Li Yang
Associate Professor Supervisor of Master's Candidates
Main positions:Assistant Professor
Gender:Female
Alma Mater:Dalian University of Technology
Degree:Doctoral Degree
School/Department:School of Ocean Science and Technology
Discipline:Environmental Engineering
Business Address:D06-309
Contact Information:liyang1989@dlut.edu.cn
E-Mail:liyang1989@dlut.edu.cn
Hits:
Indexed by:Journal Papers
Date of Publication:2020-12-29
Journal:CHEMICAL ENGINEERING JOURNAL
Volume:393
ISSN No.:1385-8947
Key Words:Microbial sulphur cycle; Chemolithotrophic sulphur-oxidizing bacteria; Phenol degradation; Cr(VI) reduction; Fe(III)/Fe(II) transformation
Abstract:Microbial sulphur cycle is of great importance to anaerobic degradation of organic pollutants coupled with metal reduction, which however is usually limited by the poor oxidation of the elemental sulphur to sulphate, due to the lack of chemolithotrophic sulphur-oxidizing bacteria. The study presented here utilized magnetite as an Fe (III) source to enrich the chemolithotrophic sulphur-oxidizing bacteria to proceed the oxidation of the elemental sulphur, which further achieved the whole sulphur cycle. The results showed that, under the low-concentration sulphate conditions, the effluent concentration of both Cr(VI) (18.0 mg/L vs 187.7 mg/L) and phenol (354.2 mgCOD/L vs 1256.0 mgCOD/L) in the reactor with magnetite was significantly lower than that without magnetite. Energy-dispersive X-ray (EDX) analysis showed that the content of sulphur in the aggregates without magnetite was lower than that with magnetite (4.49% vs 6.85%). Conversely, with magnetite, the special enrichments, Thiobacillus species, proceeded the oxidation of the elemental sulphur to sulphate, lowering the loss of sulphur. Further analysis by X-ray Diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) observed the disappearance of the crystalline structure in magnetite as well as the loss of iron via the dissimilatory Fe(III) reduction in the aggregates. However, under the sulphate-reducing conditions, the evident peaks of both Fe2O3 and FeO were detected in the aggregates. Considered that the re-oxidation of the reduced Cr(III) might occur in the aggregates without magnetite, the generated Fe(II) might react with the slight dissolved oxygen (DO) to reduce the re-oxidation of the reduced Cr(III), which further achieved the transformation of Fe(III)/Fe(II).
Pre One:Synchronously improving intracellular electron transfer in electron-donating bacteria and electron-accepting methanogens for facilitating direct interspecies electron transfer during anaerobic digestion of kitchen wastes
Next One:Ferroferric oxide triggered possible direct interspecies electron transfer between Syntrophomonas and Methanosaeta to enhance waste activated sludge anaerobic digestion.
副教授，硕士生指导教师。主要从事污染物的厌氧生物处理及资源化利用研究。2018年以来，作为项目负责人主持国家自然科学基金-青年基金项目1项，国家农业农村部重点研发计划项目子课题1项，教育部重点实验室开放基金项目1项，大连理工大学交叉探索课题1项；作为项目骨干参与“固废资源化”国家重大专项1项、辽宁省科技重大专项2项、国家自然科学基金-面上项目4项。目前，以第一作者或通讯作者身份在Environ Sci Technol、Water Res、J. Hazard Mater、Bioresour. Technol等SCI杂志上发表 JCR一区论文21篇，以其他作者身份参与发表SCI论文30余篇，授权5项中国发明专利, 1项国际发明专利。
