Formation and use of biogenic jarosite carrier for high-rate iron oxidising biofilms

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Formation and use of biogenic jarosite carrier for high-rate iron oxidising biofilms. / Ahoranta, Sarita; Hulkkonen, Hanna ; Salminen, Turkka ; Kuula, Pirjo ; Puhakka, Jaakko A.; Lakaniemi, Aino Maija.

In: Research in Microbiology, 2020.

Research output: Contribution to journal › Article › Scientific › peer-review

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@article{86457621bdcb4f27846a5dbb34b54963,

title = "Formation and use of biogenic jarosite carrier for high-rate iron oxidising biofilms",

abstract = "Jarosite precipitates formed in iron oxidising bioreactors have been shown to harbour iron-oxidisers. The aim of this study was to develop an iron oxidising bioprocess where microorganisms are retained solely on biogenic jarosite particles. Based on preliminary experiments using a fluidised-bed bioreactor (FBR), the formed jarosite particles started to disintegrate and wash out at upflow velocities of ≥0.21 cm/s. Therefore, the generation and use of biogenic jarosite carrier was studied in an expanded-bed bioreactor (J-EBR) with an upflow velocity of 0.19 cm/s. Inside J-EBR, the jarosite particles formed granules of 0.5–3 mm containing 200–460 mg/g of attached biomass. The performance of J-EBR was compared with an activated carbon biofilm FBR at 0.82 cm/s upflow velocity (AC-FBR). At 35 ± 2 °C with a feed ferrous iron concentration of 10 g/l, the highest obtained iron oxidation rate of J-EBR (6.8 g/l/h) was 33{\%} lower than that of AC-FBR (10.1 g/l/h). This was likely due to the 80{\%} lower recirculation rate and subsequently higher oxygen mass transfer limitation in J-EBR compared to AC-FBR. The present study demonstrates that biogenic jarosite can be used for retainment of iron oxidising biofilms in expanded-bed bioreactors that oxidise iron at high rates.",

keywords = "Biogenic carrier, Biomass retainment, Expanded-bed bioreactor, Fluidised-bed bioreactor, Iron oxidation, Jarosite",

author = "Sarita Ahoranta and Hanna Hulkkonen and Turkka Salminen and Pirjo Kuula and Puhakka, {Jaakko A.} and Lakaniemi, {Aino Maija}",

year = "2020",

doi = "10.1016/j.resmic.2020.06.004",

language = "English",

journal = "Research in Microbiology",

issn = "0923-2508",

publisher = "Elsevier",

}

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TY - JOUR

T1 - Formation and use of biogenic jarosite carrier for high-rate iron oxidising biofilms

AU - Ahoranta, Sarita

AU - Hulkkonen, Hanna

AU - Salminen, Turkka

AU - Kuula, Pirjo

AU - Puhakka, Jaakko A.

AU - Lakaniemi, Aino Maija

PY - 2020

Y1 - 2020

N2 - Jarosite precipitates formed in iron oxidising bioreactors have been shown to harbour iron-oxidisers. The aim of this study was to develop an iron oxidising bioprocess where microorganisms are retained solely on biogenic jarosite particles. Based on preliminary experiments using a fluidised-bed bioreactor (FBR), the formed jarosite particles started to disintegrate and wash out at upflow velocities of ≥0.21 cm/s. Therefore, the generation and use of biogenic jarosite carrier was studied in an expanded-bed bioreactor (J-EBR) with an upflow velocity of 0.19 cm/s. Inside J-EBR, the jarosite particles formed granules of 0.5–3 mm containing 200–460 mg/g of attached biomass. The performance of J-EBR was compared with an activated carbon biofilm FBR at 0.82 cm/s upflow velocity (AC-FBR). At 35 ± 2 °C with a feed ferrous iron concentration of 10 g/l, the highest obtained iron oxidation rate of J-EBR (6.8 g/l/h) was 33% lower than that of AC-FBR (10.1 g/l/h). This was likely due to the 80% lower recirculation rate and subsequently higher oxygen mass transfer limitation in J-EBR compared to AC-FBR. The present study demonstrates that biogenic jarosite can be used for retainment of iron oxidising biofilms in expanded-bed bioreactors that oxidise iron at high rates.

AB - Jarosite precipitates formed in iron oxidising bioreactors have been shown to harbour iron-oxidisers. The aim of this study was to develop an iron oxidising bioprocess where microorganisms are retained solely on biogenic jarosite particles. Based on preliminary experiments using a fluidised-bed bioreactor (FBR), the formed jarosite particles started to disintegrate and wash out at upflow velocities of ≥0.21 cm/s. Therefore, the generation and use of biogenic jarosite carrier was studied in an expanded-bed bioreactor (J-EBR) with an upflow velocity of 0.19 cm/s. Inside J-EBR, the jarosite particles formed granules of 0.5–3 mm containing 200–460 mg/g of attached biomass. The performance of J-EBR was compared with an activated carbon biofilm FBR at 0.82 cm/s upflow velocity (AC-FBR). At 35 ± 2 °C with a feed ferrous iron concentration of 10 g/l, the highest obtained iron oxidation rate of J-EBR (6.8 g/l/h) was 33% lower than that of AC-FBR (10.1 g/l/h). This was likely due to the 80% lower recirculation rate and subsequently higher oxygen mass transfer limitation in J-EBR compared to AC-FBR. The present study demonstrates that biogenic jarosite can be used for retainment of iron oxidising biofilms in expanded-bed bioreactors that oxidise iron at high rates.

KW - Biogenic carrier

KW - Biomass retainment

KW - Expanded-bed bioreactor

KW - Fluidised-bed bioreactor

KW - Iron oxidation

KW - Jarosite

U2 - 10.1016/j.resmic.2020.06.004

DO - 10.1016/j.resmic.2020.06.004

M3 - Article

JO - Research in Microbiology

JF - Research in Microbiology

SN - 0923-2508

ER -

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