Comparison of two different anaerobic feeding strategies to establish a stable aerobic granulated sludge bed

Rocktäschel, T.; Klarmann, C.; Ochoa, Juan; Boisson, P.; Sørensen, K.; Horn, Harald

doi:10.1016/j.watres.2013.08.014

Cited by 36 publications

(20 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Thus, this operation clearly differed from the plug flow strategy that was first described by de Kreuk and van Loosdrecht [7] and is frequently used in research nowadays [20,21,25]. It was reported earlier that a short feeding phase combined with anaerobic mixing achieved comparable results to anaerobic plug flow influent but that granule structure and stability was enhanced [27]. Additionally, the usage of an anaerobic mixed feeding allows an application of aerobic granules that is independently to the reactor geometry.…”

Section: Reactor Operationmentioning

confidence: 95%

See 1 more Smart Citation

Influence of the granulation grade on the concentration of suspended solids in the effluent of a pilot scale sequencing batch reactor operated with aerobic granular sludge

Rocktäschel¹,

Klarmann²,

Ochoa³

et al. 2015

Separation and Purification Technology

Self Cite

View full text Add to dashboard Cite

Section: Reactor Operationmentioning

confidence: 95%

“…A better COD uptake rate can be achieved if a fast influent followed by an anaerobic mixing phase instead of a plug flow operation is applied [27]. Conversely, this means a faster and more stable growth of aerobic granules as in applications shown so far [8,14] is possible.…”

Section: Nitrogen and Phosphorus Removalmentioning

confidence: 99%

Influence of the granulation grade on the concentration of suspended solids in the effluent of a pilot scale sequencing batch reactor operated with aerobic granular sludge

Rocktäschel¹,

Klarmann²,

Ochoa³

et al. 2015

Separation and Purification Technology

Self Cite

View full text Add to dashboard Cite

“…The results showed that reasonable organic loading rate, high H/D ratio, sequencing batch operation and settling time still could be necessary factors. A recent study showed that an intensive anaerobic contact of granules and easily degradable organic carbon at the beginning of each SBR cycle stabilize granular growth, phosphorus and nitrogen removal [17]. …”

Section: Introductionmentioning

confidence: 99%

Aerobic Sludge Granulation in a Full-Scale Sequencing Batch Reactor

Ding

Cai

et al. 2014

BioMed Research International

View full text Add to dashboard Cite

Aerobic granulation of activated sludge was successfully achieved in a full-scale sequencing batch reactor (SBR) with 50,000 m3 d−1 for treating a town's wastewater. After operation for 337 days, in this full-scale SBR, aerobic granules with an average SVI30 of 47.1 mL g−1, diameter of 0.5 mm, and settling velocity of 42 m h−1 were obtained. Compared to an anaerobic/oxic plug flow (A/O) reactor and an oxidation ditch (OD) being operated in this wastewater treatment plant, the sludge from full-scale SBR has more compact structure and excellent settling ability. Denaturing gradient gel electrophoresis (DGGE) analysis indicated that Flavobacterium sp., uncultured beta proteobacterium, uncultured Aquabacterium sp., and uncultured Leptothrix sp. were just dominant in SBR, whereas uncultured bacteroidetes were only found in A/O and OD. Three kinds of sludge had a high content of protein in extracellular polymeric substances (EPS). X-ray fluorescence (XRF) analysis revealed that metal ions and some inorganics from raw wastewater precipitated in sludge acted as core to enhance granulation. Raw wastewater characteristics had a positive effect on the granule formation, but the SBR mode operating with periodic feast-famine, shorter settling time, and no return sludge pump played a crucial role in aerobic sludge granulation.

show abstract

“…A post anaerobic mixed batch phase can in addition be implemented as safety measure to polish the anaerobic treatment before aeration (Lochmatter and Holliger, 2014;Rockt€ aschel et al, 2013;Weissbrodt et al, 2013a). A post anaerobic mixed batch phase can in addition be implemented as safety measure to polish the anaerobic treatment before aeration (Lochmatter and Holliger, 2014;Rockt€ aschel et al, 2013;Weissbrodt et al, 2013a).…”

Section: Model Integration In Ebpr Granular Sludge Research and Practicementioning

confidence: 99%

“…Mechanisms of PAO/GAO selection are similar in activated sludge and granular sludge systems (Weissbrodt et al, 2013b). Granular sludge SBRs engineered for EBPR are operated by alternating phases of slow up-flow feeding across the settled bed of biomass under anaerobic conditions-i.e., commonly called "anaerobic feeding"-and of aeration batch phases (de Kreuk and van Loosdrecht, 2004;Rockt€ aschel et al, 2013). Control of loading conditions and anaerobic phase length is crucial to establish an efficient anaerobic selector.…”

Section: Introductionmentioning

confidence: 99%

Modeling hydraulic transport and anaerobic uptake by PAOs and GAOs during wastewater feeding in EBPR granular sludge reactors

Weissbrodt

Holliger

Morgenroth

2017

Biotech & Bioengineering

View full text Add to dashboard Cite

New-generation bioprocesses using granular sludge aim for a high-rate removal of nutrients from wastewater with low footprint. Achieving enhanced biological phosphorus removal (EBPR) relies on the design of sludge beds and wastewater feeding conditions to optimally load the biomass and to select for polyphosphate- (PAOs) over glycogen-accumulating organisms (GAOs) and over other heterotrophs. A hydraulic-metabolic mathematical model was developed to elucidate the impact of hydraulic transport patterns and environmental conditions on the PAO/GAO competition during up-flow feeding through an EBPR granular sludge bed. Tracer experiments highlighted plug-flow regimes with dispersion under both rapid (9 m h , Re = 1.6, Pe = 7.2, Pe = 4.6) and slow (0.9 m h , Re = 0.2, Pe = 21.3, Pe = 3.4) feeding. Non-turbulent regimes (Re << 10 ) promote a safe implementation of simultaneous fill/draw. Feeding time, pH, and temperature significantly impacted bacterial competition for carbon uptake under anaerobic slow feeding. Feeding duration should be designed to avoid full depletion of intracellular storage polymers within static granules. PAOs bear twice longer feeding than GAOs by using both polyphosphate and glycogen hydrolysis to sustain anaerobic C-uptake. Alkaline conditions (pH 7.25-8.0) by, e.g., dosing lime in the feed select for PAOs independently of temperature (10-30°C). A twice higher bed is required for full anaerobic conversions at 10 rather than 20°C. Biosystem responses for anaerobic C-uptake can be anticipated using the model toward designing robust anaerobic selectors to manage the microbial resource in EBPR granular sludge. Biotechnol. Bioeng. 2017;114: 1688-1702. © 2017 Wiley Periodicals, Inc.

show abstract

Comparison of two different anaerobic feeding strategies to establish a stable aerobic granulated sludge bed

Cited by 36 publications

References 32 publications

Influence of the granulation grade on the concentration of suspended solids in the effluent of a pilot scale sequencing batch reactor operated with aerobic granular sludge

Influence of the granulation grade on the concentration of suspended solids in the effluent of a pilot scale sequencing batch reactor operated with aerobic granular sludge

Aerobic Sludge Granulation in a Full-Scale Sequencing Batch Reactor

Modeling hydraulic transport and anaerobic uptake by PAOs and GAOs during wastewater feeding in EBPR granular sludge reactors

Contact Info

Product

Resources

About