Lens to Purify Drinking Water

Self-sustaining Magnifying Glass Uses Sunlight to Heat and Disinfect Polluted Water

Water may appear to be an abundant resource, but in some parts of the world clean water is hard to come by

That could change through the work of Deshawn Henry, a University at Buffalo sophomore civil engineering major, who researched how to improve a 6-foot-tall, self-sustaining magnifying glass.

Properly termed a water lens, the device uses another abundant resource—sunlight—to heat and disinfect polluted water. Since the frame for the lens can be constructed from commonly found materials—wood, plastic sheeting and water—the lens can be built for almost no cost, offering an inexpensive method to treat water.

The device may not look like much, but it can heat a liter of water to between 130 and 150 degrees Fahrenheit in a little more than an hour, destroying 99.9 percent of bacteria and pathogens.

"The water lens could have a huge impact in developing countries," says Henry, a Queens' native who performed the study under James Jensen, professor in the Department of Civil, Structural and Environmental Engineering.

"Millions of people die every year from diseases and pathogens found in unclean water, and they can't help it because that's all they have. Either they drink it or they die."

The lens consists of a plastic sheet covered with water supported by a wooden frame. The frame holds a small container of water below the lens in line with a focal point created from a concentrated ray of sunlight. Barring the weather, once assembled, the lens functions freely. Due to the sun's movement throughout the day, Henry needs to repeatedly shift the container to match the focal point.

Henry's research tested how altering the thickness of the plastic sheet and the volume of water over the sheet affected the efficiency of the lens. The device was tested with plastic sheets that were 0.7, 1 and 2 millimeters thick, and water volumes of four, six and eight liters.

The study found that adding more water to the lens improved efficiency, as larger areas of water transmitted more energy from sunlight. However, thicker plastic sheets consumed more energy from light, lowering the lens' efficiency.

Source: Daily Fusion

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• Purification
• Water Treatment Solutions