A simple way to improve a conventional A/O-MBR for high simultaneous carbon and nutrient removal from synthetic municipal wastewater

Abstract

In this study, two anoxic-oxic membrane bioreactor (A/O-MBR) systems, i.e. conventional and biofilm anoxic-oxic-membrane bioreactors (C-A/O-MBR and BF-A/O-MBR, respectively), were operated in parallel under conditions of complete sludge retention for the purposes of comparing system performance and microbial community composition. Moreover, with the microbial communities, comparisons were made between the adhesive stage and the suspended stage. High average removal of COD, NH4+-N and TN was achieved in both systems. However, TP removal efficiency was remarkably higher in BF-A/O-MBR when compared with C-A/O-MBR. TP mass balance analysis suggested that under complete sludge retention, polyurethane sponges that were added into the anoxic tank played a key role in both phosphorus release and accumulation. The qPCR analysis showed that sponge biomass could maintain a higher level of abundance of total bacteria than the suspended sludge. Meanwhile, AOB and denitrifiers were enriched in the suspended sludge but not in the sponge biomass. Results of illumina sequencing reveal that the compacted sponge in BF-A/O-MBR could promote the growth of bacteria involved in nutrient removal and reduce the amount of filamentous and bacterial growth that is related to membrane fouling in the suspended sludge.

Modeling, simulation and control of biological and chemical P-removal processes for membrane bioreactors (MBRs) from lab to full-scale applications: State of the art

“…biological interactions in relation with their population dynamics and thus improving the EBPR modeling (Al-Atar, 2007;Hauduc et al, 2015). Some experimental studies have investigated that the EPS/SMP play a positive role in BioP-removal (Adoonsook et al, 2019;Ichihashi et al, 2006;Jiang et al, 2009;Zhang et al, 2013) while the current ASMs do not consider this phenomenon. It is therefore proposed to undertake full-scale studies to rule out the difference in lab-scale to fullscale models' applications.…”

Ammonium and Phosphate Recovery from Biogas Slurry: Multivariate Statistical Analysis Approach

“…P uptake was correlated with P concentration in the media, with more rapid uptake at higher initial concentrations [82,83]. The results show that the correlation coefficient values between ammonium and phosphates were found to be 0.96 and 0.98, respectively, which indicated the impact of the positive correlation with phosphate and ammonium levels [84].…”

Purification of polluted surface water by sponge moving bed membrane bioreactor with short hydraulic retention time operation

“…Li et al (2019) reported that suspended growth biomass played an essential role in nitrification in moving bed biofilm reactor and SND enhanced TN removal. Adoonsook et al (2019) also described the beneficial effect of complete sludge retention to achieve high nitrification. Meanwhile, the presence of sponge and attached growth biomass helped to promote denitrification and TN removal.…”