Evaluation of Partial Nitritation/Anammox (PN/A) Process Performance and Microorganisms Community Composition under Different C/N Ratio

Abstract

A one-stage partial nitritation/anammox (PN/A) process with intermittent aeration is possible under sidestream conditions, but implementation in a mainstream is a challenge due to increased Carbon/Nitrogen (C/N) ratios in domestic wastewater. This study investigated the effect of C/N ratios on process efficiency and the effect of narrowing non-aeration time on process improvement at high chemical oxygen demand (COD) load. An increase in TN removal efficiency was achieved in both series with gradual change of C/N ratio from 1 to 3, from 65.1% to 83.4% and 63.5% to 78% in 1st and 2nd series, respectively. However, at the same time, the ammonium utilization rate (AUR) value decreased with the increase in C/N ratio. At a high COD (C/N = 3) concentration, the process broke down and regained productivity after narrowing the non-aeration time in both series. Shifts in the system performance were also connected to adaptive changes in microbial community revealed by data obtained from 16S rRNA NGS (next-generation sequencing), which showed intensive growth of the bacteria with dominant heterotrophic metabolism and the decreasing ratio of autotrophic bacteria. The study shows that deammonification is applicable to the mainstream provided that the C/N ratio and the aeration/non-aeration time are optimized.

Diving boldly into COVID‐19 contaminated wastewater: Eyes at nanotechnology‐assisted solutions

“…The critical aim of wastewater treatment is to eliminate organic matter and remove nutrients (S, N and P), suspended solids, and soluble contaminants from wastewater 104–108 . At all events, the wastewater treatment processes consist of the physical processes (primary treatment), biological processes (secondary treatment), flocculation sedimentation, sand filtration, and membrane filtration efficient as the physiochemical process (tertiary treatment) for pathogen removal from wastewater.…”

“…The critical aim of wastewater treatment is to eliminate organic matter and remove nutrients (S, N and P), suspended solids, and soluble contaminants from wastewater. [104][105][106][107][108] At all events, the wastewater treatment processes consist of the physical processes (primary treatment), biological processes (secondary treatment), flocculation sedimentation, sand filtration, and membrane filtration efficient as the physiochemical process (tertiary treatment) for pathogen removal from wastewater. Additionally, based on, 109 it is important to highlight that the approaches, all of which use sand filters for infection removal in the handwash-wastewater treatment of COVID-19, will become more efficient if the use of biological processes and/or physical filtration is made.…”

Recent advances in aqueous virus removal technologies

“…), soluble contaminants (metals, organic compounds, etc. ), suspended solids from wastewater and also can work as a virus removal methodology ( Al-Hazmi et al, 2019 , 2020 , 2021 ). It can be classified as conventional activity sludge (nitrification and denitrification) and anammox based-systems such as nitridation based-anammox and denitridation based-anammox ( Feng et al, 2017 ).…”

The Effect of Bioaugmentation Strategy on the SBR Performance Treating Reject Water and Municipal Wastewater under Various Temperature Conditions

“…The Effect of Bioaugmentation Strategy on the SBR Performance Treating Reject Water and Municipal Wastewater Under Various Temperature Conditions Aleksandra Szaja 1 , Joanna Szulżyk-Cieplak 2* nitrogen. Processes of nitrification and denitrification involve different groups of microorganisms and require different process conditions [Majtacz et al, 2017;Mehrani et The temperature is considered as a main parameter that can effect biological treatment [Metcalf and Eddy 2004].…”