Sludge pretreatment plays a crucial role in solubilizing particulate matters to release organic matter for subsequent anaerobic fermentation (AF). This study innovatively combines radio frequency (RF) heating and alkaline treatment, and finds that the combined pretreatment achieved a sludge disintegration rate of 35.11 %, which is 15.19 % and 8.48 % higher than single RF or alkaline pretreatment. The dissociated ions from the alkali are conducive to RF action on sludge. Furthermore, the combined pretreatment significantly benefits the subsequent AF experiments, resulting in a 9-fold increase in volatile fatty acids production. Considering cost-effectiveness, the optimal operating condition is a 10-minute RF treatment at pH 10 with a total cost of 4.35 × 10-3 dollars per kg soluble chemical oxygen demand (SCOD) increased. These findings provide a foundational basis for the development of a novel technology for sludge pretreatment.

中文翻译：

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射频加热与碱处理相结合，增强污泥分解和厌氧发酵挥发性脂肪酸的产生


污泥预处理对于溶解颗粒物以释放有机物以用于后续厌氧发酵（AF）起着至关重要的作用。本研究创新性地将射频加热与碱处理相结合，发现联合预处理的污泥解体率达到35.11%，比单一射频或碱预处理分别提高了15.19%和8.48%。碱解离的离子有利于射频作用于污泥。此外，联合预处理显着有利于后续的 AF 实验，使挥发性脂肪酸的产量增加了 9 倍。考虑到成本效益，最佳操作条件是在pH 10下进行10分钟的射频处理，每增加1kg可溶性化学需氧量（SCOD）总成本为4.35×10-3美元。这些发现为污泥预处理新技术的开发奠定了基础。