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
Know what you’ll get, before it’s built
When you buy a car, you can see it in the showroom before you buy it. When it arrives, it is exactly as you had envisioned and there are no (nasty) surprises. With Dioxide Pacific, it’s the same with everything we build. It may be a standard product like our Electricide® chlorine/chlorine dioxide generators or a bespoke chemical dosing skid. Either way, we always produce a 3D model of the system using Autodesk Inventor, which becomes the template for our staff to build the item. Generally, we don’t produce 2D fabrication drawings as we find the 3D model is easier and more accurate to build from. When you order a system, you’ll be provided with the 3D model and the ability to view the model from different angles; parts transparent or hidden and measurement tools. You can ask for changes to be made at that time until you are happy with the layout. The built system will be exactly the same as the 3D model you have approved. It will fit in the space you have allocated and connect to services exactly as promised.
Dioxide Pacific recently designed and built a chemical dosing skid for sodium hypochlorite for an odour scrubber. The dosing skid is a powder coated stainless steel frame with Fiberstrut base, HDPE sides and a polycarbonate splash screen. Metering pumps ProMinent Sigma/3. All accessories including actuated ball valves, mag flow meter, pressure gauge and pulsaton dampener are fixed to the HDPE back using Fiberstrut bolts and pipe clamps.
The 3D model was developed from the P&ID and approved by the customer prior to fabrication.
When complete, the skid was tested at our works and delivered to site. Time frame from approval of the 3D model to delivery was 4 weeks. This short time frame was critical to the customer.
Interested to know more or obtain a quotation?
Dioxide Pacific can provide design drawings and manufacture storage, transfer and dosing systems for just about any chemical you can name. We’ve been doing this successfully for more than 17 years. Looking for a quality outcome – we won’t let you down.
Download the chemical dosing systems brochure
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Safety is always a concern to plant managers
Recently, we received an inquiry from a customer indirectly servicing the food industry. Their water is used for washing and must be clean and disinfected. They were looking for a disinfection method that would minimize their safety risk on site. Filtration+UV was chosen as the primary method although they realized it would not be sufficient on it’s own as the reticulation pipework would require a chemical residual of either chlorine (hypochlorite) to prevent biofilm growth.
This is how the customer perceived the various alternatives:
The Electricide® HGB chlorine generator is an electrochemical system for converting sodium chloride (salt) into chlorine. Electricide-B1 is a purified brine precursor that is fed into the HGB generator at the anode side of the electrolytic cell where chloride ion is oxidised to chlorine. Chlorine combines with the hydroxide formed at the cathode to make sodium hypochlorite solution at 5-25 g/L (as NaOCl). The generator is skid mount and easy to install on site. Electricide-B1 chemical is available ex stock from Dioxide Pacific.
Chlorine Generation Reactions:
① Anode (oxidation): 2Cl– → Cl2 + 2e–
② Cathode (reduction): 2H2O + 2e– → H2 + 2OH–
① + ② (combined) 2Cl– + 2H2O → Cl2 + H2 + 2OH–
Chlorine reacts with caustic catholyte to form sodium hypochlorite and salt.
Cl2 + 2NaOH → NaCl + NaOCl
What is good about it?
- Safety. Only one precursor chemical is required – Electricide-B1 and this is non-hazardous. The hypochlorite solution produced is 5-25 g/L at pH 9 – 9.5. This compares with commercial bleach at 12.5% (125 g/L) at pH 12. The lower concentration hypochlorite is much safer to handle and store.
- Stability. The lower concentration hypochlorite produced by the HGB generator is 25 times more stable in storage than commercial bleach. Longer life means lower cost.
- Purity. The hypochlorite solution produced by the HGB generator is extremely low in chlorate, sodium and chloride. This can be important for food production where low chlorate and perchlorate in the food product are important.
- Simplicity. The generator is simple to operate, install and maintain.
- Remote access. Web server access using any browser is standard with email alarms.
- Reliability. The generator membrane cell is guaranteed when Electricide-B1 is used as the precursor.
