Biomass segregation between biofilm and flocs improves the control of nitrite-oxidizing bacteria in mainstream partial nitritation and anammox processes

Laureni, Michele; Weissbrodt, David G.; Villez, Kris; Robin, Orlane; Jonge, Nadieh de; Rosenthal, Alex; Wells, George F.; Nielsen, Jeppe Lund; Morgenroth, Eberhard; Joss, Adriano

doi:10.1016/j.watres.2018.12.051

Cited by 218 publications

(115 citation statements)

References 44 publications

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“…Similarly, increasing the fraction of floc wastage to 1.7 % results in a similar HRT, but in tandem with DO reduction, increases HRT to approximately 20 hours. The effect of Anammox activity on HRT is minor, as was observed in the original study (see Scenario 4 in [16]).…”

Section: Resultsmentioning

confidence: 67%

“…The branch-point was continued both in forward and backward directions to obtain the smooth branch-point curves indicated. We confine the extent of the parameter variation to approximately those given in the original empirical work [16]. The figures are also marked with the points representing the parameter values investigated by Laureni et al [16], with the third (fixed) operating parameter set to its default value when not used as a bifurcation parameter.…”

Section: Resultsmentioning

confidence: 99%

“…We confine the extent of the parameter variation to approximately those given in the original empirical work [16]. The figures are also marked with the points representing the parameter values investigated by Laureni et al [16], with the third (fixed) operating parameter set to its default value when not used as a bifurcation parameter. The single black marker indicates default operation where AOB and NOB coexist, whilst the white markers are the represent a change in one control parameter that facilitates NOB washout.…”

Section: Resultsmentioning

confidence: 99%

“…The objective of the study by Laureni et al [16], to understand the qualitative behaviour of the competing nitrifiers under differential operating conditions, is underpinned by identification of the ideal operating scenario for complete NOB washout. These are predicated on the model assumptions above, particularly Items ii -iv.…”

Section: Performance Metricsmentioning

confidence: 99%

“…Recently, attempts have been made to model the PN/A process in hybrid systems (mixed floc/granule and attached biofilms) [9,16], indicating that process performance is highly sensitive to process design (e.g. degree of flocculation and segregation) and operation (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Bifurcation analysis of an impulsive system describing Partial Nitritation and Anammox in a hybrid reactor

Wade

Wolkowicz

2020

Preprint

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Low-energy deammonification under mainstream conditions is a technology that has received significant attention in recent years as the water industry drives towards long-term sustainability goals. Simultaneous partial nitritation-Anammox (PN/A) is one process that can provide substantial energy reduction and lower sludge yields. Mathematical modelling of such a process offers engineers insights into the conditions for maximising the potential of PN/A. Laureni et al., Water Res. (2019) have recently published a reduced mechanistic model of the process in a sequencing batch reactor, which indicates the effect of three key operating parameters (Anammox biofilm activity, dissolved oxygen concentration and fraction of solids wasted) on performance. The analysis of the model is limited, however, to simulation with relatively few discrete parameter sets. Here, we demonstrate through the use of bifurcation theory applied to an impulsive system, that a phase space can be generated describing the continuous separation of system equilibria. Mapping process performance data onto these spaces allows engineers to target suitable operating regimes for specific objectives. Here, for example, we note that the nitrogen removal efficiency is maximised close to the trans-critical bifurcation curve denoting nitrite oxidising bacteria washout, but control of solids washout and Anammox biofilm activity can also reduce oxygen requirements whilst maintaining an appropriate Hydraulic Retention Time. The approach taken is significant given the possibility for using such a methodology for models of increasing complexity, which will enable engineers to probe the entire parameter space of systems of higher dimensionality and realism in a consistent manner.

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Section: Resultsmentioning

confidence: 67%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Performance Metricsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bifurcation analysis of an impulsive system describing Partial Nitritation and Anammox in a hybrid reactor

Wade

Wolkowicz

2020

Preprint

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Quorum sensing unveils the sludge floccule‐assisted stabilization of aerobic granules in granule‐dominated sequencing batch reactors

Tian

et al. 2022

Biotech & Bioengineering

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Floccules are another major form of microbial aggregates in aerobic granular sludge systems. Previous studies mainly attributed the persistence of floccules to their relatively faster nutrient uptake and higher growth rate over aerobic granules; however, they failed to unravel the underlying mechanism of the long-term coexistence of these two aggregates. In this work, the existence and function of the floccules in an aerobic granule-dominated sequencing batch reactor were investigated from the view of quorum sensing (QS) and quorum quenching (QQ).The results showed that though the floccules were closely associated with the granules in terms of similar community structures (including the QS-and QQ-related ones), they exhibited a relatively higher QQ-related activity but a lower QS-related activity. A compatible proportion of floccules might be helpful to maintain the QS-related activity and keep the granules stable. In addition, the structure difference was demonstrated to diversify the QS-and QQ-related activities of the floccules and the aerobic granules. These findings could broaden our understanding of the interactions between the coexistent floccules and granules in aerobic granuledominated systems and would be instructive for the development of the aerobic granular sludge process.

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Zeolite biofilm aeration filter plays a pre‐nitritation role in autotrophic nitrogen removal from iron oxide red wastewater

Feng

Wang

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND: The completely autotrophic nitrogen removal over nitrite (CANON) system has excellent performance in treating ammonium-rich wastewater and it depends on ammonia oxidizing bacteria (AOB) working together with anammox bacteria in a reactor. Higher ammonium nitrogen loading requires higher aeration to provide sufficient dissolved oxygen (DO) for nitritation, whereas high-strength aeration in theCANON will destroy the sludge structure and inhibit the activity of anammox bacteria. The present study uses a stable pre-nitritation system to reduce a part of nitritation and also decrease aeration intensity in the CANON. RESULTS: Continuous aeration to maintain the DO concentration between 1.5 and 4.3 mg L-1 in the CANON achieved a stable nitrogen removal rate (1.22 kg N m-3 d-1) from iron oxide red wastewater with 400-1016 mg N L-1 after 183 days of operation. Using a mixed alkalinity donor [sodium carbonate (Na 2 CO 3) and bicarbonate (NaHCO 3)] in the combined system can save ≈14.1-28.2% of the alkalinity cost compared with using NaHCO 3 only. CONCLUSIONS: A zeolite biofilm aeration filter (ZBAF) used in a pre-nitritation process can tolerate high DO concentration of ≤6.5 mg L-1 for nitritation and avoid all of the nitritation taking place in the CANON system. This can protect the sludge structure and anammox bacteria from high-strength aeration erosion.

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Biomass segregation between biofilm and flocs improves the control of nitrite-oxidizing bacteria in mainstream partial nitritation and anammox processes

Cited by 218 publications

References 44 publications

Bifurcation analysis of an impulsive system describing Partial Nitritation and Anammox in a hybrid reactor

Bifurcation analysis of an impulsive system describing Partial Nitritation and Anammox in a hybrid reactor

Quorum sensing unveils the sludge floccule‐assisted stabilization of aerobic granules in granule‐dominated sequencing batch reactors

Zeolite biofilm aeration filter plays a pre‐nitritation role in autotrophic nitrogen removal from iron oxide red wastewater

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