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Chlorine Free Water Treatment Applications

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    Chlorine Dioxide Water Treatment for Power Plants

    Chlorine dioxide is a significant product in the control of algae, planktonic and sessile bacteria, bio-film and scale in power plants, cooling towers, loops and cooling systems. CleanOxide helps maintain the efficiency of heat exchanger surfaces, reservoir intakes and ancillary equipment. Traditional oxidising agents such as chlorine and bromine, on the other hand, are associated with pH constraints and corrosion problems.

    By NW Solutions based in Perth, AUSTRALIA.

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    Chlorine Dioxide Water Treatment for Oil and Gas Refinieries

    Injecting chlorine dioxide into a well is an established technique for removing sulphides and sulphates from oil and gas wells. CleanOxide Chlorine Dioxide is a practically pure solution of chlorine dioxide. It rapidly oxidises the naturally occurring iron compounds, and is also effective at breaking up and removing organic solids and added polymers.

    By NW Solutions based in Perth, AUSTRALIA.

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    Ultraviolet disinfection systems for the de-chlorination industry

    The purpose of de-chlorination is the removal of free chlorine and combined chlorine compounds from potable water, as supplied by municipal water supplies. Chlorine will oxidize the surface of thin film composite polyamide membranes, causing the membrane to lose its ability to repel or reject salts. As a result, the membranes used in Reverse Osmosis (RO) or Electro-deionisation (EDI) systems will exhibit shorter lifetimes when exposed to chlorine in the water they are treating and membrane manufacturers will usually specify an upper limit to ensure a suitable life of the membrane. As a result, it is usual to use a method of dechlorination upstream of the RO or EDI system.

    By atg UV Technology based in Wigan, UNITED KINGDOM.

  • Cyanide Treatment with Hydrogen Peroxide

    Cyanides are used in a number of chemical synthesis and metallurgical processes (as simple salts or cyanide complexes). As a class, cyanides are highly toxic and must be destroyed or removed from wastewaters prior to discharge. The most common method for treating free or simple cyanide is alkaline chlorination. However, chlorination of cyanide results in highly toxic intermediates (e.g., cyanogen chloride) and, if organic material is present, chlorinated VOC’s. These compounds, together with the residual chlorine, create additional environmental problems. Consequently, there is a growing need for alternative, non-chlorine methods for destroying cyanides. Peroxygen compounds such as hydrogen peroxide, peroxymonosulfuric acid (1), and persulfates (1) are effective alternatives to alkaline chlorination for destroying free and complexed cyanides. The choice of peroxygen system depends on the reaction time available, the desired products (cyanate, or CO2 and NH3), the types of cyanides being treated (free, weak acid dissociable, or inert), and the system economics. Treatment with Hydrogen Peroxide While hydrogen peroxide will oxidize free cyanide, it is common to catalyze the reaction with a transition metal such as soluble copper, vanadium, tungsten or silver in concentrations of 5 to 50 mg/L (2).

    By USP Technologies based in Atlanta, GEORGIA (US) (USA).

  • Ozone/UV systems for swimming pool water treatment

    Studies have proven that chlorine use has negative consequences due to the formation of byproducts, i.e. chlorinated organic compounds and chloramines. Irritation of eyes and mucous membranes, drying out the skin as well as “chlorine smell” are well known troubles. However, these byproducts also accelerate the corrosion in pool halls and significant risk is given by their toxicity (chloramines, combined chlorine) and/or carcinogenicity. Higher rate of asthma prevalence is one of the consequences. These are the reasons why the combined chlorine content - as a marker of chlorination byproducts presence - is to be monitored and why its limit values are specified by authorities. To meet the limits can be tedious and expensive because more water has to be changed and heated up. Chlorine disinfection is not sufficient to prevent infections caused by some waterborne pathogens as dangerous protozoan parasites Cryptosporidium parvum and Giardia lamblia.

    By LIFETECH based in Brno, CZECH REPUBLIC.

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