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Home Power

Harnessing Photovoltaics for Wastewater Disinfection

editor by editor
February 2, 2024
in Power
Reading Time: 2 mins read
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Photovoltaics
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Researchers from Spain’s University of Jaen have developed a novel technology for wastewater disinfection and the production of PV energy.

The Open SolWat system is designed for tertiary treatment – the third and final process in wastewater treatment plants (WWTP). It is an upgrade of SolWat technology, which consists of a photochemical technology integrating PV modules and water disinfection reactors.

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“To extend the system to commercial use, preliminary experimental studies need to be carried out using a large-scale prototype. Optimization of this technology will involve the use of energy-efficient water pumps. In addition, a study of their energy consumption and an economic analysis of the system will be carried out,” researcher J.

The research group said that the technology harnesses various wavelengths of solar radiation for distinct purposes. It uses ultraviolet (UV) and far infrared (FIR) radiation to disinfect water, significantly reducing the presence of harmful microorganisms. Additionally, visible (VIS) and near-infrared (NIR) radiation are used to generate electricity through the photovoltaic module.

The Open SolWat system operates dynamically with water recirculation to reduce the operating temperature of the solar module. It consists of a PV module over which a 1 mm thin film of water flows thanks to a pumping system. The water is spread across the front side of the panel and is then collected in an external water tank made of aluminum L-profiles, with a funnel transferring the water to the tank.

“The tank is exposed to solar radiation and functions as a solar water disinfection reactor,” the scientists said, noting that in the classic SolWat closed configuration, an 18 mm thin film of wastewater is applied to the PV module, enclosed with borosilicate glass.

To test the feasibility of the system, the scientists have built two prototypes – the Small Open SolWat system and the large Open SolWat system.

“The first reactor consisted only of an L-shaped aluminum profile on top of the PV module, which was equipped with a perforated tube with 53 microtubes for the water outlet, spaced 1 cm apart,” they explained. “The second reactor was an open, translucent water tank measuring 62 cm x 45 cm x 18 cm.”

The largest prototype uses a 45 W module from UK manufacturer PV Logic, two water reactors and a magnetic coupling water pump with an average flow rate of 8.9 L/m manufactured by Germany’s Flojet Corporation. The smaller system uses a module with a nominal power of 5 W.

Tags: Germany’s Flojet CorporationPhotovoltaicsPV modulesSolWat technologyultravioletWastewater DisinfectionWWTP
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