title: Elementary sulfur in effluent from denitrifying sulfide removal process as adsorbent for zinc(II).
abstract: The denitrifying sulfide removal (DSR) process can simultaneously convert sulfide, nitrate and organic compounds into elementary sulfur (S(0)), di-nitrogen gas and carbon dioxide, respectively. However, the S(0) formed in the DSR process are micro-sized colloids with negatively charged surface, making isolation of S(0) colloids from other biological cells and metabolites difficult. This study proposed the use of S(0) in DSR effluent as a novel adsorbent for zinc removal from wastewaters. Batch and continuous tests were conducted for efficient zinc removal with S(0)-containing DSR effluent. At pH<7.5, removal rates of zinc(II) were increased with increasing pH. The formed S(0) colloids carried negative charge onto which zinc(II) ions could be adsorbed via electrostatic interactions. The zinc(II) adsorbed S(0) colloids further enhanced coagulation-sedimentation efficiency of suspended solids in DSR effluents. The DSR effluent presents a promising coagulant for zinc(II) containing wastewaters.
authors: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
authors: Chuan
authors: C
authors: Chen
authors: Xu
authors: X
authors: Zhou
authors: Aijie
authors: A
authors: Wang
authors: Dong-hai
authors: DH
authors: Wu
authors: Li-hong
authors: LH
authors: Liu
authors: Nanqi
authors: N
authors: Ren
authors: Duu-Jong
authors: DJ
authors: Lee
mesh_terms: D000327:Adsorption; D057919:Biological Oxygen Demand Analysis; D003102:Colloids / Q000737:chemistry*; D058440:Denitrification; D009566:Nitrates / Q000737:chemistry / Q000302:isolation & purification; D017550:Spectroscopy, Fourier Transform Infrared; D013057:Spectrum Analysis; D055672:Static Electricity; D013440:Sulfides / Q000737:chemistry / Q000302:isolation & purification*; D013455:Sulfur / Q000032:analysis / Q000737:chemistry*; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods*; D014961:X-Ray Diffraction; D015032:Zinc / Q000737:chemistry*
chemical_list: D003102:Colloids; D009566:Nitrates; D013440:Sulfides; D013455:Sulfur; D062065:Wastewater; D014874:Water Pollutants, Chemical; D015032:Zinc