title: Sulfide elimination by intermittent nitrate dosing in sewer sediments.
abstract: The formation of hydrogen sulfide in biofilms and sediments in sewer systems can cause severe pipe corrosions and health hazards, and requires expensive programs for its prevention. The aim of this study is to propose a new control strategy and the optimal condition for sulfide elimination by intermittent nitrate dosing in sewer sediments. The study was carried out based on lab-scale experiments and batch tests using real sewer sediments. The intermittent nitrate dosing mode and the optimal control condition were investigated. The results indicated that the sulfide-intermittent-elimination strategy by nitrate dosing is advantageous for controlling sulfide accumulation in sewer sediment. The oxidation-reduction potential is a sensitive indicator parameter that can reflect the control effect and the minimum N/S (nitrate/sulfide) ratio with slight excess nitrate is necessary for optimal conditions of efficient sulfide control with lower carbon source loss. The optimal control condition is feasible for the sulfide elimination in sewer systems.
authors.affiliation: School of Environment, Tsinghua University, Beijing 100084, China. Electronic address: liuyc@mail.tsinghua.edu.cn.
authors.forename: Yanchen
authors.initials: Y
authors.lastname: Liu
authors.affiliation: School of Environment, Tsinghua University, Beijing 100084, China.
authors.forename: Chen
authors.initials: C
authors.lastname: Wu
authors.affiliation: School of Environment, Tsinghua University, Beijing 100084, China.
authors.forename: Xiaohong
authors.initials: X
authors.lastname: Zhou
authors.affiliation: Department of Civil and Environmental Engineering, University of Alberta, T6G2W2 Edmonton, Alberta, Canada.
authors.forename: David Z
authors.initials: DZ
authors.lastname: Zhu
authors.affiliation: School of Environment, Tsinghua University, Beijing 100084, China. Electronic address: hanchang@mail.tsinghua.edu.cn.
authors.forename: Hanchang
authors.initials: H
authors.lastname: Shi
mesh_terms: D000818:Animals; D019149:Bioreactors; D006862:Hydrogen Sulfide / Q000378:metabolism*; D009566:Nitrates / Q000378:metabolism*; D012722:Sewage / Q000032:analysis*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000378:metabolism*
chemical_list: D009566:Nitrates; D012722:Sewage; D014874:Water Pollutants, Chemical; D006862:Hydrogen Sulfide
keywords: Intermittent nitrate dosing; Optimal condition; Sediment; Sewer system; Sulfide elimination