title: Controlling odors from sewage sludge using ultrasound coupled with Fenton oxidation.
abstract: We examined the effects of ultrasound (U), Fenton oxidation (F), and ultrasound coupled with Fenton oxidation (U + F) pre-treatments (prior to anaerobic digestion) on the elimination of odorous compounds. The results demonstrated that U promoted odor release, while the coupled treatment and F alone decreased odor release. After 20-min treatments, the concentration of dissolved sulfide (S(2-)) under the coupled U + F treatment declined from 17.4 mg/L to 8.1 mg/L, decreasing by more than 50% and 34%, respectively, for U alone and F alone. In addition, the dissolved sulfate (SO4(2-)) concentration under couple U + F treatment significantly increased in sewage sludge from 200 mg/L to 390.6 mg/L, up 95.3% compared to U alone and 5% compared to F alone. This illustrates the oxidation process from S(2-) to SO4(2-). Throughout experimentation, SO4(2-) was odorless and stable, highlighting the mechanism of odor control. Thus, combining U and F into a single coupled treatment proved to be a better alternative pretreatment for controlling sludge odor compared to the U and F alone and can effectively decrease potential odor release.
authors.affiliation: School of Environment, Tsinghua University, Beijing 100084, China.
authors.forename: Nuo
authors.initials: N
authors.lastname: Liu
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: Feng
authors.initials: F
authors.lastname: Yan
authors.affiliation: School of Environment, Tsinghua University, Beijing 100084, China.
authors.forename: Sicong
authors.initials: S
authors.lastname: Tian
mesh_terms: D009812:Odorants; D010084:Oxidation-Reduction; D012722:Sewage / Q000737:chemistry*; D013440:Sulfides / Q000032:analysis; D014465:Ultrasonics; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D012722:Sewage; D013440:Sulfides
keywords: Odor control; Sewage sludge; Ultrasound coupled with Fenton oxidation; Waste water treatment plant (WWTP)