- where does food waste best fit in a waste hierarchy? does it have better utility as animal feed or in a localised BSF industry
- what sort of H&MB numbers are going to work at scale, with all that water to remove? is hydrothermal carbonisation a better path for this type of waste stream
- recovering P from our industrial food and sewage systems is important... is biochar production going to become a key player?
1School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
2Shanghai Liming Resources Reuse Co. Ltd., Shanghai 201209, China
*Author to whom correspondence should be addressed.
Received: 14 November 2018 / Accepted: 5 December 2018 / Published: 10 December 2018
Abstract
The disposal of a large amount of biogas residue
from anaerobically digested food waste is a burden for biogas
production. The aim of this work was to investigate biogas residue as a
potential feedstock, by preparing biochar at a broad pyrolysis
temperature range of 400–900 °C. The properties required for phosphorus
recovery and soil amendment application were evaluated. Biogas residue
collected from an urban food waste treatment plant was pyrolyzed in a
laboratory scale reactor. It was found that by increasing the pyrolysis
temperature, the yield of biochar decreased and the pH, electrical
conductivity and Brunauer–Emmett–Teller surface area increased. The
amount of phosphorus adsorbed onto the biogas residue-derived biochar
(BRB) at 900 °C was larger than that of other kinds of biochar. The
kinetics of phosphorus (P) adsorption on BRB could be described by the
pseudo-second-order equation. The pot experiments showed that the
resulting biochar is beneficial for the growth of cabbage. Overall,
turning solid residue from the anaerobic digestion of food waste for
biogas production into biochar shows good prospects as a means of
solving the disposal problem, while creating new markets for food waste
biogas residue.
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