The Electricide® HGB generators are available for purchase or rental. Rental can include maintenance.
Electricide-B1 chemical is available in IBC’s (totes), 200L (55 gal) or 15L (5 gal) drums.
Dioxide Pacific can install and commission the system if desired. Installation is a simple process for mechanical and electrical technicians.
Download the Brochure
Contact us for more information or a quotation.
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
Fiberstrut vinylester channel, fasteners and brackets are ideal for construction of chemical dosing skid frames where 100% chemical resistance is desired. For chemicals like sodium hypochlorite, hydrochloric acid, sulphuric acid, fluorosilicic acid (FSA) ferric chloride and chlorine gas, dosing skids have traditionally been constructed from gal steel or stainless steel and subsequently epoxy painted. Of course, the painted steel looks good for the first few weeks. Eventually, the base metal corrodes either from a chemical spill or from chemical fumes. The result is an ugly plant room, costly removal of equipment and replacement of channel and fixings some months down the track.
typical corrosion of steel channel in a sodium hypochlorite environment
Typical corrosion of stainless steel pump stand from sodium hypochlorite
One of our customers recently provided chemical dosing skids for a water authority to replace existing skids that had corroded and failed. They chose to use Fiberstrut channel to mount dosing boards to the wall and for fabrication of pump stands. The stands were assembled from cut pieces of Fiberstrut vinylester channel, angle brackets, bolts, nuts and post bases. One key feature is chemical resistance. The dosing pumps will require maintenance and when disconnected, some chemical may drip onto the pump stands. If this happens, the chemical can be washed off and no corrosion will occur.
Fiberstrut vinylester fabricated dosing pump stand
Fiberstrut vinylester fabricated pump stand complete with PVC top, non-metallic nuts and bolts
Dioxide Pacific stocks a comprehensive range of Fiberstrut channel and components. Please download the Catalog.
It may be worth considering the use of Fiberstrut for your next chemical dosing installation. Please contact us and we will send you a price list.
Dioxide Pacific has supplied Electricide electrochemical chlorine dioxide systems for CIP sanitization in food and beverage applications with great results. In many cases, chlorine dioxide has replaced peracetic acid mixes. Typically, chlorine dioxide is applied at 1-3 ppm and can be dosed into the sanitisation rinse (flow paced) or made up as a 1-3 ppm solution (PID controlled) and pumped to through the system. Peracetic acid is typically used at 50-100 ppm.
One such food ingredient producer has been using the Electricide CDE10 generator for 3 years. They were using peracetic acid dosed from a tote (IBC) using a metering pump and paying $80k per year for chemicals. During connection of a tote, an operator came into contact with the chemical. Peracetic acid has a pungent vinegar smell which aggravates eyes and burns the skin (peroxide ingredient). Management decided to look around for an alternative and decided chlorine dioxide should be trialed. After 3 months of successful operation, the system was purchased and installed. Current yearly running costs are around $10k and the capital purchase was paid back in less than 1 year. The customer is happy with the improved safety aspects of chlorine dioxide as Electricide-P1 (the chlorine dioxide precursor) has no vapor and is easy to connect to the Electricide generator. Chlorine dioxide solution at 2,000 ppm is pumped to a CIP make-up tank where 3 ppm solution is made-up and controlled. The 2,000 ppm solution is safe to pump through UPVC pipe and the 3 ppm solution has no corrosion issues in stainless steel tanks and pipework. One benefit of the Electricide electrochemically generated chlorine dioxide is the purity of the solution produced – no chloride and close to neutral pH. Other methods of chlorine dioxide generation produce chlorine dioxide with low pH and high chloride which increase the risk of stainless steel corrosion.
Chlorine dioxide can be used as a final rinse as it will not react to form any odor or taint producing by-products in food and beverage products. This aspect will save a lot of water and energy. Usually, peracetic acid requires a lot of water as a post-rinse to remove the chemical. Chlorine dioxide does not require this post-rinse.
If you have a CIP sanitization application and would like to do the numbers on chlorine dioxide, contact Dioxide Pacific. Take a look at the features of the Electricide generator.