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Process Simulation to Optimize Nitrogen Removal in Intermittent Aeration Activated Sludge

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A potential approach to retrofit conventional activated sludge plants to achieve biological nitrogen removal is to utilize an intermittent aeration strategy within a single reactor. The feasibility of this approach was assessed through a series of simulations using Activated Sludge Model No. 1. Simulation results indicated that up to 90% nitrogen removal could be attained with appropriate selection of the cycle time and the duration of its anoxic phase. Maximum nitrogen removal could be achieved with cycle time of 2 – 3 h, 40 – 50 % of which should be under anoxic conditions. A hydraulic residence time of 10 – 16 h was adequate to achieve these results. The solids residence time was 15 – 25 d to ensure that a stable population of nitrifying organism would be established.

Keywords: Activated sludge; biological nitrogen removal; denitrification; nitrification; process simulation

Document Type: Research Article


Publication date: 2010-01-01

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