| Alternate anoxic/aerobic operation for nitrogen removal in a membrane bioreactor for municipal wastewater treatment. | |
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MedLine Citation:
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PMID: 22335118 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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A large pilot-scale membrane bioreactor (MBR) with a conventional denitrification/nitrification scheme for municipal wastewater treatment has been run for one year under two different aeration strategies in the oxidation/nitrification compartment. During the first five months air supply was provided according to the dissolved-oxygen set-point and the system run as a conventional predenitrification MBR; then, an intermittent aeration strategy based on effluent ammonia nitrogen was adopted in the aerobic compartment in order to assess the impact on process performances in terms of N and P removal, energy consumption and sludge reduction. The experimental inferences show a significant improvement of the effluent quality as COD and total nitrogen, both due to a better utilization of the denitrification potential which is a function of the available electron donor (biodegradable COD) and electron acceptor (nitric nitrogen); particularly, nitrogen removal increased from 67% to 75%. At the same time, a more effective biological phosphorus removal was observed as a consequence of better selection of denitrifying phosphorus accumulating organisms (dPAO). The longer duration of anoxic phases also reflected in a lower excess sludge production (12% decrease) compared with the standard pre-denitrification operation and in a decrease of energy consumption for oxygen supply (about 50%). |
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Authors:
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G Guglielmi; G Andreottola |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Water science and technology : a journal of the International Association on Water Pollution Research Volume: 64 ISSN: 0273-1223 ISO Abbreviation: Water Sci. Technol. Publication Date: 2011 |
Date Detail:
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Created Date: 2012-02-16 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9879497 Medline TA: Water Sci Technol Country: England |
Other Details:
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Languages: eng Pagination: 1730-5 Citation Subset: IM |
Affiliation:
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Department of Civil and Environmental Engineering, University of Trento, 38100 Trento, Italy. giuseppe.guglielmi@etc-eng.it |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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