Rapport forside

Limitations in drinking water resources is a major problem worldwide, particularly in arid areas. One solution for obtaining drinking water is to purify surface water to drinking water quality. The problem with current solutions for this purpose is that they either produce water in too small amounts, require bigger installations and secure infrastructure, are too expensive, or require considerable expertise to work optimally. This report describes the development of a water treatment system with a compact size and which only requirement is a power supply, making it ideal for emergency situations.

The water treatment plant consists of a flocculation tank, a filtering unit, and an advanced oxidation unit. Different secondary filtering units was also tested in the plant development, but it was found that they needed to be changed too often for field applications. In the flocculation unit, electrocoagulation was accomplished by using electrical current to generate free iron that reacts with the fine particulate material in the water. The process creates flocculates and helps to remove suspended solids to sub-micrometre levels, breaks emulsions such as oil and grease or latex, removes phosphate and lowers the particle concentration without the use of filters or the addition of separation chemicals. The filtering unit in the plant, developed by BIO-AQUA A/S, is based on flexible polymer threads, which allows for back-flushing. The advanced oxidation unit, developed by Adept Water Technologies, is based on electrolysis principles that uses naturally occurring chloride in the water, to produce a residual dis-infective effect.

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