| A modified UCT method for biological nutrient removal: configuration and performance. | |
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MedLine Citation:
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PMID: 18519149 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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A pilot-scale prototype activated sludge system is presented, which combines both, the idea of University of Cape Town (UCT) concept and the step denitrification cascade for removal of carbon, nitrogen and phosphorus. The experimental set-up consists of an anaerobic selector and stepwise feeding in subsequent three identical pairs of anoxic and oxic tanks. Raw wastewater with influent flow rates ranging between 48 and 168 l d(-1) was fed to the unit at hydraulic residence times (HRTs) of 5-18 h and was distributed at percentages of 60/25/15%, 40/30/30% and 25/40/35% to the anaerobic selector, 2nd and 3rd anoxic tanks, respectively (influent flow distribution before the anaerobic selector). The results for the entire experimental period showed high removal efficiencies of organic matter of 89% as total chemical oxygen demand removal and 95% removal for biochemical oxygen demand, 90% removal of total Kjeldahl nitrogen and total nitrogen removal through denitrification of 73%, mean phosphorus removal of 67%, as well as excellent settleability. The highest removal efficiency and the optimum performance were recorded at an HRT of about 9h and influent flow rate of 96 l d(-1), in which 60% is distributed to the anaerobic selector, 25% to the second anoxic tank and 15% to the last anoxic tank. Consequently, the plant configuration enhanced removal efficiency, optimized performance, saved energy, formed good settling sludge and provided operational assurance. |
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Authors:
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E Vaiopoulou; A Aivasidis |
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Publication Detail:
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Type: Journal Article Date: 2008-06-02 |
Journal Detail:
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Title: Chemosphere Volume: 72 ISSN: 0045-6535 ISO Abbreviation: Chemosphere Publication Date: 2008 Jul |
Date Detail:
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Created Date: 2008-06-20 Completed Date: 2008-10-08 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0320657 Medline TA: Chemosphere Country: England |
Other Details:
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Languages: eng Pagination: 1062-8 Citation Subset: IM |
Affiliation:
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Department of Environmental Engineering, Democritus University of Thrace, Vas. Sofias 12, 67100 Xanthi, Greece. vaiop@env.duth.gr |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Bioreactors Carbon / isolation & purification*, metabolism* Nitrogen / isolation & purification*, metabolism* Phosphorus / isolation & purification*, metabolism* Reproducibility of Results Sewage Universities Waste Management / methods* |
| Chemical | |
Reg. No./Substance:
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0/Sewage; 7440-44-0/Carbon; 7723-14-0/Phosphorus; 7727-37-9/Nitrogen |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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