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Disinfection

Disinfection is the single process that has the greatest impact on water safety, resulting in the elimination of potential waterborne disease. The purpose of disinfection in the treatment of water and wastewater is to substantially reduce the number of microorganisms in the water that is to be reused or discharged. The effectiveness of disinfection depends on the quality of the water being treated (e.g., turbidity, impurities, pH, etc.), the type of disinfection being used, the disinfectant dosage (concentration and time) and certain other environmental variables. Ovivo have many years of experience in this field and are ideally qualified to recommend the most suitable system on the basis of cost, value and reliability.

Further Details

Cloudy water will always be treated less successfully since organisms can be shielded by solid matter, in particular from UV light or if contact times are low. Generally, short contact times, low doses and high flows will compromise effective disinfection.

Methods

Various agents and processes can be used to disinfect water, including oxidizing agents such as chlorine, chlorine dioxide and ozone, and ultra violet light.

The selection of disinfection agent very much depends upon a number of factors, including: raw water type and quality, if a persistent residual is required, flow, considerations, environmental as well as health and safety considerations. For example, chlorine effectiveness is dependent upon pH, but gives a good residual and can give rise to disinfection by-products if organics are present; ultraviolet sterilizers can be excellent for the cleaning of continuously flowing waters, but are less suitable where a residual is required or the water contains particulates.

 

Monitoring

Disinfection is of paramount importance in controlling microbial quality. Particular attention should be paid to operational factors such as pH, disinfectant residual and turbidity, which should be monitored frequently.