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Coagulation and precipitation as post-treatment of anaerobically treated primary municipal wastewater

Diamantopoulos Evaggelos, Megalou Konstantina, Georgiou Maria, Gizgis Nikolaos

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URIhttp://purl.tuc.gr/dl/dias/B6569218-1A7E-4FF4-876D-7ECD96C435A8-
Identifierhttps://doi.org/10.2175/106143006X101962-
Identifierhttps://www.jstor.org/stable/23803216?seq=1#page_scan_tab_contents-
Languageen-
Extent9 pagesen
TitleCoagulation and precipitation as post-treatment of anaerobically treated primary municipal wastewateren
CreatorDiamantopoulos Evaggelosen
CreatorΔιαμαντοπουλος Ευαγγελοςel
CreatorMegalou Konstantinaen
CreatorGeorgiou Mariaen
CreatorGizgis Nikolaosen
PublisherWater Environment Federationen
Content SummaryThe main objective of this study was to investigate the feasibility of coagulation as a post-treatment method of anaerobically treated primary municipal wastewater. Both mesophilic and ambient (20°C) temperature conditions were investigated in a laboratory-scale upflow anaerobic sludge bed (UASB) reactor. In addition, optimization of the coagulant, both in terms of type and dose, was performed. Finally, phosphorus removal by means of aluminum and iron coagulation and phosphorus and ammonia nitrogen removal by means of struvite precipitation were studied. Anaerobic treatment of primary effluent at low hydraulic retention times (less than 15 hours) resulted in mean chemical oxygen demand (COD) removals ranging from 50 to 70%, while, based on the filtered treated effluent, the mean removals increased to 65 to 80%. Alum coagulation of the UASB effluent gave suspended solids removals ranging from approximately 35 to 65%. Turbidity removal reached up to 80%. Remaining COD values after coagulation and settling were below 100 mg/L, while remaining total organic carbon (TOC) levels were below 50 mg/L. Filterable COD levels were generally below 60 mg/L, while filterable TOC levels were below 40 mg/L. All coagulants tested, including prepolymerized aluminum and iron coagulants, demonstrated similar efficiency compared with alum for the removal of suspended solids, COD, and TOC. Regarding struvite precipitation, optimal conditions for phosphorus and nitrogen removal were pH 10 and molar ratio of magnesium: ammonia-nitrogen: phosphate-phosphorus close to the stoichiometric ratio (1:1:1). During struvite precipitation, removal of suspended solids reached 40%, while turbidity removal reached values up to 80%. The removal of COD was approximately 30 to 35%; yet, when removal of organic matter was based on the treated filterable COD, the removal increased to approximately 65%. In addition, nitrogen was removed by approximately 70%, while phosphorus removal ranged between approximately 30 and 45% on the basis of the initial phosphorus concentration. Finally, size fractionation of the organic matter (COD) showed that the various treatment methods were capable of removing different fractions of the organic matter.en
Type of ItemPeer-Reviewed Journal Publicationen
Type of ItemΔημοσίευση σε Περιοδικό με Κριτέςel
Licensehttp://creativecommons.org/licenses/by/4.0/en
Date of Item2015-11-18-
Date of Publication2007-
SubjectCoagulation in water purificationen
SubjectWater--Coagulationen
Subjectwater purification coagulationen
Subjectcoagulation in water purificationen
Subjectwater coagulationen
Bibliographic CitationE. Diamadopoulos, K. Megalou, M. Georgiou and N. Gizgis, “Coagulation and precipitation as post-treatment of anaerobically treated primary municipal wastewater,” Water Environ. Res., vol. 79, no. 2, pp. 131-139, Feb. 2007. doi: 10.2175/106143006X101962en

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