Nitrogen removal and biofilm structure affected by COD/NH4+–N in a biofilter with porous sludge-ceramsite

Zou, Jinlong; Xu, Guoren; Pan, Kai; Zhou, Wei; Dai, Ying; Wang, Xue; Zhang, Di; Hu, Yu‐Chen; Минг, Ма

doi:10.1016/j.seppur.2012.03.019

Cited by 67 publications

(31 citation statements)

References 31 publications

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“…The insufficient alkalinity of wastewater results in a decrease in pH, which inhibits the nitrifying microorganisms, mainly bacteria, of the second phase of nitrification since they are more sensitive to changes in pH [34]. A literature review showed that the expanded-clay aggregate used in the BAF (Biological Aerated Filter) system "buffered" changes in pH and redox potential [18], which is consistent with the results obtained in the present study, and the pH in all experiments was maintained at a constant level of 8.41-8.70. This level facilitated nitrification [19].…”

Section: Nitrification Efficiencymentioning

confidence: 99%

“…Rostron et al [17] noted that a reduction of the temperature from 25 • C to 16 • C decreased 10% of the nitrification efficiency in the reactor with biofilm, while the nitrification efficiency decreased 58% in the reactor with suspended biomass. Literature data also shows that the expanded-clay aggregate applied in biofilm reactors (biofilters) "buffers" changes in pH and redox potential [18,19]. Few studies have investigated the effect of temperature on denitrification which is temperature-dependent as a biochemical reaction [20].…”

Section: Introductionmentioning

confidence: 99%

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Effectiveness of Nitrification and Denitrification Processes in Biofilters Treating Wastewater from De-Icing Airport Runways

Rodziewicz

Ostrowska

Janczukowicz

et al. 2019

Water

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The basic factors determining the efficiency of the removal of nitrogen and carbon compounds from airport wastewater containing de-icing agents are low temperature and the C/N ratio (carbon to nitrogen ratio). Biofilm reactors (biofilters) create better conditions for nitrification and denitrification than suspended biomass reactors. The scope of the study included determination of the influence of the C/N ratio in the wastewater on nitrification, denitrification and organic compound removal in biofilm reactors depending on the temperature. The experiment was performed in 24 circular laboratory biofilters with LECA (Light Expanded Clay Aggregates) filling. The study was divided into three series differing in organic carbon loading. In each series, carried out at the same hydraulic retention time, biofilters were operated at 25, 8, 4 or 0 °C. The study showed the effective removal of nitrogen compounds across a very wide temperature range. The applied filling and properly selected operating parameters of the reactors resulted in effective simultaneous nitrification and denitrification. The highest efficiency of nitrogen removal at 0 °C (34.57 ± 4.54%) was obtained at the C/N ratio of 0.5 gC/gN. The efficiency of denitrification (the lowest at the temperature of 0 °C) increased as the temperature and C/N ratio increased in the wastewater.

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Section: Nitrification Efficiencymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effectiveness of Nitrification and Denitrification Processes in Biofilters Treating Wastewater from De-Icing Airport Runways

Rodziewicz

Ostrowska

Janczukowicz

et al. 2019

Water

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“…The porous ceramsite has well-developed porous structures and is propitious to develop many microbial communities. This may due to the fact that they determine the pollutants' mass transfer and the biological contact reaction occurring in the aqueous phases, liquid-solid boundary, and biofilm interior [16]. Therefore, porous ceramsite was chosen for microbiological immobilizing.…”

Section: Introductionmentioning

confidence: 99%

Performance and Microbial Community of Simultaneous Denitrification and Biomineralization in Bioreactors

Bai

Gao

et al. 2019

Chem Eng & Technol

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The effects of combined different strains on a simultaneous denitrification and biomineralization process were examined. The influence of sodium succinate concentration, pH, and hydraulic retention time on nitrate and hardness removal was evaluated in bioreactors. Experimental results indicated that high nitrate and hardness removal efficiencies were obtained under optimum conditions. The community diversity was markedly influenced by the concentration of sodium succinate. The findings proved that Pseudomonas sp. H117 and Pseudomonas sp. H2 played a key role in the process of nitrate and hardness removal. The main component of sedimentation generated from the bioreactor was detected as calcium ion precipitation by scanning electron microscopy and X-ray diffraction.

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“…Liu et al explored immobilized sorangium cellulosum on a diatomite-based porous ceramic [12]. The water-processing activity of microbes immobilized on porous inorganic materials has also been studied [13,14].…”

Section: Introduction mentioning

confidence: 99%

Preparation and Characterization of Fe2O3-CaO-SiO2 Porous Glass Ceramics for Bacteria Immobilization

Li¹,

Wang²,

Luo³

2017

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In this work we present a study of porous glass ceramics towards bacteria-immobilization applications for water filtration. Sol-gel synthesized glass samples were processed into Fe2O3-CaO-SiO2 porous glass ceramics by introducing a pore forming agent. The crystal phase composition, morphology, and pore structure of the ceramics were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), N2 adsorption-desorption measurements, and mercury intrusion porosimetry. By varying the pore forming agent and process conditions, varied pore size distributions are produced. The volume fraction of macropores is overall large while the volume fraction of meso-pores and micropores is overall comparably small. All samples display good biocompatability and compressive strength, making them suitable for bacteria immobilization. The macropore sizes were determined primarily by the size of pore forming agent, enabling control. The results provide a basis for optimizing the preparation of porous glass ceramics for bacteria immobilization.

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Nitrogen removal and biofilm structure affected by COD/NH4+–N in a biofilter with porous sludge-ceramsite

Cited by 67 publications

References 31 publications

Effectiveness of Nitrification and Denitrification Processes in Biofilters Treating Wastewater from De-Icing Airport Runways

Effectiveness of Nitrification and Denitrification Processes in Biofilters Treating Wastewater from De-Icing Airport Runways

Performance and Microbial Community of Simultaneous Denitrification and Biomineralization in Bioreactors

Preparation and Characterization of Fe2O3-CaO-SiO2 Porous Glass Ceramics for Bacteria Immobilization

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