Chlorine Dioxide by ph Water Technologies

Today, applications for Chlorine Dioxide are as diverse as the destruction of hydrogen sulphide in gas pipelines, through to the purification of water in commercial buildings, critical care areas in hospitals, food processing plants and industrial cooling water systems.

Whatever the size or complexity of your application, PH Water Technologies has a Chlorine Dioxide system to suit – ranging from small borehole treatment systems, through to custom engineered generation systems used in data centres and industrial iron and manganese precipitation applications.

Our range of generators undertake proportional dosing of ClO2 using an inline water meter to signal the controller and dose two precursor chemicals simultaneously into a reaction chamber which holds the chemicals for a period of no less than 14 minutes. The pre cursors react within the chamber and >90% active ClO2 is dosed into the water supply.

For additional safety our units incorporate a ClO2 Gas escape alarm which will automatically shut off the dosing plant. When linked to the Red LED flashing beacon for installation outside ClO2 generator rooms it can notify personnel that PPE is to be worn prior to entering the room.

Remote Data Collection

By incorporating remote data collection technology we can provide off site data logging via a ‘Cloud Connect’ portal. By using water monitoring technology you can ensure that those responsible for maintaining a system can identify a problem and remediate before it becomes more serious & significantly reduce maintenance costs.

  • Automatically visualize your data in charts, spreadsheets and dashboards
  • Automatically receive email alerts when your system is or soon will be non-compliant
  • Check your system operation 24 hours a day from anywhere in the world via your smart phone or lap top.

Whatever the application PH Water Technologies are sure to deliver effective Chlorine Dioxide dosing and control for your peace of mind.

What is Chlorine Dioxide? 

Chlorine dioxide is an oxidising biocide/disinfectant that when used correctly, has been shown to be effective at controlling both legionella and biofilm growth in hot and cold water systems.

In the appropriate application, it may be used to aid legionella control where maintaining a conventional temperature regime is difficult or where the removal of all dead legs and little used outlets is impractical.

Chlorine dioxide is usually produced on site from a chlorite-based precursor using a chlorine dioxide generator or dosing system by reaction with one or more other chemical precursors or by a catalytic oxidation process.

Why is it used? 

It has a bacterial efficiency comparable with that of free chlorine in the neutral pH range, however unlike chlorine, its efficiency increases as the pH rises. Another important fact is that it is extremely soluble in water, being up to five times more soluble than chlorine.

Used commercially in aqueous solution rather than gas due to its explosiveness when exposed to rising temperatures, exposure to light or allowed to come into contact with organic substances. In aqueous solution it is completely harmless and will not react chemically with water, as would chlorine. It can be used up to a maximum dose level of 0.5ppm for drinking water disinfection, and has a particular advantage where phenol’s are likely to cause taste problems or in waters which have high pH or ammonia levels.

What do the HSE say? 

The advice form the HSE is that where temperature control is not achieved, other measures such as using appropriate biocides should be considered (e.g. chlorine dioxide). Chlorine dioxide is an oxidising biocide/disinfectant that when used correctly, has been shown to be effective at controlling both legionella and biofilm growth in hot and cold water systems. In the appropriate application, it may be used to aid legionella control where maintaining a conventional temperature regime is difficult or where the removal of all dead legs and little used outlets is impractical.

What our generators look like

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SPECIFICATION
Overview Proportional dosing of ClO2 using an inline water meter to signal the controller and dose two precursor chemicals simultaneously into a reaction chamber which holds the chemicals for a period of no less than 14 minutes. The pre cursors react within the chamber and >90% active ClO2 is dosed into the water supply.
Precursors 6.7% Low Alkalinity – 7.5% Standard Sodium Chlorite EN938

<10% Hydrochloric Acid EN939

To produce Chlorine Dioxide in conformance with EN 12671:2009

Capability Upto 300 grams/hour
i/o 1 x Water Meter Pulse input (required pulse duration >40ms & <1s) 1 x ClO2 residual monitor input

1 x Flow sensor input

1 x Low Chemical VFC output

1 x General Fault output (N/O potential free contact. Max 250V, 6A, invertable)

1 x 4-20mA Residual ClO2 level output

1 x Modbus RTU RS485 output, Baud rate 19200 bps, data format 8 bit

1 x Relay for activating a circulation pump

HMI Inductive TFT Touchscreen
Logging Onboard data logging with SD card

Off site data logging on ‘Cloud Connect’ portal

Electrical requirements 230VAC, 50Hz, single phase, 3 amp fused spur
Format/ dimensions Wall mounted enclosure 600mm x 400mm x 250mm
Sensors Potentiostatic 0-10 mg/l ClO2 measurement. Upto 6 bar back pressure permitted.

30 l/h sample water to inline flow cell. 8mm O/D connections to sample cell. Temp range 5˚C – <50˚C

Bund leak sensors in pump enclosures and reactor enclosure.

ClO2 Gas in air detector EC28 gas detector with display, 0-2mg/l with analogue output wiring to Bravo PLC.

24V supply from Controller.

Install at low level.

Reactor 2” Tee with BSP union pr stub flange connections
Dosing pipework ¼” schedule 80 PTFE dosing pipework, fittings and fixtures between the dosing pumps and reactor / site specific
Chemical dosing drums enclosure Capacity for 2 off 25 litre chemical drums (1 of each precursor) Leak detection

Floor standing

Lockable with door