According to the WHO/UNICEF Joint Monitoring Programme (JMP) for Water Supply and Sanitation, about 11 percent of the population does not have access to clean water — that's 783 million people around the world. Without an "improved source" of drinking water, these individuals face all sorts of health risks that could be reduced considerably if purified water were more readily available to them.
But since most of the people without access to clean water live in rural areas, scientists face unique challenges: The system for removing hazardous materials needs to be as portable as possible and not dependent on electricity.
Fortunately, a team from the Indian Institute of Technology Madras recently published a study in the Proceedings of the National Academy of Sciences dealing with low-cost, portable water filtration solutions. And the keyword is nanoparticles. They use a two-step process that sucks out all of the toxic stuff, like viruses, bacteria, arsenic and lead and yields around 2.5 gallons of purified water in just an hour. Read the original study here.
Via Phys Org