Institute of Waste Treatment and Reclamation, Tongji University, Shanghai, 200092, PR China; Shanghai Municipal Engineering Design Institute (Group) Co., Ltd, PR China.
Institute of Waste Treatment and Reclamation, Tongji University, Shanghai, 200092, PR China.
Environ Res. 2022 Nov;214(Pt 4):114136. doi: 10.1016/j.envres.2022.114136. Epub 2022 Aug 20.
Process monitoring is an essential measure to achieve efficient and stable performance in anaerobic digestion, thus requiring identification of effective early warning indicators. However, the application of early warning indicators to full-scale dry anaerobic engineering biogas plant still remains elusive. This study evaluated the effectiveness of common early warning indicators (including CH, CO, HS, volatile fatty acids (VFAs), alkalinity (ALK), total ammonia concentration (TAN) and free ammonia concentration (FAN)) in monitoring the instability of anaerobic digestion process at a practical engineering plant. The results showed that the individual indicators could not provide a sufficient early warning time before the digester fell into failure collapse. In comparison, the coupling indicators (the ratio of CH/CO, CH/pH, and CH/HS) had sensitive response to perturbation, which could regard as a potential early warning indicator, with the early warning time of 6, 7 and 10 days, respectively. Moreover, the VFA/ALK could be used as auxiliary indicators due to the limitation of complex detection methods. In addition, the result also indicated that the application of some warning indicators needs to be further verified, when transferring the result of laboratory scale to the practice application scenarios. This study provides insight into the stable operation of dry anaerobic engineering.
过程监测是实现厌氧消化高效稳定运行的重要手段，因此需要确定有效的预警指标。然而，将预警指标应用于全规模干厌氧工程沼气厂仍然难以实现。本研究评估了常见预警指标（包括 CH、CO、HS、挥发性脂肪酸 (VFAs)、碱度 (ALK)、总氨浓度 (TAN) 和游离氨浓度 (FAN)) 在实际工程中监测厌氧消化过程不稳定性的有效性。结果表明，个别指标在消化池失效崩溃前不能提供足够的预警时间。相比之下，耦合指标（CH/CO、CH/pH 和 CH/HS 的比值）对干扰有敏感的响应，可以作为潜在的预警指标，预警时间分别为 6、7 和 10 天。此外，由于检测方法复杂，VFA/ALK 可作为辅助指标。此外，研究结果还表明，当将实验室规模的结果应用于实际应用场景时，一些预警指标的应用需要进一步验证。本研究为干厌氧工程的稳定运行提供了参考。
