A Nitrogen Success Story

The operation of the Hooker's Point advanced wastewater treatment works at Tampa, Fla., the world's largest nitrogen-removal unit, is presented. Presently treating a flow of 70 mgd, but being expanded to cope with 96 mgd by the Autumn of 1995, it uses a 2-stage nitrification process, follo...

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Bibliographic Details
Published in:Water environment & technology 1994-01, Vol.6 (9), p.70-74
Main Authors: Wilson, Thomas E., Pickard, David W., Bizzarri, Ronald E.
Format: Magazinearticle
Language:English
Subjects:
Activated sludge
Aeration
Aerobic digestion
Applied sciences
Drying
Exact sciences and technology
Nitrification
Nitrogen
Oxygen
Pollution
Sewerage works: sewers, sewage treatment plants, outfalls
Sludge digestion
UPDATE
Wastewater treatment
Water filtration
Water treatment and pollution
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Summary:The operation of the Hooker's Point advanced wastewater treatment works at Tampa, Fla., the world's largest nitrogen-removal unit, is presented. Presently treating a flow of 70 mgd, but being expanded to cope with 96 mgd by the Autumn of 1995, it uses a 2-stage nitrification process, followed by denitrification in deep-bed filters. Targets for its effluent include a 90 per cent reduction of the 5-d BOD, suspended solids, and total nitrogen from their influent levels of, respectively, about 250, 200 and 30 mg per litre. Local industrial and brewery effluents account for about 35 per cent of the BOD, though only 8 per cent of the flow. The layout of the works as originally built and as later modified is shown. Most of the waste activated sludge is now digested anaerobically rather than aerobically, gravity waste activated sludge thickeners have been replaced by dissolved air flotation units and belt thickeners, and the solids retention time has been reduced to avoid the foaming believed to be caused by the presence of Nocardia. The progress of the decline of the target factors after various stages of treatment is shown, as is the time the liquid spends in each. An outline of costs per unit volume of water treated is included.
ISSN:1044-9493
1938-193X