Institute of Hydroscience, Chair of Sanitary Engineering and Waste Management, Bundeswehr University Munich, Neubiberg, Germany.
Water Environ Res. 2023 Sep;95(9):e10918. doi: 10.1002/wer.10918.
Variation of the digester temperature during the year enables the operation of digesters as seasonal heat storage contributing to a holistic heat management at water resource recovery facilities. Full- and lab-scale process data were conducted to examine the effect of the digester temperature on process stability, sludge liquor quality, and dewaterability. Both full- and lab-scale digesters show a stable anaerobic degradation process with a hydraulic retention time of more than 20 days and organic load rates up to 2.2-kg COD/(m ·day) at temperatures between 33 and 53°C. The concentrations of soluble COD and ammonium-nitrogen in the sludge liquor digested at 53°C are 2.6 to 5.8 times and 1.3 times higher, respectively, than in the sludge liquor digested at 37°C. Dewatering tests show an enhancement of the dewaterability but a clear increase in the polymer demand at increased digester temperature. PRACTITIONER POINTS: Digesters can operate as seasonal heat storage within mesophilic and thermophilic temperatures Stable anaerobic degradation process for HRT above 20 days Maintenance of process stability as well as quantity and quality of biogas Increase of soluble COD in sludge liquor at higher temperatures Better dewaterability but higher demand for polymers with increasing temperature.
全年消化池温度的变化使消化池能够作为季节性热储存，有助于水资源回收设施的整体热能管理。进行了全规模和实验室规模的工艺数据，以检查消化池温度对工艺稳定性、污泥液质量和脱水性能的影响。全规模和实验室规模的消化池均显示出稳定的厌氧降解过程，水力停留时间超过 20 天，有机负荷率高达 2.2-2.2 公斤 COD/（m·天），温度在 33 至 53°C 之间。在 53°C 下消化的污泥液中可溶性 COD 和氨氮的浓度分别比在 37°C 下消化的污泥液高 2.6 至 5.8 倍和 1.3 倍。脱水试验表明，随着消化池温度的升高，脱水性能得到提高，但聚合物的需求明显增加。
消化池可以在中温和高温下作为季节性热储存运行
HRT 超过 20 天的稳定厌氧降解过程
维持工艺稳定性以及沼气的数量和质量
高温下污泥液中可溶性 COD 增加
更好的脱水性能，但随着温度的升高，对聚合物的需求更高。
