Pilot scale experiment with MBR operated in intermittent aeration condition: Analysis of biological performance

An innovative respirometric method to assess the autotrophic active fraction: Application to an alternate oxic–anoxic MBR pilot plant

“…Table 1 reports the main features of each cycle as well as the main characteristics of the feeding wastewater and the operating conditions of the MBR pilot plant (average values). For further details on the experimental campaign, analytical procedures and biological performances, the reader is referred to the literature [7].…”

“…However, it is important to stress that the results of the present study were likely affected by the low organic loading rates. This condition, which results in a low F/M ratio, leads to slow oxygen depletion in the bioreactor; therefore, aerobic conditions were also maintained during a portion of the non-aerated phase [7]. Thus, under these peculiar operating conditions, the absence of aeration is not a stress condition for the heterotrophic biomass metabolism, and the effect of the alternate cycle on the kinetic parameters of heterotrophic species cannot be properly verified.…”

“…The AC processes allow the removal of biological organic matter and nutrients in a single reactor by alternating in time the reactions that occur in different in-series reactors in the BNR traditional systems (University of Cape Town -UCT, Modified University of Cape Town -MUCT, Bardenpho) [6]. Therefore, AC processes may represent a suitable and effective strategy to save energy and improve the nutrient removal efficiency [7].…”

CFD simulation and optimization of membrane scouring and nitrogen removal for an airlift external circulation membrane bioreactor

“…Volumetric oxygen transfer rate (OTR) coefficient, k L a, is usually used for the description of oxygen source (Cockx et al, 2001). It is affected by many factors, such as configuration of bioreactor, surface tension, viscosity, temperature, and most importantly, the aeration condition including aeration intensity (Pittoors et al, 2014), aeration pattern (Capodici et al, 2015), bubble diameter and bubble shape (De Temmerman et al, 2015) and hydrodynamics (Braak et al, 2011). More than that, k L a is affected by the solution composition, biomass concentration and sludge rheological property in wastewater treatment systems (Pittoors et al, 2014).…”

The role of EPS in the foaming and fouling for a MBR operated in intermittent aeration conditions

“…Furthermore, foaming occurrence can be encouraged by the implementation of new management strategies such as the Intermittent Aeration (IA). Although such process can offer several advantages [14,15], the intermittent aeration impact on microorganisms can result in a proliferation of foam-forming microorganisms such as filamentous bacteria. In details, the IA process consists of alternating aerobic and anoxic phases within the same stirred reactor.…”