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      Metabolic divergence in simultaneous biological removal of nitrate and sulfide for elemental sulfur production under temperature stress.

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          Abstract

          The simultaneous removal of NO3(-) and HS(-) at temperature stress (25-10°C) is evaluated here. An expanded granular sludge bed (EGSB) reactor was run over 120days at N/S molar ratio of 0.35 (for S(0) production) under constant sulfur loading rate of 0.4kgS/m(3)d. The simultaneous removal of NO3(-) and HS(-), was achieved at applied conditions. Average HS(-)-S removal varied from 98 (25°C) to 89.2% at 10°C, with almost complete NO3(-) removal. Average S(0) yield ranged from 83.7 at 25°C to 67% at 10°C. The temperature drop caused a decrease in granular sludge accumulated S(0) fraction by nearly 2.5 times. Decreased temperature caused metabolic pathway change observed as higher SO4(2-) production, apparently allowing the biomass to obtain more energy per HS(-) consumed. It is hypothesized that the metabolic shift is a natural response to compensate for temperature-induced changes in energy requirements.

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          Author and article information

          Journal
          Bioresour. Technol.
          Bioresource technology
          Elsevier BV
          1873-2976
          0960-8524
          Jun 2017
          : 233
          Affiliations
          [1 ] University College of Southeast Norway, Kjølnes Ring 56, Porsgrunn 3918, Norway. Electronic address: michal.sposob@usn.no.
          [2 ] University College of Southeast Norway, Kjølnes Ring 56, Porsgrunn 3918, Norway.
          Article
          S0960-8524(17)30251-1
          10.1016/j.biortech.2017.02.122
          28279914
          3e084b8b-bf5a-4cd4-b323-713a6b52f056
          History

          Autotrophic denitrification,Elemental sulfur recovery,Sulfate production,Sulfide removal,Temperature impact

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