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Characterization and ammonia adsorption of biochar prepared from distillers' grains anaerobic digestion residue with different pyrolysis temperatures
Author(s) -
Zheng Xuebo,
Yang Zhiman,
Xu Xiaohui,
Dai Meng,
Guo Rongbo
Publication year - 2018
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.5340
Subject(s) - biochar , biogas , pyrolysis , adsorption , chemistry , anaerobic digestion , fourier transform infrared spectroscopy , ammonia , residue (chemistry) , nuclear chemistry , methane , chemical engineering , organic chemistry , waste management , engineering
Abstract BACKGROUND Increasing attention is being paid to find an alternative way to handle biogas residue from biogas production which is important for sustainable development of biogas project. In this study, biochars from distillers' grains anaerobic digestion residue (BRC) in the pyrolysis temperature range of 300 to 800°C were prepared. Subsequently, elemental analysis, thermal stability, specific surface area (SSA), scanning electron microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR) and the performance of ammonia (NH 4 + ) adsorption were studied. RESULTS BRC produced at 700°C exhibited the highest SSA (251.47 m 2 g −1 ). Generally, the pH (6.2–8.4), ash (17.58–36.93%), carbon (48.09–56.18%) and the NH 4 + adsorption capacity (1.95–5.86 mg N g −1 ) of BRC increased with increasing pyrolysis temperature (300–700°C). However, for pyrolysis yield (76.39–40.44%), volatile matter (48.72–4.69%), phenolic (0.85–0.01 mmol g −1 ), total acidity (1.39–0.21 mmol g −1 ) and the contribution of H (4.92–1.13%), O (29.41–5.76%), O/C (0.61–0.10), H/C (0.10–0.02), (O+N)/C (0.65–0.13), an opposite trend was found. CONCLUSIONS Pyrolysis temperature has a significant effect on the physicochemical properties of BRC and thus on the quantity of NH 4 + adsorbed. The BRC produced at 700°C could serve as a highly efficient material for NH 4 + removal, therefore presenting a high value‐added application for biogas residues. © 2017 Society of Chemical Industry