Nutrients removal and nitrous oxide emission during simultaneous nitrification, denitrification, and phosphorus removal process: effect of iron

Abstract

The short- and long-term influences of ferric iron (Fe(III)) on nutrients removal and nitrous oxide (N2O) emission during SNDPR process were evaluated. According to the continuous cycle experiments, it was concluded that the addition of Fe(III) could lower the nitrogen removal of the following cycle during SNDPR process, which was mainly induced by the chemical removal of phosphorus. However, the impacts were transitory, and simultaneous nitrogen and phosphorus removal would recover from the inhibition of Fe(III) after running certain cycles. Moreover, the addition of Fe(III) could stimulate N2O emission transitorily during SNDPR process. However, if Fe(III) was added into reactor continuously, the nitrogen removal would be improved, especially at low Fe load condition. It was because that the activity of NO reductase was enhanced by the addition of Fe. However, the low Fe load in reactor would induce more N2O emission. When Fe(III) load was 40 mg/L in the reactor, the N2O yield was 10 % higher than control. The TN removal was weakened when Fe(III) load reached to 60 mg/L, and the N2O yield was lower than control, due to the inhibition of the high Fe load on denitrification enzymes.

Oxidation Ditches for Recycling and Reusing Wastewater Are Critical for Long-Term Sustainability—A Case Study

“…The NH 3 removal occurs theoretically via three mechanisms: gaseous NH 3 stripping to the atmosphere, NH 3 assimilation in microbe biomass, and biological nitrification. From the results, it can be noticed that there is limited fluctuation in nitrate concentration, as recorded in Figure 5 in the final effluent; this indicates that nitrification has limited presentation [33]. The nitrification process is accomplished by two groups of nitrifying bacteria Nitrosomonas and Nitrobacter [33].…”

“…From the results, it can be noticed that there is limited fluctuation in nitrate concentration, as recorded in Figure 5 in the final effluent; this indicates that nitrification has limited presentation [33]. The nitrification process is accomplished by two groups of nitrifying bacteria Nitrosomonas and Nitrobacter [33].…”

Exploring the impact of hyper-quantity on the performance to access GHG emission in a full-scale A 2 O+MBR process: From predictions to implementation

“…It is noticed that the e uent TP concentration was signi cantly higher when P removal agent was added compared to the scenarios without their addition, indicating the negative effect of these agents on e uent NH 3 -N concentration (Fig. 3 (g)) (Jia et al 2016). Meanwhile, the concentration of e uent TP exceeded the standard considerably, when the P removal agent was not enhanced at the same multiple as the treated quantity.…”

Effect of Fe3+ on the nutrient removal performance and microbial community in a biofilm system

“… Wang et al (2014) have examined the effect of Fe 3+ on nitrogen (N) removal performance in a modified biological aerated filter, showing that nitrification performance was enhanced in the presence of Fe 3+ , whereas denitrification performance was inhibited. Furthermore, Jia et al (2016) have demonstrated that the use of acetate as a carbon source in a laboratory-scale sequencing batch reactor contributed to promoting total nitrogen (TN) removal at an Fe 3+ concentration of 40 mg/L. In contrast, in a batch reactor with citrate as the carbon source, 17.7 mg/L Fe 3+ was found to suppress the overall denitrification process ( Ramírez et al, 2018 ).…”