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Using wastewater as fertilizer
Date:8/7/2012

plits the water molecules into negatively charged hydroxyl ions at the cathode. At the anode an oxidation takes place: the magnesium ions migrate through the water and react with the phosphate and ammonium molecules in the solution to form struvite.

Energy-saving, chemical-free process

Because the magnesium ions in the process water are highly reactive, this method requires very little energy. The electrochemical process therefore consumes less electricity than conventional methods. For all types of wastewater tested so far, the necessary power never exceeded the extremely low value of 70 watt-hours per cubic meter. Moreover, long-duration tests conducted by the IGB researchers demonstrated that the concentration of phosphorus in the pilot plant's reactor was reduced by 99.7 percent to less than 2 milligrams per liter. This is lower than the maximum concentration permitted by the German Waste Water Ordinance (AbwV) for treatment plants serving communities of up to 100,000 inhabitants. "This means that operators of such plants could generate additional revenue from the production of fertilizer as a sideline to the treatment of wastewater," says Bilbao, citing this as a decisive advantage. Struvite is an attractive product for farmers, because it is valued as a high-quality, slow-release fertilizer. Experiments conducted by the Fraunhofer researchers have confirmed its effectiveness in this respect: crop yields and the uptake of nutrients by the growing plants were up to four times higher with struvite than with commercially available mineral fertilizers.

The scientists intend to spend the next few months testing the mobile pilot plant at a variety of wastewater treatment plants before starting to commercialize the process in collaboration with industrial partners early next year. "Our process is also suitable for wastewaters from the food-industry and from the production of biogas from agricultural wastes," adds Bilbao. The only prer
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Contact: Jennifer Bilbao
jennifer.bilbao@igb.fraunhofer.de
49-711-970-3646
Fraunhofer-Gesellschaft
Source:Eurekalert  

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