The simultaneous removal of NO 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 production) under constant sulfur loading rate of 0.4kgS/md. The simultaneous removal of NO 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 NO removal. Average S yield ranged from 83.7 at 25°C to 67% at 10°C. The temperature drop caused a decrease in granular sludge accumulated S fraction by nearly 2.5 times. Decreased temperature caused metabolic pathway change observed as higher SO 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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