title: A rapid and low energy consumption method to decolorize the high concentration triphenylmethane dye wastewater: operational parameters optimization for the ultrasonic-assisted ozone oxidation process.
abstract: This research set up an ultrasonic-assisted ozone oxidation process (UAOOP) to decolorize the triphenylmethane dyes wastewater. Five factors - temperature, initial pH, reaction time, ultrasonic power (low frequency 20 kHz), and ozone concentration - were investigated. Response surface methodology was used to find out the major factors influencing color removal rate and the interactions between these factors, and optimized the operating parameters as well. Under the experimental conditions: reaction temperature 39.81 °C, initial pH 5.29, ultrasonic power 60 W and ozone concentration 0.17 g/L, the highest color removals were achieved with 10 min reaction time and the initial concentration of the MG solution was 1000 mg/L. The optimal results indicated that the UAOOP was a rapid, efficient and low energy consumption technique to decolorize the high concentration MG wastewater. The predicted model was approximately in accordance with the experimental cases with correlation coefficients R(2) and R(adj)(2) of 0.9103 and 0.8386.
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, PR China.
authors.forename: Xian-Jiao
authors.initials: XJ
authors.lastname: Zhou
authors.forename: Wan-Qian
authors.initials: WQ
authors.lastname: Guo
authors.forename: Shan-Shan
authors.initials: SS
authors.lastname: Yang
authors.forename: Nan-Qi
authors.initials: NQ
authors.lastname: Ren
mesh_terms: D001709:Biotechnology / Q000379:methods*; D004396:Coloring Agents / Q000737:chemistry*; D004563:Electrochemistry / Q000379:methods; D006863:Hydrogen-Ion Concentration; D015233:Models, Statistical; D010100:Oxygen / Q000737:chemistry*; D010126:Ozone / Q000737:chemistry*; D012394:Rosaniline Dyes / Q000737:chemistry; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D014320:Triphenylmethyl Compounds / Q000032:analysis*; D014465:Ultrasonics; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods*
chemical_list: D004396:Coloring Agents; D012394:Rosaniline Dyes; D014320:Triphenylmethyl Compounds; D014874:Water Pollutants, Chemical; C005095:malachite green; D010126:Ozone; C046945:triphenylmethane; D010100:Oxygen