Performance of intermittently operated sand filters: A comparable study, treatingwastewaters of different origins
The purpose of this research was to determine the efficiency of sand filters to remove several common pollutants, found in most wastewaters. In order to achieve this objective, Plexiglas columns of 1 m height were used. The columns were filled with river sand and loaded with real or synthetic wastewaters, corresponding to different origins, following an intermittent feeding schedule. The effect of addition of inoculum to the synthetic wastewaters was also examined and the results were compared with the uninoculated columns. The inoculum consisted of 20 ml addition of activated sludge from the aeration tank of a large-scale wastewater treatment plant. Samples of the inlet and outlet of these columns were analyzed for common parameters (TSS, COD, NH4-N, NO2-N, NO3- N, TN, PO4-P and pH). At the end of each experimental serie, sand samples from different column heights were obtained and observed, using a Scanning ElectronMicroscope (SEM). The SEMmicrographs demonstrated the existence of microorganisms through out the column depth. The analysis of effluent show significant reduction of COD (more than 50% for the majority of wastewaters that were used) and PO4-P (more than 40%), as compared with the initial loading. Ammonification occurred and by increasing the number of loadings, nitrification was subsequently observed. Denitrification was not found to take place, due to the lack of anoxic conditions
Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης, Σχολή Θετικών Επιστημών, Τμήμα Χημείας
Water, Air, and Soil Pollution, vol.147  p.367-388 [Published Version]
This record is part of 'IKEE', the Institutional Repository of Aristotle University of Thessaloniki's Library and Information Centre found at http://ikee.lib.auth.gr. Unless otherwise stated above, the record metadata were created by and belong to Aristotle University of Thessaloniki Library, Greece and are made available to the public under Creative Commons Attribution-ShareAlike 4.0 International license (http://creativecommons.org/licenses/by-sa/4.0).
Unless otherwise stated in the record, the content and copyright of files and fulltext documents belong to their respective authors. Out-of-copyright content that was digitized, converted, processed, modified, etc by AUTh Library, is made available to the public under Creative Commons Attribution-ShareAlike 4.0 International license (http://creativecommons.org/licenses/by-sa/4.0). You are kindly requested to make a reference to AUTh Library and the URL of the record containing the resource whenever you make use of this material.
*Institutions are responsible for keeping their URLs functional (digital file, item page in repository site)