固定床方式の硝化槽の硝化効率に及ぼす窒素負荷量および水温の影響〔英文〕

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  • Effect of Nitrogen Load and Water Temperature on Nitrification Efficiency of Nitrification Tank Using Submerged Bed Process.
  • コテイショウ ホウシキ ノ ショウカソウ ノ ショウカ コウリツ ニ オヨボス

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Synthetic inorganic NH4-N wastewater with a load of 0.06, 0.12 and 0.24g/l·d were drculated through a nitrification tank equipped with a lace-like contact medium. At water temperatures of 20 and 30°C, high nitrification efficienaes (more than 90%) were obtained irrespective of the loading condition. At a water temperature of 10°C, a nitrification efficsency of approximately 80%was obtained under a low loading condition of 0.06 g-NH4-N/l⋅d. The maximum nitrifcation rates were 22.6mg-N/g-VSS·hr at a water temperature of 30°C, 11.0mg-N/g-VSS·hr at a water temperature of 20°C and 6.2mg-N/g-VSS·hr at a water temperature of 10°C.Temperature coeffiaents (θ) for nitrification were calculated to be 1.023-1.084.As the NH4-N loading rate was lowered, the influence of water temperature on nitrification effiaency was smaller. These results show that the nitrogen load should be limited to 0.06g/l⋅d or lower for nitrification treatment using the submerged bed process at a low water temperature.

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