College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China.
Appl Biochem Biotechnol. 2013 Nov;171(6):1416-28. doi: 10.1007/s12010-013-0439-0. Epub 2013 Aug 18.
The effect of biosurfactant rhamnolipid (RL) on hydrolysis and acidification of waste activated sludge (WAS) was investigated. The results indicated that RL could greatly reduce the surface tension of sludge, resulting in stimulating the hydrolysis rate of WAS and enhancing the production of short-chain fatty acids (SCFAs). With the increase of RL dosage from 0.2 to 0.5 g/g DS, the maximum soluble chemical oxygen demand (SCOD), protein and carbohydrate concentration increased correspondingly. After 6 h of hydrolysis, SCOD, protein and carbohydrate concentration increased from 371.9, 93.3 and 9.0 mg/l to 3,994.5, 800.0 and 401.4 mg/l at RL 0.3 g/g DS, respectively. Furthermore, the release of NH4 (+)-N, PO4 (3-)-P and the accumulation of SCFAs also improved in the presence of RL. The maximum SCFAs was 1,829.9 mg COD/l at RL 0.3 g/g DS, while it was only 377.7 mg COD/l for the blank test. The propionic acid and acetic acid were the mainly SCFAs produced, accounting for 50-60% of total SCFAs.
研究了生物表面活性剂鼠李糖脂（RL）对废活性污泥（WAS）水解和酸化的影响。结果表明，RL 能显著降低污泥的表面张力，从而刺激 WAS 的水解速率，并增强短链脂肪酸（SCFAs）的生成。随着 RL 用量从 0.2 增加到 0.5 g/g DS，最大可溶化学需氧量（SCOD）、蛋白质和碳水化合物浓度相应增加。水解 6 h 后，RL 用量为 0.3 g/g DS 时，SCOD、蛋白质和碳水化合物浓度分别从 371.9、93.3 和 9.0 mg/L 增加到 3,994.5、800.0 和 401.4 mg/L。此外，RL 的存在也改善了 NH4 (+)-N、PO4 (3-)-P 的释放和 SCFAs 的积累。在 RL 用量为 0.3 g/g DS 时，最大 SCFAs 为 1,829.9 mg COD/L，而空白试验仅为 377.7 mg COD/L。丙酸和乙酸是主要的 SCFAs，占总 SCFAs 的 50-60%。
