Product category:
Potable water, test and treatment
News Release from: Grundfos Alldos | Subject: Selcoperm
Edited by the Processingtalk Editorial
Team on 20 February 2008
Simple system for hypochlorite water
disinfection
The Grundfos Alldos electrolytic chlorination system, called Selcoperm, provides safe and simple production of hypochlorite solution for water disinfection, for surface water purification
Microbiologically clean non polluted water, preferably deep ground water, should be used as drinking water Unfortunately, in some regions this is not possible for hydrogeological or quantitative reasons
This article was originally published on Processingtalk on 7 Jul 2005 at 8.00am (UK)
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In these regions, surface water is used, which often has to be purified.
Pathogens that are possibly encountered, can be removed from the water or killed by adding certain substances to the water, i.e by disinfecting the water.
The most widespread disinfectant used in the treatment of drinking water is chlorine, which can be applied in a variety of ways.
Further reading
Hypochlorite dosing with battery run systems
Alldos has added a 24V DC version to the TrueDos range of dosing pumps rated up to 20 litre/hour at 3bar
TrueDos flow monitor digital dosing pump
The TrueDos flow monitor digital dosing pump from Alldos brings to the field a new concept allowing users for the first time to establish 'what's happening in the dosing head'
The disinfecting properties of chlorine are based on the fact that hypochlorous acid (HClO) is produced when it is dissolved in water, and this depends strongly on the pH value.
Generally, three methods are used for chlorinating drinking and process water.
Besides the dosing of chlorine gas or sodium hypochlorite solution, electrolytic chlorine generation is used.
This third method in particular offers a number of advantages, which are incorporated in the Grundfos Selcoperm electrolytic chlorination systems.
With electrolysis, chlorine is produced directly from a solution of common salt, using electricity, without creating any notable by-products.
The solution generated has a pH value between 8 and 8.5, and a maximum equivalent chlorine concentration of less than 6 - 8 g/l.
It has a half-life of several months, which makes it ideal for storage in a buffer tank.
Key components in the Selcoperm unit include an electrolysis system, storage tanks for the saturated salt solution and product solution, an exhaust fan for removing any hydrogen produced, and dosing pumps for the product solution.
The concept is rounded off with a measuring and control unit for chlorine dosing.
The electrolysis system is supplied as a turn-key solution.
It has a long service life and low maintenance costs.
The size of the storage tanks depends on the capacity level of the system and the amount of disinfectant solution required.
Standard Selcoperm electrolysis systems are available in five capacity levels.
The choice of the system depends on the maximum daily chlorine demand (dosing quantity x daily maximum water flow rate).
The operating costs are low, as only water, common salt and electricity are required.
Typical disinfection applications for electrolytic chlorination systems are especially in drinking water and swimming pool water treatment.
The systems are an excellent alternative to chlorine-gas or commercial hypochlorite applications. Request a free brochure from Grundfos Alldos ...
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