Extracellular polymeric substances (EPS) of microbial aggregates in biological wastewater treatment systems: A review

Sheng, Guo‐Ping; Yu, Han‐Qing; Li, Xiaoyan

doi:10.1016/j.biotechadv.2010.08.001

Cited by 2,552 publications

(981 citation statements)

References 160 publications

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“…These findings demonstrate that, with the low NO 2 -/FNA (e.g., 5 mg NO 2 --N/L), microbial activities were still higher in the floc sludge than in the granular sludge; however, after the NO 2 -/FNA ratio increased to a certain level (e.g., 10 mg NO 2 --N /L in the present study), the granular sludge system exhibited a stronger tolerance to the inhibitor (i.e., nitrite/FNA). This observation is consistent with former studies, and confirms that biogranulation technologies are able to withstand high-strength wastewater and shock loadings, and are tolerant to toxicity [6,7].…”

Section: Comparison Of the Denitrifying P Removal Efficiencysupporting

confidence: 92%

“…Previous studies have shown that operational conditions such as high aeration intensities, short settling times, high volume exchange ratios, and toxic substances are favorable for EPS production and granule formation [6]. In the present study, the high EPS production in G-SBR may be due to the stressful culture conditions, including the high shear forces (in Period II) and FNA accumulation (mainly in adaptation Period I) ( Fig.…”

Section: Physical Properties and Eps Composition Of The Flocculent Anmentioning

confidence: 50%

“…S2), while in F-SBR the mean diameter was 0.2 mm (Table 1). This indicates that the increase in the shear force rate caused larger granules to form in G-SBR [6,7].…”

Section: Physical Properties and Eps Composition Of The Flocculent Anmentioning

confidence: 91%

“…It has been successfully formed in sequencing batch reactors (SBRs) designed for denitrifying P removal [1,5]. There are many advantages associated with the use of biogranulation technologies in wastewater treatment, including high biomass retention, strong microbial structures, the ability to withstand high-strength wastewater, shock loadings, and also a high tolerance to toxicity [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…If DPAOs are enriched in granular sludge, it is thought that the constraints of the accumulated nitrite or FNA might be eliminated, primarily owing to (i) the dense distribution of biomass at the outer layer of the granular sludge, and (ii) the thicker, extracellular polymeric substance (EPS) matrix that is built up by biofilm cells, which means that granules are more resistant to hazardous materials (e.g., nitrite /FNA) [6]. These unique structural and bio-chemical properties of granular sludge protect the functional organisms from the harsh external environment, and hence help maintain efficient nutrient removal and the stability of the processes.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of performance, microorganism populations, and bio-physiochemical properties of granular and flocculent sludge from denitrifying phosphorus removal reactors

Wang

Jiang

Hong

et al. 2015

Chemical Engineering Journal

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Comparison of performance, microorganism populations, and bio-physiochemical properties of granular and flocculent sludge from denitrifying phosphorus removal reactors, Chemical Engineering Journal (2014), doi: http://dx.doi.org/10.1016/j.cej. 2014.09.065 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. ABSTRACT:Granule formation frequently occurs in denitrifying phosphorus (P) removal systems.The differences between granules and flocculants, including P removal capacities, bio-physiochemical properties, and microorganism distribution and diversity, are however still poorly understood. Physical and biochemical characteristics of granules and sludge flocs were investigated through two laboratory-scale sequencing batch reactors (SBRs). One reactor was operated as a flocculent SBR and the other 2 was operated as a granular SBR, using a granule diameter of 1.92 ± 0.78 mm. Granular sludge had a higher tolerance to inhibitors (nitrite/free nitrite acids (FNAs)), and a higher percentage of P accumulating organisms (PAOs) (72 % vs. 64 % in flocs) than flocculent sludge. The granule crush tests and higher PAOII (unable to use nitrate as an electron acceptor) to PAOs ratios (over 72 %) by fluorescent in situ hybridization showed that in both reactors, glycogen accumulating organisms (GAOs) were mainly responsible for nitrate to nitrite reduction, and PAOII further reduced nitrite to nitrogen gas in association with anoxic P uptake; GAOs wash-out weakened the mutual relationship between GAOs and PAOII to some extent, which made denitrification of nitrate to nitrite inefficient and weakened subsequent anoxic P removal. GAOs existed mainly on the surface of the granules, whereas PAOs (PAOI+PAOII ) were distributed both on the surface and in the interior of the granules. Thus, GAOs had easier access to carbon sources but were at risk of suffering from exposure to FNA.

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Section: Comparison Of the Denitrifying P Removal Efficiencysupporting

confidence: 92%

Section: Physical Properties and Eps Composition Of The Flocculent Anmentioning

confidence: 50%

“…S2), while in F-SBR the mean diameter was 0.2 mm (Table 1). This indicates that the increase in the shear force rate caused larger granules to form in G-SBR [6,7].…”

Section: Physical Properties and Eps Composition Of The Flocculent Anmentioning

confidence: 91%