Effect of nitrifiers community on fouling mitigation and nitrification efficiency in a membrane bioreactor

By Arsalan Sepehri, M. Sarrafzadeh. Chemical Engineering and Processing, 2018

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Abstract Membrane fouling in membrane bioreactors (MBR) normally depends on the microbial cell density and microbial population structure. A nitrifying-enriched activated sludge (NAS) was obtained in this study through particular ammonium feeding of conventional activated sludge (CAS). Next, the dominance of autotrophic nitrifier population in NAS system was checked and compared with CAS system by its high nitrification efficiency (100% vs. 43%) and low COD removal (9% vs. 65%). Furthermore, the maximum amount of N-NO3− produced from similar concentrations of ammonium in CAS and NAS systems were 6.6 mg/L and 37.5 mg/L, respectively. A filterability test also was done in the cross-flow and simple dead-end filtration systems proportionally employing different amount of NAS and CAS with a constant MLSS concentration of 2000 mg/L. NAS was twice as filterable compared to CAS. Soluble microbial products (SMP) and extracellular polymeric substance (EPS) in CAS were significantly higher than NAS system (2 and 6 mg/L for NAS vs.100 and 36 mg/L for CAS). By increasing the proportion of nitrifying bacteria, the permeation was enhanced remarkably about 2.5 folds and the operation time of MBR was approximately doubled (6–11.5 h). The results indicated that an appropriate C/N ratio can control the microbial population and help the nitrifier significantly mitigate fouling in MBR.

Subfields: Biomedical Engineering, Pollution, Water Science and Technology

View Paper: https://www.semanticscholar.org/paper/f46fc43fa6b8350b6892c19a047a67c7db06e865

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Citations in the corpus

• Activated carbon preparation from biomass feedstock: Clean production and carbon dioxide adsorption (2019, background): “, 2019) and nitrifier enriched activated sludge (Sepehri and Sarrafzadeh, 2018) can capture CO2 under varying conditions.”
• A review of microencapsulated and composite phase change materials: Alteration of strength and thermal properties of cement-based materials (2019, background): “This phase change process occurs only https://doi.org/10.1016/j.rser.2019.04.072 Received 21 November 2018; Received in revised form 19 April 2019; Accepted 24 April 2019 Abbreviations: PCM, Phase change materials; CO2, Carbon dioxide; CCS, carbon dioxide capture and storage; OECD, Organization for ”