Aerobic granulation in a sequencing batch reactor

Beun, J. J.; Hendriks, Alexander; Loosdrecht, M.C.M. van; Morgenroth, Eberhard; Wilderer, P.A.; Heijnen, Joseph J.

doi:10.1016/s0043-1354(98)00463-1

Cited by 686 publications

(432 citation statements)

References 7 publications

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“…The pH of the SBR was not adjusted and ranged between 7 and 8. Its height to diameter ratio was 12, which is relatively high to obtain high flow velocities, and facilitate the aerobic granule formation and selection [22]. At start-up, the airflow rate was 0.9 NL min -1 and increased to 2.5 NL min -1 after 42 d. This flow-rate was constant until the end of the experiment and was enough to maintain high shear-stress in the reactor, which is a key factor for granulation [23].…”

Section: Batch Tests With a Pnp Acclimated Sludgementioning

confidence: 99%

Aerobic biodegradation of a mixture of monosubstituted phenols in a sequencing batch reactor

Fernández

Suárez-Ojeda

Pérez

et al. 2013

Journal of Hazardous Materials

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Section: Batch Tests With a Pnp Acclimated Sludgementioning

confidence: 99%

Aerobic biodegradation of a mixture of monosubstituted phenols in a sequencing batch reactor

Fernández

Suárez-Ojeda

Pérez

et al. 2013

Journal of Hazardous Materials

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“…Oxidation at high OLR produced sufficient CO 2 to reduce pH in unbuffered solutions (McSwain et al, 2004a). Fungi grew well at low pH and may contribute significantly to the initial granulation (McSwain et al, 2004a;Beun et al, 1999;Williams and de los Reyes, 2006) since they could release protons in exchange for NH 4 + in the solution (Deacon, 2006), thereby further reducing the pH in the reactor. Yang et al (2008) noted that, aerobic granulation at pH 4.0 in the presence of a fungus produced a granule size of about 7 mm, while at pH 8.0 when the granulation was controlled by bacteria the granule size reached only 4.8 mm.…”

Section: Feed Compositionmentioning

confidence: 99%

“…Liu and Tay (2004) and Maximova and Dahl (2006) provided an up to date summary of the current understanding towards the bioaggregation processes. Granular sludge was first described for strictly anaerobic systems in 1980 (Lettinga et al, 1980) and only by the late 1990s had the formation and application of aerobic granules been reported (Morgenroth et al, 1997, Beun et al, 1999, Dangcong et al, 1999. The anaerobic granulation technology exhibited several drawbacks that included a long start-up period, a relatively high operating temperature, unsuitability for low strength organic wastewater, and low efficiency in the removal of nutrients (N and P) from wastewater.…”

Section: Introductionmentioning

confidence: 99%

“…Compact structured, biologically efficient aerobic sludge granules with wide diverse microbial species and excellent settling capabilities have been developed in sequencing batch reactors (SBR) (Morgenroth et al, 1997;Beun et al, 1999;Tay et al, 2001a;Yang et al, 2003;Tay, 2004, Adav et al, 2007a). Formation by self immobilization of bacteria as hypothesized by several researchers (Kim et al, 2004;McSwain et al, 2004a;Qin et al, 2004a,b;Wang et al, 2004;Hu et al, 2005;Liu et al, 2005), the aerobic granules were densely packed microbial aggregates and their densities were much higher than that of conventional activated sludge.…”

Section: Introductionmentioning

confidence: 99%

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Biotechnology advances

1998

Biotechnology Advances

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Aerobic granulation, a novel environmental biotechnological process, was increasingly drawing interest of researchers engaging in work in the area of biological wastewater treatment. Developed about one decade ago, it was exciting research work that explored beyond the limits of aerobic wastewater treatment such as treatment of high strength organic wastewaters, bioremediation of toxic aromatic pollutants including phenol, toluene, pyridine and textile dyes, removal of nitrogen, phosphate, sulphate and nuclear waste and adsorption of heavy metals. Despite this intensive research the mechanisms responsible for aerobic granulation and the strategy to expedite the formation of granular sludge, and effects of different operational and environmental factors have not yet been clearly described. This paper provides an up-to-date review on recent research development in aerobic biogranulation technology and applications in treating toxic industrial and municipal wastewaters. Factors affecting granulation, granule characterization, granulation hypotheses, effects of different operational parameters on aerobic granulation, response of aerobic granules to different environmental conditions, their applications in bioremediations, and possible future trends were delineated. The review attempts to shed light on the fundamental understanding in aerobic granulation by newly employed confocal laser scanning microscopic techniques and microscopic observations of granules.

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“…Under selection pressure, normally believed as settling time [1], [2] and exchange ratio [3]- [5], activated sludge could further aggregate and form compact granules with a certain size, dense structure, diverse microbial species, good settling ability and high tolerance to shock load and toxins. So far, aerobic granules have been proved effective in the treatment of wastewater with carbon, nutrients and many toxic materials.…”

Section: Introductionmentioning

confidence: 99%

Formation and Stability of Nitrifying Granules under High Loading Rates

Wang¹,

Chen²,

Nie³

et al. 2016

IPCBEE

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Abstract. Nitrifying granules are generally believed to have high nitrification ability due to the immobilization of large quantities of nitrifying bacteria with low growth rate. However, high loading rate is normally not recommended for nitrifying granules due to the high inhibition statue. In this study, nitrifying granules, able to treat ammonia nitrogen as high as 1000 mg N/L (2 kg N/m 3 ·d), were cultivated in the laboratory scale sequencing batch reactor. During around 200-day operation, the granules exhibited good performance with 99% ammonia removal efficiency. In the meantime, MLSS increased from initial 6 g/L to the final 10 g/L, and the value of SVI 30 decreased from around 100 to 15 ml/g. However, it was observed that the nitrifying granules gradually disintegrated into small aggregates with mean size decreased from 286 to 138 μm from the operation day 50 to 120, after which they gradually recovered by themselves with increased mean size of 235 μm at the end of the operation. Notably, this disintegration did not compromise performance and characteristics of the nitrifying granules. These results demonstrated that nitrifying granules may have the capability to undertake ammonia loading rates as high as 1000 mg N/L with good self-healing ability, which make the process more stable and promising in practice.

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Aerobic granulation in a sequencing batch reactor

Cited by 686 publications

References 7 publications

Aerobic biodegradation of a mixture of monosubstituted phenols in a sequencing batch reactor

Aerobic biodegradation of a mixture of monosubstituted phenols in a sequencing batch reactor

Biotechnology advances

Formation and Stability of Nitrifying Granules under High Loading Rates

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