In a 2019 study by the German Federal Environmental Agency, the result is that conventional fertilizer production in Germany emits about +1.2 kg CO₂ eq/kg P₂O₅. Furthermore, phosphate recovery processes like precipitation (in digested sludge or centrate) or sewage sludge ash also demonstrably cause CO₂ emissions.

In comparison to the global warming potential (GWP) of these processes, PYREG biochar from biosolids has a negative GWP of –4,01 kg CO₂ eq / kg P₂O₅. Consequently, the recovery of phosphate within the PYREG process and the final application of the biochar contributes to fight global warming and reaching net zero.

In addition to that the phosphate recovery rate of PYREG biochar from biosolids is nearly 80 %, which is in the range of other thermal treatments and far better than precipitation processes with <40 % recovery rate.

Sources:
UBA TEXTE 13/2019: Ökobilanzieller Vergleich der P-Rückgewinnung aus dem Abwasserstrom mit der Düngemittelproduktion aus Rohphosphaten unter Einbeziehung von Umweltfolgeschäden und deren Vermeidung, Forschungskennzahl 3716 31 330 0 UBA-FB 002759, ISSN 1862-480
Kratz, Schnug (2009): Zur Frage der Löslichkeit und Pflanzenverfügbarkeit von Phosphor in Düngemitteln JOURNAL FÜR KULTURPFLANZEN, 61 (1). S. 2–8, 2009, ISSN 0027-7479 VERLAG EUGEN ULMER KG, STUTTGART
Koch, Bernhard (2021): Gefäßversuch zur Phosphorverfügbarkeit aus Klärschlammrecyclaten, Landesbetrieb Landwirtschaft Hessen, DPP Forum 2021 Frankfurt
EVS 2019: Experimenteller Nachweis der Cadmiumentfrachtung während des Karbonisierungsprozesses von Klärschlamm
Kuzyakov 2015: Biochar stability in soil: Meta-analysis of decomposition and priming effects, GCB Bioenergy, DOI:10.1111/gcbb.12266
EBI Whitepapaper

Der Beitrag Biochar from biosolids: the climate-positive alternative to conventional phosphorus fertilizer erschien zuerst auf PYREG GmbH.

Der Beitrag PYREG GOES CZECH REPUBLIC: Plant for sewage sludge recycling will soon go into operation erschien zuerst auf PYREG GmbH.

The advantage: Untreated manure such as liquid manure consists largely of water and sometimes contains high concentrations of endocrine disruptors or drug residues. Separation, drying and carbonation drastically reduce the amount of liquid manure and result in a hygienised, dry, storable and transportable recycling fertilizer. In addition, large quantities of CO2 emissions are saved.

Greenhouse trials have already shown that the fertilizing effect of carbon fertilizers is just as good as that of conventional mineral fertilizers. Two field trials with maize near Bingen (Germany) and Bell (Germany) should now confirm these results.

German Television has reported about our project. The report, unfortunately only in German language, can be viewed here in the media library of the SWR.

Der Beitrag MANURE-PROJECT: Recycled carbon fertilizer spread for field trials erschien zuerst auf PYREG GmbH.

→ VIDEO: Impressions from the first joint conference in Baden-Baden, where our first activated carbon plant recently went into operation, can be found here on Youtube.

Der Beitrag VIDEO: Activated Carbon from local biomass waste erschien zuerst auf PYREG GmbH.