Time Vs. Space: Two Successful Biological Nutrient Removal Strategies

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Two distinct strategies have been practiced successfully for nutrient removals at a facility. One utilizes a continuous flow strategy with designated anaerobic, anoxic and aerobic zones. This strategy was targeted for biological nitrogen and phosphorus removal with minimal chemical addition. The other utilizes anaerobic, anoxic and aerobic cycle times in sequence at existing basins under a timer control. Chemical addition is a primary means of phosphorus removal in this strategy.

Results show good performance in meeting current discharge limits. Process parameters for design and operation are presented with corresponding discussion on advantages and disadvantages of two strategies.

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