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Influence of anaerobic and anoxic hydraulic retention time (HRT), a commonly used parameter by treatment plant design engineers and operators, on nitrogen and phosphorus removal was studied in an anaerobic/anoxic/oxic membrane bioreactor with fixed recycle rates. Anaerobic HRTs were varied between 0.5 and 3h, anoxic HRTs were varied between 1 and 5h while the aerobic HRT was fixed at 8h. Total nitrogen...
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