Feasibility of iron scraps for enhancing nitrification of domestic wastewater at low temperatures

Preparation and Characterization of Temperature/pH Dual-Responsive Gel Spheres for Immobilizing Nitro Bacteria

“…The reason may be that the gel slowed down the inhibition of microbial growth at low temperatures and provided a good living space for microorganisms, thus offering the possibility of effective degradation of ammonia nitrogen. 14,41,42 Overall, the effect of pH on the domesticated sludge and the optimum dual-response nitrifying bacteria gel spheres showed similar trends: NH 4 + −N removal rate increased and then decreased with increasing pH (Figure 7b). Due to the intrinsic characteristics of the nitrifying bacteria [optimum pH range for AOB and NOB (7.5−8.5), 43 the maximum NH 4 + −N removal rate (52.21%) was achieved at pH 8 for the domesticated sludge.…”

“…In contrast, the optimum dual-response nitrifying bacteria gel spheres showed superior denitrification performance at low temperatures (4 °C) with 31.07% removal of NH 4 + –N, 6.87% higher than the domesticated sludge. The reason may be that the gel slowed down the inhibition of microbial growth at low temperatures and provided a good living space for microorganisms, thus offering the possibility of effective degradation of ammonia nitrogen. ,, …”

Defense mechanism of Fe(III)-assisted anammox under salt stress: Performance and microbial community dynamics

“…(2022b) reported that Fe(III) was beneficial for EPS secretion, and iron-based particles could become “micro-nuclei” during granular sludge formation. Through the formation of iron hydroxides with high flocculation ability, granulation of anammox species could be induced ( Wang et al., 2021b ).…”