Department of Chemical Engineering and Analytical Chemistry, University of Barcelona, 08028 Barcelona, Spain.
Department of Chemical Engineering and Analytical Chemistry, University of Barcelona, 08028 Barcelona, Spain.
Bioresour Technol. 2021 Jun;330:124978. doi: 10.1016/j.biortech.2021.124978. Epub 2021 Mar 14.
The implementation of anaerobic membrane bioreactor as mainstream technology would reduce the load of sidestream anaerobic digesters. This research evaluated the techno-economic implications of co-digesting sewage sludge and food waste in such wastewater treatment plants to optimise the usage of the sludge line infrastructure. Three organic loading rates (1.0, 1.5 and 2.0 kg VS m d) and different strategies to manage the additional nutrients backload were considered. Results showed that the higher electricity revenue from co-digesting food waste offsets the additional costs of food waste acceptance infrastructure and biosolids disposal. However, the higher electricity revenue did not offset the additional costs when the nutrients backload was treated in the sidestream (partial-nitritation/anammox and struvite precipitation). Biosolids disposal was identified as the most important gross cost contributor in all the scenarios. Finally, a sensitivity analysis showed that food waste gate fee had a noticeable influence on co-digestion economic feasibility.
采用厌氧膜生物反应器作为主流技术可以减轻侧流厌氧消化器的负担。本研究评估了在这些污水处理厂中协同消化污水污泥和食物垃圾的技术经济影响，以优化污泥处理基础设施的使用。考虑了三种有机负荷率（1.0、1.5 和 2.0 kg VS m d）和不同的策略来管理额外的营养物回流。结果表明，协同消化食物垃圾所产生的更高的电力收入抵消了接受食物垃圾基础设施和生物固体处置的额外成本。然而，当在侧流中处理营养物回流（部分硝化/厌氧氨氧化和鸟粪石沉淀）时，更高的电力收入并没有抵消额外的成本。生物固体处置是所有方案中最重要的总费用贡献者。最后，敏感性分析表明，食物垃圾入场费对协同消化的经济可行性有显著影响。
