Biochemical conversions and biomass morphology in a long-term operated SBR with aerobic granular sludge

Cydzik‐Kwiatkowska, Agnieszka; Wojnowska‐Baryła, Irena; Szatkowski, Marcin; Smoczyński, L.

doi:10.1080/19443994.2012.734695

Cited by 13 publications

(10 citation statements)

References 32 publications

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“…In a constantly aerated granular sludge reactor treating high-nitrogen wastewater, organics were stored in granules in the form of poly-β-hydroxybutyrate (Cydzik-Kwiatkowska et al 2012) and the storage of polyhydroxyalkanoates is favored by intermittent anoxic and aerobic conditions (Third et al 2003). It can be, therefore, supposed that some of the pulse-fed organics were accumulated in bacterial cells and served as carbon sources for the denitrification in the third non-aeration period and the final aerobic part of the GSBR cycle, which was indicated by the decrease in oxidized nitrogen forms.…”

Section: Discussionmentioning

confidence: 99%

Microbial structure and nitrogen compound conversions in aerobic granular sludge reactors with non-aeration phases and acetate pulse feeding

Cydzik‐Kwiatkowska

Rusanowska

Zielińska

et al. 2016

Environ Sci Pollut Res

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A technological system was developed for efficient nitrogen removal from real digester supernatant in a single reactor with shortened aeration to increase the economical aspects of wastewater treatment. The supernatant (600 mg TKN/L, low COD/N ratio of 2.2) was treated in batch reactors with aerobic granules (GSBRs) to test how one, two, or three non-aeration phases and acetate pulse feeding in the cycle affect the morphological and microbial properties of biomass. Introduction of one non-aeration phase in the cycle increased nitrogen removal efficiency by 11 % in comparison with constantly aerated GSBR. The additional non-aeration phases did not diminish the efficiency of ammonia oxidation but did favor nitrification to nitrate. Acetate pulse feeding in the reactor with three non-aeration phases raised the efficiency of nitrogen removal to 77 %; in parallel, the number of denitrifiers possessing nosZ genes and performing denitrification to N2 increased. Ammonia was oxidized by aerobic and anaerobic ammonia-oxidizing bacteria and heterotrophic nitrifiers (Pseudomonas sp. and Alcaligenes faecalis) that coexisted in granules. Azoarcus sp., Rhizobium sp., and Thauera sp. were core genera of denitrifiers in granules. An increase in the number of non-aeration phases diminished EPS content in the biomass and granule diameters and increased granule density.Electronic supplementary materialThe online version of this article (doi:10.1007/s11356-016-7709-7) contains supplementary material, which is available to authorized users.

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Section: Discussionmentioning

confidence: 99%

Microbial structure and nitrogen compound conversions in aerobic granular sludge reactors with non-aeration phases and acetate pulse feeding

Cydzik‐Kwiatkowska

Rusanowska

Zielińska

et al. 2016

Environ Sci Pollut Res

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“…(2016) [1][2][3][4][5][6][7][8][9] www.deswater.com doi: 10.1080/19443994.2016.1155177 quently a potential for a widening market to cut the high production cost [7].…”

Section: Desalination and Water Treatmentmentioning

confidence: 98%

“…In recent years, PHA accumulation with aerobic-activated sludge process has been reported by several researchers [8,9]. The feast and famine regimes are cultured under conditions of alternating excess and lack of external substrates give favorable conditions for micro-organisms capable of storing organic matter such as acetate, propionate, and lactic acids as PHA [10,11], so-called aerobic dynamic feeding (ADF).…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

Strategy to reduce the acclimation period for enrichment of PHA accumulating cultures

Guo

Chen

Wen

et al. 2016

Desalination and Water Treatment

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A B S T R A C TA selective sludge discharge (SSD) process is proposed and evaluated in this study to accumulate the polyhydroxyalkanoate (PHA) accumulating bacteria in mixed microbial cultures (MMCs). Sequencing batch reactor (SBR) PHA production in the SSD mode was compared to the conventional aerobic dynamic feeding (ADF) mode. Aerobic granular sludge rich in PHA was cultivated in a SBR by seeding the MMCs. The granular sludge was formed on 14 and 8 d of the operation in SBR #1 and SBR #2, respectively, however, the PHA production performance of SBR #1 fluctuated during the 30 d. The MMCs in SBR #2 showed the best PHA accumulating ability in terms of the yield of PHA, specific substrate uptake rate and PHA storage rate, a maximum PHA content and average PHA storage rate of 58.2% and 0.33 Cmol PHA/(Cmol X/h), respectively, were achieved on the day 30 of enrichment operation in the batch assays.

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“…This emerging environmental biotechnological process has been increasingly drawing the interest of researchers in the field of biological wastewater treatment [10][11][12]. According to studies conducted in the past decade, the biological treatment process using aerobic granular sludge systems is a promising technology for wastewater treatment because of its low space requirement, capacity to treat high loading rates, and ability to achieve simultaneous nutrient removal through nitrification, denitrification, and phosphorus removal [13][14][15]. When compared with the conventional biological treatment process, aerobic granules have strong microbial structure, excellent stability, and high biomass retention, which all contribute their resistance to toxic compounds [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Effect of Cr(VI) on the microbial activity of aerobic granular sludge

Zheng¹,

Wang²,

Chen³

et al. 2015

Desalination and Water Treatment

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Cao (2015): Effect of Cr(VI) on the microbial activity of aerobic granular sludge, Desalination and Water Treatment, A B S T R A C TThe effects of different chromium (Cr(VI)) concentrations (0, 5, 10, 25, and 50 mg/L) on pollutant removal, nitrification ability, and microbial activity of aerobic granular sludge in sequencing batch reactors were analyzed. When compared with the control system, Cr(VI) decreased the average chemical oxygen demand (COD) and ammonia nitrogen removal rates. Significant correlations between the inhibitory rate of specific ammonia utilization rate (sAUR) and Cr(VI) concentration suggested that sAUR inhibition rate could be an effective indicator to predict the biological nitrification process in the aerobic granular sludge system. Although appropriate Cr(VI) concentration stimulated electron transport system activity of the granules, more than 25 mg/L Cr(VI) obviously inhibited the activity. The total polysaccharide and protein contents of the extracellular polymeric substances (EPS) linearly increased with increasing Cr(VI) concentrations of up to 25 mg/L. Furthermore, Cr(VI) exhibited greater inhibitory effects on the nitrification process than on the organic substrate removal process. This may be owing to the lower tolerance of nitrifying bacteria to Cr(VI), when compared with that of organics-degrading heterotrophic bacteria; distribution of nitrifying and heterotrophic bacteria, which occurred at the outer and inner layers of the granular sludge, respectively; and improvement in the COD removal rate of the micro-organisms as a result of EPS secretion.

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Biochemical conversions and biomass morphology in a long-term operated SBR with aerobic granular sludge

Cited by 13 publications

References 32 publications

Microbial structure and nitrogen compound conversions in aerobic granular sludge reactors with non-aeration phases and acetate pulse feeding

Microbial structure and nitrogen compound conversions in aerobic granular sludge reactors with non-aeration phases and acetate pulse feeding

Strategy to reduce the acclimation period for enrichment of PHA accumulating cultures

Effect of Cr(VI) on the microbial activity of aerobic granular sludge

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