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- W1981982820 abstract "A distinct difference exists between the experimentally measured and theoretically calculated values of residence time in percolating biological filters. From existing information it was shown that the measured values are usually at least three times higher than those calculated theoretically. Based on several premises, it was concluded that two liquid film layers should be distinguished. One “free” liquid film flowing on top of the biofilm, the second “captured” flowing through the biofilm. From experimentally measured residence time, it becomes evident that the total liquid film depth will be in the region of 150–550 μm for a hydraulic load range of 0.02–5 m3m−2m−1. It can be proved that oxygen cannot penetrate up to such a depth, especially when the captured liquid film thickness is in the region of 110–380 μm. The largely anoxic conditions in the captured liquid film are in drastic contrast with the prevailing conditions close to oxygen saturation in the free flowing liquid layer. Due to the large developed surface the outflowing liquid can be saturated with oxygen. The measured oxygen concentration in filter effluent does not reflect the aerobic conditions neither in the captured liquid film nor in the biofilm as such." @default.
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- W1981982820 date "1987-01-01" @default.
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- W1981982820 title "Hydraulic performance of percolating biological filters and consideration of oxygen transfer" @default.
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- W1981982820 doi "https://doi.org/10.1016/s0043-1354(87)80001-5" @default.
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