Cetaqua, Centro Tecnológico del Agua, Los Pozos 7340 Santiago, Chile E-mail:
Aguas Andinas, Gerencia Economía Circular, Presidente Balmaceda 1398 Santiago, Chile.
Water Sci Technol. 2021 Nov;84(9):2530-2540. doi: 10.2166/wst.2021.422.
Co-digestion of thermally pretreated sewage sludge with food waste is an innovative strategy that could improve the balance and availability of nutrients needed to increase the efficiency of anaerobic digestion in terms of biogas production. In this context, the aim of this research was to evaluate the impact of different proportions of sewage sludge/food waste in laboratory- and pilot-scale reactors. Special focus was placed on the impact of the variability of food waste composition on the behaviour of the pilot digester. Our results show that by adding 40% of co-substrate, a higher biogas production was possible during laboratory operation. Interestingly, using a co-substrate of variable composition had no negative impact on the reactor's stability at pilot-scale, promoting an increase in biogas production through a more efficient use of organic matter. In both the lab and pilot experiences there was an impact on the amount of nitrogen in the digestate compared to digester operating in monodigestion. This impact is more significant as the proportion of co-substrate rises. Overall, our results show that co-digestion of thermally pretreated sewage sludge with food waste allows better management of food waste, especially when their composition is variable.
热预处理污水污泥与食物废物的共消化是一种创新策略，可以改善提高沼气生产效率所需的营养物的平衡和可用性。在这种情况下，本研究的目的是评估实验室和中试规模反应器中不同比例的污水污泥/食物废物的影响。特别关注食物废物组成的可变性对中试消化器行为的影响。我们的结果表明，通过添加 40％的共底物，可以在实验室操作中实现更高的沼气产量。有趣的是，使用可变组成的共底物在中试规模上对反应器的稳定性没有负面影响，通过更有效地利用有机物来促进沼气产量的增加。在实验室和中试经验中，与单消化相比，消化物中的氮含量都受到影响。随着共底物比例的增加，这种影响更加显著。总的来说，我们的结果表明，热预处理污水污泥与食物废物的共消化可以更好地管理食物废物，特别是当它们的组成是可变的时候。
