This study investigated the combination of low-thermal and sodium dodecylbenzene sulfonate (SDBS) as a pretreatment method to improve the volatile fatty acids (VFA) production from waste activated sludge (WAS). The results showed that the maximum VFA yield of 320 ± 7.7 mg COD/g VS was obtained in the combined pretreatment (0.01 g SDBS/g TS + 70 °C for 60 min), which was 1.8, 1.7 and 4.0 times of that from sole low-thermal, sole SDBS and the control test. The mechanism study revealed the combined pretreatment had synergetic effect on enhancement of disintegration of WAS. Moreover, low-thermal exhibited greater performance on releasing organic matters, and SDBS accelerated hydrolysis and acidogenesis, thus contributing to the enhancement of VFA production in the combined pretreatment. The microbial community analysis demonstrated that the combined pretreatment increased the abundance of phyla Firmicutes which might be responsible for the improvement of VFA production.

中文翻译：

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通过结合十二烷基苯磺酸钠和低热预处理来提高废活性污泥中发酵性挥发性脂肪酸的生产。

这项研究调查了低热和十二烷基苯磺酸钠（SDBS）的组合作为改善废活性污泥（WAS）产生的挥发性脂肪酸（VFA）的预处理方法。结果表明，联合预处理（0.01 g SDBS / g TS + 70°C，60分钟）的最大VFA产量为320±7.7 mg COD / g VS，分别是其的1.8、1.7和4.0倍唯一的低热量，唯一的SDBS和对照测试。机理研究表明，联合预处理对增强WAS的崩解具有协同作用。此外，低热在释放有机物方面表现出更大的性能，并且SDBS加速了水解和酸生成，因此有助于在联合预处理中提高VFA的产生。