Impact of aeration conditions on the removal of low concentrations of nitrogen in a tertiary partially aerated biological filter

Preparation of ceramic filler from reusing sewage sludge and application in biological aerated filter for soy protein secondary wastewater treatment

“…BAF presents several advantages over other fixed-film reactors (e.g. rotating biological contactors or trickling filters), including high loading rates [11,12], high active biomass concentration and sludge retention time (SRT), good pollutant efficiency (carbon, nitrogen, phosphorus and pathogen) removal combined with a high filtering capacity [13][14][15]. Furthermore, the space required for BAF construction is quite small compared to other aerobic process [16,17].…”

A combined application of different engineering and biological techniques to remediate a heavily polluted river

“…High DO can enhance the removal of nutrients in water bodies (Albuquerque et al, 2012). In order to increase the DO in river water, aerators were installed in reach sections S1, S2 and S3 ( Fig.…”

“…2 that after 21st August, the reduction of COD Cr , NH 4 + -N and TSS reached ∼85%. This phenomenon can be explained by following processes: (1) the hydraulic retention time was prolonged by constructed dams, which enhanced the sedimentation of pollutants and suspended solids in the river water; (2) the artificial aeration increased the DO level in the water body, which provided stronger oxidation to degrade the pollutants (Albuquerque et al, 2012); (3) after one month, the microbial community in the water body, BAF and artificial biofilms will have built up, enhancing the removal of pollutants (Cao et al, 2012;Sheng et al, 2012); (4) the plant roots of the ecological floating bed began to consume the C, N, P as nutrition (Hadad and Maine, 2007;Jia et al, 2011). In this work, filter materials (coal cinders) used in BAF and artificial biofilms (Beier Film) have specific surface area for biofilm production, providing living space for PSB, B. subtilis and nativeborn microorganisms.…”

“…In this experimental reach, the dams have slowed the current and hence reduced the resuspension of bed load. Furthermore, with the engineering process conducted, suspended solids with small particle size were filtered by the series of BAFs (Albuquerque et al, 2012). Although the aerators disturbed the sedimentary sludge, the solids re-deposited out of the influence scope of aerators.…”

“…Dosing frequency was weekly at the beginning of the experiment, but was then decreased each month as the engineering progressed, based on the measured quality of the recovering river-water. Media used in biological aerated filters (BAF) must have suitable specific surface area to allow good biofilm development (Albuquerque et al, 2012). A mixture of converter slag and coal cinder can be used as adsorbent for the removal of phosphorous, COD and NH 4 + -N (Yang et al, 2009).…”