Nutrients and Energy from Waste Liquid Manure Using Vibrating Cup Mill in a Tungsten Carbide Grinding

Introduction - Uses for Liquid Manure

Liquid manure is a waste product naturally generated from mass animal farming. The disposal of liquid manure is a costly process and challenges the concept of recycling management. However, liquid manure can be directly distributed on fields or utilized in biogas plants.

Moreover, the residual solids released from biogas facilities can be also be directly utilized as fertilizers on fields. The presence of magnesium, potassium, phosphorous, and nitrogen makes liquid manure suitable for these applications.

However, liquid manure also contains heavy metals, which are undesirable. Hence, it is necessary to analyze these contents. This article discusses the application of the Vibrating Cup Mill PULVERISETTE 9 from Fritsch to process samples down to analysis fineness.

Analyzing the Metal Content of Manure

At first, the liquid manure is dried at a temperature of 105 °C to produce cake. The resulting cake is then manually crushed and processed using the Vibrating Cup Mill PULVERISETTE 9 in a hard metal tungsten carbide grinding set running at ‘optimal speed’ for 10 seconds. The resulting powder is analytically fine and completely homogenous.

Magnesium, potassium and phosphorous are key nutrients for plants, while heavy metals determined in solids are interfering accompanying elements in accordance with the internal rules of analysis. Nitrogen is detected in the liquid phase.

Conclusion

The Vibrating Cup Mill is ideal for this purpose due to the shorter process duration and the need to clean only very few large parts. The deployment of hard metal tungsten carbide grinding tools excludes the falsification of the heavy metal contents.

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