Chlorination
Gas Chlorination
Chlorine gas is widely used as the primary disinfecting ingredient in the Water Industry. It acts as a fast oxidising agent, treats organic taste and odour and produces a free chlorine residual.
Due to the hazardous nature of chlorine gas the maintenance and operational staff of a chlorine plant need to be well trained personnel. The product has a Dangerous Goods Classification for storage, handling and transport. There are some undesirable chloro-organic compounds produced when chlorine disassociates with ammonia and organic matter in the water supply.
WestWater supply chlorine gas safety systems including Gas Leak Detectors and the Chlorshield Automatic Shutdown System. We can also provide Training for your staff members.
A typical chlorine installation will draw gas from a storage container, control and meter gas flow and dissolve the gas into an aqueous solution for use by the process
The range of equipment available for use of chlorine includes Vacuum Regulators, Chlorinators, Ejectors and Residual Chlorine Analysers, gas detection and shutdown systems.
Liquid Chlorination
Commercially available sodium hypochlorite is produced at 12.5% available free chlorine held in a caustic based solution. It can be transported as a liquid, injected by metering pumps and in smaller installations can be decanted from bulk storage into smaller containers.
Sodium Hypochlorite has a defined shelf life and the concentration will decay in strength over time. It has a tendency when pumped at 12.5% to produce off-gassing particularly in the suction line of solution pumps. The Occupational, Health and Safety hazards are exacerbated by the caustic base.
Bulk deliveries of sodium hypochlorite are available from the manufacturer, alternatively smaller quantities are available in pre-packaged containers.
Sodium Hypochlorite dosing packages often include a storage tank and require a bund to retain possible leaks or spillage. A well designed system will have a dosing pump with a multi function valve to protect against off-gassing from the solution.
WestWater NT has the experience and knowledge to design a package specific to your requirements.
Electro Chlorination
On-Site Generation - Electrochlorination
DC current is passed through the saline solution. The anode oxidizes the chloride irons to produce CL2 while the cathode reduces the water to produce an NaOH solution plus hydrogen H2. The chlorine reacts with the NaOH solution to produce NaOCL.
WestWater are the sole agents and distributors for the Severn Trent Services range of Electrochlorination products.
Brine
Severn Trent is the market leader in the on-site generation of sodium hypochlorite from fresh water, having over 3,000 installations worldwide. Their ChlorTec on-site sodium hypochlorite generating systems range in capacity from 0.9 to 1,360 + kg/day of chlorine equivalent and generate a 0.8% sodium hypochlorite solution using three common consumables: salt, water and electricity. Depending on application or site specific needs, ChlorTech systems are available as skid-mounted or component based systems. The skid mounted systems are fully operational and generating sodium hypochlorite in less than 24hrs
Seawater
Sanilec and Seaclor for the on-site generation of hypochlorite from raw seawater have demonstrated reliable, economic and low maintenance operation in numerous installation through the world. Sanilec and Seaclor systems range in capacity from 1.2 to 21,6000kg/day, per train.
Seaclor systems are the standard and preferred electrochlorination unit for biofouling control in power plants, cooling towers, liquefied natural gas (LNG) terminals and desalination facilities, as well as coastal installations using sweater for cooling or other process needs all over the world.
