Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

The Influence of Low-Temperature Food Waste Biochars on Anaerobic Digestion of Food Waste

Version 1 : Received: 3 December 2021 / Approved: 6 December 2021 / Online: 6 December 2021 (11:16:52 CET)

How to cite: Świechowski, K.; Białowiec, A.; Matyjewicz, B.; Telega, P. The Influence of Low-Temperature Food Waste Biochars on Anaerobic Digestion of Food Waste. Preprints 2021, 2021120059 (doi: 10.20944/preprints202112.0059.v1). Świechowski, K.; Białowiec, A.; Matyjewicz, B.; Telega, P. The Influence of Low-Temperature Food Waste Biochars on Anaerobic Digestion of Food Waste. Preprints 2021, 2021120059 (doi: 10.20944/preprints202112.0059.v1).

Abstract

The proof-of-the-concept of application of low-temperature food waste biochars for the anaerobic digestion (AD) of food waste (the same substrate) was tested. The concept assumes that residual heat from biogas utilization may be reused for biochar production. Four low-temperature biochars produced under two pyrolytic temperatures 300 °C and 400 °C and under atmospheric and 15 bars pressure with 60 minutes retention time were used. Additionally, the biochar produced during hydrothermal carbonization (HTC) was tested. The work studied the effect of a low biochar dose (0.05 gBC x gTSsubstrate-1, or 0.65 gBC x L-1) on AD batch reactors’ performance. The biochemical methane potential test took 21 days and the process kinetics using the first-order model were determined. The results showed that biochars obtained under 400°C with atmospheric pressure and under HTC conditions improve methane yield by 3.6%. It has been revealed that thermochemical pressure influences the electrical conductivity of biochars. The biomethane was produced with a rate (k) of 0.24 d-1, and the most effective biochars increased the biodegradability of FW to 81% in comparison to variants without biochars (75%).

Keywords

Methane fermentation; biogas; biomethane; biochar; pyrolysis; hydrothermal carbonization; biochemical methane potential; biogas production kinetics

Subject

ENGINEERING, Other

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