Operation mode and external carbon dose as determining factors in elemental composition and morphology of aerobic granules

Cydzik‐Kwiatkowska, Agnieszka; Rusanowska, Paulina; Głowacka, Katarzyna

doi:10.1515/aep-2016-0009

Cited by 8 publications

(4 citation statements)

References 22 publications

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“…Ca-rich granules have higher mechanical strength but lower bioactivity, so the calcium ion content of aerobic granules is one of the factors determining their bioactivity. The granulation time and stimulation of cell-to-cell aggregation can be reduced by calcium-induced dehydration of bacterial cell surfaces [ 43 , 44 , 45 ]. In the present study, the concentration of calcium ions in the raw wastewater was 0.27 mmol Ca/L.…”

Section: Resultsmentioning

confidence: 99%

Powdered Ceramsite and Powdered Limestone Use in Aerobic Granular Sludge Technology

et al. 2020

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The effects of two powdered mineral materials (powdered ceramsite and powdered limestone) on aerobic granulation of sludge were evaluated. The experiment was conducted on a laboratory scale bioreactors treating wastewater for 89 days. Three granular sequencing batch reactors (GSBRs) were operated at the lowest optimal organic loading rate (OLR) of 2.55 g COD/(L∙d). In the control reactor (R1), the mean diameter (d) of the biomass ranged from 124.0 to 210.0 µm, and complete granulation was not achieved. However, complete granulation did occur in reactors to which either ceramsite (251.9 µm < d < 783.1 µm) or limestone (246.0 µm < d < 518.9 µm) was added. Both powdered materials served as a ballast for the sludge flocs making up the seed sludge. Ceramsite particles also acted as microcarriers of granule-forming biomass. The granules in the reactors with added powdered materials had nonfibrous and smoother surfaces. The reactor with ceramsite exhibited the highest average efficiencies for COD, total nitrogen, and total phosphorus removal (85.4 ± 5.4%, 56.6 ± 10.2%, and 56.8 ± 9.9%, respectively). By contrast, the average nitrification efficiency was 95.1 ± 12.8%.

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Section: Resultsmentioning

confidence: 99%

Powdered Ceramsite and Powdered Limestone Use in Aerobic Granular Sludge Technology

et al. 2020

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“…The content of calcium ions is a factor determining the aerobic bioactivity of granules, given the way these ions can induce dehydration at the surface of bacterial cells. This stimulates the aggregation of microorganisms and shortens the biogranulation time [42,48]. In the research presented here, the concentration of the calcium cation in raw wastewater was 0.27 mmol Ca/L.…”

Section: Biological Properties Of Biomassmentioning

confidence: 87%

“…In the reactors with PK and PL, the Ca/P ratio was below 1. Cydzik-Kwiatkowska et al [42] reported that the dose of the external carbon source is a decisive factor affecting the elemental composition of biomass. The granules cultured at a dose of 540 mg COD/(L•cycle) had a higher percentage by weight of C, S and N, which indicated the presence of greater amounts of organic compounds in the structure of the granular sludge.…”

Section: Selected Chemical Properties Of Biomassmentioning

confidence: 99%

The Impact of Different Powdered Mineral Materials on Selected Properties of Aerobic Granular Sludge

et al. 2020

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This study aimed to evaluate and compare the physical, chemical and biological properties of aerobic granular sludge from reactors with the addition of different powdered mineral materials. These properties have a significant impact on the efficiency of systems in which the biomass in granular form is used. Four identical granular sequencing batch reactors (GSBRs) were adopted for the research performed on a laboratory scale (R1—control reactor; R2, R3 and R4—with materials, PK, PG and PL respectively). The results indicate that the addition of powdered mineral materials improved the properties of biomass in reactors. The SVI5/SVI30 ratio values were significantly lower in the reactors with added materials (approx. 1.3 ± 0.3). The mean values of the sludge volume index at 30 min were the lowest in the R2 (39.8 ± 8.6 mL/g) and R4 (32.8 ± 10.7 mL/g) reactors. The settling velocity of biomass was the highest in the R2 reactor (15.4 ± 6.1 m/h). In the early days of the study, the highest extracellular polymeric substances (EPS) content was found in the biomass from the reactors to which the materials with higher Ca and Mg content were added (380.18–598.30 mg/g MLVSS). The rate of specific oxygen uptake (SOUR) by biomass indicated an insufficient biomass content in the R1 reactor—to 7.85 mg O2/(g MLVSS∙h)—while in the reactors with materials, the SOUR values were at the higher levels.

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“…The dried samples were gold coated in an argon atmosphere using an ion coater (Fine Coater, JCF-1200, JEOL, Akishima, Japan). The samples were imaged using an SEM (JSM-5310LV, JEOL, Akishima, Japan) at 15 kV [39].…”

Section: Methodsmentioning

confidence: 99%

Increasing the Biogas Potential of Rapeseed Straw Using Pulsed Electric Field Pre-Treatment

Szwarc

Głowacka

2021

Energies

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Due to the high availability of lignocellulosic biomass, which can be obtained from terrestrial plants, agricultural waste biomass, and the agro-food, paper or wood industries, its use for energy production by methane fermentation is economically and environmentally justified. However, due to their complex structures, lignocellulosic substrates have a low conversion factor to biogas. Therefore, scientists are still working on the development of new methods of the pre-treatment of lignocellulosic materials that will increase the biogas productivity from lignocellulosic biomass. The presented research focuses on the use of a pulsed electric field (PEF) to disintegrate rapeseed straw prior to the methane fermentation process. Scanning electron microscopy observation showed that, in the disintegrated sample, the extent of damage to the plant tissue was more severe than in the control sample. In the sample disintegrated for 7 min, the chemical oxygen demand increased from 4146 ± 75 mg/L to 4920 ± 60 mg/L. The best result was achieved with a 5-min PEF pre-treatment. The methane production reached 290.8 ± 12.1 NmL CH4/g VS, and the biogas production was 478.0 ± 27.5 NmL/g VS; it was 14% and 15% higher, respectively, compared to the control sample.

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Operation mode and external carbon dose as determining factors in elemental composition and morphology of aerobic granules

Cited by 8 publications

References 22 publications

Powdered Ceramsite and Powdered Limestone Use in Aerobic Granular Sludge Technology

Powdered Ceramsite and Powdered Limestone Use in Aerobic Granular Sludge Technology

The Impact of Different Powdered Mineral Materials on Selected Properties of Aerobic Granular Sludge

Increasing the Biogas Potential of Rapeseed Straw Using Pulsed Electric Field Pre-Treatment

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