Solar Water Disinfection (SODIS) UV Exposure Time at 3,000m

Introduction:

Solar Water Disinfection (SODIS) is a simple, cost-effective, and environmentally friendly method for purifying drinking water. It involves exposing water to ultraviolet (UV) radiation from the sun’s rays to kill harmful pathogens. However, the effectiveness of SODIS can be influenced by various factors, including altitude. In this article, we will discuss the UV exposure time required for SODIS at an altitude of 3,000 meters.

Altitude and UV Radiation:

At higher altitudes, the Earth’s atmosphere is thinner, resulting in less atmospheric scattering and absorption of UV radiation. Consequently, the intensity of UV radiation increases with altitude. This means that the UV exposure time required for SODIS may be shorter at higher altitudes compared to lower altitudes.

UV Exposure Time at 3,000m:

The UV exposure time required for SODIS at an altitude of 3,000 meters depends on several factors, including the time of day, season, and cloud cover. Generally, the UV exposure time at this altitude is expected to be shorter than at sea level.

1. Time of Day:

The UV radiation intensity is highest during midday, and the exposure time required for SODIS is shortest during this period. At 3,000 meters, the UV exposure time for SODIS is approximately 20-30 minutes during midday. However, this duration may vary slightly depending on the specific location and weather conditions.

2. Season:

The UV radiation intensity also varies with the season. During the summer months, the UV radiation is stronger, and the exposure time required for SODIS is shorter. Conversely, during the winter months, the UV radiation is weaker, and the exposure time may be longer. At 3,000 meters, the UV exposure time for SODIS during the summer is around 20-30 minutes, while during the winter, it may take 30-40 minutes.

3. Cloud Cover:

Cloud cover can significantly affect the UV radiation intensity and, consequently, the exposure time required for SODIS. On cloudy days, the UV radiation is weaker, and the exposure time may be longer. At 3,000 meters, if the sky is overcast, the UV exposure time for SODIS could be around 40-60 minutes.

Conclusion:

In conclusion, the UV exposure time required for SODIS at an altitude of 3,000 meters is approximately 20-30 minutes during midday in the summer, and 30-40 minutes during the winter or on cloudy days. It is essential to consider these factors when using SODIS at higher altitudes to ensure the effective disinfection of drinking water. By understanding the influence of altitude on UV radiation intensity, individuals can optimize the SODIS process and improve access to safe drinking water in remote and mountainous regions.