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The Scientific World Journal
Volume 2015 (2015), Article ID 479101, 5 pages
Research Article

Enhancement of Anaerobic Digestion to Treat Saline Sludge from Recirculating Aquaculture Systems

1College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, China
2Shanghai Collaborative Innovation Center for Aquatic Animal Genetics and Breeding, Shanghai 201306, China
3Research and Development Center of Aquacultural Engineering of Shanghai, Shanghai 201306, China

Received 10 January 2015; Accepted 20 May 2015

Academic Editor: Adriano M. Bernardin

Copyright © 2015 Guo-zhi Luo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The effectiveness of carbohydrate addition and the use of ultrasonication as a pretreatment for the mesophilic anaerobic digestion of saline aquacultural sludge was assessed. Analyses were conducted using an anaerobic sequencing batch reactor (ASBR), which included stopped gas production attributed to the saline inhibition. After increasing the C : N ratio, gas production was observed, and the total chemical oxygen demand (TCOD) removal efficiency increased from 75% to 80%. The TCOD removal efficiency of the sonication period was approximately 85%, compared to 75% for the untreated waste. Ultrasonication of aquaculture sludge was also found to enhance the gas production rate and the TCOD removal efficiency. The average volatile fatty acid (VFA) to alkalinity ratios ranged from 0.1 to 0.05, confirming the stability of the digesters. Furthermore, soluble chemical oxygen demand (SCOD), VFA, and concentrations increased in the effluents. There was a 114% greater gas generation during the ultrasonication period, with an average production of 0.08 g COD/L·day−1.