Intermittent mixing facilitates energy recovery and low carbon emissions from high-solids anaerobic co-digestion of food waste and sewage sludge

IF 6.7 2区环境科学与生态学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Environmental Technology & Innovation Pub Date : 2023-08-19 DOI:10.1016/j.eti.2023.103339

Lili Li, Qingwei Gao, Kun Wang, Qingliang Zhao, Huimin Zhou, Junqiu Jiang, Wangyang Mei

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Abstract

Mixing inside high-solids anaerobic co-digestion (HS-AcoD) is essential for process feasibility and economic sustainability. This study developed a proper energy assessment for a high solids anaerobic digestion-combined heat and power (AD-CHP) system to clarify the impact of mixing on methane production, energy recovery and carbon emission reduction during HS-AcoD of food waste (FW) and sewage sludge (SS). Results indicated that intermittent mixing enhanced methane production and shortened the lag phase compared with unmixing and continuous mixing. The modified Gompertz model yielded better fitting than the logistic and transfer function models via kinetic analysis. In the case of a scaled-up AD-CHP system, intermittent mixing with 15 min/h boosted energy output (2.14 × 10³ kWh/tonne VS) at 21 d. Compared with continuous mixing, 15 min/h intermittent mixing at 13 d improved the energy recovery ratio from 31% to 45% and carbon emissions reduction from 0.25 t CO₂/t VS to 0.35 t CO₂/t VS. For a high availability of FW and SS in China, the AD-CHP system with intermittent mixing would have higher net energy output (128.4 × 10⁹ kWh) and carbon emission reduction (15.3 million tonnes) by the full utilization of these biomasses. These results are expected to provide theoretical support for the high solids AD-CHP system in determining the optimal mixing strategy with maximum energy production for FW and SS disposal.

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间歇混合有利于食物垃圾和污水污泥高固体厌氧共消化的能量回收和低碳排放

在高固体厌氧共消化（HS-AcoD）中混合对工艺可行性和经济可持续性至关重要。本研究为高固体厌氧消化热电联产（AD-CHP）系统开发了一个适当的能量评估，以阐明混合对食物垃圾（FW）和污水污泥（SS）的HS AcoD过程中甲烷生产、能量回收和碳减排的影响。结果表明，与未混合和连续混合相比，间歇混合提高了甲烷产量，缩短了滞后期。通过动力学分析，改进的Gompertz模型比逻辑和传递函数模型产生了更好的拟合。在规模扩大的AD-CHP系统的情况下，15分钟/小时的间歇混合提高了21天的能量输出（2.14×103千瓦时/吨VS）。与连续混合相比，13天的15分钟/h间歇混合将能量回收率从31%提高到45%，并将碳排放量从0.25吨二氧化碳/吨VS降低到0.35吨二氧化碳/t VS。为了在中国实现FW和SS的高可用性，间歇混合的AD-CHP系统通过充分利用这些生物质将具有更高的净能量输出（128.4×109kWh）和碳减排（1530万吨）。这些结果有望为高固体AD-CHP系统确定FW和SS处理的最佳混合策略提供理论支持。

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来源期刊

Environmental Technology & Innovation Environmental Science-General Environmental Science

CiteScore

14.00

自引率

4.20%

发文量

435

审稿时长

74 days

期刊介绍： Environmental Technology & Innovation adopts a challenge-oriented approach to solutions by integrating natural sciences to promote a sustainable future. The journal aims to foster the creation and development of innovative products, technologies, and ideas that enhance the environment, with impacts across soil, air, water, and food in rural and urban areas. As a platform for disseminating scientific evidence for environmental protection and sustainable development, the journal emphasizes fundamental science, methodologies, tools, techniques, and policy considerations. It emphasizes the importance of science and technology in environmental benefits, including smarter, cleaner technologies for environmental protection, more efficient resource processing methods, and the evidence supporting their effectiveness.