Abstract

The requirements for enhanced technologies, such as pyrolysis and anaerobic digestion, are crucial to improve food waste and sewage sludge and address the difficulty in disposing of hardly biodegradable residues. The pyrolysis process was applied to two waste streams, namely hardly biodegradable residues and sewage sludge, at 500 °C with a heating rate of 25 °C min⁻¹ to obtain hardly biodegradable residues biochar (DBR-Char) and sewage sludge biochar (SS-Char). The two biochars were then used as additives during anaerobic digestion of food waste treatment to enhance biogas production and reactor robustness to achieve average methane contents in biogas up to 75% compared with the control. Biochar addition also improved process stability, with the Methanosaeta/Methanothrix 99.55% in the CK1 (reactor with inoculum, food waste, and DBR-Char) and 98.13% in the CK2 (reactor with inoculum, food waste, and SS-Char) as the dominant genera among the anaerobic consortia. This study averted the hardly biodegradable residues and sewage sludge disposal challenges via pyrolysis and offered biochar utilization to promote reactor stability and biogas production in food waste fermentation.

Graphic abstract

中文翻译：

---

食品垃圾厌氧消化中的热解废物流及生物炭性能评估

摘要

对诸如热解和厌氧消化之类的增强技术的要求，对于改善食物垃圾和污水污泥并解决难以处理的生物降解性残留物的处理至关重要。在500°C和25°C min ^-1的加热速率下，将热解工艺应用于两种废物流，即难以生物降解的残留物和污水污泥，以获得难生物降解的残留物生物炭（DBR-Char）和污水污泥生物炭（SS -Char）。然后，在食物垃圾处理的厌氧消化过程中，将这两种生物炭用作添加剂，以提高沼气产量和反应器的坚固性，与对照相比，沼气中的平均甲烷含量最高可达75％。使用甲烷菌/甲烷甲oth，生物炭的添加还改善了工艺稳定性。在厌氧菌群中，CK1（带接种物，食物垃圾和DBR-Char的反应器）占99.5％，而CK2（带接种物，食物垃圾和SS-Char的反应器）占98.13％。这项研究避免了热解过程中难以降解的残留物和污水污泥的处理难题，并提供了生物炭利用，以提高反应堆的稳定性和食物垃圾发酵中沼气的产生。

图形摘要