{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,17]],"date-time":"2026-06-17T15:34:41Z","timestamp":1781710481812,"version":"3.54.5"},"reference-count":54,"publisher":"MDPI AG","issue":"16","license":[{"start":{"date-parts":[[2020,8,11]],"date-time":"2020-08-11T00:00:00Z","timestamp":1597104000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Polish National Research Center, Preludium 6","award":["The influence of sewage sludge torrefaction on biocarbon phytotoxicity, leachability of heavy metals from biocarbon and sorption parameters of biocarbon"],"award-info":[{"award-number":["The influence of sewage sludge torrefaction on biocarbon phytotoxicity, leachability of heavy metals from biocarbon and sorption parameters of biocarbon"]}]},{"name":"Iowa Agriculture and Home Economics Experiment Station","award":["Project no. IOW05556 (Future Challenges in Animal Production Systems: Seeking Solutions through Focused Facilitation) sponsored by Hatch Act & State of Iowa funds"],"award-info":[{"award-number":["Project no. IOW05556 (Future Challenges in Animal Production Systems: Seeking Solutions through Focused Facilitation) sponsored by Hatch Act & State of Iowa funds"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>Improved technologies are needed for sustainable management of sewage sludge (SS). The torrefaction (also known as biomass \u201croasting\u201d) is considered a pretreatment of SS before use in agriculture. However, it is not known whether the torrefaction has the potential to decrease heavy metals\u2019 (HMs) leachability and the SS toxicity. Thus, the aim of the study was to evaluate the influences of the SS torrefaction parameters (temperature and process time) on HM contents in biochar, HM leachability, and biochar toxicity, and compare them with raw SS. The experiments were designed in 18 combinations (six temperatures, 200, 220, 240, 260, 280, and 300 \u00b0C; and three process times\u201420, 40, 60 min). Standard tests were used to determine HMs content, leachability, and toxicity. Results indicated that the torrefaction did not increase (p &lt; 0.05) the HM content in comparison to the raw SS. The leachability of Zn, Ni, Cu, Cr, and Mn from SS biochars was similar to raw SS. However, the degree of leachability varied significantly (p &lt; 0.05) from as low as 0.1% for Cu to high as 16.7% for Cd. The leachability of Cd (&lt;16.7%) and Pb (&lt;11.9%) from biochars was higher than from raw SS (&lt;6.1% and &lt;2.4%, respectively). The leachability of Cd from SS biochar, in five torrefaction combinations, was higher than the threshold value for hazardous waste. It is recommended that site-specific decisions are made for torrefaction of SS with respect to its HM content, as the resulting biochar could be considered as hazardous waste, depending on the feedstock. Moreover, the biochar produced under the whole range of temperatures during 20 min retention time significantly (p &lt; 0.05) increased the Daphnia magna Straus mobility inhibition by up to 100% in comparison to the biochar obtained during 40 and 60 min torrefaction. Taking into account the increased leachability of specific HMs and D. magna Straus mobility inhibition, biochar should be considered a potentially hazardous material. Future research should focus on biochar dosage as a fertilizer in relation to its toxicity. Additional research is warranted to focus on the optimization of SS torrefaction process parameters affecting the toxicity.<\/jats:p>","DOI":"10.3390\/ma13163544","type":"journal-article","created":{"date-parts":[[2020,8,11]],"date-time":"2020-08-11T09:28:57Z","timestamp":1597138137000},"page":"3544","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["Is Biochar from the Torrefaction of Sewage Sludge Hazardous Waste?"],"prefix":"10.3390","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5871-2129","authenticated-orcid":false,"given":"Andrzej","family":"Bia\u0142owiec","sequence":"first","affiliation":[{"name":"Institute of Agricultural Engineering, 37a Che\u0142mo\u0144skiego Str., Faculty of Life Sciences and Technology, Wroclaw University of Environmental and Life Sciences, 51-630 Wroclaw, Poland"},{"name":"Department of Agricultural and Biosystems Engineering, 4350 Elings Hall, Iowa State University, Ames, IA 50011, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6438-3608","authenticated-orcid":false,"given":"Jakub","family":"Pulka","sequence":"additional","affiliation":[{"name":"Faculty of Agronomy and Bioengineering, 28 Wojska Polskiego Str., Poznan University of Life Sciences, 60-637 Pozna\u0144, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marzena","family":"Styczy\u0144ska","sequence":"additional","affiliation":[{"name":"Faculty of Biotechnology and Food Sciences, 37 Che\u0142mo\u0144skiego Str., Wroclaw University of Environmental and Life Sciences, 51-630 Wroclaw, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2387-0354","authenticated-orcid":false,"given":"Jacek A.","family":"Koziel","sequence":"additional","affiliation":[{"name":"Department of Agricultural and Biosystems Engineering, 4350 Elings Hall, Iowa State University, Ames, IA 50011, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joanna","family":"Kalka","sequence":"additional","affiliation":[{"name":"Faculty of Energy and Environmental Engineering, Environmental Biotechnology Department, The Silesian University of Technology, 2 Akademicka Str., 44-100 Gliwice, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marcelina","family":"Jureczko","sequence":"additional","affiliation":[{"name":"Faculty of Energy and Environmental Engineering, Environmental Biotechnology Department, The Silesian University of Technology, 2 Akademicka Str., 44-100 Gliwice, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ewa","family":"Felis","sequence":"additional","affiliation":[{"name":"Faculty of Energy and Environmental Engineering, Environmental Biotechnology Department, The Silesian University of Technology, 2 Akademicka Str., 44-100 Gliwice, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4067-8556","authenticated-orcid":false,"given":"Piotr","family":"Manczarski","sequence":"additional","affiliation":[{"name":"Faculty of Building Services, Hydro and Environmental Engineering, Department of Environmental Engineering, 20 Nowowiejska Str., Warsaw University of Technology, 00-653 Warszawa, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2020,8,11]]},"reference":[{"key":"ref_1","first-page":"387","article-title":"Biochar as a response to current environmental problems","volume":"Volume 15","author":"Malinska","year":"2012","journal-title":"Engineering and Environmental Protection"},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Pawlak-Kruczek, H., Wnukowski, M., Niedzwiecki, L., Czerep, M., Kowal, M., Krochmalny, K., Zg\u00f3ra, J., Ostrycharczyk, M., Baranowski, M., and Tic, W.J. 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