Wastewater to Power Fruit Juice Factories

Brazilian Scientists Have Developed a Way to Use WasteWaterfrom the Orange Juice industry to Generate Power, which Could Help Reduce Factory Carbon Emissions

The technology, created by scientists at Sao Paulo State University, uses waste water produced by orange processing to make hydrogen. Hydrogen has a highenergydensity and produces nopollution, making it a good source of clean energy.

The research project, which was completed last month, was led by Sandra Maintinguer, a researcher at the university's Center for Monitoring and Research of the Quality of Fuels, Biofuels, Crude Oil and Derivatives. The work, which was funded by the Sao Paulo Research Foundation (FAPESP), is ready to be piloted at local juice factories.

Maintinguer explains that using waste water from orange juice production would work best on a small scale, creating energy on the factory grounds without the need for transportation. The energy is meant to be fed right back into running the factory.

"We can combine the treatment of the industrial effluents with energy generation," Maintinguer says. "We propose to install a reactor to capture hydrogen and generate electricity out of the waste water. This energy could be used as asustainablesolution to provide electricity to factories."

Using laboratory tests, Maintinguer and her team found that waste water from juice production, which contains about 12 grams of sugar per litre, is better suited to hydrogen generation than the molasses obtained from refining sugar or vinasse (the residue left after distilling spirits), which contain up to 150 grams of sugar per litre and have also been trialled in clean energy production. Too much sugar prevents the growth of the bacteria that break down the sugar and generate hydrogen in the process, she explains.

According to Valeria Spiller, a bioenergy researcher at the University of Sao Paulo, producing hydrogen gas from waste water could be an option for other industries too, such as those making beer and fertiliser. She says Maintinguer's work follows a global trend to improve local energy production in countries with suitable industries.

"Brazil has diversified agroindustrial activity, and its residue and effluents might be reused as raw materials to power generation," Spiller tells SciDev.Net .

Thetechnologyis especially suited to many developing nations, because of the temperatures at which the hydrogen-producing bacteria prosper. Maintinguer says that Brazil's warm environment is perfect for this, as the bacteria grow best at around 25 degrees Celsius.

Source: Scidev

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• Treatment
• Sludge Separation
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