Increasing textile wastewaters and their biotreatment byproduct–waste activated sludge are serious pollution problems. Butyric acid production from textile wastewater sludge by anaerobic digestion at different C/N ratios was investigated. Adding starch to textile wastewater sludge with a C/N ratio of 30 increased the butyric acid concentration and percentage accounting for total volatile fatty acids (TVFAs) to 21.42 g/L and 81.5%, respectively, as compared with 21.42 g/L and 10.6% of textile wastewater sludge alone. The maximum butyric acid yield (0.45 g/g VS), conversion rate (0.74 g/g VSdigest) and production rate (2.25 g/L d) was achieved at a C/N ratio of 30. The biological toxicity of textile wastewater sludge also significantly decreased after the anaerobic digestion. The study indicated that the anaerobic co-digestion of textile wastewater sludge and carbohydrate-rich waste with appropriate C/N ratio is possible for butyric acid production.
Control of C/N ratio for butyric acid production from textile wastewater sludge by anaerobic digestion
Bo Fu, Jingjing Zhang, Jinfeng Fan, Jin Wang, He Liu; Control of C/N ratio for butyric acid production from textile wastewater sludge by anaerobic digestion. Water Sci Technol 1 March 2012; 65 (5): 883–889. doi: https://doi.org/10.2166/wst.2012.919
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