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Effects of chromium (VI) addition on the activated sludge process

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dc.contributor.author Stasinakis, AS en
dc.contributor.author Thomaidis, NS en
dc.contributor.author Mamais, D en
dc.contributor.author Papanikolaou, EC en
dc.contributor.author Tsakon, A en
dc.contributor.author Lekkas, TD en
dc.date.accessioned 2014-03-01T01:18:55Z
dc.date.available 2014-03-01T01:18:55Z
dc.date.issued 2003 en
dc.identifier.issn 0043-1354 en
dc.identifier.uri http://hdl.handle.net/123456789/15263
dc.subject COD removal en
dc.subject Nitrification en
dc.subject Sludge settling en
dc.subject Toxicity en
dc.subject Wastewater en
dc.subject.classification Engineering, Environmental en
dc.subject.classification Environmental Sciences en
dc.subject.classification Water Resources en
dc.subject.other Chemicals removal (water treatment) en
dc.subject.other Chromium en
dc.subject.other Microorganisms en
dc.subject.other Nitrification en
dc.subject.other Reduction en
dc.subject.other Rotifers en
dc.subject.other Activated sludge process en
dc.subject.other chromium en
dc.subject.other activated sludge en
dc.subject.other chromium en
dc.subject.other nitrification en
dc.subject.other wastewater treatment en
dc.subject.other activated sludge en
dc.subject.other article en
dc.subject.other bacterium contamination en
dc.subject.other chemical composition en
dc.subject.other concentration response en
dc.subject.other effluent en
dc.subject.other nitrification en
dc.subject.other priority journal en
dc.subject.other protozoon en
dc.subject.other Rotifera en
dc.subject.other sludge settling en
dc.subject.other waste water treatment plant en
dc.subject.other Bacteria en
dc.subject.other Bioreactors en
dc.subject.other Carcinogens, Environmental en
dc.subject.other Chromium en
dc.subject.other Flocculation en
dc.subject.other Nitrogen en
dc.subject.other Population Dynamics en
dc.subject.other Sewage en
dc.subject.other Waste Disposal, Fluid en
dc.subject.other Protozoa en
dc.subject.other Rotifera en
dc.title Effects of chromium (VI) addition on the activated sludge process en
heal.type journalArticle en
heal.identifier.primary 10.1016/S0043-1354(02)00623-1 en
heal.identifier.secondary http://dx.doi.org/10.1016/S0043-1354(02)00623-1 en
heal.language English en
heal.publicationDate 2003 en
heal.abstract The effect of hexavalent chromium, Cr(VI), addition on various operating parameters of activated sludge process was evaluated. To accomplish this, two parallel lab-scale continuous-flow activated sludge plants were operated. One was used as a control plant, while the other received Cr(VI) concentrations equal to 0.5, 1, 3 and 5mg1(-1). Cr(VI) concentrations of 0.5 mg 1(-1) caused significant inhibition of the nitrification process (up to 74% decrease in ammonia removal efficiency). On the contrary, the effect of Cr(VI) on organic substrate removal was minor for concentrations up to 5mg1(-1), indicating that heterotrophic microorganisms are less sensitive to Cr(VI) than nitrifiers. Activated sludge floc size and structure characterization showed that Cr(VI) concentrations higher than 1 mg 1(-1) reduced the filaments abundance, causing the appearance of pin-point flocs and free-dispersed bacteria. Additionally, the variability of protozoa and rotifers was reduced. As a result of disperse growth, effluent quality deteriorated, since significant amounts of suspended solids escaped with the effluent. Termination of Cr(VI) addition led to a partial recovery of the nitrification process (up to 57% recovery). Similar recovery signs were not observed for activated sludge floc size and structure. Finally, shock loading to the control plant with 5 mg 1(-1) Cr(VI) for 2 days resulted in a significant inhibition of the nitrification process and a reduction in filamentous microorganisms abundance. (C) 2002 Elsevier Science Ltd. All rights reserved. en
heal.publisher PERGAMON-ELSEVIER SCIENCE LTD en
heal.journalName Water Research en
dc.identifier.doi 10.1016/S0043-1354(02)00623-1 en
dc.identifier.isi ISI:000182421600019 en
dc.identifier.volume 37 en
dc.identifier.issue 9 en
dc.identifier.spage 2140 en
dc.identifier.epage 2148 en


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