THE IMPORTANCE OF ANIMAL DRINKING WATER
The Good Manufacturing Practice Guidelines emphasize that water must meet a number of characteristics:
- The absence of foreign odors, tastes and colors.
- Absence of coliform bacteria (MAPAMA 2005, GBPs).
It is essential that farms have an adequate, clean and disinfected water supply system that guarantees the non-contamination of water. However, many times the treatments are not carried out correctly, with very negative consequences for animal health, turning untreated water -or with an inadequate treatment- into a vehicle of pathologies of great importance such as Clostridiosis, Colibacillosis or even processes of obligatory declaration, such as Avian Influenza or Salmonella.
Periodic water quality analysis is highly recommended to ensure proper sanitation.
Water from livestock farms can have different origins:
- Public water supply
But it is usually stored in tanks that supply the farm.
Even the water from the public water supply may not reach the animals in the correct conditions since, in most cases, the farms are located far from urban centers and when long distances are involved it is easy to lose the disinfectant efficacy, chlorine being the one usually used for the treatment of urban water.
Therefore, regardless of its origin, water treatment must be considered as a key element for biosecurity in livestock farms.
Within the wide range of products for water treatment, the enormous usefulness of chlorine dioxide stands out.
USEFULNESS OF CHLORINE DIOXIDE IN WATER TREATMENT
Chlorine dioxide (ClO2) is a yellowish green gas, highly soluble in water, which acts as a powerful selective oxidizing biocide. This allows for lower dosing to achieve a stable residual.
The high microbiocidal capacity of chlorine dioxide makes it a broad-spectrum disinfectant against bacteria, viruses, fungi and even spores and cysts.
The efficacy of chlorine dioxide has been demonstrated against multiple pathogens of importance in Animal Health, such as L. monocytogenes, E. coli, Salmonella spp or Influenza A virus (Hwang CA et al, 2017).
In aqueous solution, ClO2 is hardly dissociated and can exert its disinfectant action very independently of pH, acting in a range from 4-9. Unlike other disinfectants that are inactivated by the presence of organic matter, chlorine dioxide does not interact with it, nor is it affected. This makes it effective even in water with high organic matter content, without generating residues that other compounds, such as chlorine, generate when reacting with it.
Table 1. Comparison of the C-T (Concentration-Time) value of disinfectants in drinking water against reference microorganisms, where T is the time (minutes) required for a concentration -C- (mg/L) of residual disinfectant to inactivate a microorganism.
|Microorganism||Clorine (pH 6-7)||Cloramine||Dixclor tablets (CIO2)|
|Escherichia coli||0,034||95 -180||0,02 – 0,75|
|Poliomeilelitis 1||1,1 – 2,5||768 – 3740||0,2 – 6,7|
|Rotavirus||0,01 – 0,05||3806 – 6473||0,05 – 0,2|
|47 – 150||2200||26|
|Quistes Giardia Muris||30 – 630||1400||7,2 – 18,5|
|Microorganism||ppm (mg/L)||Response time|
|Staphylococcus aureus||1||30 seg|
|Mycobacterium tuberculosis||19||1 – 3 min|
|Escherichia coli||0,25||1 min|
|Salmonella tiphy||0,04||1 min|
|Aspergillus niger||38||1 hour|
|Polio virus||0,114||16 min|
|Aujezsky (Pseudorrabia)||0,1||1 min|
|Coronovirus||0,09||2 – 3 min|
|Parvovirus||0,08||1 – 2 min|
|Pseudonomas florecens||2||15 seg|
|Pseudonomas aeruginosa||1||5 min|
|Gripe Aviar H5N1||0,8||2 min|
The low doses of chlorine dioxide required to kill different pathological agents are observed in comparison with other chlorinated disinfectants.
¿WHAT IS BIOFILM?
Biofilms are complex communities of microbial agents, associated with a living or inert surface (such as soils, tools in livestock farms, or equipment in slaughterhouses and processing plants), which excrete a protective and adhesive extracellular matrix, called glycocalyx. Usually these microbial communities are made up of different species of bacteria that interact with each other and with the environment in which they are found.
Bacteria communicate with each other through chemical signals and can even act as if they were a “tissue”, so that this type of association changes the metabolism and structure of the bacteria. Contrary to what was believed until recently, the ability to form biofilm does not seem to be restricted to certain bacterial types, but all bacteria are capable of producing biofilm under suitable environmental conditions.
BIOFILM IS ONE OF THE MAIN RISK FACTORS FOR MICROBIOLOGICAL WATER QUALITY.
Chlorine DIOXIDE destroys the disulfide bridges that form in the biofilm, eliminating it and thus being able to act against the bacteria that are protected in it.