title: Control of C/N ratio for butyric acid production from textile wastewater sludge by anaerobic digestion.
abstract: 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 VS(digest)) 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.
authors.affiliation: School of Environmental and Civil Engineering, Jiangnan University, Jiangsu Province, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Fu
authors.forename: Jingjing
authors.initials: J
authors.lastname: Zhang
authors.forename: Jinfeng
authors.initials: J
authors.lastname: Fan
authors.forename: Jin
authors.initials: J
authors.lastname: Wang
authors.forename: He
authors.initials: H
authors.lastname: Liu
mesh_terms: D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D056804:Biofuels / Q000032:analysis; D020148:Butyric Acid / Q000378:metabolism*; D002244:Carbon / Q000032:analysis*; D002734:Chlorophyll / Q000032:analysis; D005232:Fatty Acids, Volatile / Q000032:analysis; D007220:Industrial Waste / Q000032:analysis*; D009584:Nitrogen / Q000032:analysis*; D012722:Sewage / Q000737:chemistry*; D013784:Textiles; D014835:Volatilization; D014865:Waste Disposal, Fluid; D018508:Water Purification / Q000379:methods*
chemical_list: D056804:Biofuels; D005232:Fatty Acids, Volatile; D007220:Industrial Waste; D012722:Sewage; D020148:Butyric Acid; D002734:Chlorophyll; D002244:Carbon; D009584:Nitrogen