Short-cut nitrification in biological aerated filters with modified zeolite and nitrifying sludge

A modified BAF system configuring synergistic denitrification and chemical phosphorus precipitation: Examination on pollutants removal and clogging development

“…The biological aerated filter (BAF) process has been widely studied and applied in recent two decades because of its advantages in achieving solids, organic matter and nutrient removal in a same reactor, higher pollutants loading, and reduced space requirement (González-Martínez et al, 2010;Bai et al, 2011;Abu Hasan et al, 2012;Li et al, 2013). However, due to aeration in conventional BAF, total nitrogen removal through biological way is difficult to achieve in a sole BAF column.…”

Enhanced synergistic denitrification and chemical precipitation in a modified BAF process by using Fe2+

“…Since it possesses a number of advantages, including achieving solids, organic matter, and nutrient removal in a same reactor, higher pollutants loading, and hence reduced space requirement, researches, and applications of BAF have grown with great popularity in recent years (Gilbert et al, 2008;Zhao et al, 2009;González-Martínez et al, 2010;Bai et al, 2011;Abu Hasan et al, 2012;Li et al, 2013). Because solids removal in BAF is achieved mainly through filtration, total suspended solids (TSS) in BAF influent is usually below 100 mg/L (Canler and Perret, 1994) to avoid filter bed clogging and associated frequent backwashing.…”

Nitrification of low concentration ammonia nitrogen using zeolite biological aerated filter (ZBAF)

“…In this study, a biological aerated filter (BAF) that is filled with zeolite media is used to treat wastewater with low concentrations of ammonium. Previous studies on BAFs improved the efficiency of organic-matter removal and nitrification [10][11][12][13][14][15][16][17][18][19]. When zeolite media was used in BAFs, nitrification occurred at high-influent conditions and showed high efficiency.…”

“…He et al [14] and Feng et al [17] reported that ZBAFs have more resistance than BAFs at lower water temperatures. Li et al [18] reported that modified zeolite more beneficial to the specific immobilization of AOB than natural zeolite, nitrite nitrogen accumulating was observed. Yang et al [19] enhanced the partial-nitrification efficiency through using ZBAFs.…”