Water treatment system comprising water-soluble glass

Details Water treatment system comprising water-soluble glass Water treatment system comprising water-soluble glass

1996-08-09

1998-08-11

Hruskoci, Peter A.

Liquid purification or separation

Processes

Preventing, decreasing, or delaying precipitation,...

2101981, 252176, 422 18, 422264, 422278, C02F 504

Patent

active

057923604

DESCRIPTION:

BRIEF SUMMARY
Most of the water employed for industrial purposes is used for cooling a product or process. The availability of water in most industrialised areas and its high heat capacity have made water the favoured heat transfer medium in industrial and utility type applications.
Modern cooling towers are evaporative cooling systems which substantially reduce water use rate compared to the older once through systems. These changes in cooling water system design and operation have a profound impact on the chemistry of water as it influences corrosion, deposition and fouling potential in the system.
Corrosion is a function of water characteristics and the metals in the system. Corrosion causes premature metal failure; deposits of corrosion products reduce both heat transfer and flow rates.
Scale (deposition) is caused by precipitation of compounds that become insoluble at higher temperatures such as calcium carbonate. Scale interferes with heat transfer and reduces flow.
Fouling results from the settling out of suspended solids, build up of corrosion products and growth of microbial or algal masses. Fouling can result in reduced heat transfer but more importantly in the growth of health-threatening bacteria, such as Legionella pneumophilla.
Cooling water systems are conventionally treated with a range of chemicals to prevent or reduce the problems caused by corrosion, scaling and fouling. Examples of such conventional chemical treatments are shown in the following table:


Chemical Components of Cooling Water Treatments



______________________________________ Problems Chemical Treatments Corrosion Scaling Fouling Microbes ______________________________________ Chromates X Zinc X Molybdates X Silicates X Polyphosphates X X Polyol esters X Phosphonates X X All-organics X X X Natural Organics X Synthetic polymers X X Nonoxidizing biocides X X Chlorine/bromine X Ozone X ______________________________________
These conventional chemical treatments are either used as intermittent doses or are added continuously via a dosing pump. It would be a significant improvement if chemicals could be released continuously into the water thus eliminating the need to handle the generally toxic chemicals on a regular basis or to rely on the dosing pump working without breakdown.
The solubility of phosphate glasses and their ability to deliver long chain alkali polyphosphates or metal ions continuously to water bodies or other aqueous media is well known. However, until now there has been no method available whereby the glass could be used in a range of waters and dissolve at a known consistent controlled rate.
The present invention provides a water treatment system for submersion in a body of water to be treated which system comprises a water-soluble glass treatment agent and a water-insoluble retaining means for the water-soluble glass, the said retaining means being adapted, in use, to prevent a flow of water from contacting the water soluble glass and to retain water in contact with the water-soluble glass such that the water-soluble glass dissolves in the retained water forming dissolution products therein and to allow said dissolution products to diffuse into the body of water being treated. The present invention also provides a method of treating water comprising submerging into a body of water to be treated a system as herein described. The system is suspended in, or otherwise submerged in, the body of water to be treated. In use, the retaining means for the water-soluble glass retains water in contact with the water-soluble glass. The glass starts to dissolve in the water retained or trapped in the retaining means and this trapped water becomes concentrated with the products of the glass dissolution.
Under these conditions the soluble glass will dissolve at a rate which is substantially independent of the hardness of the water. The products of dissolution will diffuse into the body of water. It is essential that the retaining means is capable, in use, of retaining water in contact with th

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