Abstract
The paper focuses on the issue of drinking water supply without use of any disinfectants. Before the public water supply network operator begins to consider switching to operation without use of chemical disinfection, initial assessment should be made, whether or not the water supply system in question is suitable for this type of operation. The assessment is performed by applying the decision algorithm. The initial assessment is followed by another decision algorithm which serves for managing and controlling the process of switching to drinking water supply without use of a disinfectant. The paper also summarizes previous experience and knowledge of this way operated public water supply systems in the Czech Republic.
Highlights
Objective of the public water supply systems operators is to supply drinking water to the consumers in the required quantity and quality to meet the requirements stipulated by the Decree No 252/2004 Coll., which sets drinking water limits in the Czech Republic
The decision algorithm of the first assessment is linked with the algorithm controlling the process of transition to the operation without use of any disinfectant, and the latter is extended by undesired events and factors that can occur immediately after discontinued chlorination
Reaction of chlorine can result in conversion of high-molecular natural organic compounds into simpler substances serving as a substrate for bacteria
Summary
Objective of the public water supply systems operators is to supply drinking water to the consumers in the required quantity and quality to meet the requirements stipulated by the Decree No 252/2004 Coll., which sets drinking water limits in the Czech Republic. Research and experience from practice bring many new insights into functioning of the chlorine-based chemical disinfection They show its negative aspects, mainly undesirable affection of taste and smell and occurrence of the so-called disinfection byproducts. These disinfection by-products and the negative public approach to chlorine in water have prompted several countries, in particular the Netherlands, Switzerland and Germany, to gradual transition to drinking water supply without use of a chlorine-based disinfectant that remains in water as the residual disinfectant.[1, 2, 3, 4] In these countries, public water supply network operators rely on the adequate number of security barriers protecting the system from microbial contamination from the outside environment. If the number of barriers is sufficient, water can be distributed without any disinfectant. [1, 3, 4]
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