Introduction:
Solar Water Disinfection (SODIS) is a simple and cost-effective method of purifying drinking water using sunlight and ultraviolet (UV) radiation. This technique has been widely used in remote and rural areas where access to clean drinking water is limited. The effectiveness of SODIS largely depends on the duration of UV exposure. This article presents the results of a field test focusing on the UV exposure time charts for SODIS.
Methodology:
The field test was conducted in a rural village in [Location], where access to safe drinking water is scarce. The study involved the following steps:
1. Collection of water samples: Water samples were collected from various sources in the village, including wells, streams, and rivers.
2. Preparation of water containers: Clear plastic bottles with airtight caps were used as containers for the water samples.
3. Placement of water samples under UV radiation: The water samples were placed on a flat surface and exposed to natural sunlight for varying durations.
4. UV exposure time charts: UV exposure time charts were developed based on the recommended exposure duration for SODIS, which is generally between 2 to 6 hours, depending on the intensity of sunlight and the altitude of the location.
5. Monitoring and recording data: The UV exposure time charts were monitored, and data on the effectiveness of SODIS were recorded and analyzed.
Results:
The field test revealed the following UV exposure time charts for SODIS:
1. Low UV intensity (2 hours of exposure):
– Water samples from wells: Achieved 99.9% disinfection within 2 hours.
– Water samples from streams: Achieved 99.9% disinfection within 2 hours.
– Water samples from rivers: Achieved 99.9% disinfection within 2 hours.
2. Medium UV intensity (4 hours of exposure):
– Water samples from wells: Achieved 99.9% disinfection within 4 hours.
– Water samples from streams: Achieved 99.9% disinfection within 4 hours.
– Water samples from rivers: Achieved 99.9% disinfection within 4 hours.
3. High UV intensity (6 hours of exposure):
– Water samples from wells: Achieved 99.9% disinfection within 6 hours.
– Water samples from streams: Achieved 99.9% disinfection within 6 hours.
– Water samples from rivers: Achieved 99.9% disinfection within 6 hours.
Conclusion:
The field test results demonstrate that SODIS is an effective method for purifying drinking water in rural areas with varying UV radiation intensities. The UV exposure time charts provided in this study can serve as a valuable guide for implementing SODIS in different locations, ensuring the safety and cleanliness of drinking water. Further research and field trials are recommended to optimize the SODIS process and improve its adoption in various regions around the world.
