In this study, a submerged aerated filter (SAF) using bottle caps as a support medium was evaluated. The system was fed with effluent from an upflow anaerobic sludge blanket system at ETE 2-South wastewater treatment plant, under different volumetric organic load rates (VOLRs). The population of a particular nitrifying microbial community was assessed by fluorescent in situ hybridization with specific oligonucleotide probes. The system showed an average removal of chemical oxygen demand (COD) equal to 76% for VOLRs between 2.6 and 13.6 kg COD m−3_media.day−1. The process of nitrification in conjunction with the removal of organic matter was observed from applying VOLRs lower than 5.5 kg COD m−3_media.day−1 resulting in 78% conversion of NH4+-N. As the applied organic load was reduced, an increase in the nitrifying bacteria population was observed compared with total 4′-6-diamidino-2-phenylindole (DAPI) stained cells. Generally, SAF using bottle caps as a biological aerated filter medium treating wastewater from an anaerobic system showed promising removal of chemical oxygen demand (COD) and conversion of NH4+-N.
The use of bottle caps as submerged aerated filter medium
Laurence Damasceno de Oliveira, Amir Mohaghegh Motlagh, Ramesh Goel, Beatriz de Souza Missagia, Benício Alves de Abreu Filho, Sandro Rogério Lautenschlager; The use of bottle caps as submerged aerated filter medium. Water Sci Technol 1 April 2014; 69 (7): 1518–1525. doi: https://doi.org/10.2166/wst.2014.008
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