Brominators & Chlorine Dioxide Generators – Frequently Asked Questions (FAQs)
What is a brominator?
A brominator is a vessel which contains a bromo-chloro compound in tabletted form. A flow of water through the brominator results in dissolution of the tablet to produce a solution of bromine which can then be fed to the cooling water system and process system where micro-biological control of micro-organisms are required.
What types of chemicals are used in the brominator?
Brominators are specific for use with bromine tablets. These tablets may be known as bromine-release tablets, organo halogen tablets or chemically referred to as hydantoin tablets.
What are the typical components of a Derwent Brominator?
The brominator consists of:
Brominator vessel – manufactured from reinforced vinylester resin
Inlet and outlet pipework – uPVC pipework and fittings; all pipework is pre-assembled and works-tested
Spanner for vessel opening
Cone for filling vessel with tablets
Flow indicator for adjustment of water flow and dissolving rates
How do I size a brominator?
The rate of dissolving of the bromine tablets is determined by the flow rate, the amount of tabletted surface area in the vessel and the temperature of the water feeding the brominator.
The actual amount of bromine required in the cooling water system or process system is normally decided by your water treatment representative. Typically, for cooling systems, this will be 1 ppm to 3 ppm of free bromine for legionella pneumophila and bacteria control.
By consultation with your water treatment representative and the Derwent Water Systems’ technical team, a suitable brominator can be sized to meet your requirements.
How is the bromine dispenser controlled and can it be automated?
The rate of dissolving of the tablets can be easily controlled by adjustment of the flow of water through the unit by altering the flow regulator valve on the flow meter indicator.
For automatic control, we have available:
Timer and solenoid control
Redox meter and solenoid control
What sizes of brominators are available?
There are 11 standard brominators on the Derwent range which go from a recharge capacity of 15 kgs up to 425 kgs.
The flow rates can be varied according to the flow meters. The smallest flow meter range is 17.5 to 175 litres/hr, up to a maximum flow range of 4000 to 16000 litres/hr.
What feed water pressure can be used to feed the brominator?
Typical maximum feed water pressure is 8.5 bar on the standard range, although the vessels are rated at 10 bar.