Nitrogen and phosphorus removal efficiency and algae viability in an immobilized algae and bacteria symbiosis system with pink luminescent filler

Abstract

In this study, an immobilized algae and bacteria symbiotic biofilm reactor (ABSBR) with pink luminescent filler (PLF) was constructed. The effects of PLF addition in the construction of an algae and bacteria symbiotic biofilm system on the nitrogen and phosphorus removal efficiencies and algae viability were evaluated. Our results showed that for influent TN and TP concentrations of 40 ± 5 and 5 ± 0.8 mg/L, respectively, the pollutant removal rates (PRRs) of TN and TP by the ABSBR can reach up to 74.74 and 88.36%, respectively. The chlorophyll-a (chl-a) concentration on the PLF reaches approximately 5,500 μg/L with a specific oxygen generation rate (SOGR) of 65.48 μmolO2 mg−1Chl-a h−1. These results indicate that the adding PLF into algae and bacteria symbiosis systems can effectively improve the nitrogen and phosphorus removal efficiencies of the sewage as well as increase biomass and viability of the algae in the system.

Poly(vinyl alcohol)/modified porous starch gel beads for microbial preservation and reactivation: preparation, characterization and its wastewater treatment performance

“…In addition, the increase of total pore volume can increase the microorganisms that can be accommodated in the PVA–MPS gel beads, and it has been shown that the increase of specific surface area can improve the performance of activated sludge biological nitrification and denitrification of the gel beads. 28…”

“…The large proliferation of microorganisms in the early activation period consumed TIN by assimilation, where the TIN removal efficiency of even cycles (light reaction cycle) was higher than that of odd cycles (dark reaction cycle), suggesting that the presence of algae is essential to increase the nitrogen removal efficiency. 28 Whereas, the mid-activation phase made the denitrification of the system weaker due to the prolonged aeration of the reactors. Interestingly, the TIN removal efficiencies of R3 and R4 were higher than those of R1 and R2 at the early activation phase, which may be due to the higher preservation temperature, which resulted in higher microbial metabolism, and the more active gel beads had better TIN removal performance at the early phase.…”

“…The large proliferation of microorganisms in the early activation period consumed TIN by assimilation, where the TIN removal efficiency of even cycles (light reaction cycle) was higher than that of odd cycles (dark reaction cycle), suggesting that the presence of algae is essential to increase the nitrogen removal efficiency. 28 Whereas, the mid- © 2023 The Author(s). Published by the Royal Society of Chemistry activation phase made the denitrication of the system weaker due to the prolonged aeration of the reactors.…”