Water is a fundamental human need. Every person requires at least 20-50 liters of clean, safe water a day for drinking, cooking, and maintaining personal hygiene [^1^]. Nevertheless, during emergency situations like natural disasters, wars, and disease outbreaks, the availability of unpolluted water can become scarce. To confront such unexpected circumstances, there exist several water disinfection methods proved to be swift, competent, and reliable.
Including a wide variety of methods, from boiling to the use of chemicals like chlorine, iodine, and ozone, water disinfection is the process that kills, deactivates, or removes pathogenic microorganisms in water. It is crucial to be aware of these methodologies, especially during emergencies where traditional water supply systems fail. This article will explore these techniques, their key features, benefits, and drawbacks.
Water Disinfection Methods
Boiling
One of the best and easiest ways to disinfect water is by boiling. A rolling boil of one minute is efficient in killing bacteria, viruses, and many types of parasites [^2^].
Pros:
- No special tools needed
- Very high efficiency in killing pathogens
Cons:
- Not suitable for removing chemical pollutants
- Energy consume might be high depending on the resources available
Chlorine Disinfection
Chlorine is one of the most commonly used disinfectants due to its effectiveness and accessibility. Chlorine tablets, liquid bleach, and granular powder can all be used to treat water [^2^].
Pros:
- Easy to use
- Effective in killing many types of microorganisms
Cons:
- Some waterborne pathogens are chlorine-resistant
- The resulting taste may not be pleasant
Iodine Disinfection
Similar to chlorine, iodine tablets or tincture can be used. This method is popular among travelers and backpackers due to its portable nature.
Pros:
- Portable and user-friendly
Cons:
- Not safe for pregnant women and people with thyroid problems
- Might give an unpleasant taste to the water
Solar Disinfection (SODIS)
Favored in low-income communities, SODIS relies on UV light from the sun to inactivate bacteria and viruses present in the water [^3^].
Pros:
- Requires only sunlight and plastic bottles (PET-bottles)
- Low-cost method
Cons:
- Requires 6 hours to 2 days of sunny weather
- Not effective against chemical pollutants
Portable Water Filters
These devices contain microscopic pores that can remove contaminants as small as bacteria, viruses, and protozoa, offering a reliable source of clean water.
Pros:
- Effective, reliable and portable
- Does not alter the taste of water
Cons:
- Requires manual operation (pumping)
- More extensive and microscopic contaminants may not be completely filtered
Conclusion
The access to clean and safe water is crucial for survival, especially in emergency situations. Depending on the frequency of use or urgency, different disinfection methods can be used to ensure potability. In terms of choosing which disinfection method to use, consider factors such as availability, ease of use, efficiency, and the nature of the emergency situation.
The right knowledge, preparation, and materials can secure safe water during emergencies: enabling the reestablishment of sanitation practices, preventing water-borne diseases, and providing for consumption needs.
[^1^]: WHO – Water