کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4997493 | 1459910 | 2017 | 7 صفحه PDF | دانلود رایگان |
- Simultaneous biological nitrate and sulfide removal at 25-10 °C was documented.
- Sulfide removal was from 98 (25 °C) to 89.2% (10 °C) with complete nitrate removal.
- Elemental sulfur yield ranged from 83.7% at 25 °C to 67% at 10 °C.
- Accumulation of elemental sulfur decreased with temperature.
- Metabolic shift at lower temperature was indicated by increased sulfate production.
The simultaneous removal of NO3â and HSâ at temperature stress (25-10 °C) is evaluated here. An expanded granular sludge bed (EGSB) reactor was run over 120 days at N/S molar ratio of 0.35 (for S0 production) under constant sulfur loading rate of 0.4 kg S/m3 d. The simultaneous removal of NO3â and HSâ, was achieved at applied conditions. Average HSâ-S removal varied from 98 (25 °C) to 89.2% at 10 °C, with almost complete NO3â removal. Average S0 yield ranged from 83.7 at 25 °C to 67% at 10 °C. The temperature drop caused a decrease in granular sludge accumulated S0 fraction by nearly 2.5 times. Decreased temperature caused metabolic pathway change observed as higher SO42â production, apparently allowing the biomass to obtain more energy per HSâ 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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Journal: Bioresource Technology - Volume 233, June 2017, Pages 209-215