title: Ultrasound coupled with Fenton oxidation pre-treatment of sludge to release organic carbon, nitrogen and phosphorus.
abstract: We focused on the effects of ultrasound and Fenton reagent in ultrasonic coupling Fenton oxidation (U + F) pre-treatment processes on the disintegration of wastewater treatment plant sludge. The results demonstrated that U + F treatment could significantly increase soluble COD, TOC, total N, proteins, total P and PO4(3-) concentrations in sludge supernatant. This method was more effective than ultrasonic (U) or Fenton oxidation (F) treatment alone. U + F treatment increased the soluble COD by 2.1- and 1.4-fold compared with U and F alone, respectively. U + F treatment increased the total N and P by 1.7- and 2.2-fold, respectively, compared with F alone. After U + F treatment, sludge showed a considerably finer particle size and looser microstructure based on scanning electron microscopy, and the highest OH signal intensity increased from 568.7 by F treatment to 1106.3 using electron spin resonance. This demonstrated that U+F treatment induces disintegration of sludge and release of organic carbon, nitrogen and phosphorus better.
authors.affiliation: School of Environment, Tsinghua University, Beijing 100084, China.
authors.forename: Changxiu
authors.initials: C
authors.lastname: Gong
authors.affiliation: School of Environment, Tsinghua University, Beijing 100084, China; Key Laboratory for Solid Waste Management and Environment Safety, Ministry of Education of China, China; Collaborative Innovation Center for Regional Environmental Quality, Tsinghua University, Beijing, China. Electronic address: jianguoj@mail.tsinghua.edu.cn.
authors.forename: Jianguo
authors.initials: J
authors.lastname: Jiang
authors.affiliation: School of Environment, Tsinghua University, Beijing 100084, China.
authors.forename: De'an
authors.initials: D
authors.lastname: Li
mesh_terms: D002244:Carbon / Q000032:analysis*; D006861:Hydrogen Peroxide; D007501:Iron; D009584:Nitrogen / Q000032:analysis*; D010758:Phosphorus / Q000032:analysis*; D012722:Sewage / Q000737:chemistry; D014465:Ultrasonics; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: C045076:Fenton's reagent; D012722:Sewage; D014874:Water Pollutants, Chemical; D010758:Phosphorus; D002244:Carbon; D006861:Hydrogen Peroxide; D007501:Iron; D009584:Nitrogen
keywords: Cooperative effect; Element release; Fenton oxidation; Ultrasound; WWTP sludge