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Nitrogen and phosphorus removal from wastewater treatment plant effluent via bacterial sulfate reduction in an anoxic bioreactor packed with wood and iron.

Yamashita T, Yamamoto-Ikemoto R - Int J Environ Res Public Health (2014)

Bottom Line: The average nitrification rate in the trickling filter was 0.17 kg N/m3∙day and remained at 0.11 kg N/m3∙day even when the water temperature was below 15 °C.The bioreactor packed with aspen wood and iron continued to remove nitrate and phosphate for >1200 days of operation.There was no increase in the amount of dissolved organic matter in the outflow from the bioreactors.

View Article: PubMed Central - PubMed

Affiliation: NARO Institute of Livestock and Grassland Science, National Agriculture and Food Research Organization, 2 Ikenodai, Tsukuba, Ibaraki 305-0901, Japan. yamatktk@affrc.go.jp.

ABSTRACT
We investigated the removal of nitrogen and phosphate from the effluent of a sewage treatment plant over a long-term operation in bioreactors packed with different combinations of wood and iron, with a trickling filter packed with foam ceramics for nitrification. The average nitrification rate in the trickling filter was 0.17 kg N/m3∙day and remained at 0.11 kg N/m3∙day even when the water temperature was below 15 °C. The denitrification and phosphate removal rates in the bioreactor packed with aspen wood and iron were higher than those in the bioreactor packed with cedar chips and iron. The bioreactor packed with aspen wood and iron continued to remove nitrate and phosphate for >1200 days of operation. The nitrate removal activity of a biofilm attached to the aspen wood from the bioreactor after 784 days of operation was 0.42 g NO3-N/kg dry weight wood∙ day. There was no increase in the amount of dissolved organic matter in the outflow from the bioreactors.

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The relationship between increased nitrate and decreased inorganic carbon in Reactor 1.
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ijerph-11-09835-f003: The relationship between increased nitrate and decreased inorganic carbon in Reactor 1.

Mentions: The relationship between the decreased NH4-N and increased NO3-N in Reactor 1 is shown in Figure S1 of the Supplementary Materials. The decreased NH4-N was associated with an increase in NO3-N, indicating that nitrification occurred steadily in Reactor 1. In addition, NO3-N accumulated without the occurrence of denitrification. We suspected that the influent of Reactor 1 contained almost no organic compounds as electron donors for denitrification. The relationship between the increased nitrate and decreased inorganic carbon in Reactor 1 is shown in Figure 3. Based on the assumption that the gross composition of Nitrosomonas and Nitrobacter can be represented by C5H7NO2, the nitrification can be described by the following equation [13]:NH4+ + 1.83O2 + 1.98HCO3− → 0.98NO3− + 0.021C5H7NO2 + 1.041H2O + 1.88H2CO3(1)


Nitrogen and phosphorus removal from wastewater treatment plant effluent via bacterial sulfate reduction in an anoxic bioreactor packed with wood and iron.

Yamashita T, Yamamoto-Ikemoto R - Int J Environ Res Public Health (2014)

The relationship between increased nitrate and decreased inorganic carbon in Reactor 1.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4199053&req=5

ijerph-11-09835-f003: The relationship between increased nitrate and decreased inorganic carbon in Reactor 1.
Mentions: The relationship between the decreased NH4-N and increased NO3-N in Reactor 1 is shown in Figure S1 of the Supplementary Materials. The decreased NH4-N was associated with an increase in NO3-N, indicating that nitrification occurred steadily in Reactor 1. In addition, NO3-N accumulated without the occurrence of denitrification. We suspected that the influent of Reactor 1 contained almost no organic compounds as electron donors for denitrification. The relationship between the increased nitrate and decreased inorganic carbon in Reactor 1 is shown in Figure 3. Based on the assumption that the gross composition of Nitrosomonas and Nitrobacter can be represented by C5H7NO2, the nitrification can be described by the following equation [13]:NH4+ + 1.83O2 + 1.98HCO3− → 0.98NO3− + 0.021C5H7NO2 + 1.041H2O + 1.88H2CO3(1)

Bottom Line: The average nitrification rate in the trickling filter was 0.17 kg N/m3∙day and remained at 0.11 kg N/m3∙day even when the water temperature was below 15 °C.The bioreactor packed with aspen wood and iron continued to remove nitrate and phosphate for >1200 days of operation.There was no increase in the amount of dissolved organic matter in the outflow from the bioreactors.

View Article: PubMed Central - PubMed

Affiliation: NARO Institute of Livestock and Grassland Science, National Agriculture and Food Research Organization, 2 Ikenodai, Tsukuba, Ibaraki 305-0901, Japan. yamatktk@affrc.go.jp.

ABSTRACT
We investigated the removal of nitrogen and phosphate from the effluent of a sewage treatment plant over a long-term operation in bioreactors packed with different combinations of wood and iron, with a trickling filter packed with foam ceramics for nitrification. The average nitrification rate in the trickling filter was 0.17 kg N/m3∙day and remained at 0.11 kg N/m3∙day even when the water temperature was below 15 °C. The denitrification and phosphate removal rates in the bioreactor packed with aspen wood and iron were higher than those in the bioreactor packed with cedar chips and iron. The bioreactor packed with aspen wood and iron continued to remove nitrate and phosphate for >1200 days of operation. The nitrate removal activity of a biofilm attached to the aspen wood from the bioreactor after 784 days of operation was 0.42 g NO3-N/kg dry weight wood∙ day. There was no increase in the amount of dissolved organic matter in the outflow from the bioreactors.

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