Aerobic granulation for nitrogen removal via nitrite in a sequencing batch reactor and the emission of nitrous oxide

Use low direct current electric field to augment nitrification and structural stability of aerobic granular sludge when treating low COD/NH4-N wastewater

“…When the influent NH 4 -N concentration was further increased to 400 or 500 mg/L as scheduled, greater than 72% of influent NH 4 -N was converted to NO 2 -N in Rc, which could be attributed to the inhibition of NOB by FA. This nitrite accumulation phenomenon agrees with the finding of Shi et al (2011) who reported that about 64% of influent NH 4 -N could be transformed into NO 2 -N when influent NH 4 -N increased to 350 mg/L. On the other hand, about 75% of the influent NH 4 -N was converted to NO 3 -N with little nitrite accumulation in Re till the end of experiment (influent NH 4 -N = 500 mg/L).…”

Aerobic granules formation and simultaneous nitrogen and phosphorus removal treating high strength ammonia wastewater in sequencing batch reactor

“…However, TN removal efficiency achieved high removal efficiency (89.8%) under the DO concentration of 2.32-4.94 mg/L in the mixed liquor in this study. One possible reason could be attributed to the penetration depth of oxygen caused denitrification inside of granular sludge, which was consistent with the conclusion reported by Shi et al (2011). Correspondingly, the pH value Table 3 The detailed fluorescence spectra parameters of the sludge EPS samples.…”

Treatment of oil sands process-affected water using moving bed biofilm reactors: With and without ozone pretreatment

“…The volume ratio of OSPW was initially 10%, increasing step-wise to 100% (Table 1). Extra carbon (sodium acetate, 200 mg/L COD) as well as nitrogen (ammonium chloride, 30 mg N/L), phosphorus (monopotassium phosphate, 3 mg P/L) and other necessary nutrients (Shi et al, 2011) were provided to maintain the growth of bacteria in the systems. All chemicals and supplies were obtained from Thermo Fisher Scientific.…”