Guangzhou Sewage Purification Co., Ltd, Guangzhou 510655, China; These authors contributed equally to this work.
School of Mathematics and Information, Guangzhou University, Guangzhou 510006, China; These authors contributed equally to this work.
Water Sci Technol. 2024 Jul;90(1):303-313. doi: 10.2166/wst.2024.210. Epub 2024 Jun 17.
The composition of waste-activated sludge (WAS) is complex, containing a large amount of harmful substances, which pose a threat to the environment and human health. The reduction and resource utilization of sludge has become a development demand in sludge treatment and disposal. Based on the technical bottlenecks in the practical application of direct anaerobic digestion technology, this study adopted two different thermal and thermal-alkali hydrolysis technologies to pretreat sludge. A pilot-scale experiment was conducted to investigate the experimental conditions, parameters, and effects of two hydrolysis technologies. This study showed that the optimal hydrolysis temperature was 70 °C, the hydrolysis effect and pH can reach equilibrium with the hydrolysis retention time was 4-8 h, and the optimal alkali concentration range was 0.0125-0.015 kg NaOH/kg dry-sludge. Thermal-alkali combination treatment greatly improved the performance of methane production, the addition of NaOH increased methane yield by 31.2% than that of 70 °C thermal hydrolysis. The average energy consumption is 75 kWh/m 80% water-content sludge during the experiment. This study provides a better pretreatment strategy for exploring efficient anaerobic digestion treatment technologies suitable for southern characteristic sewage sludge.
剩余污泥（WAS）的组成复杂，含有大量有害物质，对环境和人体健康构成威胁。减少污泥量并实现资源再利用已成为污泥处理和处置的发展需求。本研究针对直接厌氧消化技术在实际应用中的技术瓶颈，采用两种不同的热和热碱水解技术对污泥进行预处理。通过中试实验，研究了两种水解技术的实验条件、参数和效果。研究表明，最佳水解温度为 70°C，水解效果和 pH 值在水解停留时间为 4-8 h 时达到平衡，最佳碱浓度范围为 0.0125-0.015 kg NaOH/kg 干污泥。热碱联合处理大大提高了甲烷生产性能，NaOH 的添加使甲烷产量比 70°C 热水解提高了 31.2%。实验过程中的平均能耗为 75 kWh/m 80%含水率的污泥。本研究为探索适合南方特色污水污泥的高效厌氧消化处理技术提供了更好的预处理策略。
