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Study on Effective Nitrogen and Phosphor Removal by Carrier-added Activated Sludge Process

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With the objectives of improving nitrogen removal efficiency and reducing treatment time, we constructed a pilot plant for a two-step feed recycled nitrification/denitrification process with sponge carriers added, and conducted a series of nitrogen and phosphor removal performance tests. Results showed that we achieved our treated water target of 10 mg/L in total nitrogen content by setting carrier packing density at 30 v/v% and hydraulic retention time (HRT) at 6 hr. We replaced one of the anoxic tanks at the pilot plant inlet with an anaerobic tank, to investigate the plant's nitrogen and phosphor removal performance at a carrier packing density of 20 v/v% and HRT of 7 hr. Results showed that we were able to reduce total nitrogen content to our treated water target of 10 mg/L and total phosphor content to our treated water target of 1 mg/L.
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Document Type: Research Article

Publication date: 2004-01-01

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