title: Effect of K2FeO4/US treatment on textile dyeing sludge disintegration and dewaterability.
abstract: The effect of potassium ferrate/ultrasonic (K2FeO4/US) treatment on the physicochemical features of textile dyeing sludge was studied. The soluble chemical oxygen demand (SCOD), deoxyribonucleic acid (DNA), sludge volume index (SVI), sludge viscosity, capillary suction time (CST) and particle size were measured to understand the observed changes in the sludge physicochemical features. The results showed that the combined K2FeO4/US treatment presented great advantages for disrupting the sludge floc structure over K2FeO4 or ultrasonic treatments alone. The optimal parameters of sludge disintegration were found to be a K2FeO4 treatment time of 60 min, a K2FeO4 dosage of 0.5936 g/g SS, an ultrasonic time of 15 min and an ultrasonic intensity of 0.72 W/mL. The initial median diameter of the sludge particles was 15.24 μm, and this value decreased by 35.89%. The CST was initially 59.6 s and increased by 231%, whereas the SVI was 97.78 mL/g and decreased by 25.89%. Scanning electron microscope (SEM) images indicated that the sludge surface was irregular and loose with a large amount of channels or voids during K2FeO4/US treatment. K2FeO4/US treatment synergistically enhanced the sludge solubilization and reached 668.67 mg/L SCOD, which is 31.81% greater than the additive value obtained with K2FeO4 treatment alone (215.95 mg/L) or with ultrasonic treatment alone (240 mg/L).
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China. Electronic address: ningxunan666@126.com.
authors.forename: Xun-an
authors.initials: XA
authors.lastname: Ning
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
authors.forename: Yinfang
authors.initials: Y
authors.lastname: Feng
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
authors.forename: Junji
authors.initials: J
authors.lastname: Wu
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
authors.forename: Changmin
authors.initials: C
authors.lastname: Chen
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
authors.forename: Yujie
authors.initials: Y
authors.lastname: Wang
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Sun
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
authors.forename: Kenlin
authors.initials: K
authors.lastname: Chang
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
authors.forename: Yaping
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
authors.forename: Zuoyi
authors.initials: Z
authors.lastname: Yang
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
authors.forename: Jingyong
authors.initials: J
authors.lastname: Liu
mesh_terms: D057919:Biological Oxygen Demand Analysis; D004396:Coloring Agents / Q000737:chemistry; D007220:Industrial Waste; D058085:Iron Compounds / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D010316:Particle Size; D017680:Potassium Compounds / Q000737:chemistry*; D012722:Sewage / Q000737:chemistry*; D013784:Textiles; D014465:Ultrasonics / Q000379:methods*; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D004396:Coloring Agents; D007220:Industrial Waste; D058085:Iron Compounds; D017680:Potassium Compounds; D012722:Sewage; C044384:potassium ferrate
keywords: Dewaterability; Disintegration; Potassium ferrate; Textile dyeing sludge; Ultrasonic