title: Supercritical water oxidation treatment of textile sludge.
abstract: In this work, we studied the supercritical water oxidation (SCWO) of the textile sludge, the hydrothermal conversion of typical textile compounds and the corrosion properties of stainless steel 316. Moreover, the influence mechanisms of NaOH during these related processes were explored. The results show that decomposition efficiency for organic matter in liquid phase of the textile sludge was improved with the increment of reaction temperature or oxidation coefficient. However, the organic substance in solid phase can be oxidized completely in supercritical water. Serious coking occurred during the high pressure water at 250-450°C for the Reactive Orange 7, while at 300 and 350°C for the polyvinyl alcohol. The addition of NaOH not only accelerated the destruction of organic contaminants in the SCWO reactor, but effectively inhibited the dehydration conversion of textile compounds during the preheating process, which was favorable for the treatment system of textile sludge. The corrosion experiment results indicate that the stainless steel 316 could be competent for the body materials of the reactor and the heat exchangers. Furthermore, there was prominent enhancement of sodium hydroxide for the corrosion resistance of 316 in subcritical water. On the contrary the effect was almost none during SCWO.
authors.affiliation: a State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area (Xi'an University of Technology) , Xi'an , People's Republic of China.
authors.forename: Jie
authors.initials: J
authors.lastname: Zhang
authors.affiliation: b Key Laboratory of Thermo-Fluid Science and Engineering of MOE, School of Energy and Power Engineering of Xi'an Jiaotong University , Xi'an , People's Republic of China.
authors.forename: Shuzhong
authors.initials: S
authors.lastname: Wang
authors.affiliation: b Key Laboratory of Thermo-Fluid Science and Engineering of MOE, School of Energy and Power Engineering of Xi'an Jiaotong University , Xi'an , People's Republic of China.
authors.forename: Yanhui
authors.initials: Y
authors.lastname: Li
authors.affiliation: a State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area (Xi'an University of Technology) , Xi'an , People's Republic of China.
authors.forename: Jinling
authors.initials: J
authors.lastname: Lu
authors.affiliation: a State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area (Xi'an University of Technology) , Xi'an , People's Republic of China.
authors.forename: Senlin
authors.initials: S
authors.lastname: Chen
authors.affiliation: a State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area (Xi'an University of Technology) , Xi'an , People's Republic of China.
authors.forename: XingQi
authors.initials: X
authors.lastname: Luo
mesh_terms: D007220:Industrial Waste; D010084:Oxidation-Reduction; D013783:Textile Industry; D014867:Water; D018508:Water Purification
chemical_list: D007220:Industrial Waste; D014867:Water
keywords: Supercritical water oxidation; char; corrosion; sodium hydroxide; textile sludge