Świechowski Kacper, Matyjewicz Bartosz, Telega Paweł, Białowiec Andrzej
Department of Applied Bioeconomy, Wrocław University of Environmental and Life Sciences, 37a Chełmońskiego Str., 51-630 Wrocław, Poland.
Materials (Basel). 2022 Jan 26;15(3):945. doi: 10.3390/ma15030945.
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 min 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 g × g, or 0.65 g × L) 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, and the most effective biochars increased the biodegradability of food waste (FW) to 81% compared to variants without biochars (75%).
对低温食物垃圾生物炭应用于食物垃圾（相同底物）厌氧消化（AD）的概念验证进行了测试。该概念假定沼气利用产生的余热可用于生物炭生产。使用了在300℃和400℃两个热解温度下、在常压和15巴压力下、保留时间为60分钟时产生的四种低温生物炭。此外，还测试了水热碳化（HTC）过程中产生的生物炭。该研究考察了低生物炭剂量（0.05 g×g，或0.65 g×L）对AD间歇式反应器性能的影响。生化甲烷潜力测试历时21天，并使用一级模型确定了过程动力学。结果表明，在400℃、常压和HTC条件下获得的生物炭使甲烷产量提高了3.6%。研究发现，热化学压力会影响生物炭的电导率。生物甲烷产生速率（k）为0.24 d，与无生物炭的变体（75%）相比，最有效的生物炭将食物垃圾（FW）的生物降解率提高到了81%。
