title: A new insight into resource recovery of excess sewage sludge: feasibility of extracting mixed amino acids as an environment-friendly corrosion inhibitor for industrial pickling.
abstract: The work mainly presented a laboratory-scale investigation on an effective process to extract a value-added product from municipal excess sludge. The functional groups in the hydrolysate were characterized with Fourier transform infrared spectrum, and the contained amino acids were measured by means of an automatic amino acid analyzer. The corrosion-inhibition characteristics of the hydrolysate were determined with weight-loss measurement, electrochemical polarization and scanning electron microscopy. Results indicated that the hydrolysate contained 15 kinds of amino acid, and their adsorption on the surface could effectively inhibit the corrosion reaction of the steel from the acid medium. Polarization curves indicated that the obtained hydrolysate was a mixed-type inhibitor, but mainly restricted metal dissolution on the anode. The adsorption accorded well with the Langmuir adsorption isotherm, involved an increase in entropy, and was a spontaneous, exothermic process.
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, No. 100, Waihuan Xi Road, 510006 Guangzhou, PR China.
authors.forename: Wen
authors.initials: W
authors.lastname: Su
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, No. 100, Waihuan Xi Road, 510006 Guangzhou, PR China. Electronic address: renytang@163.com.
authors.forename: Bing
authors.initials: B
authors.lastname: Tang
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, No. 100, Waihuan Xi Road, 510006 Guangzhou, PR China.
authors.forename: Fenglian
authors.initials: F
authors.lastname: Fu
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, No. 100, Waihuan Xi Road, 510006 Guangzhou, PR China.
authors.forename: Shaosong
authors.initials: S
authors.lastname: Huang
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, No. 100, Waihuan Xi Road, 510006 Guangzhou, PR China.
authors.forename: Shiyuan
authors.initials: S
authors.lastname: Zhao
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, No. 100, Waihuan Xi Road, 510006 Guangzhou, PR China.
authors.forename: Liying
authors.initials: L
authors.lastname: Bin
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, No. 100, Waihuan Xi Road, 510006 Guangzhou, PR China.
authors.forename: Jiewei
authors.initials: J
authors.lastname: Ding
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, No. 100, Waihuan Xi Road, 510006 Guangzhou, PR China.
authors.forename: Cuiqun
authors.initials: C
authors.lastname: Chen
mesh_terms: D000596:Amino Acids / Q000737:chemistry* / Q000302:isolation & purification*; D004563:Electrochemistry; D004787:Environmental Pollution / Q000517:prevention & control; D005240:Feasibility Studies; D005525:Food-Processing Industry; D006868:Hydrolysis; D008855:Microscopy, Electron, Scanning; D012722:Sewage / Q000032:analysis*; D017550:Spectroscopy, Fourier Transform Infrared; D013816:Thermodynamics
chemical_list: D000596:Amino Acids; D012722:Sewage
keywords: Corrosion inhibition characteristic; Excess sludge; Green corrosion inhibitor; Ultrasonic-assisted hydrochloric acid-hydrothermal process; Volume reduction