in Europe.
We are looking forward to expanding our customer and distributor base throughout Europe for many and varied applications related to water disinfection and treatment.
Interested? Contact Us
Background – Chlorine Dioxide Disinfection
Dioxide Pacific recently provided an Electricide CDE-25 (472 g/hr – 25 pounds per day) electrochemical chlorine dioxide generator and dosing system to replace a traditional 2-chemical generator utilising 33% HCL and 25% sodium chlorite. This Australian dairy processor treats four water streams from the one generator including mains water and condensate.
The 2-chemical generator had ongoing reliability issues, plant room corrosion from HCL fumes and reduction in water alkalinity (pH). After an extensive evaluation process by an external consultant, the Dioxide Pacific Electricide electrochemical generator was chosen as the preferred replacement.
The pertintent advantages of the Electricide generator are:
- Use of only one precursor chemical
- No acid – existing acid storage can be removed
- Lower reduction in alkalinity (reduction in caustic use for pH correction)
- Higher purity chlorine dioxide – no sodium, chlorite, chloride, chlorate added from the generator
- Production of consistent 2,000 ppm ClO2 solution for dosing
- Remote access via web server
In this system, chlorine dioxide solution at 2,000 ppm is produced in the generator solution tank and transferred via level control to a 1,500L FRP external storage tank. Four metering pumps dose from the outlet of this external tank to the four dosing points. Dosing is controlled from the generator HMI/PLC using different modes. There are three water storage tanks which are circulated. Each of the three tanks is controlled to a set ClO2 residual using PID control. One tank (mains water) also has flow paced dosing. Water entering the tank is dosed via flow pacing and the mains water in the tank is dosed to a PID setpoint. The combination of flow paced and PID provides accurate residual control.
Dioxide Pacific provided the complete system including generator, metering pumps, residual analyzers, chemical transfer system and storage tanks. Metering pumps with isolation valves, load valves, pressure relief valves and gauges were assembled on a skid. Analyzers and probe holders were mounted on a backboard. Electricide-P1 chemical is provided by Dioxide Pacific in IBC’s (totes). This chemical is formulated to provide chlorine dioxide conversion and long life for the electrolytic cell. The system was installed inside a purpose built shed by the customer.
Does this sound like something you could use?
Chlorine dioxide is ideal for disinfection of water used in food & beverage processing. You may be using chlorine or a 2-chemical chlorine dioxide generator for your water disinfection. If this information has piqued your interest, contact us for more information or a quotation.
Dioxide Pacific CDE-25 electrochemical chlorine dioxide generator. Generation of chlorine dioxide solution from single precursor chemical: Electricide-P1.
Electricide chlorine dioxide generator, dosing system and residual analyzers
Chlorine dioxide solution dosing skid