{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,27]],"date-time":"2026-03-27T17:46:36Z","timestamp":1774633596886,"version":"3.50.1"},"reference-count":74,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2018,2,27]],"date-time":"2018-02-27T00:00:00Z","timestamp":1519689600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Energies"],"abstract":"<jats:p>The impact of conversion process parameters in pyrolysis (maximum temperature, inert gas flow rate) and hydrothermal carbonization (maximum temperature, residence time and post-washing) on biochar and hydrochar properties is investigated. Pine wood (PW) and corn digestate (CD), with low and high inorganic species content respectively, are used as feedstock. CD biochars show lower H\/C ratios, thermal recalcitrance and total specific surface area than PW biochars, but higher mesoporosity. CD and PW biochars present higher naphthalene and phenanthrene contents, respectively, which may indicate different reaction pathways. High temperatures (&gt;500 \u00b0C) lead to lower PAH (polycyclic aromatic hydrocarbons) content (&lt;12 mg\/kg) and higher specific surface area. With increasing process severity the biochars carbon content is also enhanced, as well as the thermal stability. High inert gas flow rates increase the microporosity and wettability of biochars. In hydrochars the high inorganic content favor decarboxylation over dehydration reactions. Hydrochars show mainly mesoporosity, with a higher pore volume but generally lower specific surface area than biochars. Biochars present negligible availability of NO      3  \u2212     and NH      4  +    , irrespective of the nitrogen content of the feedstock. For hydrochars, a potential increase in availability of NO      3  \u2212    , NH      4  +    , PO      4   3 \u2212     , and K     +     with respect to the feedstock is possible. The results from this work can be applied to \u201cengineer\u201d appropriate biochars with respect to soil demands and certification requirements.<\/jats:p>","DOI":"10.3390\/en11030496","type":"journal-article","created":{"date-parts":[[2018,2,27]],"date-time":"2018-02-27T14:18:08Z","timestamp":1519741088000},"page":"496","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":123,"title":["Towards Biochar and Hydrochar Engineering\u2014Influence of Process Conditions on Surface Physical and Chemical Properties, Thermal Stability, Nutrient Availability, Toxicity and Wettability"],"prefix":"10.3390","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4020-6594","authenticated-orcid":false,"given":"Alba","family":"Dieguez-Alonso","sequence":"first","affiliation":[{"name":"Institute of Energy Engineering, Technische Universit\u00e4t Berlin, Chair for Energy Process Engineering and Conversion Technologies for Renewable Energies, Fasanenstr. 89, 10623 Berlin, Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8425-1346","authenticated-orcid":false,"given":"Axel","family":"Funke","sequence":"additional","affiliation":[{"name":"Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9261-0698","authenticated-orcid":false,"given":"Andr\u00e9s","family":"Anca-Couce","sequence":"additional","affiliation":[{"name":"Institute of Thermal Engineering, Graz University of Technology, Inffeldgasse 25b, 8010 Graz, Austria"}]},{"given":"Alessandro","family":"Rombol\u00e0","sequence":"additional","affiliation":[{"name":"Department of Chemistry \u201cGiacomo Ciamician\u201d, C.I.R.I. Energia Ambiente and C.I.R.S.A., Universit\u00e0 di Bologna, Ravenna Campus, Via S. Alberto 163, 48123 Ravenna, Italy"}]},{"given":"Gerardo","family":"Ojeda","sequence":"additional","affiliation":[{"name":"Ecological and Forestry Applications Research Centre (CREAF), 08193 Cendanyola del Vall\u00e8s, Spain"}]},{"given":"J\u00f6rg","family":"Bachmann","sequence":"additional","affiliation":[{"name":"Institute of Soil Science, Leibniz University of Hannover, Herrenhaeuser Str. 2, 30419 Hannover, Germany"}]},{"given":"Frank","family":"Behrendt","sequence":"additional","affiliation":[{"name":"Institute of Energy Engineering, Technische Universit\u00e4t Berlin, Chair for Energy Process Engineering and Conversion Technologies for Renewable Energies, Fasanenstr. 89, 10623 Berlin, Germany"}]}],"member":"1968","published-online":{"date-parts":[[2018,2,27]]},"reference":[{"key":"ref_1","unstructured":"European Biochar Certificate (EBC) (2012). 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