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Plant nutrients from wastewater

Date:
September 7, 2010
Source:
Fraunhofer-Gesellschaft
Summary:
Nitrogen, phosphorus and potassium -- there are valuable nutrients contained in wastewater. Unfortunately, these essential nutrients are lost in conventional wastewater treatment plants. This is the reason why researchers in Germany have been working on processes for regaining these nutrients in the form that can be used for agriculture.
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Nitrogen, phosphorus and potassium -- there are valuable nutrients contained in wastewater. Unfortunately, these essential nutrients are lost in conventional wastewater treatment plants. This is the reason why researchers at Fraunhofer have been working on processes for regaining these nutrients in the form that can be used for agriculture.

They are showcasing their work at Fraunhofer's stand at the IFAT ENTSORGA fair (September 13-17 in Munich, Germany).

Plants cannot thrive without nutrients such as nitrogen, phosphorus or potassium, therefore farmers usually use organic and industrially manufactured mineral fertilizers to supply wheat, maize and others with these vital substances. In future, the need for nutrients will be soaring because we will only be able to supply the world's growing population with food and cover surging demands for biofuels by using fertilizers. Logically, that causes the prices for these nutrients to skyrocket. But that is not the only problem. The deposits of rock phosphates required for manufacturing phosphate fertilizers are becoming increasingly scarce. The researchers at the Fraunhofer Institute for Interfacial Engineering and Biotechnology IGB in Stuttgart, Germany are working at alternatives. They want to recover these essential nutrients from wastewater.

Dr.- Ing. Maria Soledad Stoll points out that "These nutrients are hardly recovered these days." For instance, conventional municipal waste treatment plants use aluminum or ferrous salts to remove the valuable phosphate. Ms. Stoll goes on to say, "However, aluminum and iron phosphate salts can be toxic for plants even in slight concentrations, which is why they cannot be used as fertilizers." The researchers at the Fraunhofer Institute for Interfacial Engineering and Biotechnology are devising alternative methods for recovering the nutrients from the wastewater to use them for agriculture.

"We are working at new methods to recover magnesium-ammonium-phosphate and organic phosphorus from wastewater. The nutrients will then be directly marketed as a fully adequate product and used in agriculture again depending upon the properties of the soils and cultivated plants," says Ms. Stoll.


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The above post is reprinted from materials provided by Fraunhofer-Gesellschaft. Note: Materials may be edited for content and length.


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Fraunhofer-Gesellschaft. "Plant nutrients from wastewater." ScienceDaily. ScienceDaily, 7 September 2010. <www.sciencedaily.com/releases/2010/09/100907113141.htm>.
Fraunhofer-Gesellschaft. (2010, September 7). Plant nutrients from wastewater. ScienceDaily. Retrieved August 29, 2015 from www.sciencedaily.com/releases/2010/09/100907113141.htm
Fraunhofer-Gesellschaft. "Plant nutrients from wastewater." ScienceDaily. www.sciencedaily.com/releases/2010/09/100907113141.htm (accessed August 29, 2015).

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