Success story: composting
On solid ground
Composting is the biological process of the nutrient cycle during which organic material that is easily recyclable is broken down by bacteria and fungi under the influence of atmospheric oxygen. In the process, other than carbon dioxide water-soluble minerals such as nitrates, ammonium salts, phosphates, and potassium/magnesium compounds that act as a fertilizer are also released. Nowadays, composting is no longer something which only takes place in people's gardens, but is mainly carried out on a large scale by local municipalities. In Germany, more than 1000 composting plants exist for this purpose.
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Task

According to data from the German Federal Statistics Office, in 2011 around 14 million metric tons of biogenic waste was composted or fermented in biogas plants and subsequently re-used on soil in Germany. The German Biowaste Ordinance specifies that the stipulated temperatures for all batches of a composting must be documented. Proof is necessary because dangerous microorganisms are reliably eliminated as a result of the temperature in the material. This data must always be available to the "Bundesgütegemeinschaft Kompost" (Federal Compost Association). The temperature curve must be recorded during hygienic treatment using constant and non-invasive direct temperature measurement in the material being treated. In addition, the temperature must be recorded automatically. Often, this temperature check is carried out manually by the operators of composting plants. The costs for personnel are correspondingly high.

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JUMO Wtrans B being used in a heap
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Solution approach

During composting, a temperature of more than 55 °C must act upon the entire mixture for, if possible, a consecutive period of 2 weeks, or 65 °C over 1 week. The treatment temperature must be measured and documented in regular intervals – at least once per work day. Devices used for temperature measurement must be calibrated regularly – at least once a year – and the calibration must be documented. Only if documentation of the indirect process control is verifiable at any time can the manufactured composts be deemed hygienically harmless. Often, this temperature check is carried out manually by the operators of composting plants. The costs for personnel are correspondingly high. Disposal provider "GfA Lüneburg - gkAöR" has chosen the JUMO mTRON T automation system and JUMO Wtrans B wireless temperature probes. As a result, the process is monitored completely automatically and documented in a tamper-proof manner.

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Composting plant JUMO Wtrans
Antenna of the JUMO Wtrans receiver
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JUMO Wtrans frontal view
JUMO Wtrans solution
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The data no longer has to be recorded manually in a complex undertaking. Instead it is automatically documented and logged as proof of the hygiene certificate. A particularly great advantage has proven to be the minimal effort required for programming and on-site installation.
GfA Lüneburg
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Project outcome

Standard predefined screen masks considerably reduce the startup times for the user. The entire process of temperature monitoring and documentation is now much simpler for GfA Lüneburg thanks to the implemented solution.

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percent obligation to provide proof fulfilled
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Fully automated process
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14
metric tons of biogenic waste are composted in Germany
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