A Simple Disinfection Device for Families in Underdeveloped Regions

Area of Science:

• Engineering
• Environmental Science
• Public Health

Background:

• Globally, over a third of the population lacks safe drinking water access.
• Limited availability of efficient water disinfection devices is a major barrier.
• Existing UV disinfection methods often require a stable electricity supply, restricting their use.

Purpose of the Study:

• To design a manually operated hybrid generator capable of powering UV mercury lamps for water disinfection.
• To create a portable, grid-free disinfection solution for areas with unreliable power.
• To assess the system's efficiency in pathogen removal and its potential for widespread adoption.

Main Methods:

• Developed a hybrid generator combining triboelectric nanogenerator and electromagnetic generator principles.
• Integrated a custom transmission system for efficient power transfer via cranking or pedaling.
• Tested the system's ability to power a UV mercury lamp for water disinfection.
• Quantified pathogen removal efficiency and water treatment capacity.

Main Results:

• The hybrid generator successfully powered a UV mercury lamp, demonstrating variable impedance matching.
• Manual operation (cranking/pedaling) achieved significant pathogen removal (8-log) from water.
• Pedaling treated 10 L of water in 15 minutes, meeting a family of four's daily needs.
• The system offers a low capital cost and a levelized cost of 8.57 USD/(capita·yr).

Conclusions:

• The manually operated hybrid generator provides a viable, grid-free solution for UV water disinfection.
• This technology has the potential to supply safe drinking water to approximately 1.8 billion people.
• The system significantly contributes to achieving United Nations Sustainable Development Goal 6.