College of Public Utilities, Jiangsu Urban and Rural Construction College, Changzhou, Jiangsu 213147, China E-mail:
College of Landscape Architecture and Tourism, Hebei Agricultural University, Baoding, Hebei 071001, China.
Water Sci Technol. 2021 Nov;84(9):2519-2529. doi: 10.2166/wst.2021.414.
In order to solve the bottleneck of low methane production in anaerobic codigestion of excess sludge (ES) and plant waste (PW), a new strategy of enhancing hydrolysis and acidification by rhamnolipid (RL) was proposed under thermophilic condition. The results showed that the optimal dosage of RL was 50 g/kg total suspended solids, and the maximum yield of methane was 198.5 mL/g volatile suspended solids (VSS), which was 2.3 times of that in the control. RL promoted the dissolution of organic matter in the codigestion process of ES and PW, and the higher the dosage of RL, the higher the concentration of soluble chemical oxygen demand (SCOD) in the fermentation broth. When RL was 100 g/kg, the maximum content of SCOD in fermentation broth was 2,451 mg/L, and the contents of soluble protein and polysaccharide were 593 mg/L and 419 mg/L on 10 d, respectively, which were significantly higher than other groups. In addition, the yield of VFA in RL group was also significantly increased, and acetate and propionate were the main components of VFAs. This research work provides data support for the resource utilization of ES and PW, and expands the application field of RL.
为了解决剩余污泥（ES）和植物废物（PW）厌氧共消化中甲烷产量低的瓶颈问题，提出了在高温条件下通过鼠李糖脂（RL）增强水解和酸化的新策略。结果表明，RL 的最佳用量为 50 g/kg 总悬浮固体，最大甲烷产量为 198.5 mL/g 挥发性悬浮固体（VSS），是对照组的 2.3 倍。RL 促进了 ES 和 PW 共消化过程中有机物的溶解，RL 的用量越高，发酵液中可溶性化学需氧量（SCOD）的浓度越高。当 RL 用量为 100 g/kg 时，发酵液中 SCOD 的最大含量为 2451 mg/L，第 10 天发酵液中可溶性蛋白质和多糖的含量分别为 593 mg/L 和 419 mg/L，明显高于其他组。此外，RL 组 VFA 的产率也显著增加，其中乙酸和丙酸是 VFA 的主要成分。这项研究工作为 ES 和 PW 的资源利用提供了数据支持，并扩展了 RL 的应用领域。
