AI Article Synopsis
- Low temperatures hinder the anammox reaction, but adding the right form of iron (Fe) can boost its effectiveness.
- Batch experiments tested different sizes of magnetite (100 μm, 20 μm, and 200 nm) on anammox processes at 10-25 °C.
- Results showed that nano-scale magnetite significantly enhanced nitrogen elimination, achieving the highest specific anammox activity (18.0 mgTN/(gVSS·h)) compared to larger sizes.
- X-ray analyses revealed that nano-magnetite better adhered to granule surfaces, potentially speeding up the release of beneficial iron for improved anammox performance.
Article Abstract
Low temperature is adverse to anaerobic ammonium oxidation (anammox) reaction while proper Fe addition can enhance anammox performance. Therefore, batch assays were conducted to investigate the potential effects of magnetite (100 μm, 20 μm and 200 nm) on anammox performance which were achieved from the reactor operated at 10-25 °C. After 3 runs, the results indicated that nano-scale magnetite improved the nitrogen elimination significantly. The specific anammox activity (SAA) of the group with nano-magnetite amendments was greater than the other groups after 3 runs (13.5, 12.9, 14.3, 15.4 and 15.7 mgTN/(gVSS·h)), reaching 18.0 mgTN/(gVSS·h). The distribution of magnetite in the granules were then analyzed using X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDS). The results indicated that nano-magnetite was more feasible to attached to the surface of the granules which might accelerate the release of Fe(II) or Fe(III) to enhance anammox performance.
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| http://dx.doi.org/10.1016/j.biortech.2021.125470 | DOI Listing |
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