A systematic insight into a single-stage deammonification process operated in granular sludge reactor with high-loaded reject-water: characterization and quantification of microbiological community

Abstract In this paper, a multi-scale model is used to assess the multiple mineral precipitation potential in a full-scale anaerobic granular sludge system. Reactor behaviour is analysed under different operational conditions (addition/no addition of reject water from dewatering of lime-stabilized biomass) and periods of time (short/long term). Model predictions suggest that a higher contribution of reject water promotes the risk of intra-granule CaCO3 formation as a result of the increased quantity of calcium arriving with that stream combined with strong pH gradients within the biofilm. The distribution of these precipitates depends on: (i) reactor height; and (ii) granule size. The study also exposes the potential undesirable effects of the long-term addition of reject water (a decrease in energy recovery of 20% over a 100-day period), caused by loss in biomass activity (due to microbial displacement), and the reduced buffer capacity. This demonstrates how both short-term and long-term operational conditions may affect the formation of precipitates within anaerobic granules, and how it may influence methane production and consequently energy recovery.

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Corrigendum: Water Science and Technology 73 (9), 2085–2092: Determine the operational boundary of a pilot-scale-single-stage partial nitritation/anammox system with granular sludge, https://iwaponline.com/wst/article/73/9/2085/24780/Determine-the-operational-boundary-of-a-pilot?searchresult=1

Water Science & Technology ◽

10.2166/wst.2020.051 ◽

2019 ◽

Vol 80 (12) ◽

pp. 2430-2430

Author(s):

Yandong Yang ◽

Liang Zhang ◽

Xiaoyu Han ◽

Shujun Zhang ◽

Baikun Li ◽

...

Keyword(s):

Science And Technology ◽

Granular Sludge ◽

Pilot Scale ◽

Single Stage ◽

Partial Nitritation ◽

Water Science

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Comparison of control strategies for single-stage partial nitrification-anammox granular sludge reactor for mainstream sewage treatment—a model-based evaluation

Environmental Science and Pollution Research ◽

10.1007/s11356-017-0230-9 ◽

2017 ◽

Vol 24 (33) ◽

pp. 25839-25848 ◽

Cited By ~ 8

Author(s):

Jun Wu

Keyword(s):

Control Strategies ◽

Sewage Treatment ◽

Granular Sludge ◽

Single Stage ◽

Partial Nitrification ◽

Model Based ◽

Anammox Granular Sludge

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Partial nitrification of sludge reject water by means of aerobic granulation

Water Science & Technology ◽

10.2166/wst.2011.386 ◽

2011 ◽

Vol 64 (9) ◽

pp. 1906-1912 ◽

Cited By ~ 9

Author(s):

S. López-Palau ◽

A. Pericas ◽

J. Dosta ◽

J. Mata-Álvarez

Keyword(s):

Batch Reactor ◽

Granular Sludge ◽

Experimental Period ◽

Ammonium Nitrogen ◽

Partial Nitrification ◽

Average Value ◽

Reject Water ◽

Solids Concentration ◽

Granule Density ◽

Granule Morphology

Granular sludge formation was performed in a laboratory scale Sequencing Batch Reactor (SBR) fed with supernatant of anaerobic digestion of sewage sludge. This effluent was concentrated progressively in order to enhance biomass capacity without inhibiting it. During the first part of the study, ammonium nitrogen was converted to nitrate, so conventional nitrification took place. When a nitrogen load of 0.8 g N L−1 d−1 was treated, the effluent concentration of nitrite started to increase while the nitrate concentration decreased until it disappeared. So, partial nitrification was achieved. At the end of this study, a nitrogen load of 1.1 g N L−1 d−1 was treated obtaining an effluent with 50% ammonium and 50% nitrite. The volatile suspended solids concentration in the reactor reached 10 g VSS L−1. At this point the granule morphology was quite round and no filamentous bacteria was observed. The Feret's diameter was in the range between 1 and 6 mm with an average value of 4.5 mm. Roundness value was all the time higher than 0.7. Granule density increased during the experimental period, obtaining a final value of 7.0 g L−1.

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Biodegradation of Paracetamol by Aerobic Granules in a Sequencing Batch Reactor (SBR)

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.441.531 ◽

2012 ◽

Vol 441 ◽

pp. 531-535 ◽

Cited By ~ 6

Author(s):

Jun Hu ◽

Lan Zhou ◽

Qing Wei Zhou ◽

Fang Wei ◽

Li Li Zhang ◽

...

Keyword(s):

Degradation Rate ◽

Sequencing Batch Reactor ◽

Batch Reactor ◽

Substrate Inhibition ◽

Energy Resource ◽

Granular Sludge ◽

Aerobic Granules ◽

Dominant Form ◽

Start Up ◽

Insight Into

Aerobic granules efficient at degrading paracetamol as the sole carbon and energy resource were successfully developed in a sequencing batch reactor (SBR). Aerobic granules were first observed about 220 days after reactor start-up. The images SEM showed the aerobic granules typically consisted of coccus and bacillus. Meanwhile, the size distribution of aerobic granules was analyzed on day 200. The result indicated that the granules eventually grew to become the dominant form of biomass in the reactor. The granular sludge on day 80 and 200 degraded paracetamol completely in 48 h and 28 h, respectively, indicating that granulation contributed to paracetamol degradation. The specific paracetamol degradation rate was observed to increase with increasing paracetamol initial concentration from 500 to 5000 mg/L, peaked at 1200 mg-MTBE/g-VSS·h, and declined with further increases in MTBE concentration as substrate inhibition effects became significant. This study demonstrates that paracetamol can be effectively degraded by aerobic granules and gives insight into the microorganisms potentially involved in the process.

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