Author:
Liu Shuai,Luo Tao,Liu Guo-hua,Xu Xianglong,Shao Yuting,Qi Lu,Wang Hongchen
Abstract
AbstractLipids in sewage sludge are considered to be high-class raw materials for biodiesel or other valuable products. We profiled the characteristics and assessed the reutilization potential of lipids from different sludge sources, including sludge from the primary sedimentation tank (PST sludge) and sludge from the secondary sedimentation tank in a conventional activated sludge system (CAS sludge), as well as sludge from ultrashort-sludge retention time (SRT) activated sludge systems with different SRTs (USAS sludge, with SRTs of 0.5, 1.0, 2.0, 3.0 and 4.0 d). The results showed that the lipids in the sludges were mainly composed of cellular lipids, free fatty acids (FFAs), wax and gum. The highest lipid content was found in the PST sludge (156.8 ± 11.9 mg/g, dry basis), followed by the USAS sludges (67.9 ± 11.0–132.2 ± 11.8 mg/g) and the CAS sludge (46.0 ± 16.5 mg/g). Lipid species such as Cer, So, PE, PC, and TG were abundant, comprising over 80% of the cellular lipids in the sludges. With higher lipid contents, the PST sludge and USAS sludge (0.5 d SRT) were suggested to have a higher reutilization potential for use in producing biodiesel. In addition, the CAS sludge was promising for resource reutilization and energy recovery due to the large amount of excess sludge.
Funder
National Special Project for Science and Technology on Water Pollution Control and Management
Fundamental Research Funds for the Central Universities, and the Research Funds of Renmin University of China
Publisher
Springer Science and Business Media LLC
Reference42 articles.
1. National Bureau of Statistics. China statistical yearbook on environment-2018 (in Chinese) (China Statistics Press, Beijing, 2019).
2. Hao, X., Zhang, X., Liu, R. & Hu, R. Bottlenecks and breakthroughs of energy conversion from excess sludge (in Chinese). China Water Wastewater, 4 (2014).
3. Li, Y., Chen, T., Luo, W., Huang, Q. & Wu, J. Contents of organic matter and major nutrients and the ecological effect related to land application of sewage sludge in China. Acta Ecol. Sin. 23, 2464–2474 (2003).
4. Mondala, A., Liang, K., Toghiani, H., Hernandez, R. & French, T. Biodiesel production by in situ transesterification of municipal primary and secondary sludges. Biores. Technol. 100, 1203–1210. https://doi.org/10.1016/j.biortech.2008.08.020 (2009).
5. Kargbo, D. M. Biodiesel production from municipal sewage sludges. Energ Fuel 24, 2791–2794. https://doi.org/10.1021/ef1001106 (2010).
Cited by
13 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献